Contractor & Construction Tax Guide for Practitioners — 2026
Complete practitioner guide to contractor and construction taxation — percentage of completion method, completed contract method, home improvement vs. repair deductions, and subcontractor 1099 compliance. Updated for 2026.
Long-Term Contract Accounting Methods
| Accounting Method | Description | Who Can Use | Tax Impact |
|---|---|---|---|
| Percentage of completion (PCM) | Income recognized based on % of contract completed each year | All contractors with long-term contracts (>1 year) | Income spread over contract duration |
| Completed contract method (CCM) | All income and expenses recognized when contract is complete | Small contractors: avg. gross receipts ≤$30M (2026) | Defer income until project completion |
| Cash method | Income when received; expenses when paid | Small contractors: avg. gross receipts ≤$30M (2026) | Simplest; most flexibility |
| Accrual method | Income when earned; expenses when incurred | All contractors (required for large contractors) | Most accurate matching of income and expenses |
Source: IRC §460; §448; Rev. Proc. 2025-32 (2026 gross receipts threshold)
The completed contract method advantage: For small contractors (average gross receipts under $30M), the completed contract method allows deferral of all income and expenses until the contract is complete. This can provide significant tax deferral benefits — especially for contractors with large projects that span multiple tax years. The CCM is only available for contracts that are expected to be completed within 2 years.
Look-back interest: Contractors using the PCM must calculate 'look-back interest' when a contract is completed — comparing the actual income recognized to the income that would have been recognized under the actual completion percentages. If the contractor deferred income, they owe look-back interest; if they accelerated income, they receive a refund.
Subcontractor 1099 Compliance
| 1099 Compliance Issue | Requirement | Penalty |
|---|---|---|
| 1099-NEC threshold | $600+ paid to any non-employee for services | $310 per form (2026); up to $1,280,000/year |
| Backup withholding | 24% if subcontractor fails to provide TIN | Contractor is liable for backup withholding |
| W-9 collection | Collect before first payment | Required to avoid backup withholding |
| January 31 deadline | 1099-NEC must be filed with IRS and provided to recipient by January 31 | Late filing penalties apply |
| Misclassification risk | Treating employees as independent contractors | Back payroll taxes + penalties + interest |
Source: IRC §6041A; §3406; IRS Publication 1220
The construction industry has one of the highest rates of worker misclassification. The IRS and state labor departments actively audit construction companies for worker misclassification. If a worker is found to be an employee rather than an independent contractor, the contractor owes: (1) back payroll taxes (employee + employer share); (2) failure-to-deposit penalties (up to 15%); (3) failure-to-file penalties; and (4) interest. The total liability can easily exceed $50,000 per misclassified worker.
Home Improvement vs. Repair — The Critical Distinction
| Category | Tax Treatment | Examples |
|---|---|---|
| Capital improvement | Capitalized; depreciated over useful life | New roof, addition, HVAC replacement, kitchen remodel |
| Repair/maintenance | Deductible as current expense | Patching a roof, painting, fixing a broken window |
| Betterment | Capitalized; improves condition beyond original | Upgrading from standard to premium materials |
| Restoration | Capitalized; restores to working condition after deterioration | Major structural repair after storm damage |
| Adaptation | Capitalized; adapts to new use | Converting residential to commercial use |
Source: Treas. Reg. §1.263(a)-3 (UNICAP rules for improvements)
Case Study: Tom B., general contractor. 2025 gross receipts: $3.2M. Previously using cash method with minimal planning. Practitioner identified: completed contract method election (deferred $280,000 in income to 2026); 1099-NEC compliance review (identified 8 subcontractors without W-9s; implemented backup withholding procedures); Section 179 on $185,000 in new equipment; SEP-IRA $45,000; home office $4,800. Total first-year tax savings: $82,000. Practitioner fee: $5,500. ROI: 14.9:1.
Frequently Asked Questions
The information on this page is intended for licensed tax professionals (CPAs, EAs, and tax attorneys) and is provided for educational and research purposes only. Tax law is complex and fact-specific — all strategies discussed are subject to limitations, phase-outs, and conditions that may not apply to every client situation. Practitioners should independently verify all information against current IRS guidance, Treasury Regulations, and applicable state law before advising clients. This content does not constitute legal or tax advice.
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