#tax-deadlines
Tax Deadlines
Important tax filing deadlines and compliance dates to remember
The 83(b) Election: A 30-Day Decision That Can Save Founders Six Figures in Taxes
A Section 83(b) election lets founders and early employees pay ordinary income tax on the grant-date value of restricted stock instead of on each vesting tranche, shifting future appreciation into long-term capital gains. The 30-day filing window is absolute and starts on the actual transfer date.
How to Prepare for Tax Season: A Year-Round Checklist for Small Business Owners
A practical week-by-week, quarter-by-quarter, and year-end tax preparation checklist for small business owners — covering 2026 IRS deadlines, estimated tax payments, deductions, 1099 filing, and the bookkeeping habits that turn April from a sprint into a routine handoff.
Form 1120-W and C Corporation Estimated Taxes: The Complete 2026 Guide
Form 1120-W was retired after 2022, but C corporations expecting to owe more than $500 in federal tax must still make quarterly estimated payments. This guide covers the 2026 due dates, the 21% rate calculation, the two safe harbors, the $1 million large-corporation trap, the annualized income installment method, and the EFTPS-only payment requirement.
Form 1120-S Explained: The Complete Guide to Filing Your S Corporation Tax Return
Form 1120-S is the annual federal return every active S corporation must file, with a 2026 deadline of March 16. This guide covers who must file, the schedules involved, the five mistakes that cost owners the most, and a month-by-month filing workflow.
What Happens If You Don't File Your LLC Taxes? Penalties, Consequences, and Fixes for 2026
A four-member LLC that files Form 1065 six months late owes about $6,240 in federal penalties before any state assessment. This 2026 guide details every federal and state penalty an LLC can face for non-filing, the cascade of secondary consequences, and the step-by-step path back to good standing — including how First-Time Abate can wipe out the entire federal penalty in a single phone call.
LLC Tax Filing Deadlines 2026: A Complete Calendar by Entity Type
A 2026 calendar of LLC tax deadlines by IRS classification — single-member LLCs file Schedule C on April 15, multi-member partnerships and S-corps file Forms 1065 and 1120-S on March 16, C-corps file Form 1120 on April 15. Covers Form 7004 extensions, quarterly estimates, and the $245-per-partner late-filing penalty.
Penalty for Filing Taxes Late: What You Owe and How to Reduce It
The IRS charges 5% per month for late filing (capped at 25%) plus 0.5% per month for late payment, with daily-compounding interest at 7% in Q1 2026. This guide details how each penalty is calculated and four programs — First-Time Abatement, reasonable cause, installment agreements, and Offer in Compromise — that can reduce or remove what you owe.
When Can You File Taxes? The Complete 2026 Filing Season Timeline
The IRS opens the 2026 filing season on January 26, with W-2s and most 1099s due by January 31. Filing early protects against refund fraud, speeds direct-deposit refunds within 21 days, and beats the April rush — but waiting can be smarter when K-1s or corrected brokerage 1099s are still in transit.
Form 1120: The Complete C Corporation Tax Return Guide for 2026
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.
How to File a Tax Extension: Complete Guide to Forms 4868 and 7004
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.
Partnership Tax Deadlines 2026: Form 1065, K-1s, and the Penalties You Can't Afford to Miss
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.
W-9 vs 1099: What Every Business Hiring Contractors Needs to Know
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.