1099 Tax Calculator

No. This is an educational estimate using 2024 federal tax brackets, standard deductions, and Social Security figures, the most recent numbers available, not a substitute for advice from a CPA or tax professional. The IRS adjusts brackets and deduction amounts for inflation every year, and this calculator uses a simplified Qualified Business Income deduction that does not model the phase-outs that apply to some business types at higher income levels, so treat the result as a planning estimate, not a filing-ready figure.

When you're a W-2 employee, your employer pays half of your Social Security and Medicare tax and withholds your half from your paycheck automatically. As a 1099 contractor, there's no employer to split that with, so you owe the full 15.3% yourself: this is self-employment tax, and it's calculated and paid separately from, and in addition to, your regular federal income tax.

Self-employment tax is calculated on 92.35% of your net profit rather than the full amount, which roughly mirrors how a W-2 employee's wages are the amount left after their employer's half of payroll tax, something a self-employed person doesn't have a separate employer to pay. It's a fixed adjustment set by the IRS, not something you can opt out of.

Since the self-employment tax already covers what would otherwise be an employer's share of payroll tax, the IRS lets you deduct that half from your income before calculating your regular income tax, so you're not effectively taxed twice on the same amount. This deduction reduces your adjusted gross income (AGI), not your self-employment tax itself.

It's a deduction of up to 20% of your qualified business income, available to many self-employed people and small business owners, on top of the standard deduction. The real rules get complicated at higher income levels and for certain service businesses (law, accounting, consulting, and similar fields face phase-outs), so this calculator applies a simplified flat 20% and doesn't model those phase-out thresholds; if your business income is high, get the exact number from a tax professional.

The Additional Medicare Tax (0.9% on top of the standard 2.9%) kicks in once your combined wages and self-employment earnings cross a threshold based on your filing status, not your self-employment income alone. If you also have a W-2 job alongside your 1099 work, that income counts toward the threshold, so leaving it out could understate your total tax.

If you expect to owe more than a small threshold amount for the year, generally yes: the US tax system is pay-as-you-go, and without an employer withholding for you, the IRS expects roughly even payments through the year rather than one lump sum in April. Missing or underpaying a quarterly deadline can trigger a small penalty, even if you pay everything owed by the annual filing deadline.

The biggest lever most self-employed people have is deductible business expenses, which is why the calculator subtracts them before anything else; every legitimate expense reduces both your income tax and your self-employment tax. Retirement account contributions (like a SEP-IRA or Solo 401(k)) and health insurance premium deductions can also meaningfully lower the bill, but the details depend on your specific situation, which is exactly the kind of thing worth a conversation with a tax professional.