IRC Section 460 Long-Term Contracts: The 2-Year Rule and the Small Contractor Exception

Section 460 defines a long-term contract narrowly: any contract for "the manufacture, building, installation, or construction of property" that is not completed in the same taxable year the contract is entered into.^[2] The timing test is the whole trigger. A roofing job signed in October and finished in December is not a long-term contract. The same roofing job signed in December and finished in February is, because it crosses the year end.

That definition is why a contractor can walk into section 460 without ever planning to. A small renovation that was meant to wrap inside the year drifts past the taxpayer's year end because of a change order, and the taxable income on the whole job is suddenly subject to a different accounting rule. The IRS Tax Guide for Small Business lists long-term contract methods as a special method and sends the reader straight to the statute: "Long-term contract methods of accounting. See section 460."^[9] The firm's business tax return preparation work is where the method ends up applied, but the exposure begins at the contract.

The Code's subsection (a) is one sentence and it is categorical: "In the case of any long-term contract, the taxable income from such contract shall be determined under the percentage of completion method".^[1] The method lines costs allocated to the contract against estimated total contract costs, and recognizes contract revenue in each year to match. The IRS gets its share early, before anyone knows what the job actually earned.

That timing is the whole point of the regime. A completed-contract method would let the contractor hold off recognizing any income until acceptance, which Congress treated as too long a deferral once the contract spans tax years. The look-back method of paragraph (2) exists for the mirror problem: estimates miss, taxable income gets reported in the wrong year, and the Code reaches back to reallocate on actual numbers. Treating a long-term contract as cash or completed-contract when section 460 applies is an accounting method error, not a timing choice, and backing out of it is a method change under IRS control rather than a self-correction.

Subsection (e) carves out the way back out. The Code puts it in one block: "Subsections (a), (b), and (c)(1) and (2) shall not apply to- (A) any home construction contract, or (B) any other construction contract entered into by a taxpayer" who clears two gates.^[3] A home construction contract is excepted outright, no size test attached. Every other construction contract has to clear both of the following conditions, together: the taxpayer "estimates (at the time such contract is entered into) that such contract will be completed within the 2-year period beginning on the contract commencement date of such contract" and the taxpayer "meets the gross receipts test of section 448(c) for the taxable year in which such contract is entered into".^[4]

The gross receipts test is the number most contractors have in mind, and the small business taxpayer definition in the IRS Tax Guide for Small Business reads: "You qualify as a small business taxpayer if you (a) have average annual gross receipts of $31 million or less for the 3 prior tax years (indexed for inflation), and (b) are not a tax shelter (as defined in section 448(d)(3))".^[8] So a general contractor with 3-year average receipts of $31 million or less, taking on a construction job the field estimates will finish inside two years, is out of section 460 for that contract. A general contractor over the threshold, or taking on a job the field cannot honestly estimate inside two years, is in. The analysis belongs upstream in advisory solutions, before a method choice is baked into the return.

The home construction exception is the broader of the two, and it is defined by composition rather than size. The Code sets the test on costs: a construction contract qualifies if "80 percent or more of the estimated total contract costs (as of the close of the taxable year in which the contract was entered into) are reasonably expected to be attributable to activities" tied to dwelling units in buildings of 4 or fewer dwelling units.^[5]

Two lines of that definition get missed. First, the 80 percent is measured at the close of the taxable year the contract was entered into, not continuously as the job proceeds, so a job that drifts into mixed-use work after year one does not retroactively fail the test. Second, the dwelling-unit ceiling is tested per building: a townhouse row where each townhouse is a separate building is a home construction contract; a single building with 5 or more units is not. A contractor doing single-family and small-multifamily work is almost always inside the exception; a contractor whose mix tilts toward larger multifamily, mixed-use, or commercial will not be. Our construction + contracting tax help page is where the industry details hang off the explainer.

The look-back method is the pressure the percentage of completion method puts on a contractor's estimates. The Code describes it mechanically: the "look-back method of this paragraph shall be determined by- (A) first, allocating income under the contract among taxable years before the year in which the contract is completed on the basis of the actual contract price and costs instead of the estimated contract" figures used at the time.^[6] Once the actual numbers are in, each pre-completion year is re-opened on paper, the correct allocation is computed, and the resulting overpayments or underpayments of tax carry interest at the adjusted overpayment rate for each of those years.

The compute lives on Form 8697: "Use this form to figure the interest due or to be refunded under the look-back method of section 460(b)(2) on certain long-term contracts that are accounted for under either: the percentage of completion method, or the percentage of completion-capitalized cost method. Current revision Form 8697 PDF Instructions for Form 8697" is the IRS's own one-line description.^[7] A contractor whose contract revenue consistently beats estimates will owe interest for underreporting in early years. A contractor whose contract runs over cost will be refunded interest for overreporting. Either way, the look-back is not optional for a contract that stays inside the percentage of completion method.

Four categories of error show up again and again. The first is treating a job that crossed the year end on cash or completed-contract when the exception is not actually met. The 2-year clock in 460(e) starts on the "contract commencement date", not on the day work started, and the 2-year window is tested when the contract is entered into, not retested as the job proceeds.^[4] A contract honestly estimated to close inside 2 years that overruns because of a change order remains inside the exception; a contract that was never realistically a 2-year job but got written as one does not. The second is misreading the 80 percent test on home construction. Costs flowing to common areas, site work on a mixed-use parcel, and roadways serving a mix of residential and commercial can push a job below the 80 percent dwelling-unit share without the superintendent ever noticing.^[5]

The third is skipping the look-back when the exception does not apply. The look-back is not an audit event; it is the Code's completion mechanic for a percentage-of-completion contract.^[6] Not running it when the contract was inside 460(a) is the single most common deferred-attention error, and interest keeps accruing while the compute waits. The fourth is treating the method as a choice. The method is required by the statute; swapping to it after the fact is a method change under IRS control, not a voluntary correction. The firm's small business accounting work is where the ledger is kept so that a method change, when one is needed, has a defensible starting point.

Three stakes are concrete. Accelerated taxable income is the most visible: a contractor who booked a multiyear job entirely at completion on the completed-contract method, when 460(a) required percentage of completion, has effectively deferred recognition that the IRS says it was owed in prior years, and the correction catches up all at once. Look-back interest is the second: on a contract that stayed under percentage of completion, missing Form 8697 at completion leaves the overpayment or underpayment interest unresolved, and the IRS can assess the interest later with its own clock running against the taxpayer.^[7] Accounting method risk is the third: an unauthorized method change is on the IRS's terms and timing, which rarely favor the contractor's cash position.

The exposure is also quiet. There is no annual notice telling a contractor whose mix drifted that the home construction exception no longer fits. There is no reminder that a two-year estimate stretched past its window ends up subject to look-back once the job completes. The protection is to re-apply the exception analysis as the backlog turns over, keep the dwelling-unit cost mix on the books, and run the look-back the year the contract closes rather than the year the IRS asks.^[6]