Self-Employment Tax Guide 2026: What to Pay and When

When you work for an employer, payroll taxes are split between you and your company. When you''re self-employed, you pay both halves yourself. Understanding how self-employment tax works — and when to pay it — is essential to avoiding costly penalties.

What Is Self-Employment Tax?

Self-employment (SE) tax covers Social Security and Medicare contributions for people who work for themselves:

• Social Security: 12.4% (on net earnings up to $176,100 in 2026)
• Medicare: 2.9% (on all net earnings)
• Total SE tax rate: 15.3%

If your net earnings exceed $200,000 (single) or $250,000 (married filing jointly), an additional 0.9% Medicare surtax applies.

How SE Tax Is Calculated

SE tax applies to your net self-employment earnings — that''s business income minus business expenses.

Example:

• Gross freelance income: $80,000
• Business expenses: $15,000
• Net SE earnings: $65,000
• SE tax base (92.35% of net): $60,028
• SE tax owed: $60,028 × 15.3% = $9,184

You multiply by 92.35% first because you can deduct the "employer half" of SE tax before calculating.

The SE Tax Deduction

The IRS lets you deduct half of your SE tax as an above-the-line deduction on your Form 1040. This partially offsets the burden of paying both halves yourself.

In the example above, you''d deduct $9,184 / 2 = $4,592 from your gross income.

Quarterly Estimated Tax Schedule for 2026

Self-employed individuals don''t have an employer withholding taxes. Instead, you''re required to make quarterly estimated payments:

Missing these deadlines triggers an underpayment penalty, even if you pay everything by April 15.

How to Calculate Quarterly Payments

Use Form 1040-ES to estimate your quarterly payments. The simplest approach:

1. Estimate your annual net self-employment income
2. Calculate SE tax (net income × 0.9235 × 0.153)
3. Estimate your income tax liability (apply your bracket)
4. Total owed = SE tax + income tax − any withholding from W-2 jobs
5. Divide by 4 for each quarterly payment

Safe harbor rule: You avoid penalties if you pay either:

• 90% of your current year tax, OR
• 100% of last year''s tax (110% if last year''s AGI exceeded $150,000)

The safe harbor based on last year''s tax is easier to calculate and widely used.

How to Pay

The IRS offers several payment methods:

• IRS Direct Pay (IRS.gov): Free bank account transfer, no registration required
• EFTPS (Electronic Federal Tax Payment System): Free, best for regular quarterly payers
• IRS2Go app: Mobile-friendly direct pay
• Credit/debit card: Available through IRS-authorized processors (small fee applies)
• Check by mail: Pay to "United States Treasury," include Form 1040-ES voucher

Schedule C Overview

Self-employed income and expenses are reported on Schedule C (Profit or Loss from Business), which attaches to your Form 1040.

Key sections:

• Part I – Income: Total gross receipts
• Part II – Expenses: Deductible business costs (advertising, supplies, vehicle, home office, software, etc.)
• Part IV – Vehicle info: If you deduct vehicle expenses
• Net profit (or loss): Flows to your 1040 and triggers SE tax

Keep detailed records throughout the year. Good bookkeeping makes Schedule C fast and accurate.

What Happens If You Underpay?

The IRS charges an underpayment penalty calculated as a percentage of the shortfall, based on the federal short-term interest rate plus 3%. For 2026, this is typically 7-8% annualized.

The penalty applies quarter by quarter — paying one big lump sum in April doesn''t retroactively satisfy missed Q1-Q3 deadlines.

Tools to Manage Quarterly Taxes

• QuickBooks Self-Employed: Tracks income/expenses, estimates quarterly taxes
• FreshBooks: Invoicing + basic tax estimates
• Keeper: Specifically designed for freelancers and 1099 workers
• Spreadsheet: A simple income-expense tracker works fine if you stay disciplined

Set aside 25-30% of every payment you receive in a dedicated savings account. When quarterly deadlines hit, the money is already there.