US tax deadlines 2027
See every IRS deadline for the 2026 tax year: estimated tax payments, the 15 April filing date, IRA contributions and extensions, with a countdown and calendar download.
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Key IRS dates for the 2026 tax year, filed in 2027.
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Last day for 2026 401(k) contributions
401(k) deferrals must come out of a 2026 paycheck. IRA contributions can still be made until 15 April 2027.
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Fourth 2026 estimated tax payment
Covers income from September to December 2026, using Form 1040-ES.
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W-2 and 1099-NEC forms due
Employers and clients must send W-2s and 1099-NECs to workers and the IRS (31 January is a Sunday).
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2026 tax return and payment due
File Form 1040 and pay any tax owed. Also the last day for 2026 IRA and HSA contributions, the first 2027 estimated payment, and to request an extension with Form 4868.
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Second 2027 estimated tax payment
Also the automatic filing deadline for US citizens living abroad (tax was still due 15 April).
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Extended 2026 tax return due
For those who filed an extension. The extension was to file, not to pay.
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Last day for 2027 401(k) contributions
The 2026 limit was $24,500, plus catch-up from age 50.
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Fourth 2027 estimated tax payment
15 January 2028 is a Saturday and 17 January is Martin Luther King Jr. Day.
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Source: IRS Publication 509 (2027 draft) and Form 1040-ES; 18 January 2028 is worked out from the IRS weekend and holiday rule. If a date falls on a weekend or holiday, the deadline is usually the next working day; the dates above already allow for that where the tax authority says so.