Federal tax calendar
Use this page as a quick reference for common federal tax filing dates, extension deadlines, business return deadlines, and estimated tax payment dates. State deadlines may be different.
April 15, 2026 is the federal filing deadline for most 2025 individual income tax returns.
October 15, 2026 is the extended filing deadline for many individuals who file a timely federal extension.
Many self-employed taxpayers, investors, landlords, retirees, and business owners need estimated tax payments.
Business tax deadlines
Partnerships and S corporations usually file earlier because owners need Schedule K-1 information before completing their personal returns. C corporations and other entities may have different deadlines depending on entity type and tax year.
March 16, 2026 is the common deadline for 2025 calendar-year partnership returns, Form 1065.
March 16, 2026 is the common deadline for 2025 calendar-year S corporation returns, Form 1120-S.
April 15, 2026 is the common deadline for 2025 calendar-year C corporation returns, Form 1120.
Business extensions generally require timely filing, and any expected tax payment may still be due by the original deadline.
Quick reference
These dates are for common calendar-year federal tax filings. Disaster relief, state law, fiscal years, entity elections, payroll taxes, and other facts may change the applicable deadline.
Fourth quarter 2025 estimated tax payment deadline for many individual taxpayers.
Common deadline for calendar-year partnerships and S corporations.
Major federal tax deadline for individuals, C corporations, extensions, and first estimated payments.
Second quarter 2026 estimated tax payment deadline for many taxpayers.
Important deadline for estimated payments and extended business returns.
Extended deadline for many individual taxpayers who filed a timely extension.
Returns involving business income, rental property, stock sales, bookkeeping, missing documents, IRS notices, or prior-year issues usually require more time than a simple W-2 return.
Collect W-2s, 1099s, K-1s, mortgage statements, brokerage statements, business records, rental property records, and IRS notices before filing.
Bookkeeping, mileage, expenses, payroll, owner draws, contractor payments, and entity classification should be reviewed before business returns are prepared.
If you expect to owe, estimate the balance before the original due date. Filing an extension does not usually extend the time to pay.
If the IRS sent a notice, letter, levy warning, balance due, or missing return notice, address it before more deadlines create additional problems.
What we can help with
PUBLIC TAX, CORP helps individuals and businesses file on time, file properly extended returns, clean up late filings, and respond to IRS issues connected with missed deadlines.
Federal and state personal tax preparation for W-2 employees, self-employed taxpayers, investors, retirees, landlords, and multi-state taxpayers.
Schedule C, 1099-NEC, 1099-K, gig income, app income, expense review, estimated tax awareness, and single-member LLC reporting.
Business return preparation for LLCs, partnerships, S corporations, C corporations, and owners who need Schedule K-1 information for personal filing.
Help with extension planning, document review, estimated balance discussion, and avoiding preventable late-filing issues.
Preparation of prior-year and missing tax returns for individuals, self-employed taxpayers, and business owners who are behind.
Help with IRS notices, penalties, balances due, payment plans, penalty relief, and tax resolution issues caused by missed or late filings.
Quick answers about 2026 federal tax deadlines, extensions, estimated payments, and late filing issues. Click a question to expand.
For most calendar-year individual taxpayers, 2025 federal income tax returns are due April 15, 2026. State deadlines may be different, and special relief may apply in limited circumstances.
No. A tax extension usually gives more time to file, not more time to pay. If you expect to owe federal tax, the balance is generally due by the original tax deadline.
For many calendar-year individual taxpayers, 2026 estimated tax payments are due April 15, 2026, June 15, 2026, September 15, 2026, and January 15, 2027.
For calendar-year partnerships and S corporations, the common 2026 deadline for 2025 returns is March 16, 2026, because March 15, 2026 falls on a Sunday.
Yes. PUBLIC TAX, CORP helps with late returns, unfiled returns, IRS notices, balances due, installment agreements, penalty relief, and tax resolution options.
Service Area
We help individuals, self-employed taxpayers, LLC owners, partnerships, S corporations, C corporations, and taxpayers with IRS notices throughout Tampa Bay and across the United States through a secure remote workflow.
Local office in Dunedin. Tampa Bay service area. Nationwide online tax service available.
Office: Dunedin, FL • Phone: +1 (727) 300-0208
