Last-Minute Tax Filing Checklist Before April 15
Tax day is April 15, 2026. If you're a small business owner or freelancer and you haven't filed yet, don't panic, but don't wait either. Here's everything you need to check off before you hit submit. This isn't a tutorial on how taxes work. It's a get-it-done checklist for people who know the basics and just need to make sure nothing falls through the cracks.
Documents You Need
Before you start, gather these. Missing one document is the #1 reason people delay filing:
- W-2s from any employer (should have arrived by January 31).
- 1099-NECs from clients who paid you $600+ as a contractor.
- 1099-INTs and 1099-DIVs from banks and brokerages.
- 1099-Ks from payment platforms if you crossed the reporting threshold.
- 1098 for mortgage interest.
- Records of estimated tax payments made during 2025.
- Business expense records. receipts, mileage logs, software subscriptions, home office calculations.
- Health insurance Form 1095-A if you bought marketplace coverage.
- Prior year tax return for reference.
If You're a Sole Proprietor or Freelancer
These are the forms you'll file: Schedule C (profit and loss), Schedule SE (self-employment tax), Form 1040-ES records (quarterly payments you already made), and Form 8829 if you're claiming the home office deduction using the actual expense method.
Double-check that your net profit on Schedule C matches your records. This number drives both your income tax and self-employment tax.
Deductions to Double-Check
These are the ones business owners and freelancers most commonly miss:
- Home office: $5/sq ft simplified method, up to 300 sq ft = $1,500 max. Or use actual expenses for a potentially larger deduction.
- Vehicle mileage: 70 cents/mile for 2025 returns. 10,000 business miles = $7,000 deduction.
- Health insurance premiums: If self-employed and not eligible for employer coverage, 100% deductible above the line.
- Retirement contributions: SEP-IRA contributions can be made up to your filing deadline, including extensions. You still have time.
- Software and subscriptions: Every business tool you pay for is deductible.
- New OBBBA deductions: Qualified tips (up to $25,000), qualified overtime (up to $12,500 single / $25,000 joint), and auto loan interest (up to $10,000).
Can't File by April 15? File an Extension.
Form 4868 gives you an automatic six-month extension to file (new deadline: October 15, 2026). But an extension to file is not an extension to pay. You still owe any taxes due by April 15. Estimate what you owe, pay it, and file the full return later.
Key Deadlines for 2026
| Date | What's Due |
|---|---|
| April 15, 2026 | 2025 return (or extension + payment) |
| April 15, 2026 | Q1 2026 estimated payment |
| June 15, 2026 | Q2 2026 estimated payment |
| September 15, 2026 | Q3 2026 estimated payment |
| October 15, 2026 | Extended 2025 return due |
| January 15, 2027 | Q4 2026 estimated payment |
Before You Hit Submit
Final checks: bank account and routing number correct, filing status matches your situation, SSNs correct for you and dependents, all income sources accounted for, you've chosen the better option between standard deduction and itemized (the new $40,400 SALT cap may make itemizing worthwhile), return is signed and dated, and you've saved a copy for your records.
Frequently Asked Questions
What happens if I file late?
If you owe and don't file or extend by April 15, the failure-to-file penalty is 5% of unpaid taxes per month, up to 25%. If you're getting a refund, there's no penalty, but file to get your money.
Can I still contribute to a SEP-IRA for 2025?
Yes. up to your filing deadline, including extensions. With an extension, you have until October 15, 2026.
Do I need to file if I made less than $12,000?
If you had self-employment income over $400, you must file to pay self-employment tax. even if total income is below the standard deduction.
Should I file myself or hire someone?
If you're a sole proprietor with straightforward income and expenses, tax software handles it fine. If you have an S-Corp, multiple income streams, or significant complexity, a CPA is worth the cost.