Key federal and Pennsylvania dates for the 2026 tax year, filed in 2027. When a date falls on a weekend or holiday it moves to the next business day; the dates below already reflect that.
Next deadline: Friday, January 15, 2027 — Fourth-quarter 2026 estimated tax payment.
January 2027
Fourth-quarter 2026 estimated tax payment
Self-employed people and others who pay estimated tax · Federal & Pennsylvania
February 2027
W-2s and 1099-NEC due to workers and to the government
Employers and businesses that paid contractors · Federal
March 2027
Partnership (Form 1065) and S corporation (Form 1120-S) returns, or extension
Partnerships, multi-member LLCs and S corporations · Federal
April 2027
Individual returns (Form 1040 and PA-40), or extension
Individuals · Federal & Pennsylvania
C corporation returns (Form 1120), or extension
Calendar-year C corporations · Federal
First-quarter 2027 estimated tax payment
Self-employed people and others who pay estimated tax · Federal & Pennsylvania
Last day for 2026 IRA and HSA contributions
Individuals · Federal
June 2027
Second-quarter 2027 estimated tax payment
Self-employed people and others who pay estimated tax · Federal & Pennsylvania
September 2027
Third-quarter 2027 estimated tax payment
Self-employed people and others who pay estimated tax · Federal & Pennsylvania
Extended partnership and S corporation returns
Businesses that filed an extension in March · Federal
October 2027
Extended individual and C corporation returns
Anyone who filed an extension in April · Federal & Pennsylvania
January 2028
Fourth-quarter 2027 estimated tax payment
Self-employed people and others who pay estimated tax · Federal & Pennsylvania
General information, not advice for your situation. The IRS can postpone deadlines for disaster areas; check IRS disaster relief and the Pennsylvania Department of Revenue.