The federal date that applies to you depends on what is being filed, your federal tax classification, whether a timely extension was accepted, and whether you use a calendar or fiscal year. This hub separates 2025 returns filed during 2026 from estimated payments for 2026 income, shows the next common dates first, and points to the detailed schedule for each type of filer.
Next federal tax deadlines in 2026
As of July 24, 2026, these are the next principal federal dates in this calendar. The same date can cover different obligations, so identify both the taxpayer and the form before acting.
| Date | Who may be affected | General federal obligation |
|---|---|---|
| Individuals, corporations, partnerships, and S corporations | Third 2026 estimated installment where required; extended 2025 Forms 1065 and 1120-S | |
| Individuals and calendar-year C corporations | Extended 2025 Forms 1040 and 1120 when a timely, valid extension applies | |
| Calendar-year corporations | Fourth 2026 corporate estimated-tax installment where required | |
| Calendar-year individuals | Fourth 2026 individual estimated-tax installment where required |
An extension generally changes a filing date, not the regular payment date. State, fiscal-year, disaster-relief, payroll-deposit, and fact-specific dates can differ.
Find the dates that apply to you
Choose the federal filing classification or issue that matches your situation. An LLC is a state-law entity type; its federal return and deadline depend on whether it is treated as a disregarded entity, partnership, S corporation, or C corporation.
- Individual or sole proprietorReview the 2026 estimated-payment schedule and the October 15 individual extension deadline.View relevant dates
- Partnership or partnership-taxed LLCReview Form 1065, Schedule K-1, and the September 15 extended filing date.View relevant dates
- S corporationReview Form 1120-S, Schedule K-1, extension, and Form 2553 distinctions.View relevant dates
- C corporationReview Form 1120, extension, fiscal-year, and corporate estimated-payment dates.View relevant dates
- LLC with uncertain tax classificationStart by identifying how the LLC is treated for federal income-tax purposes.View relevant dates
- Employer or business issuing tax formsReview payroll support if Forms W-2, information returns, or recurring payroll filings are involved.View relevant dates
2026 federal tax calendar at a glance
This table lists selected dates commonly relevant to the individuals and small businesses Tavella CPA Group serves. It is deliberately narrower than the full IRS tax calendar and does not list recurring payroll deposits, every information return, excise taxes, or state and local obligations.
| Date | General obligation | Tax year or period |
|---|---|---|
| Fourth individual estimated-tax installment | 2025 income | |
| Forms W-2 and applicable Forms 1099-NEC generally due after the weekend adjustment | 2025 wages or reportable payments | |
| Calendar-year Forms 1065 and 1120-S, with required Schedules K-1 | 2025 returns | |
| Most Forms 1040 and calendar-year Forms 1120; extension requests; first 2026 individual and corporate estimates | 2025 returns and 2026 estimates | |
| Second individual and corporate estimated-tax installment where required | 2026 income | |
| Third individual and corporate estimate; extended calendar-year Forms 1065 and 1120-S | 2026 income and 2025 returns | |
| Extended Forms 1040 and calendar-year Forms 1120 with timely, valid extensions | 2025 returns | |
| Fourth corporate estimated-tax installment where required | 2026 income | |
| Fourth individual estimated-tax installment where required | 2026 income |
Dates shown are general federal dates for ordinary calendar-year situations. A weekend or legal holiday can move a due date, and special rules can create a different result.
Dates occurring in 2026 can cover two different tax years
A return filed during 2026 usually reports a tax year that ended in 2025. By contrast, quarterly estimated payments due during 2026 generally prepay federal tax on income earned in 2026. The January 15, 2027 installment also generally belongs to 2026 income.
Keep the return year, payment year, taxpayer name, and confirmation number with every filing or payment. Selecting the wrong year can create an apparent balance or missing-payment notice even when money was sent.
Extensions and estimated payments solve different problems
A timely, valid Form 4868 or Form 7004 generally extends the time to file the applicable return. It generally does not extend the regular time to pay tax. The detailed individual and business deadline pages explain the common extension dates without duplicating them here.
Estimated-payment dates also do not determine the amount due. Individuals should use Form 1040-ES and applicable guidance; corporations follow separate corporate estimated-tax rules. State calculations and schedules can differ.
State, sales-tax, fiscal-year, and disaster dates require separate checks
State income-tax extensions, estimated payments, franchise taxes, and sales-tax returns do not follow one nationwide calendar. Sales-tax filing frequency can depend on the jurisdiction and account, while a fiscal-year or short-year federal return is generally tied to the actual tax-year ending date.
The IRS can postpone specified deadlines for eligible taxpayers affected by a federally declared disaster. Confirm the covered taxpayer, location, form, payment, and relief period in the applicable IRS notice, and then review state relief separately.
What to do if a deadline may have been missed
Filing, payment, estimate, payroll, information-return, and state obligations should be reviewed separately. Penalties, interest, and available relief depend on the actual facts and should not be estimated from a general calendar alone.
- Confirm the taxpayer, form, tax year, original deadline, and whether a filing or extension was accepted
- Locate payment confirmations, mailing records, e-file acknowledgments, and any IRS or state notices
- Identify which items are still missing and bring the return or payment calculation current
- Check applicable disaster relief or another specific exception instead of assuming it applies
- File or respond as soon as accurate information is available; do not wait for the next calendar date