Fluctuating job costs are a common challenge in long-term construction projects. But beyond rising material and labor expenses, factors like permitting delays, regulatory changes, and shifts in the economy can all affect the total project cost—and, ultimately, taxable profit—compared to initial estimates.
Despite these uncertainties, federal income taxes must be paid annually based on those early estimates. That’s where the look-back method comes in. This tax accounting tool allows construction companies—and the IRS—to retroactively adjust taxes on long-term contracts to reflect actual profits or losses, and to calculate interest on any over- or underpaid income taxes.
While the look-back method should be implemented with guidance from a CPA, it’s important for construction business owners and leadership teams to understand how it works so they can plan accordingly.
Basic Rules
The look-back method (or just “look-back” for short) typically applies to long-term contracts accounted for under the percentage-of-completion method (PCM) or the percentage-of-completion-capitalized-cost method (PCCM). For tax purposes, long-term contracts are generally considered those started in one tax year and not completed until a later tax year.
For long-term contracts reported under the PCCM, look-back applies to the portion of the contract that’s subject to the PCM (70% for long-term residential contracts with four or more dwelling units). In addition, it applies to long-term contracts that must be reported under the PCM for alternative minimum tax (AMT) purposes, including the remaining 30% on long-term residential contracts, when applicable.
In the year of completion, the income from 
covered contracts is allocated among the previous tax years based on the actual contract price and costs instead of the estimated figures. In the case of an underpayment, the construction business must pay look-back interest on the shortfall.
If the reallocation reveals that the construction company paid the taxes on an accelerated basis — because it overestimated gross profits on a long-term contract in an earlier year — the business is entitled to a refund of interest on the overpayment. The amount of look-back interest received, and any additional interest received on the look-back interest (which often occurs because the IRS doesn’t immediately pay a refund due), is included in taxable interest income for the tax year it’s received or accrued.
Important: The look-back method doesn’t change the total amount of taxes paid on a long-term project. It simply accounts for timing differences through interest. Estimated tax penalties don’t apply.
The look-back method also applies to any post-completion tax year in which you must adjust the total contract price or total allocable contract costs. This might occur if, for example, you receive additional income from the settlement of a dispute regarding a contract after completion.
Examples of Exemptions
An exemption from having to carry out the look-back method may be available under certain circumstances. Generally, look-back doesn’t apply to:
- Home construction contracts,
- Contracts completed within two years of the contract start date with a gross contract price that doesn’t exceed the lesser of 1) $1 million, or 2) 1% of the taxpayer’s average annual gross receipts for the three tax years preceding the tax year of completion (known as the mandatory de minimis exception), and
- Contracts under which the cumulative taxable income for each previous year is within 10% of the cumulative look-back income for each previous year if the taxpayer elects not to apply the look-back method (known as the elective de minimis exception).
Cumulative look-back income or loss is the amount of taxable income or loss a construction company would have reported if it had relied on the actual contract price and costs rather than the estimated figures.
A “non-home” construction contract that isn’t completed in the same tax year it’s entered into is generally subject to the PCM and, therefore, the look-back method — unless the construction business in question qualifies for the small contractor exemption.
To be eligible for this exemption, a construction business’s annual average gross receipts for the preceding three tax years can’t exceed $31 million. (This is known as the “annual gross receipts test,” and the revenue amount is inflation-adjusted annually.) In addition, when entering into the contract, the contractor must estimate that the project will be completed within the two-year period beginning on the contract’s commencement date.
If, however, you’re required to use the PCM for AMT purposes, you must also apply the look-back method for calculating your AMT liability.
Complex Requirements
We’ve touched on only a few points regarding the look-back method and the related tax accounting methods. Additional conditions and rules may apply to your construction company’s situation. Please contact us for help with the complex requirements involved in recognizing revenue from long-term contracts.
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