(US) — Wind developers have until July 5, 2026 to begin construction under the IRS physical-work test, after updated federal guidance gave projects a short extension. The date matters for tax year 2026, with returns generally filed in 2027, because a new law cuts off key wind and solar credits for projects that begin construction after July 4, 2026 and are placed in service after December 31, 2027.

The rule is narrow but unforgiving. A project does not preserve eligibility by planning work, ordering equipment, or waiting on approvals alone. It must start physical work of a significant nature before July 5, 2026. After that, the project must maintain a continuous program of construction to remain within IRS standards.

The IRS also applies a continuity safe harbor. A facility is treated as satisfying the continuity requirement if it is placed in service within four calendar years of the year construction began. A project that starts construction in 2026 generally must be placed in service by December 31, 2030 to fall within that safe harbor.

That four-year window does not expand automatically. Delays tied to weather, permitting, interconnection, or supply-chain problems do not extend the safe-harbor period. Developers that miss the placed-in-service deadline can still try to show facts-and-circumstances continuity, but the bright-line safe harbor is fixed at four calendar years.

The credit structure remains important because wind projects have historically qualified for the Production Tax Credit, or PTC, and in some cases the Investment Tax Credit, or ITC, in lieu of the PTC. The Congressional Budget Office describes the ITC as a one-time credit tied to a percentage of project cost. It describes the PTC as a production-based credit tied to electricity generated during the first 10 years of operation.

The policy backdrop shifted sharply this year. The new law rolled back several clean-energy incentives and ended Section 45Y and Section 48E eligibility for wind and solar projects that miss the construction cutoff. That leaves little room for projects still deciding whether site work, foundation work, or other qualifying activity will begin before the deadline.

Immigrant investors, foreign-owned developers, and visa holders working in project finance face the same federal tax deadlines as domestic sponsors. Entity structure, treaty claims, and cross-border financing still matter, but they do not change the begin-construction test. IRS international tax guidance, including taxpayer resources, does not create a separate extension for foreign owners.

📅 Deadline Alert: Starting qualifying physical work on July 5, 2026 is too late. The work must begin before July 5, 2026.

Developers should separate the begin-construction test from normal tax filing deadlines. This is not an extension request filed with an income tax return. There is no standard IRS form that grants more time to start construction. Forms and publications are available at forms and publications, but this deadline turns on project activity, records, and technical tax credit rules rather than a filing extension.

The Department of Energy has noted that the Inflation Reduction Act extended and increased wind credits for projects that began construction before January 1, 2025. It also noted that projects beginning construction on or after January 29, 2023 generally must satisfy prevailing-wage and apprenticeship rules to receive full credit value. Missing those labor rules can reduce the credit even when the project meets the physical-work test.

Onshore wind projects may find it easier to start site and foundation work before the deadline. Offshore wind projects face longer permitting, vessel, and supply timelines. That does not change the IRS rule. A slower construction profile raises the risk of falling outside the continuity safe harbor, especially where placed-in-service dates already sit near the edge of the four-year period.

⚠️ Warning: Weather delays, permit disputes, and equipment shortages do not automatically extend the four-year safe-harbor period.

Records will matter if the IRS later examines the project. Developers should keep dated contracts, engineer reports, construction logs, invoices, photographs, and board approvals. Those records help establish when physical work of a significant nature began and whether a continuous program of construction followed. General IRS guidance on federal tax administration appears in Newsroom, while broad taxpayer rules appear in Publication 17. International filers can also review Publication 519, the U.S. Tax Guide for Aliens.

The immediate checklist is short. Confirm that qualifying physical work starts before July 5, 2026. Track labor compliance if the project began on or after January 29, 2023. Build a schedule that supports a placed-in-service date by December 31, 2030 for projects that start in 2026. Foreign investors and visa holders with ownership stakes should also review entity structure, withholding, and treaty positions with a tax adviser before the 2026 year closes.

⚠️ Disclaimer: This article is for informational purposes only and does not constitute tax, legal, or financial advice. Tax situations vary based on individual circumstances. Consult a qualified tax professional or CPA for guidance specific to your situation.