United States Self-Employed Tax Calculator 2025

Calculate your estimated United States income tax and SE Tax (Self-Employment Tax) liability as a self-employed individual or sole trader. Enter your income and allowable expenses to see your 2025 tax breakdown based on IRS (Internal Revenue Service) Form 1040 / Schedule C rates.

About US Self-Employment Taxes

Understanding Your Federal Taxes

Self-Employment (SE) Tax: SE Tax is 15.3% applied to 92.35% of your net profit — 12.4% Social Security (capped at the SS Wage Base: $176,100 for 2025, $184,500 for 2026) plus 2.9% Medicare. You pay both employer and employee portions. Half of SE Tax is deductible from your AGI.
Federal Income Tax: Progressive rates from 10% to 37% applied to your adjusted gross income (net profit minus half SE Tax minus standard deduction minus QBI deduction). Standard deduction for 2025: $15,750 (Single) / $31,500 (Married Filing Jointly).
QBI Deduction (20%): Most self-employed individuals can deduct 20% of their Qualified Business Income, reducing federal income tax significantly. This phases out for Specified Service Trades or Businesses (SSTBs — law, consulting, health, finance) above $197,300 (2025 Single).

Quarterly Taxes & Safe Harbor

Pay quarterly to avoid penalties: If you expect to owe $1,000+ in tax, you must pay estimated taxes quarterly via Form 1040-ES. Due: April 15, June 15, September 15, January 15.
Safe Harbor rule: Pay at least 90% of current year’s tax liability, or 100% of last year’s tax (110% if prior AGI > $150,000), to avoid underpayment penalties.
Monthly set-aside tip: Set aside 25–35% of each client payment throughout the year. This covers SE Tax (~15%) plus federal income tax (10–22% for most self-employed). Use our Savings Calculator for a precise monthly target.

This calculator provides federal tax estimates for Single filers based on IRS 2025 rates. State income tax is shown separately when a state is selected. This is not tax advice — consult a qualified CPA or tax professional for guidance specific to your situation.

Worked Example: Example: US Freelancer Earning $80,000

Gross income: $80,000 in client fees
Business expenses: $12,000 (home office, equipment, software, mileage)
Net profit (Schedule C): $68,000
SE Tax Base: $68,000 × 92.35% = $62,798
SE Tax: $62,798 × 15.3% = $9,608 (SS: $7,787 + Medicare: $1,821)
Half SE Tax deduction: $9,608 × 50% = $4,804 (deducted from AGI)
AGI: $68,000 − $4,804 = $63,196
Standard deduction (2025 Single): $15,750
QBI deduction (20%): $68,000 × 20% = $13,600 (capped at 20% of taxable income)
Taxable income: $63,196 − $15,750 − $13,600 = $33,846
Federal income tax: 10% on $11,925 ($1,193) + 12% on $21,921 ($2,630) = $3,823
Total federal tax: $9,608 (SE) + $3,823 (income) = $13,431
Quarterly estimated (Form 1040-ES): $13,431 ÷ 4 = $3,358/quarter
Safe Harbor minimum: $3,022/quarter (90% of quarterly estimate)

A US freelancer with $80,000 gross income and $12,000 in expenses pays approximately $13,431 in combined federal SE Tax and income tax — an effective rate of about 16.8% of net profit. Quarterly estimated tax payments of ~$3,358 are due four times a year. The monthly set-aside recommendation is about $1,120/month.

How US Self-Employment Tax Works (Schedule C / Form 1040)

Self-employed individuals in the United States file Schedule C (Profit or Loss from Business) as part of Form 1040. Your net profit (income minus allowable expenses) is subject to two taxes:

Self-Employment (SE) Tax: 15.3% (12.4% Social Security + 2.9% Medicare) on 92.35% of net profit. The Social Security portion is capped at $176,100 (2025). You deduct half of SE Tax above-the-line on Schedule 1.
Federal Income Tax: Calculated on Adjusted Gross Income (AGI) minus the Standard Deduction ($15,750 single / $31,500 MFJ in 2025) using graduated brackets from 10% to 37%.

Filing Deadlines

The annual filing deadline for Form 1040 (with Schedule C) is April 15. A six-month automatic extension to October 15 is available by filing Form 4868, but this extends the filing date only — any tax owed must still be paid by April 15 to avoid penalties and interest.

Quarterly Estimated Tax Payments (Form 1040-ES)

Because no employer withholds tax, self-employed individuals must pay estimated taxes quarterly to avoid underpayment penalties:

Q1 (Jan 1 – Mar 31): April 15
Q2 (Apr 1 – May 31): June 15
Q3 (Jun 1 – Aug 31): September 15
Q4 (Sep 1 – Dec 31): January 15 (following year)

Safe Harbor rule: Pay 100% of prior year tax (or 110% if prior AGI exceeded $150,000) in 4 equal instalments to avoid IRS underpayment penalties.

QBI Deduction (Section 199A)

Most self-employed individuals can deduct up to 20% of qualified business income (QBI). This deduction reduces federal income tax but not SE Tax. The deduction phases out for Specified Service Trade or Business (SSTB) owners — including law, consulting, health, and financial services — with taxable income above $197,300 (single) or $394,600 (MFJ) in 2025. Made permanent by OBBBA 2025.