What is the most important year-end tax move for self-employed workers?

Maximizing retirement contributions (SEP IRA or Solo 401k) is typically the highest-impact move. For 2026, SEP IRA contributions up to 25% of net SE income (max $70,000) are fully deductible above the line.

Can self-employed workers defer income to next year?

Yes, under the cash method of accounting, income is taxable when received. Delaying invoices or payments to January 2027 shifts that income to 2027 — but constructive receipt rules apply if payment has already been tendered.

📅 Last reviewed: June 2026 🏷️ Tax Planning 📖 ~2,600 words

10 Year-End Tax Moves for Self-Employed Workers Before December 31, 2026

Once January 1 arrives, most tax-saving opportunities disappear. As a self-employed worker or 1099 contractor, you have more levers to pull than a W-2 employee — but only if you act before the year ends. Here are 10 concrete moves to make before December 31 to lower your 2026 tax bill.

Why Year-End Planning Matters More for the Self-Employed

W-2 employees have taxes withheld automatically. You don't. That means you've been accumulating a tax liability all year — and now is the last chance to reduce it legally. Every dollar of deductions you can legitimately claim reduces both SE tax (15.3%) and federal income tax simultaneously.

Move #1: Max Out Your SEP IRA or Solo 401(k) Contribution

Deadline: April 15, 2027 (SEP IRA); December 31, 2026 (Solo 401k contributions).

For 2026, you can contribute up to 25% of net self-employment income, up to $70,000 to a SEP IRA. Contributions are fully deductible above-the-line, reducing your adjusted gross income.

Net SE profit: $100,000
Max SEP IRA contribution (approximately): $18,587
Tax savings at 24% federal + 14.13% SE = 38.13% combined rate: $18,587 × 38.13% ≈ $7,089 saved

Use our SEP IRA Tax Savings Calculator blog for detailed examples.

Move #2: Buy Business Equipment Before Year End (Section 179)

Any qualifying business equipment placed in service by December 31 can be deducted fully under Section 179 (up to $1,220,000 in 2026) or partially under 20% bonus depreciation.

Need a new laptop, camera, desk, or specialized tool? Buying it before December 31 vs. January 1 means a full extra year of deduction benefit.

Move #3: Prepay Deductible Business Expenses

Under the cash method of accounting (used by most self-employed individuals), you deduct expenses in the year they are paid — not when you receive the service. You can prepay 2027 business expenses in December 2026 to accelerate deductions.

Renew annual software subscriptions in December (vs. January)
Pay Q1 2027 professional dues now
Pre-purchase supplies you'll need in early 2027
Pay estimated insurance premiums covering 2027

Limitation: The 12-month rule applies — you can only prepay up to 12 months in advance and the benefit period cannot extend beyond 12 months from the prepayment date.

Move #4: Make Your Q4 Estimated Tax Payment Early

Q4 estimated taxes are normally due January 15, 2027. But if you pay by December 31, 2026, you may be able to deduct any state estimated taxes paid as an itemized deduction on your 2026 federal return (subject to SALT cap of $10,000).

Move #5: Defer Year-End Invoices (If Income Is High)

If you're approaching a higher tax bracket or expect lower income next year, consider delaying sending final invoices of the year until after December 31. Under the cash method, income is recognized when received — so income received in January 2027 is taxed in 2027, not 2026.

⚠️ Important: Only defer income you haven't yet billed. Constructive receipt rules mean if you have a right to receive income (e.g., client has paid, check is in the mail), it may be taxable in 2026 regardless of when you deposit it.

Move #6: Review Your Home Office Deduction

If you work from home, you're entitled to a home office deduction for the space used regularly and exclusively for business. Two methods:

Simplified: $5 × square footage (max 300 sq ft = $1,500)
Actual expense: Percentage of home costs (rent/mortgage interest, utilities, insurance)

Measure your dedicated workspace now and decide which method gives you a larger deduction.

Move #7: Write Off Any Bad Business Debts

If a client owes you money and it's clear they won't pay, you can deduct a business bad debt on Schedule C. The debt must be a result of your business (not a personal loan). You must have previously included the income in your gross income.

Document your collection attempts (emails, invoices, demand letters) before year end as supporting evidence for the deduction.

Move #8: Take Your Last Business Travel Deduction This Year

Business travel expenses — flights, hotels, 50% of meals — are deductible when business related. If you have a legitimate business trip planned for early 2027, consider moving it to December 2026 to accelerate the deduction.

Move #9: Contribute to HSA (If Eligible)

If you have a High-Deductible Health Plan (HDHP), you can contribute to a Health Savings Account (HSA) up to the annual limit:

Self-only coverage: $4,300 (2026)
Family coverage: $8,550 (2026)
Age 55+ catch-up: +$1,000

HSA contributions are deductible above-the-line, tax-free when used for qualified medical expenses, and grow tax-free. They're often called a "triple tax advantage."

Move #10: Review QBI Deduction Eligibility

The Section 199A Qualified Business Income (QBI) deduction allows eligible self-employed workers to deduct up to 20% of qualified business income from their taxable income. This is a significant deduction that doesn't appear on Schedule C — it shows up directly on Form 1040.

Limitations: The QBI deduction phases out for specified service businesses (attorneys, consultants, financial advisors) at higher income levels ($197,300 single / $394,600 married filing jointly in 2026). W-2 wage limitations may also apply.

QBI Estimate: For a self-employed person with $80,000 net profit:
QBI deduction ≈ 20% × $80,000 = $16,000 (reduces taxable income directly on Form 1040)

Quick Year-End Checklist

☐ Calculate projected year-end net profit — use our Tax Calculator
☐ Maximize retirement contributions (SEP IRA / Solo 401k)
☐ Review mileage log for completeness
☐ Purchase any needed business equipment before Dec 31
☐ Prepay legitimate business expenses
☐ Verify home office square footage and method
☐ Send final 2026 invoices or defer strategically
☐ Make HSA contributions if eligible
☐ Review QBI deduction eligibility
☐ Document any outstanding business debts