The U.S. tax year aligns with the calendar year, but the tax window is much longer. Some actions must be taken by December 31. Others stay open until April 15, or even October 15. Knowing which is which is worth several thousand dollars to a typical gig worker.
December actions (must complete by Dec 31)
1. Max out retirement contributions where the deadline is December 31
For the most part, the employee-side elective deferral for a Solo 401(k) must be designated by December 31 (though the actual deposit can be made by your tax filing deadline). If you're going to put $23,500 in your Solo 401(k), tell your provider before year-end.
- Solo 401(k) employee deferral: $23,500 ($31,000 if 50+)
- SIMPLE IRA: $16,500 employee deferral ($20,000 if 50+)
- 401(k) at a W-2 day job: ask payroll for extra deferral on remaining paychecks
2. Capture all business expenses before year-end
If you're a 1099 worker, the IRS only credits expenses paid in the tax year (cash basis). Consider accelerating purchases before December 31:
- New phone for business use (deductible at business-use %)
- Vehicle maintenance and repairs (deductible via mileage rate OR actual expense)
- Supplies, uniforms, professional development
- Pre-pay January's car insurance if cash-basis tax helps you this year
Don't buy things you don't need just for the deduction — a $1,000 deduction at 22% saves $220, you're still out $780. But if you needed it anyway, doing it in December instead of January matters.
3. Make charitable contributions
Only useful if you itemize (most people don't). For the 88% of filers using the standard deduction, charitable contributions don't affect taxes. If you're close to the itemize threshold ($15,750 single / $31,500 MFJ), bunching multiple years of donations into one year can push you over.
Donor-advised funds (Fidelity Charitable, Schwab Charitable, Vanguard Charitable) let you bunch years of contributions into one tax year while distributing to charities over time.
4. Pre-pay state estimated tax (advanced)
State income tax paid in 2026 is deductible on your 2026 federal return (if you itemize and aren't blocked by the $10,000 SALT cap). Paying your Q4 state estimate in December rather than January pulls the deduction into the earlier year.
5. Defer income if you can
If you're a 1099 worker with discretion over when clients pay, deferring a December payment into January shifts the income (and the tax) by a full year. Only useful if you expect to be in the same or lower tax bracket next year.
6. Tax-loss harvesting
If you have investments in a taxable account, selling losers before year-end captures the loss for tax purposes. You can offset capital gains plus an additional $3,000 of ordinary income per year. Wash-sale rule: don't buy substantially identical securities within 30 days.
January and February: the waiting game
What arrives
By January 31, payers must send you their tax documents:
- W-2 from each W-2 employer
- 1099-NEC from each 1099 payer ($600+)
- 1099-K from payment processors ($2,500+ for 2026)
- 1099-INT from banks for savings interest
- 1099-DIV / 1099-B from brokerages
- 1095-A from the ACA marketplace if you had marketplace health insurance
By February 15, you should have everything. If not, contact the payer. If they refuse, you can still file using your own records.
Documents to gather
- Last year's tax return (for reference and for tax software import)
- Your daily tip log and shift records (your own version, not just employer's)
- Mileage log (auto-tracking app export, or your handwritten log)
- Business expense receipts and bank/credit card statements
- HSA / retirement contribution statements (5498)
- Student loan interest statement (1098-E) if you have one
- Mortgage interest statement (1098) if you own and itemize
Pre-filing review (March)
1. Income reconciliation
Add up all your tax documents. Compare to your own records. Are you reporting:
- Every W-2's Box 1 + reported tips Box 7
- Every 1099 (NEC and K, separately)
- Any cash tips not on the W-2
- Any side income that didn't generate a 1099 (under $600 from a single payer, but still taxable)
2. Deduction capture
- Mileage: total business miles × $0.70 = mileage deduction (or actual expense method)
- Home office: dedicated business space × home expenses, or $5/sq ft simplified up to 300 sq ft
- Phone: business-use % × annual phone cost
- Self-employed health insurance premiums
- Half-SE-tax deduction (automatically computed by software)
- SEP/Solo 401(k) employer-side contributions (still time until tax filing deadline)
3. Mileage log audit
If you have a 1099 with significant vehicle expenses, the IRS is increasingly focused on mileage substantiation. Spot-check 5-10 random days against credible cross-references (calendar, app history, bank deposits). Reconstructed-after-the-fact logs are an audit target.
Final estimated tax payment (January 15)
Q4 estimated tax for tax year 2026 is due January 15, 2027. This is your last chance to make up underpayment from the year. If you haven't met the safe harbor (100/110% of prior year or 90% of current year), this payment can avoid the underpayment penalty.
How to pay: IRS Direct Pay (free, bank transfer), EFTPS (federal), or Form 1040-ES voucher with check. Check arrives by mail; allow 7-10 days for processing.
Choosing a tax pro
DIY is fine if: simple W-2 with maybe a small 1099, no investments to speak of, no rental property. Use FreeTaxUSA, IRS Free File, or IRS Direct File.
Hire a pro if: multiple state filings, significant 1099 income, business with employees, rental property, complex investments, or you got an IRS notice last year. CPAs and EAs (Enrolled Agents) both handle individual returns; EAs are often cheaper and specialize in tax. Expect $200-$600 for a moderately complex return.
Ask about: experience with tipped workers / gig workers specifically, fee structure (flat vs hourly), audit support if your return triggers a notice.
The April 15 deadline
For tax year 2026, the federal deadline is April 15, 2027 (April 17 if weekend/holiday observance applies). If you can't file by then, file Form 4868 for an automatic six-month extension to October 15. But — the extension is to FILE, not to PAY. Estimated tax owed is still due April 15. The failure-to-pay penalty is much smaller than the failure-to-file penalty, but interest accrues either way.