Self-Employed Tax EstimatorSE tax + credits + quarterly payments, figured out.

Why self-employed workers get surprised at tax time

When a client, platform, or customer pays you, they do not withhold a single dollar for federal tax. The full amount hits your bank account, which feels great in December. Then April arrives and the IRS hands you a bill for 25 to 30 percent of everything you earned. That surprise catches most first-year freelancers, 1099 contractors, and gig workers completely off guard.

The reason the number is higher than you expect: you pay both sides of Social Security and Medicare. A W-2 employee splits the 15.3% payroll tax with their employer, each paying 7.65%. As a self-employed worker, you pay all 15.3% yourself. The IRS calls this self-employment tax. It is calculated on Schedule SE and hits you in addition to federal income tax.

Here is the important distinction this calculator makes: SE tax and federal income tax are two separate calculations. Credits such as the Child Tax Credit and Earned Income Tax Credit can reduce your federal income tax, sometimes to zero or into a refund. They do not reduce your SE tax. A head of household with two qualifying children may owe no federal income tax at all on $42,000 of self-employment income, but still owes the full SE tax of roughly $4,186. Knowing which bucket is which changes how you plan your quarterly payments.

The SE tax formula, step by step

The IRS formula for self-employment tax is not straightforward. Here is exactly how the calculator above works.

1. Start with your gross 1099 income from all gig platforms.
2. Subtract your mileage deduction (miles times $0.76, the current 2026 IRS rate effective July 1) and other business expenses. This is your net SE income.
3. Multiply net SE income by 92.35% (that is 1 minus half of 15.3%). This is your SE base. The IRS allows this reduction because employees only pay tax on 92.35% of their SE income as a proxy for the employer share.
4. Apply 12.4% (Social Security) to the SE base up to the 2026 wage base of $184,500, plus 2.9% (Medicare) on the full SE base. Total SE tax: roughly 15.3% below the wage base.
5. Deduct 50% of your SE tax from your gross income. This is an above-the-line deduction that reduces your adjusted gross income (AGI) for federal income tax purposes.
6. Subtract the standard deduction ($16,100 for single filers in 2026) to get taxable income.
7. Apply the progressive federal brackets. Add state income tax. The total is your annual estimated tax.
8. Divide by four for your quarterly payment.

The 1099-K threshold in 2026

As of 2026, third-party payment platforms are required to issue a 1099-K only if you received more than $20,000 in payments and had more than 200 transactions in the year. This threshold was restored by legislative action after the American Rescue Plan Act temporarily lowered it to $600.

You are still required to report all gig income regardless of whether you receive a 1099-K. The IRS expects every dollar of net profit above $400 on Schedule C.

DoorDash primarily uses a 1099-NEC (non-employee compensation) for driver payments, with the $600 threshold. Uber and Lyft use a mix of 1099-K (for rides) and 1099-NEC (for bonuses and incentives). Whatever form you receive, report the full amount.

When quarterly payments are required

If you expect to owe $1,000 or more in federal tax after subtracting withholding and refundable credits, the IRS expects quarterly estimated tax payments. The 2026 due dates are April 15 (Q1), June 16 (Q2, because June 15 is a Sunday), September 15 (Q3), and January 15, 2027 (Q4).

The safe harbor rule: pay the lesser of 90% of your current year tax owed, or 100% of last year's total tax (110% if your prior year AGI exceeded $150,000). If you pay to the prior-year safe harbor, you will not owe an underpayment penalty even if your current year income is higher than expected.

Deductions most gig workers miss

Beyond mileage, several deductions are commonly overlooked:

• Phone and data plan: The business-use percentage of your monthly plan is deductible. If you use your phone 80% for gig apps, 80% of your monthly bill may be deductible.
• Equipment: Hot bags, coolers, dash cams, phone mounts, and car organizers are deductible in the year purchased.
• Health insurance: If you pay your own health insurance premiums and are not eligible for coverage through a spouse's employer, the premiums may be deductible above the line.
• Self-employed health insurance deduction: Available on Form 1040, not just Schedule C. Reduces AGI directly.

When to consider an S-corp

S-corp election becomes worth evaluating when your net gig profit regularly exceeds $60,000 to $80,000 per year. The structure lets you split income between a reasonable W-2 salary and distributions. You pay payroll tax on the salary but not on distributions, which can reduce your SE tax liability by thousands per year.

Below the break-even, the added cost of payroll, a CPA, and an annual business tax return eats the savings. Above it, the math works in your favor. The S-Corp Savings Calculator shows the exact numbers for your income level.

Worked example: the calculator's own default output

The default scenario ($42,000 gross, 15,000 business miles, $1,500 other expenses, single filer, Texas, no children) breaks down like this:

• Mileage deduction: 15,000 miles × $0.76 = $11,400.
• Net SE income: $42,000 minus $11,400 mileage minus $1,500 other expenses = $29,100.
• SE tax: $29,100 × 92.35% = $26,874 SE base; 15.3% of that is $4,112.
• AGI: $29,100 minus half of SE tax ($2,056) = $27,044.
• Taxable income: $27,044 minus the $16,100 single standard deduction = $10,944, entirely inside the 10% bracket.
• Federal income tax: $1,094. Texas has no state income tax, so total tax owed is $4,112 + $1,094 = $5,206, or $1,302 per quarter.

Switch filing status to head of household with 2 children, same $42,000 gross, and the picture changes sharply even though SE tax stays identical. The HoH standard deduction ($24,150) shrinks taxable income to $2,894, producing only $289 of gross income tax before credits. The $2,200-per-child Child Tax Credit ($4,400 total available) fully offsets that $289, and because the credit exceeds the tax owed, the refundable Additional Child Tax Credit kicks in: 15% of net SE income above $2,500 ($29,100 minus $2,500 = $26,600, times 15% = $3,990), capped at $1,700 per child ($3,400 total). The result: $178 per quarter in SE tax owed, plus a $3,400 refund from the ACTC. SE tax never goes away, since it applies "regardless of credits" as the tool's own section header says, but the federal income tax side can flip from a bill to a refund entirely because of family size and filing status.

When these numbers mislead you

The mileage rate is a flat 76 cents, even for miles driven before July

2026 had a rare mid-year IRS mileage rate change: 72.5 cents per mile from January through June (IRS Notice 2026-10), then 76 cents per mile from July 1 onward (IRS Announcement 2026-11), confirmed directly on the IRS standard mileage rates page. This calculator applies the current 76-cent rate to every mile you enter. If you are estimating a full calendar year and some of those miles were driven in the first half of 2026, your true deduction is smaller than what this tool shows, since those earlier miles only qualify for 72.5 cents. On the default 15,000-mile scenario, if half those miles (7,500) were driven before July 1 at 72.5 cents and half after at 76 cents, the correct blended deduction is $11,138 rather than the flat-rate $11,400 this tool shows, a $263 difference that flows through to a slightly higher SE tax and federal tax bill than the flat-rate estimate suggests.

The state tax estimate uses the top marginal rate, not your actual rate

The state dropdown applies each state's top marginal income tax bracket rate, disclosed directly in the field's own helper text ("we apply the state's top marginal rate as an educational estimate"). Most self-employed people at the $30,000 to $80,000 net-income range this calculator is built around do not actually reach their state's top bracket; state income tax is typically progressive, so lower income is taxed at lower in-state rates first. For a state with meaningfully progressive brackets, this means the calculator's state tax line is a ceiling, not a realistic estimate, and can overstate your true state liability by a noticeable margin at moderate income levels.

Frequently asked questions

How much tax do self-employed workers pay in 2026?

Self-employment tax alone is 15.3% of 92.35% of net earnings (12.4% Social Security up to the $184,500 wage base, plus 2.9% Medicare with no cap). Federal income tax stacks on top at 10% to 37% depending on taxable income and filing status, after the standard deduction. On the calculator's $42,000-gross default scenario for a single filer in a no-income-tax state, total federal tax lands around $5,206 for the year, or $1,302 per quarter.

What can freelancers and 1099 contractors deduct?

Business mileage at the current IRS standard rate, other ordinary business expenses (software, supplies, phone and data plan business-use percentage, equipment), and self-employed health insurance premiums above the line. Half of your self-employment tax is also deductible when computing adjusted gross income, which this calculator applies automatically.

Can the Child Tax Credit reduce my self-employment tax?

No. The Child Tax Credit and its refundable Additional Child Tax Credit only offset federal income tax, never self-employment tax. A parent with $0 federal income tax owed after credits still owes the full SE tax amount. The worked example above shows this directly: $4,112 of SE tax stays fixed at HoH with 2 children, even as the federal income tax side drops to $0 and turns into a $3,400 refund.

Do I need to make quarterly tax payments?

If you expect to owe $1,000 or more in federal tax after credits and withholding, yes. The 2026 due dates are April 15, June 16, September 15, and January 15, 2027. Paying to the safe harbor (90% of current-year tax or 100-110% of last year's tax) avoids an underpayment penalty even if your income ends up higher than expected.

This calculator is designed to provide educational estimates of self-employment tax, federal income tax, and Child Tax Credit based on the inputs you enter. Results are not tax advice and should not be used as a substitute for guidance from a qualified tax professional. Child Tax Credit and Additional Child Tax Credit eligibility and amounts depend on your specific circumstances including the child's age, relationship, residency, and your income level. EITC eligibility shown is a rough flag only based on income and family size. Always verify with a tax professional or IRS EITC Assistant. Tax laws may have changed since this calculator was last updated. The mileage rate and tax constants used reflect 2026 published IRS figures. State income tax estimates are provided as a general reference and may not reflect your actual state tax liability. Always verify quarterly estimated tax amounts with IRS Form 1040-ES or a qualified tax preparer. See our Terms for the full disclaimer.