#tax-deadlines
Important tax filing deadlines and compliance dates to remember
Form 1120 is the annual U.S. Corporation Income Tax Return every domestic C corporation must file, even in zero-income years. A 2026 walkthrough of deadlines, schedules C through M-2, estimated tax rules, and the eight most common filing mistakes.
A tax extension buys six months to file, not to pay. This guide explains exactly how to file Form 4868 (individuals) and Form 7004 (businesses), how to estimate a good-faith payment, and the state-level traps that cost filers real money.
Calendar-year partnerships must file Form 1065 and issue Schedule K-1s by March 16, 2026. Late filing costs $255 per partner per month, up to 12 months. This guide covers every federal deadline, Form 7004 extensions, quarterly estimates, and the Rev. Proc. 84-35 safe harbor for small partnerships.
Form W-9 collects a contractor's taxpayer ID at onboarding; Form 1099 reports year-end payments to the IRS. The 2026 filing threshold rises from $600 to $2,000 under the OBBBA, and missing a W-9 triggers 24% backup withholding immediately — plus penalties of up to $660 per late form.
A practical breakdown of what the IRS does when you skip a tax return—5% monthly failure-to-file penalty, Substitute for Return, liens, levies, passport revocation, and the step-by-step path back to compliance.
A step-by-step guide to filing late, halting penalties, and setting up IRS payment plans after missing April 15—covering the 5% monthly failure-to-file penalty, the 0.5% failure-to-pay penalty, interest at the short-term rate plus 3%, and the three-year window to claim a refund.
Section 174 of the U.S. tax code restored immediate domestic R&D expensing in 2025 under the One Big Beautiful Bill Act, and small businesses have until July 6, 2026 to amend 2022–2024 returns and reclaim refunds on previously capitalized research costs.
How IRS Form 2210 works, when you must file it, the three safe harbors that prevent the underpayment penalty, and how Schedule AI reduces the bill for taxpayers with uneven income. Covers 2026 penalty rates (7% in Q1, 6% in Q2), due dates, and common mistakes.
Form 940 is the IRS return employers use to report annual FUTA tax liability—6% on the first $7,000 of each employee's wages, reducible to 0.6% with timely state unemployment tax payments. Covers who must file, quarterly deposit thresholds, how to claim the state tax credit, Schedule A for multi-state employers, and penalties for late filing.
Form 941 is the quarterly payroll tax return every employer must file—reporting withheld income tax, Social Security, and Medicare. Covers who files, 2026 deadlines, how to complete each section, penalty rates (up to 15% for late deposits), and the $100,000 next-day deposit rule.
The IRS has no grace period for unfiled returns—failure-to-file penalties run 5% per month up to 25%, the statute of limitations never starts on an unfiled return, and refunds expire after three years. Here's what the enforcement timeline looks like and how to get back into compliance.
A step-by-step guide to filing a federal tax extension with Form 4868 or 7004 — including how to estimate what you owe, avoid failure-to-pay penalties, and meet the safe harbor threshold to prevent underpayment charges.
