MEMORANDUM FINDINGS OF FACT AND OPINION

VASQUEZ, JUDGE: Respondent determined the following deficiencies in, additions to, and penalties on petitioner's Federal income taxes:

All section references are to the Internal Revenue Code in effect for the years in issue. All Rule references are to the Tax Court Rules of Practice and Procedure.

Petitioner, an attorney, maintained a personal injury law practice in the Koreatown section of Los Angeles. Respondent contends, among other things, that petitioner received and cashed over 160 checks throughout the years in issue, failed to report the income from these checks, and fraudulently and with the intent to evade taxes understated his income from his law practice for the years in issue. Petitioner contends that he never received the proceeds from these checks. Rather, he argues that his 1997 Tax Ct. Memo LEXIS 639">*640 office manager, who had effective control of the law office, cashed the checks, paid the clients and the medical providers, and kept any remaining amounts without petitioner's knowledge.

After concessions, the issues for decision are: ^{11997 Tax Ct. Memo LEXIS 639">*641}

(1) Whether petitioner failed to report income from his law practice in 1988, 1989, 1990, and 1991 in the amounts of $14,074, $68,648, $238,665, and $57,708, respectively; ²

(2) whether petitioner failed to timely file his Federal income tax returns for the 1989 and 1991 tax years;

(3) whether petitioner is liable for an addition to tax for fraud pursuant to section 6653(b) for the 1988 tax year; and

(4) whether petitioner is liable for penalties for fraud pursuant to section 6663 for the 1989, 1990, and 1991 tax years.

Finally, if we decide that petitioner did not fraudulently fail to report income, we must decide whether petitioner substantially omitted gross income in 1989 and 1990 so as to render section 6501(e) applicable, and, if not, whether the 1997 Tax Ct. Memo LEXIS 639">*642 limitations periods for assessing taxes for those years have expired.

FINDINGS OF FACT

Some of the facts have been stipulated and are so found. The stipulations of facts and attached exhibits are incorporated herein by this reference. Petitioner resided in North Hollywood, California, at the time he filed his petition.

PETITIONER'S LAW PRACTICE

Petitioner is an attorney. He was admitted to practice in California in 1978. From 1979 through 1981, he worked with another attorney in Van Nuys, California. Petitioner became a sole practitioner in 1982. His first office was in Encino, California, and in 1983, he moved to Woodland Hills, California. He kept this office open through 1991. He had no employees at either location. Petitioner handled some personal injury cases in the Encino office but did not have a negotiator. At the Woodland Hills location, petitioner sublet an office from another attorney and shared secretarial services. During 1988 and 1989, petitioner had very few clients at the Woodland Hills office, and during 1990 and 1991, he had no clients at that office.

Petitioner met Won Koo Yoon, a.k.a. Philip Yoon (hereinafter Mr. Yoon), in 1987. At that time, Mr. Yoon was working in 1997 Tax Ct. Memo LEXIS 639">*643 a travel agency preparing immigration filings predominantly for Korean clients. Mr. Yoon had attended school in Korea and immigrated to the United States as a young adult. Mr. Yoon did not have a law degree, and he never worked in a law firm before meeting petitioner.

Mr. Yoon suggested that petitioner open an office in Koreatown and that Mr. Yoon could help petitioner develop a client base in the Korean community. In early 1987, petitioner opened a law office on 7th Street in Koreatown in Los Angeles. Petitioner moved to Koreatown because he believed that the move would broaden the base of his practice in the Korean-American community. Petitioner, Mr. Yoon, and some part-time help worked at the 7th Street location. During this time, petitioner's practice consisted of immigration filings, default divorce, minor criminal matters, and a few personal injury cases. Mr. Yoon would make initial contacts with clients, obtain information from them, and act as translator.

Approximately 6 months later, in 1987, petitioner moved his practice to 3200 Wilshire Boulevard in Koreatown in Los Angeles. At the 3200 Wilshire Boulevard location, petitioner and Mr. Yoon had separate offices.

Petitioner's 1997 Tax Ct. Memo LEXIS 639">*644 association with Mr. Yoon proved fruitful, and an increasing portion of petitioner's practice was devoted to personal injury matters. By 1989, petitioner was handling only occasional minor criminal matters and immigration filings. Petitioner did not have a negotiator at any of his offices in 1988.

In April or May of 1989, petitioner moved his office to 3700 Wilshire Boulevard. His office is still located there. During that time, one of Mr. Yoon's duties was to secure clients for the firm; he was very successful at this task. By 1989, petitioner's practice had expanded to a volume of more than 200 personal injury cases in the office at any point. A negotiator was hired to deal with insurance companies. The ethnic makeup of petitioner's clientele had changed to the point that approximately 80 to 90 percent of petitioner's clients were Koreans, most of whom did not speak English. Since petitioner did not speak Korean, he was forced to rely on Mr. Yoon and employees in the office to communicate with clients. The reported gross receipts on petitioner's Schedule C grew as follows during the years in issue:

Mr. 1997 Tax Ct. Memo LEXIS 639">*645 Yoon departed the firm in 1993.

It was at Mr. Yoon's suggestion and coaxing that petitioner decided to open an office in Koreatown and to develop a client base in the Korean community. From the outset, Mr. Yoon assumed a major role in the office. Mr. Yoon would make initial contacts with clients, obtain information, act as translator, and prepare much of the paperwork relating to the client's matter. Mr. Yoon's compensation in the initial stages of his arrangement with petitioner was sporadic and based on the availability of funds in the office.

Mr. Yoon was active in securing clients for the firm. Mr. Yoon would locate the client, secure the client's signature on the retainer agreement, initiate contact with the insurance company, arrange for the client to obtain medical treatment, handle the processing of the insurance claim, prepare a list to monitor the period of limitations, review and process the mail, manage the office, make disbursements to clients, and hire, fire, and supervise employees. Petitioner also was involved in some of these activities.

Petitioner's primary role was to concentrate on litigation matters. After a negotiator was hired, petitioner's 1997 Tax Ct. Memo LEXIS 639">*646 time increasingly was absorbed with the handling of litigation matters. Petitioner had very little involvement with a case prior to litigation. Petitioner often did not have any contact with clients or decide which clients the firm would represent. Petitioner relied on Mr. Yoon and other persons in the office to pursue the administrative processing of insurance claims. When cases went smoothly, petitioner typically had virtually no involvement with them.

The vast majority of petitioner's cases were non-English- speaking Korean clients, many of whom had the same last names. As a result, petitioner could not distinguish the various cases in the office.

REPORT OF R. GERALD MARKLE

At trial, petitioner presented R. Gerald Markle as an expert on industry practices involving the relationships between lawyers and law firm administrators. Before entering private practice, Mr. Markle worked for the Office of Trial Counsel of the State Bar of California from 1979 through 1986. While with the Office of Trial Counsel, Mr. Markle prosecuted over 100 formal disciplinary proceedings against California attorneys, and as a private practitioner he has defended over 200 attorneys in legal malpractice matters 1997 Tax Ct. Memo LEXIS 639">*647 and formal disciplinary proceedings. Mr. Markle's expert report was submitted as his direct testimony.

In offices with a primarily Asian clientele, an Asian administrator, who frequently controls access to the client base, often becomes, in effect, the principal, while the lawyer is the administrator's employee. Mr. Yoon's dominance over the operation of petitioner's law practice, therefore, is consistent with common practice in personal injury law offices in the Los Angeles area that have primarily an Asian clientele.

PETITIONER'S OFFICE PROCEDURES

The majority of cases handled by petitioner's law firm during 1988 through 1991 involved personal injury claims. Clients came to the firm through print and television advertisements aimed primarily at the Korean community and through the efforts of Mr. Yoon. Prospective clients executed retainer agreements with the "Law Offices of Robert T. Schirle". Occasionally, petitioner was present when the client signed the retainer agreement; other times Mr. Yoon or another member of the law office, or a combination thereof, was present. A client file was established after the client signed the retainer agreement. An investigation was made, and police 1997 Tax Ct. Memo LEXIS 639">*648 reports, medical records, or other documents relating to the injury were assembled. Mr. Yoon would prepare a list of cases with the date of the injury for the purpose of monitoring the 1-year period of limitations within which to commence litigation. A representation letter was then forwarded from the firm to the insurance company to notify the insurance company of the claim. Mr. Yoon then referred the client to a medical provider for diagnosis and/or treatment. Mr. Yoon monitored and assessed the progress of the medical treatment and any property damages, and the corresponding reports were forwarded to the insurance companies. Contact was then made with the insurance adjuster in an attempt to resolve the claim. In 1988, this was done by petitioner, and from 1989 through 1991, this was done by a negotiator employed by the firm. If the negotiator reached an acceptable settlement, the settlement draft was received and a release was prepared for the client to execute. If a property damage reimbursement check was received, the entire amount of the check was forwarded to the person entitled to the amount. If a medical payment check was received, the client's signature was obtained, and 1997 Tax Ct. Memo LEXIS 639">*649 the amount was deposited and held in the firm's client trust account until there was a final resolution of the claim. If a bodily injury settlement check was received, it was associated with the file along with billing statements from the medical provider. A disbursement statement was prepared identifying the amount due to the client, to the firm for fees and costs, and to the medical provider. The client was brought into the office to execute the insurance settlement check for deposit into the firm's client trust account. The client's portion of the settlement proceeds was distributed to the client by check or in cash. If the medical provider's bill was for more than one-third of the settlement, contact was made to obtain the provider's agreement to accept only the one-third amount. If the 1- year anniversary of the accident was approaching and/or if there was no apparent ability to settle the claim, cases were reviewed for possible litigation. If necessary, petitioner prepared and filed a complaint.

RECORDING OF FEE INCOME AND PREPARATION OF TAX RETURNS

By 1988, the income to petitioner's law practice consisted primarily of insurance settlement checks from personal injury cases. There 1997 Tax Ct. Memo LEXIS 639">*650 were three major categories of insurance settlement checks: Property damage, medical payment (med-pay), and bodily injury. For property damage settlements, the check typically was deposited into the firm's client trust account, and the proper amount then was disbursed to the body shop or the client. On occasion, a check simply was endorsed over to the body shop or the client. Med-pay checks often were received in advance of the final resolution of the insurance claim. Accordingly, these checks typically were deposited into petitioner's client trust account and were held for a considerable length of time to determine whether the client ultimately was entitled to keep the med-pay amount. The firm earned no fee on med-pay amounts until it was determined that the amount constituted part of the overall recovery of the client in the case and was not reimbursable. The office policy was for bodily injury settlement checks to be held until they were signed by the client. Then the amounts were deposited into the firm's client trust account, and a check was issued to the client for the client's portion. At some point, the amount due to the medical provider then was paid. This policy was not followed 1997 Tax Ct. Memo LEXIS 639">*651 with respect to the cashed checks at issue in this case.

It was petitioner's policy not to cash insurance checks. There were a few exceptions in 1988 and early 1989 where Mr. Yoon was authorized to cash a check to pay a client who would have had difficulty negotiating the firm's check to the client. Mr. Yoon cashed such checks with the understanding that the balance would be retained by Mr. Yoon as part of his compensation. It was petitioner's understanding that even in the isolated instances in which a check was authorized to be cashed, Mr. Yoon recorded the cashed checks for the purpose of maintaining accurate books for the firm. Petitioner believed that even if these amounts were not reported in the firm's gross income, there was no change to the firm's net income because any amount that inured to the benefit of the firm was kept by Mr. Yoon as compensation.

Mr. Park prepared petitioner's Federal income tax returns for 1988, 1989, and 1990. Mr. Hwang prepared petitioner's Federal income tax return and amended return for 1991. Both Mr. Park and Mr. Hwang, petitioner's accountants for the years in issue, were recommended by Mr. Yoon. The deposits into the client trust account were included 1997 Tax Ct. Memo LEXIS 639">*652 in the general ledger as receipts of the firm.

Petitioner's 1988, 1989, and 1990 Federal income tax returns were all filed more than 3, but less than 6, years prior to respondent's mailing of the notice of deficiency on July 7, 1995. Petitioner's 1991 Federal income tax return was filed on October 15, 1992.

THE 162 DISPUTED CHECKS ³

Petitioner was aware that some of the 162 disputed checks came into his law firm. Petitioner did not personally cash settlement checks. Mr. Yoon frequently paid cash to clients of the firm. Mr. Yoon specifically instructed the firm's employees who witnessed these cash payments not to tell petitioner that cash disbursements to clients were being made. In 1988 and early 1989, petitioner authorized Mr. Yoon to cash occasional settlement checks. This policy (to petitioner's knowledge) stopped in 1989 because the office moved 1997 Tax Ct. Memo LEXIS 639">*653 to a building in which one of the firm's banks was located, facilitating immediate payment or cash availability from insurance settlement checks. Petitioner authorized Mr. Yoon to take any remaining proceeds from the authorized checks as salary. The following table sets forth the checks which petitioner authorized Mr. Yoon to cash:

There were two additional checks for which petitioner doubted the authenticity of his signature, but other circumstances indicated that it was the kind of check which petitioner would have authorized Mr. Yoon to cash, keeping the firm's net proceeds as compensation. These checks are as follows:

Items 18 through 101 and 104 through 164 were not signed by petitioner but were endorsed by a signature stamp of petitioner's name. Petitioner never authorized the endorsement of any check by signature stamp.

THE MITSUI MANUFACTURERS BANK CLIENT TRUST ACCOUNT

Petitioner had a client trust account at Mitsui Manufacturers Bank from November 30, 1987, through December 1997 Tax Ct. Memo LEXIS 639">*654 31, 1991. Initially, petitioner did not provide copies to his tax preparers of the 1988 through 1991 bank statements for this account, although he provided the 1991 statements to Mr. Hwang in late 1992. None of the deposits into this account were reflected on petitioner's 1988, 1989, 1990, and 1991 Federal income tax returns. In 1991, petitioner endorsed and deposited insurance settlement checks into his Mitsui Manufacturers Bank client trust account. The gross amounts of these checks are as follows:

Petitioner also deposited $3,000 in cash to this account on March 1, 1989. These amounts also form part of respondent's adjustment to petitioner's Schedule C gross receipts.

PETITIONER'S ASSETS

During the years in issue, petitioner reported the following net income from his law practice:

During these same years, petitioner's approximate living expenses were as follows:

Petitioner 1997 Tax Ct. Memo LEXIS 639">*655 lived in an apartment in a commercial building owned by his parents throughout the years in issue. Petitioner did not own any real estate or stock. Petitioner did not have a gambling habit, a drug or alcohol problem, or any expensive hobbies. Petitioner did not make any charitable contributions or have any significant investments or purchases.

Mr. Yoon had two bank accounts at CaliforniaKorea Bank and one account at Security Pacific Bank which had the following total deposits:

Petitioner had Mr. Richard Rose, an accountant, prepare a summary of Mr. Yoon's bank accounts. The net amount of deposits was determined after an analysis was made by Mr. Rose to eliminate transfers between accounts, credit memos, transfers from credit cards, and redeposited checks which would normally constitute nontaxable transfers. Mr. Yoon also made a $100,000 downpayment on the purchase of a house in October 1990, spent $17,180 on improvements to the residence made in 1991 and paid for in early 1992, and at various times during the years in issue drove an Acura Legend, a Range Rover, and a Lexus. Mrs. Yoon worked 1997 Tax Ct. Memo LEXIS 639">*656 for a clothing manufacturer in 1988 through 1989, after which time she gave birth and was not employed. When petitioner first became associated with Mr. Yoon, Mr. Yoon had an old automobile and no appearance of affluence. Mrs. Yoon's parents also appeared to be of modest means. By February 1993, Mr. Yoon had begun taking steps to relocate to Washington State. After petitioner discovered the cashed checks in 1993, he directed the office staff to open mail and provide it directly to him and not to Mr. Yoon.

YEAREND LEDGER ADJUSTMENTS

Most of the information necessary to complete petitioner's returns was provided to the accountants by Mr. Yoon. Petitioner was aware of a problem created by using the deposits in the client trust accounts as a starting point for the firm's gross receipts; i.e., the method overstated income by including amounts that did not belong to the firm. There was no problem to the extent that a settlement check was received and the payments to the client and medical provider were made in the same year. The problem arose with respect to amounts collected but unreimbursed until the following year. At various times, it could take as long as 5 months to pay medical providers 1997 Tax Ct. Memo LEXIS 639">*657 on bodily injury settlements. An estimate was made to determine the amount of the funds held in the client trust accounts at yearend which did not belong to the firm, and this amount was backed out in determining the gross receipts on petitioner's Schedule C. The accrual entry is the amount that petitioner backed out of gross income each year to reflect amounts that he believed did not reflect income.

The following table compares the amount of petitioner's "accrual entry" to the yearend balance in petitioner's client trust accounts for each year in which respondent has proposed an adjustment:

Petitioner did not review in detail each year's Schedule C prepared by the accountants but rather focused on the gross receipts and net income to determine whether the amount seemed reasonable on the basis of his recollection of the previous year and the amount of income which petitioner 1997 Tax Ct. Memo LEXIS 639">*658 was able to receive from the firm.

OPINION

Respondent based his determination of a deficiency in petitioner's 1988 Federal income tax entirely on five disputed insurance checks. After adjustments, the deficiencies for 1989, 1990, and 1991 are net amounts representing (1) one-third of the gross receipts from the remainder of the 162 disputed insurance checks, (2) respondent's reversal of petitioner's yearend ledger adjustments, which petitioner claims identify amounts in his client trust account which were not taxable receipts, and (3) insurance settlement checks deposited into the Mitsui client trust account in 1991 and a $3,000 cash deposit into that same account in 1989.

UNREPORTED INCOME

Respondent, on the basis of the 162 cashed checks made out to petitioner's law firm, determined that petitioner had unreported income for each of the years in issue.

The Commissioner's determinations are entitled to a presumption of correctness. Rule 142(a); . The burden is upon the taxpayer to demonstrate in the first instance that the Commissioner's determination is arbitrary and unreasonable in order to deprive it of the presumption of correctness. .

With 1997 Tax Ct. Memo LEXIS 639">*659 respect to the years in issue, respondent presented ample evidence linking petitioner to the income from the settlement checks. Respondent offered checks made payable to petitioner's law firm which were purportedly endorsed by petitioner. An income tax deficiency based on petitioner's failure to report as income one- third of those checks has a rational foundation. Therefore, the notice of deficiency is entitled to a presumption of correctness, and petitioner bears the burden of proving that no part of the checks is includable in his gross income.

Petitioner disputes respondent's income computation from the settlement checks. He contends that he could not have earned substantially more than he reported on his returns throughout the years in issue. In support of his position, petitioner points out that he had no asset accumulation or spending which would suggest he had income greater than he reported. Petitioner established that his lifestyle was far from extravagant. See . Petitioner's call to "Show me the money" goes unanswered by respondent. Furthermore, petitioner's explanation of where the money went is supported by Mr. Markle's report 1997 Tax Ct. Memo LEXIS 639">*660 and Mr. Yoon's significant accumulation of assets.

Petitioner relies heavily on his own testimony. Respondent frequently reminds this Court that we are not obligated to accept as true the uncorroborated testimony of petitioner. See , affd. ; , revg. . Petitioner's testimony, however, generally was credible, and we rely on petitioner's testimony as it was supported by the record. See (basing analysis upon evaluation of the entire record and the credibility of witnesses); see also .

In the instant case, respondent relies on the settlement checks which were made out to petitioner's law firm. The evidence in the record indicating where the proceeds from those checks went supports petitioner's explanation that, with certain exceptions, ⁴ Mr. Yoon converted the proceeds to his own use without petitioner's knowledge. We conclude, therefore, that the settlement checks cashed without petitioner's knowledge did not constitute income to petitioner 1997 Tax Ct. Memo LEXIS 639">*661 within the meaning of section 61. Cf. .

THE MITSUI MANUFACTURERS BANK CLIENT TRUST ACCOUNT

Respondent contends that one-third of the gross amounts of the deposits into the Mitsui account (except for checks totaling $17,500) represent taxable gross receipts of petitioner's law practice for the 1991 taxable year. Petitioner admits, on brief, that he omitted this income from checks that were deposited into the Mitsui account.

YEAREND LEDGER ADJUSTMENTS

Respondent determined that petitioner's yearend adjustments to his general ledger were incorrect. Petitioner contends that these adjustments were appropriate to account for amounts held in his client trust account at the Sumitomo Bank which did not constitute income to petitioner. Petitioner 1997 Tax Ct. Memo LEXIS 639">*662 contends that substantial med-pay balances existed in the client trust account in each of the years at issue.

Petitioner bears the burden of proving that these adjustments are appropriate. Rule 142(a). Petitioner relies on his own testimony that there were substantial amounts of funds in the general ledger which belonged to medical providers and doctors which support the adjustments. Petitioner claims that these adjusting entries are fully supportable in concept and amount. We disagree. In concept, petitioner is correct that not all of the funds in this account constitute income. Petitioner's adjustments excluded 96.8 percent, 84.1 percent, and 91.5 percent of the yearend client trust account balances in 1989, 1990, and 1991, respectively. Petitioner, however, has failed to prove that more than two-thirds of the yearend balances did not constitute income. To the extent petitioner's yearend adjustments exceed two-thirds of the yearend balances, we sustain respondent's determination. ^{51997 Tax Ct. Memo LEXIS 639">*663}

FRAUD

The addition to tax or penalty in the case of fraud is a civil sanction provided primarily as a safeguard for the protection of the revenue and to reimburse the Government for the heavy expense of investigation and the loss resulting from a taxpayer's fraud. . Respondent has the burden of proving, by clear and convincing evidence, an underpayment for each year and that some part of the underpayment was due to fraud. Sec. 7454(a); Rule 142(b). To satisfy his burden of proof, respondent must show two things: (1) An underpayment exists; and (2) the taxpayer intended to evade taxes known to be owing by conduct intended to conceal, mislead, or otherwise prevent the collection of taxes. . The mere failure to report income, however, is not sufficient to establish fraud. . If respondent establishes that any portion of the underpayment is attributable to fraud, the entire underpayment is treated as attributable to fraud and subjected to an addition to tax or penalty, except with respect to any portion 1997 Tax Ct. Memo LEXIS 639">*664 of the underpayment that the taxpayer establishes is not attributable to fraud. Sec. 6653(b)(2) for 1988; sec. 6663(b) for 1989 through 1991.

Fraud is intentional wrongdoing on the part of the taxpayer with the specific purpose to evade a tax believed to be owing. , affd. . The existence of fraud is a question of fact to be resolved from the entire record. , affd. without published opinion . Respondent must meet his burden through affirmative evidence because fraud is never imputed or presumed. . A taxpayer's entire course of conduct can be indicative of fraud. ; . Furthermore, a taxpayer's fraudulent original return is not purged by the filing of a subsequent amended return. .

Respondent did not assert fraud with respect to any part of the underpayments which we have found for 1990. We have already concluded that petitioner 1997 Tax Ct. Memo LEXIS 639">*665 underpaid his taxes in the 1988, 1989, and 1991 tax years due in part to unreported income from deposits into the Mitsui account and unsubstantiated wage deductions for amounts paid to Mr. Yoon. ⁶ We must now determine whether petitioner had the requisite fraudulent intent with regard to these underpayments in 1989 and 1991.

Next, respondent must prove that a portion of each underpayment for 1989 and 1991 was due to fraud. . The existence of fraud is a question of fact to be resolved upon consideration of the entire record. , affd. . Fraud is never presumed but, rather, must be established by affirmative evidence. , 1997 Tax Ct. Memo LEXIS 639">*666 affg. . Fraud may be proved by circumstantial evidence because direct proof of the taxpayer's intent is rarely available. The taxpayer's entire course of conduct may establish the requisite fraudulent intent. .

Over the years, courts have developed a nonexclusive list of factors that demonstrate fraudulent intent. These badges of fraud include: (1) Understating income, (2) maintaining inadequate records, (3) failing to file tax returns, (4) implausible or inconsistent explanations of behavior, (5) concealment of income or assets, (6) failing to cooperate with tax authorities, (7) engaging in illegal activities, (8) an intent to mislead which may be inferred from a pattern of conduct, (9) lack of credibility of the taxpayer's testimony, (10) filing false documents, and (11) dealing in cash. See ; ; , affg. ; . Although no single factor is necessarily sufficient to establish fraud, the combination 1997 Tax Ct. Memo LEXIS 639">*667 of a number of factors constitutes persuasive evidence. , affg. per curiam . A taxpayer's intelligence, education, and tax expertise are also relevant for purposes of determining fraudulent intent. See , affd. ; . We note that some conduct and evidence can be classified under more than one factor.

The list of the badges of fraud, however, is illustrative. We consider the totality of the facts and circumstances of each case to determine whether there is fraudulent intent. ;

Respondent contends that the following facts, taken as a whole, prove that petitioner had the intent to fraudulently evade paying income tax on at least some part of the underpayment for the years in issue: (1) Petitioner was aware of, and was receiving the proceeds from, the settlement check cashing; (2) he was an experienced attorney; (3) he failed to maintain adequate books and records; (4) he allegedly 1997 Tax Ct. Memo LEXIS 639">*668 misled the revenue agent; and (5) he dealt in cash.

As to the $88,000 in checks petitioner deposited into the Mitsui account in 1991, petitioner knew of these checks when his original and amended tax returns were filed. Additionally, we find that petitioner was aware that these checks were omitted from his return in 1991. His explanation that they were omitted due to a breakdown in communication with his accountant is unpersuasive. Petitioner may have wanted to conceal the Mitsui account from his accountant in order to prevent Mr. Yoon from learning of this account; however, that does not provide justification for omitting income. We conclude that respondent has clearly and convincingly proven fraud with regard to the checks deposited into the Mitsui account in 1991 that represent income to petitioner.

As to the $3,000 cash deposit into the Mitsui account in 1989, respondent merely asserts it was fraudulent and discusses petitioner's alleged check cashing scheme. Respondent provided little evidence to meet the burden of proving that any amount of this underpayment was due to fraud; therefore, we conclude that respondent has not clearly and convincingly proven fraud with regard to 1997 Tax Ct. Memo LEXIS 639">*669 the $3,000 cash deposit into the Mitsui account in 1989.

As to the portion of the underpayment attributable to the amounts petitioner claimed he paid Mr. Yoon as compensation in 1988 and 1989, we find that these amounts were not omitted with the intent to evade taxes. We conclude that respondent, therefore, has not met his burden of proving fraud by clear and convincing evidence with regard to any of the portion of the underpayment attributable to amounts petitioner claimed he paid to Mr. Yoon as compensation in 1988 and 1989.

STATUTORY PERIOD OF LIMITATIONS -- 1988, 1989, AND 1990

Petitioner's returns for 1988, 1989, and 1990 were filed more than 3 years before the subject notice of deficiency was mailed on July 7, 1995. Therefore, assessment of the deficiencies and additions determined in the notice is barred by the expiration of the statutory period of limitations on assessments, sec. 6501(a), unless one of the exceptions to the period of limitations is applicable; see sec. 6501(c).

As we have found, petitioner did not submit a fraudulent return with the intent to evade tax for any of the tax years 1988, 1989, or 1990. Therefore, the exception contained in section 6501(c)(1) does 1997 Tax Ct. Memo LEXIS 639">*670 not apply.

Respondent bears the burden of proving that the extended 6-year period of limitations specified in section 6501(e) is applicable to petitioner's 1988, 1989, and 1990 returns. ; . Respondent did not raise the application of section 6501(e)(1)(A) for the 1988 tax year. In an answer to petitioner's amendment to petition, respondent raised the application of section 6501(e)(1)(A) for the 1989 and 1990 tax years. Based on our findings regarding the cashed checks and the yearend ledger adjustments, respondent has failed to prove that petitioner omitted gross income in excess of 25 percent of the amount of gross income stated on his return. ⁷ Thus, any assessments relating to the 1988, 1989, or 1990 tax years are barred by the expiration of the period of limitations on assessment.

DELINQUENCY -- SECTION 6651(a)

Section 6651(a)(1) provides for an addition to tax of 5 percent 1997 Tax Ct. Memo LEXIS 639">*671 per month for each month or part of a month for which a return is late, the aggregate not to exceed 25 percent.

A taxpayer has a nondelegable duty to file a timely return but can avoid the addition to tax for failing to do so by affirmatively showing that the delinquency was due to reasonable cause and not due to willful neglect. Sec. 6651(a). The taxpayer bears the burden of proving both (1) that the failure did not result from willful neglect, and (2) that the failure was due to reasonable cause. . If the taxpayer does not meet this twin burden, the imposition of the addition to tax is mandatory. , affd. .

Respondent determined that petitioner is liable for a 25- percent addition to tax under section 6651(a)(1) for the 1989 and 1991 tax years. As we have already found, the 1989 tax year is closed pursuant to the statute of limitations; therefore, we confine our discussion of the addition to tax for failure to timely file to the 1991 tax year. Petitioner's 1991 Federal income tax return was filed on October 15, 1992. There is no evidence of a request for an extension 1997 Tax Ct. Memo LEXIS 639">*672 for the filing of the 1991 return. Petitioner argues that respondent has failed to establish that an extension was not filed for 1991. Petitioner, however, bears the burden of proof on the issue. Rule 142(a).

Petitioner further contends that his return preparer informed him that an extension to file his 1991 return had been obtained through October 15, 1992. Therefore, he argues that his failure to file a timely return was due to reasonable cause. Reliance on such erroneous advice from a tax preparer is not reasonable cause. . Moreover, petitioner is an attorney and should have known of his obligation to file a timely return. Thus, "when there is no question that a return must be filed, the taxpayer has a personal, nondelegable duty to file the tax return when due." . The addition to tax pursuant to section 6651(a)(1) is sustained. To reflect the foregoing,

Decision will be entered under Rule 155.