New Mexico tracks the federal calendar for individuals and corporations and the federal pass-through date for entities. For the 2025 tax year, individual and C-corporation returns are due April 15, 2026, and pass-through returns are due March 16, 2026. One thing to retire from older guidance: New Mexico no longer grants the late-April extended deadline for electronic filers, so April 15 applies to everyone.

What are New Mexico's 2026 tax filing deadlines?

For the 2025 tax year, the New Mexico individual return (PIT-1) and the corporate income and franchise return (CIT-1) are due April 15, 2026. The pass-through entity return (Form PTE) and S-corporation return are due March 16, 2026, since the statutory March 15 date falls on a Sunday. Both paper and electronic individual returns share the April 15 date.

How does New Mexico's extension work?

New Mexico honors the federal automatic six-month extension, moving the filing deadline to October 15, 2026. A taxpayer without a federal extension files Form RPD-41096. The extension is to file only; interest accrues on tax unpaid after April 15, 2026. The corporate return carries a $50 annual franchise tax that is owed even with no income tax due.

What is New Mexico's entity-level tax election?

New Mexico lets a pass-through entity elect to pay tax at the entity level, which moves the deduction above the federal SALT cap. The election is available for 2025 and is made on the entity return itself, with no separate election form, and must be made each year. The rate follows the higher of the personal or corporate rate, with a current top rate of 5.9%. Owners claim a credit for the tax paid on their behalf.

How does New Mexico tax nonresident pass-through owners?

The entity withholds. A pass-through must withhold New Mexico tax on each nonresident owner's allocable share of net income, reported on the entity's own return, unless the entity-level tax was elected for that owner. The withholding follows the highest individual rate, currently 5.9%. Nonresident owners may instead join a composite return.

Who owes New Mexico estimated tax?

Individuals expecting to owe $1,000 or more after withholding pay quarterly on April 15, June 15, September 15, 2026, and January 15, 2027 (Form PIT-ES). The safe harbor is 90% of the current year or 100% of the prior year, with no high-income step-up.

How does a firm handle New Mexico at scale?

The cleanup item is the stale e-file deadline. Any checklist still showing a late-April New Mexico date for electronic filers is wrong, so move every PIT-1 to April 15. Beyond that, track the March pass-through date separately from the April individual and corporate dates, and decide the entity-level election before filing. See how we think about scaling tax prep workflows.

Where do these dates come from?

All deadlines and thresholds here trace to the New Mexico Taxation and Revenue Department. Verify against the source before filing.