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

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 $72,000 to a SEP IRA. Contributions are fully deductible above-the-line, reducing your adjusted gross income.

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.

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: $4,400 (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.

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

Deep Dive: Cash vs. Accrual Method and Why December 31 Is the Deadline

Almost every sole proprietor and single-member LLC files on the cash method of accounting. Under cash basis, you recognize income when you actually or constructively receive it, and you deduct expenses when you actually pay them. That single rule is the engine behind every move in this article: a check received December 30 is 2026 income; a check received January 2 is 2027 income. An expense paid December 31 is a 2026 deduction; the same expense paid January 2 waits a full year.

The catch is the constructive receipt doctrine. You cannot dodge 2026 income by simply refusing to pick up a check that was available to you before year-end, or by asking a client to "hold" a payment you were already entitled to. If the money was credited to your account, set aside, or otherwise made available to you in 2026, it is 2026 income regardless of when you deposit it. Conversely, a valid, unbilled, unearned invoice dated in January is genuinely 2027 income.

Worked Example — The December 28 Equipment + SEP Decision

Nina is a freelance designer with $90,000 net Schedule C profit through November. She has $5,000 of equipment to buy and wants to fund a SEP IRA. Here is the side-by-side:

By spending $5,000 she needed anyway and shifting $15,000 of savings into a retirement plan, Nina keeps over $7,000 more of her money working for her instead of the IRS — and the SEP dollars compound tax-deferred for retirement.

Common Year-End Planning Mistakes

• Deferring income but forgetting quarterly payments. If you lower 2026 income by deferring, make sure your Q4 estimated payment still covers what you owe, or you may trigger an underpayment penalty.
• Prepaying more than 12 months. The 12-month rule disallows prepayments that extend beyond 12 months from the payment date.
• Claiming a home office you don't use exclusively. The space must be used regularly and exclusively for business; a dining table you also eat at fails the test.
• Buying equipment you don't need. A deduction is not free money — you spend $1 to save roughly $0.30–$0.38. Never buy to "save tax" on money you wouldn't otherwise spend.
• Missing the SEP vs. Solo 401(k) deadline difference. A SEP can be funded until the tax-filing deadline (including extensions), but employee Solo 401(k) deferrals must be made by December 31.
• Assuming QBI is automatic. The 20% QBI deduction requires a valid computation on Form 8995/8995-A; it is not a checkbox.

Step-by-Step: Your November–December Action Plan

Step 1 — Project your year-end numbers (early November)

Add YTD income and expenses, estimate December, and compute projected net profit with our Tax Calculator.

Step 2 — Run the retirement math

Determine your max SEP IRA (25% of net SE income, cap $72,000) or Solo 401(k) employee deferral ($23,500 for 2025). Set up the account if you haven't.

Step 3 — Schedule needed purchases

Buy and place-in-service equipment, and prepay allowable 12-month expenses, before December 31.

Step 4 — Decide on income timing

If beneficial and permissible, delay unbilled invoices to January. Confirm no constructive receipt issue.

Step 5 — Reconcile estimated payments

Recompute quarterly payments so you avoid an underpayment penalty, and make the Q4 payment (or push to Dec 31 for SALT purposes if itemizing).

Cross-References: Build the Full Plan

• SEP IRA Tax Savings — The single biggest lever for most freelancers: SEP IRA Guide.
• Equipment Write-Off — Section 179, bonus, and de minimis mechanics: Equipment Guide.
• Mileage Deduction — Finish your log so every business mile counts: Mileage Guide.
• Underpayment Penalty — Avoid the trap when you shift income: Penalty Guide.
• Quarterly Estimates — Keep payments on track all year: Quarterly Calculator.

Frequently Asked Questions