US tax season checklist 2026: IRS deadlines, documents, and deductions for freelancers and small businesses

Tax season 2026 is underway, and if you're a freelancer or small business owner, you need a clear small business tax preparation checklist to stay organized and maximize deductions. This US tax season checklist 2026 for freelancers covers all essential IRS deadlines 2026, required documents, and actionable steps to file your return accurately. Use this checklist in Foco to track each task with automated reminders and priorities.

In the US, deadlines vary by business type: April 15, 2026, is the cutoff for individual returns and LLCs with a standard tax year, while S and C corporations must file by March 15. If you need an extension, Form 4868 grants you until October 15, but remember—this only delays filing, not tax payments due.

Key deductions you shouldn’t miss

Freelancers and small businesses can lower their tax bill with deductions like home office expenses (Form 8829), mileage (58.5 cents per mile in 2026), equipment, software, health insurance premiums, and retirement contributions (SEP IRA or Solo 401(k)). Also deduct marketing costs, professional subscriptions, and bank fees.

• Gather all 1099-NEC forms received from clients for payments over $600 in 2025
• Collect receipts and bank statements for deductible expenses (office supplies, equipment, travel, business meals)
• Calculate total mileage for the year using detailed logs (date, purpose, miles driven)
• Check eligibility for the home office deduction (requires exclusive and regular business use of space)
• Review credit card and bank statements to identify overlooked deductible expenses
• Organize utility, internet, and phone bills if they apply to business use
• Gather investment documents (1099-INT, 1099-DIV, 1099-B forms) and cryptocurrency transaction records
• Prepare records of retirement contributions (SEP IRA, Solo 401(k), traditional or Roth IRA)
• Verify if you need to file Form 1040-ES for 2026 quarterly estimated tax payments (deadlines: April 15, June 15, September 15, and January 15, 2027)
• Review W-9 forms for independent contractors to ensure tax info is up to date
• Calculate self-employment tax (15.3% on 92.35% of net earnings)
• Prepare Form 8829 if claiming the home office deduction (requires measuring square footage)
• Review Schedule C to report business income and expenses (include advertising, insurance, and depreciation)
• Check eligibility for the Earned Income Tax Credit (EITC) or Child Tax Credit
• Consult a tax professional if your business had losses to apply the Net Operating Loss (NOL) rule
• Prepare Form 4562 if depreciating business equipment or vehicles
• Review Form 1099-K if you received payments via platforms like PayPal or Stripe (reporting threshold: $20,000 and 200 transactions in 2025)
• Save digital copies of all documents in a secure folder (use Foco tags to categorize them)
• Set reminders in Foco for key IRS deadlines 2026, quarterly payments, and extension filings if needed
• Review the final return with a professional before submitting to avoid errors and penalties