Justice WILLETT delivered the opinion of the Court.

This tax-refund case concerns the Tax Code's sale-for-resale exemption, which grants purchasers of taxable goods and services a sales-tax exemption if they resell the items (since the ultimate purchaser will pay any tax due). Here, a government contractor seeks sales-tax refunds for purchases used to administer federal health-insurance programs. The question is one of scope: What categories of purchases qualify for the exemption?

Applying the Legislature's sale-for-resale definition and exemption language, we believe the contractor here is entitled to most of the claimed refunds. There are three main categories of goods and services for which refunds are claimed: tangible personal property, taxable services, and leases of tangible personal property. We hold that the exemption applies to the tangible personal property and taxable services, but not to the leases of tangible personal property, for the following reasons:

Finally, we hold that reimbursement of a tax is not the same as collection of a tax. Thus, the requirement that a taxpayer who claims a refund show he has not collected the tax from someone else does not also require the taxpayer to show he has not been reimbursed for the tax. Accordingly, we affirm the court of appeals' judgment on all but the lease issue, which we reverse and remand to the trial court for further proceedings.

I. Background

Health Care Services Corporation and its predecessor-in-interest, Blue Cross and Blue Shield of Texas, Inc. (collectively HCSC), contracted with the federal government to administer two health-insurance programs.1 While performing these contracts, HCSC incurred expenses that were reimbursed by the federal government.

HCSC paid sales and use tax on some of these expenses and applied for a refund under the sale-for-resale exemption.2 The Comptroller denied the refund. HCSC brought two separate tax-refund suits, the first covering December 1, 1988 through December 31, 1998, and the second covering January 1, 1999 through December 31, 2003. The two cases were nearly identical except for minor variations in the specific property and services for which HCSC sought a sales-tax refund.3 However, in both cases, HCSC claimed the sale-for-resale exemption for three general categories of property and services it used to perform the contracts: (1) tangible personal property (such as chairs, printers, and office supplies); (2) taxable services (such as printer repair services, landscape maintenance, and copier maintenance); and (3) leases of certain tangible personal property (such as leases of computers, audio equipment, and printers).

In both cases, the court of appeals affirmed trial-court decisions that HCSC was entitled to the claimed refunds.4 We consolidated the cases and issue this joint decision.

II. Discussion

The Comptroller argues the sale-for-resale exemption is inapplicable and also that HCSC should have to prove the federal government did not already reimburse it for the sales tax for which it requests refunds.

We affirm in part, reversing solely on the leases of tangible personal property. HCSC is entitled to a sales-tax refund for the tangible personal property and taxable services but not for the leases of tangible personal property. Also, HCSC need not show whether the federal government reimbursed it for the taxes.

A. Tangible Personal Property

At all relevant times, the Tax Code defined sale for resale as a sale of:

The statute applies to the tangible personal property here. HCSC purchased the "tangible personal property" for the purpose of "reselling it ... in the normal course of business in the form or condition in which it [was] acquired." The trial court found that HCSC's normal course of business was performing federal government contracts, and the resale furthered those contracts. Further, the tangible personal property was automatically resold to the federal government as soon as it was acquired due to the title-transfer provisions.6 Title transfer for consideration is one type of "sale."7 Therefore, the property was resold (through title transfer) in the "form or condition in which it [was] acquired": the resale was automatic upon acquisition, so, naturally, the property was resold before HCSC had any chance to alter it.

The Comptroller asserts that Section 151.006(a)(1) requires the application of an "essence of the transaction" test. The Comptroller's argument is essentially that the exemption should only apply if the primary purpose of the original sale is to resell "in the form or condition in which it is acquired or as an attachment to or integral part of other tangible personal property or taxable service." Here, the primary purpose of the original sale was to acquire property that would be consumed in performing a nontaxable service, so the exemption should not apply. This restrictive interpretation collides with the statutory text.

The exemption does not say (or even intimate) that the primary purpose of the sale must be for a particular kind of resale.8 The statute merely says the sale must have "the purpose" of reselling in one of the specified ways; not "the primary purpose," "the main purpose," or "the important purpose." Here, HCSC bought tangible personal property for the purpose of transferring its title to the federal government; we know this was the purpose because it was an unavoidable result given the automatic title-transfer provision. It is irrelevant that a second purpose of the sale was to acquire property that would be consumed in performing the nontaxable services. Taking the Legislature at its word and giving the statute its plain meaning, the definition and exemption apply.

This plain-text analysis reaffirms our holding in Day & Zimmermann, Inc. v. Calvert.9 That case involved a taxpayer, Day & Zimmerman, that contracted with the federal government "for the loading, assembling and packaging of ammunition and related components as well as the handling of the mechanics of procurement of all necessary materials, supplies, equipment and services."10 The contract between Day & Zimmerman and the government contained an automatic title-transfer provision similar to the one here.11 The Comptroller made a deficiency determination against Day & Zimmerman for the sales tax paid for "the tangible personal property, not including any of the component parts that went into the finished product, purchased and consumed by the operating contractor in the performance of its contract with the Federal Government."12 We held that the sales tax for this property had to be refunded to Day & Zimmerman because the transaction fell within the sale-for-resale exemption. The sale happened when the tangible personal property was physically transferred from the vendor to Day & Zimmerman.13 Then, because the definition of "sale" included title transfer for consideration, the resale happened when title to the property transferred from Day & Zimmerman to the federal government.14 Day & Zimmermann is thus completely consistent with our decision today, both in its holding and its reasoning.

We find unpersuasive the Comptroller's attempt to distinguish Day & Zimmermann. The Comptroller argues that Day & Zimmermann involved a contract where the "essence of the transaction" was selling goods, whereas the essence of the transaction here is selling nontaxable services to which Section 151.006(a)(1) does not apply. So, the Comptroller says Day & Zimmermann is consistent with her proposed essence of the transaction test. The difficulty with this reasoning is simply stated: Day & Zimmermann never mentions or alludes to any such test. Moreover, it's anything but clear whether the essence of the transaction was reselling tangible personal property (ammunition) or reselling services (assembly and packaging of ammunition).15 If the essence of the transaction really mattered, we would expect a more detailed description of the contract's "essence." Day & Zimmermann did not contemplate an "essence of the transaction" test because no such discussion exists. Instead, Day & Zimmermann stands for the proposition that automatic title transfer upon purchase qualifies for the sale-for-resale exemption. Day & Zimmermann cuts squarely in HCSC's favor due to the analogous title-transfer provisions.

The Comptroller next urges that Day & Zimmermann was abrogated by amendments to the sale-for-resale statute. While conceding that "sale" is still defined to include bare transfer of title of tangible personal property for consideration,16 she asserts that two amendments have changed the legal landscape and rendered Day & Zimmermann irrelevant: (1) a change to the definition of "sale for resale," and (2) a new provision dealing with certain transactions that mix the resale of tangible personal property with the resale of taxable services. Upon careful examination of the amendments, the Comptroller's argument fails.

1. The Slight Definitional Change to "Sale for Resale" Does Not Abrogate Day & Zimmerman and Defeat the Exemption

In Day & Zimmermann, the statutory definition of sale for resale was:

The statutory definition relevant to this case reads:

Studying these similar statutes, it is difficult to understand the Comptroller's argument that the statutory definition has changed so much as to revoke Day & Zimmermann. The new version merely seems to recognize the fact that some services are now taxable in Texas, whereas they were not when Day & Zimmermann was decided almost forty years ago.

The Comptroller's main argument appears to be that adding the words "taxable service" throughout the definition makes it clear that tangible personal property cannot be considered "resold" if the property is merely used to provide a nontaxable service. After all, says the Comptroller, the definition doesn't mention nontaxable services. But the Day & Zimmermann-era statute similarly made it clear that tangible personal property could not be considered "resold" if it was merely used to provide a service because the definition did not mention any services.

The Comptroller also argues that the statutory change unambiguously requires (or, in the alternative, ambiguously allows) application of the "essence of the transaction" test. The trouble with this argument, again, is that the changes since Day & Zimmermann say nothing about the "essence of the transaction" test. We do not see how the revisions have introduced any ambiguity into the statute that would allow application of the "essence of the transaction" test when it did not apply in Day & Zimmermann. In sum, the definitional changes to "sale for resale" do not statutorily abrogate Day & Zimmermann.

2. New Tax Code Section 151.302(b) Similarly Does Not Abrogate Day & Zimmerman and Defeat the Exemption

The Comptroller next argues that Day & Zimmermann was abrogated by Section 151.302(b), which provides:

But it is uncontested in this case that HCSC is asking for a refund for tax paid on tangible personal property used to perform a nontaxable service because administrative services are not listed as a taxable service in Section 151.0101(a). Tangible personal property used to perform a nontaxable service is outside the exception to the exemption created by Section 151.302(b); by its own terms, that section only applies to tangible personal property used to perform a taxable service.

Perhaps it seems strange to distinguish between taxable and nontaxable services in Section 151.302(b). After all, if HCSC had transferred bare title to the tangible personal property and then consumed it in performing a taxable service, HCSC would not be entitled to a reimbursement. However, we read unambiguous statutes as they are written, not as they make the most policy sense. If a statute is worded clearly, we must honor its plain language, unless that interpretation would lead to absurd results. The Comptroller urges deference to its interpretation, but we recently canvassed our articulations of the agency-deference doctrine and formulated this test:

It is true that courts grant deference to an agency's reasonable interpretation of a statute, but a precondition to agency deference is ambiguity; "an agency's opinion cannot change plain language."21 There is no ambiguity about the ambiguity requirement, nor with the unassailable rule that agency interpretations cannot contradict statutory text. Here, the Comptroller's interpretation is contrary to the Tax Code. The statute unambiguously applies only to tangible personal property used to perform a taxable service. Further, it is not absurd for the Tax Code to treat nontaxable services more favorably than taxable services; indeed, the Tax Code already treats nontaxable services more favorably by not taxing them. Summing up: As Section 151.302(b) explicitly applies only to tangible personal property used to perform taxable services, we decline the Comptroller's invitation to rewrite the statute to reach nontaxable services, too.

3. Given the Statute's Clarity, the Comptroller's Unintended Consequences Arguments Are Unavailing

The Comptroller contends the Legislature could not have intended to exempt HCSC from sales tax for items it consumed itself. Arguing that a plain-language interpretation of the exemption would produce unintended consequences, she asserts the "tie-pin" example: that HCSC should not be refunded sales tax on tie pins it bought to reward its employees for good work.

We recognize that statutes, framed in general terms, can often work peculiar outcomes, including over- or under-inclusiveness, but such minor deviations do not detract from the statute's clear import. If an as-written statute leads to patently nonsensical results, the "absurdity doctrine" comes into play, but the bar for reworking the words our Legislature passed into law is high, and should be. The absurdity safety valve is reserved for truly exceptional cases, and mere oddity does not equal absurdity. A sales-tax exemption for tie pins, even if unintended, even if improvident, even if inequitable, falls short of being unthinkable or unfathomable. The absurdity backstop requires more than a curious loophole. Indeed, given the complexity of modern tax laws (and the haste with which many are enacted), whimsical examples of over- or under-inclusiveness, likely wholly unintended, doubtless abound.22 But pointing out a quirky application is quite different from proving it was quite impossible that a rational Legislature could have intended it.

Since at least Day & Zimmermann, items consumed while performing a contract with a title-transfer provision have clearly been covered by the sale-for-resale exemption. If the Legislature considered this a loophole worth closing, it could have done so. In fact, lawmakers in 2011 narrowed it via Section 151.006(c), which reserves this sale-for-resale exemption to contractors that are partnering with federal national security-related agencies.23

B. Taxable Services

The Comptroller argues that the taxable services that HCSC bought on the government's behalf fall outside the sale-for-resale exemption because the title-transfer clauses did not transfer title of the taxable services to the federal government. However, title transfer clearly is not the only way to bring about a resale. Instead, "sale" also includes "performance of a taxable service" for consideration.24 Here, HCSC bought these taxable services (the sale). HCSC then resold the services to the government by directing that they be performed on the government's behalf with the purpose of receiving reimbursement and compensation (consideration) from the government (the resale). The sale-for-resale exemption explicitly includes the sale-for-resale of a service when it is resold "in the form or condition in which it is acquired."25 Here, HCSC bought the services and then immediately resold them to the federal government, so the services were resold in the same form as they were acquired, thus qualifying for the sale-for-resale exemption.

The Comptroller attempts to recharacterize HCSC's sale-for-resale of services as sale-for-resale of service contracts. However, the trial court's findings of fact include findings that the services at issue were performed on behalf of the federal government and that HCSC was compensated for them. Therefore, because the Comptroller has not challenged the evidentiary sufficiency of these factual findings, we accept them as a true characterization of the transfer. That is, the resale to the government was the performance of the services for consideration, not merely a resale of service contracts.

C. Leases of Tangible Personal Property

The Comptroller further argues that the leases of tangible personal property fall outside the sale-for-resale exemption. After all, the Comptroller says, leases themselves are not tangible personal property, so sale-for-resale of a lease is not the sale-for-resale of tangible personal property. But "lease" is statutorily included in the definition of "sale."26 Therefore, lease-for-(re)lease of tangible personal property falls within the definition of sale-for-resale of tangible personal property.

That said, there is no evidence here that HCSC leased the property for the purpose of releasing it. That is, using the property for the federal government contract is not the same as formally re-leasing the property to the federal government. The trial court pointed out that some leased property was transferred to the new contractor after HCSC's contract ended. But there is no finding or even allegation that HCSC's purpose in leasing the property in the first place was to re-lease it to the federal government or another contractor. Instead, the transfer of the leased property apparently only happened because the federal contract ended, not because the original purpose of leasing the property was to re-lease it. Thus, HCSC is not due a refund on sales tax paid on the leases.

D. Documentation of Reimbursements

HCSC is not required to produce documentation proving it did not receive federal government reimbursement for the sales tax it paid. Section 111.104(f) provides:

The Comptroller argues that this section imposes a burden on HCSC to show it was never reimbursed for the taxes it is seeking to have refunded. The Comptroller claims that HCSC can't prove that here.28 But the statute precludes a refund only if HCSC collected a tax, not just if it was reimbursed some amount that may or may not include a tax. The Comptroller claims that being reimbursed for a tax is equivalent to collecting a tax. That is simply not the case. At all times relevant to this dispute, the Tax Code provided that a person who collects a tax holds that money in trust for the State.29 Such a trust relationship clearly did not exist here; the federal government did not pay HCSC tax for it to hold in trust and then remit to the State. Further, in the sales tax context, tax is collected by a seller adding the sales tax to an initial sales price and then charging that amount to the buyer as part of the new sales price.30 Such a collection process did not occur here.

That is, contrary to the Comptroller's argument, collecting a tax is not the same as reimbursing a tax. Hypothetically, a contractor and the federal government could agree for the government to pay ten percent of sales tax as part of the consideration for the contract; this would not mean that the contractor would "collect" ten percent of sales tax from the federal government. Instead, the sale price itself would go up by ten percent of the sales tax rate. Such a contract might actually be sensible if a federal contractor foresaw having to fight with the Comptroller to get a refund for the tax. A very similar (although less transparent) contractual arrangement may have occurred here; the federal government may have paid part of the sales tax price as part of the consideration for the contract.

However, if the federal government's contractual arrangement did not intend to pay HCSC for sales tax that was ultimately refunded, the federal government can likely recover the portion of the sales tax that it paid.31 Therefore, the risk of HCSC receiving an unintended windfall at the federal government's expense is slight.

Regardless, though, as explained above, the statute designed to prevent double recovery (Section 111.104(f)) is inapplicable in light of the fact that HCSC never "collected" tax from the federal government, which is a prerequisite for the statute's application.32 Our statutory interpretation is reinforced by the fact that it makes sense from a policy perspective to prevent refund of tax only when it is explicitly collected from (i.e., charged as tax to) the buyer. After all, when such a tax is charged to a buyer, the buyer's understanding is that the portion of the sale attributed to tax will be paid to the government. The buyer also knows that any profit the seller makes in the transaction is through the sales price alone. On the other hand, with a lump sum charge to a customer that does not clearly delineate sales tax, the customer has no such expectation that a certain portion will be remitted to the State. It would also make very little sense to make federal government contractors write up transaction-by-transaction receipts with line items saying "Tax Collected = 0" for each transaction. Money is plainly and inarguably fungible, so even if the tax collected is listed as zero, federal contractors could just increase the amount they are paid under the contract to cover any money spent on sales tax. There is no reason to force contractors to engage in such creative accounting when the statute itself does not dictate that result.

III. Conclusion

We affirm in part and reverse in part, holding that HCSC is entitled to a sales-and use tax refund for all the transactions except the leases of tangible personal property. We remand to the trial court for further proceedings consistent with this opinion.