Self-Employed Tax in United States

Self-employed individuals in the United States face a distinct tax structure from employees: they bear both halves of Social Security and Medicare tax, file Schedule C to report business income and expenses, make quarterly estimated payments throughout the year, and can access deductions that reduce both ordinary income tax and, in some cases, self-employment tax itself. This page summarizes the key federal obligations and deductions for sole proprietors, independent contractors, single-member LLC owners, and gig workers in 2025, citing primary sources from the IRS.

How does self-employment (SE) tax work, and what is the 15.3% rate?

Self-employment tax (SE tax) is the Social Security and Medicare tax for individuals who work for themselves, imposed under IRC Section 1401. Employees have this tax split between themselves and their employer, each paying 7.65%. Self-employed individuals pay both halves, yielding a combined rate of 15.3% on net self-employment earnings [SC1].

The 15.3% breaks down as follows:

• Social Security (OASDI): 12.4% applies to the first $176,100 of net SE earnings in 2025. This threshold, called the Social Security wage base, adjusts each year for inflation. Net earnings above $176,100 are not subject to the 12.4% Social Security portion.
• Medicare (HI): 2.9% applies to all net SE earnings with no upper cap.
• Additional Medicare Tax: An extra 0.9% applies to net SE earnings (combined with wages and other compensation) exceeding $200,000 for single filers or $250,000 for married filing jointly, under IRC Section 3101(b)(2). There is no employer-equivalent portion of this surtax; the self-employed individual bears it entirely. It is computed on Form 8959 [SC1].

SE tax is calculated on 92.35% of net self-employment income. The 7.65% reduction mirrors the employer-side deduction that wage earners implicitly receive. A filer with $100,000 of net Schedule C profit has $92,350 of net SE earnings, on which the 15.3% SE tax applies -- approximately $14,130 before the Additional Medicare overlay.

The deduction for half of SE tax is one of the most important adjustments available. Under IRC Section 164(f), the employer-equivalent portion of SE tax -- half of the total SE tax paid -- is deductible above-the-line as an adjustment to gross income on Schedule 1 of Form 1040. This reduces ordinary income tax (and the AGI used in various phase-out calculations) without reducing SE tax itself. The deduction is calculated on Schedule SE and flows automatically to Schedule 1 [SC1].

*Additional Medicare Tax (0.9%) applies to earnings above $200,000 single / $250,000 MFJ.

What forms do self-employed filers use to report income and calculate SE tax?

Self-employed sole proprietors file two core schedules with their Form 1040 [SC1]:

• Schedule C (Profit or Loss From Business): Reports gross receipts and deductible business expenses for the sole proprietorship or single-member LLC. Net profit (or loss) from Schedule C flows to Schedule 1 and becomes part of gross income for income tax purposes. It also feeds Schedule SE as the basis for SE tax.
• Schedule SE (Self-Employment Tax): Calculates the actual SE tax owed. Net earnings from self-employment (92.35% of net Schedule C profit) are entered here; the 15.3% rate is applied up to the wage base, 2.9% above it. The resulting SE tax is split in half -- the employer-equivalent half becomes the above-the-line deduction on Schedule 1, and the full SE tax is added to income tax liability on Form 1040.

Schedule SE is required whenever net earnings from self-employment are $400 or more. The deductible half of SE tax that flows from Schedule SE to Schedule 1 is automatic -- no separate election is needed [SC1].

Deductible business expenses on Schedule C span: advertising; car and truck expenses (actual cost or the 2025 standard mileage rate of $0.67 per mile); commissions and fees; contract labor; depreciation and Section 179 expensing; insurance; interest on business loans; legal and professional services; office expenses; rent or lease; repairs and maintenance; supplies; travel (100% deductible) and meals (50% deductible); utilities; wages paid to employees; and a dedicated line for home office expenses. The home office deduction under IRC Section 280A covers space used regularly and exclusively for business, calculated either via the simplified method ($5 per square foot, maximum 300 square feet, maximum deduction $1,500) or the regular method (actual percentage of home expenses via Form 8829) [SC5].

How do quarterly estimated taxes work, and when are payments due?

Because self-employed individuals have no employer withholding, they generally owe quarterly estimated payments under IRC Section 6654. The 2025 due dates for Form 1040-ES are [SC2]:

• April 15, 2025 -- covering income earned January 1 through March 31
• June 15, 2025 -- covering income earned April 1 through May 31
• September 15, 2025 -- covering income earned June 1 through August 31
• January 15, 2026 -- covering income earned September 1 through December 31

If a due date falls on a weekend or federal holiday, the deadline shifts to the next business day. The IRS provides worksheets in Form 1040-ES to estimate annual income, deductions, and tax liability for each quarter.

The safe-harbor rule avoids the underpayment penalty if total annual estimated payments plus withholding equal at least the lesser of (a) 90% of the current year's tax liability or (b) 100% of the prior year's tax liability -- rising to 110% of prior-year tax if prior-year AGI exceeded $150,000 (or $75,000 for married filing separately). Payment channels include the IRS Electronic Federal Tax Payment System (EFTPS), IRS Direct Pay, or check submitted with a Form 1040-ES voucher [SC2].

What is the Qualified Business Income (QBI) deduction, and does it apply in 2025?

The Section 199A Qualified Business Income (QBI) deduction allows eligible pass-through business owners to deduct up to 20% of qualified business income from taxable income -- a significant reduction in effective income tax rate for self-employed filers [SC3].

Key mechanics for tax year 2025:

• Deduction amount: Up to 20% of QBI from a qualifying domestic business (sole proprietorship, single-member LLC, partnership, or S corporation), subject to an overall cap of 20% of taxable income minus net capital gains.
• Below-the-line deduction: The QBI deduction reduces taxable income but does not reduce AGI or SE tax.
• Income thresholds: For 2025, filers below $197,300 (single) or $394,600 (married filing jointly) in taxable income generally qualify for the full 20% deduction without W-2 wage or property limitations. Filers above $247,300 (single) or $494,600 (MFJ) face full limitations, including the W-2 wages/UBIA test and the Specified Service Trade or Business (SSTB) exclusion. A phase-in range applies between those thresholds [SC4].
• SSTB exclusion: Filers above the upper threshold in certain service businesses -- including health, law, accounting, consulting, financial services, athletics, and performing arts -- cannot claim the QBI deduction. Architecture and engineering are NOT excluded [SC3].
• Permanence: The QBI deduction was originally enacted by the Tax Cuts and Jobs Act of 2017 and was set to expire after 2025. The One Big Beautiful Bill Act, signed in 2025, made the deduction permanent. The Act's additional changes -- including a new $400 minimum deduction floor for filers with at least $1,000 of QBI from a materially participated business, and expanded phase-in ranges -- take effect for tax years beginning after December 31, 2025, meaning they first appear on 2026 returns [SC4].

Computation uses Form 8995 (simpler cases) or Form 8995-A (higher-income filers with SSTB activity, multiple businesses, or W-2 wage limitations).

What are the 1099-NEC and 1099-K reporting obligations for self-employed filers?

Self-employed individuals interact with 1099 information returns in two ways: they receive them from clients and platforms, and they issue them to contractors they pay [SC1].

Receiving 1099-NEC: Clients who pay a self-employed individual $600 or more during the year for nonemployee compensation are required to issue Form 1099-NEC by January 31. The form reports the amount to both the recipient and the IRS. Regardless of whether a 1099-NEC is received, all income earned is reportable on Schedule C [SC6].

Form 1099-K from payment platforms: Third-party settlement organizations (payment apps, online marketplaces) are required to issue Form 1099-K when reportable payments exceed $20,000 and 200 transactions. The One Big Beautiful Bill Act, enacted in 2025, retroactively reinstated this $20,000 / 200-transaction standard, reversing the lower thresholds that had been planned under the American Rescue Plan Act. This means many self-employed filers who transact via PayPal, Venmo, Stripe, or similar platforms below the $20,000/200-transaction threshold will not receive a 1099-K -- but remain obligated to report all income on Schedule C regardless of whether a form is issued [SC7].

Issuing 1099-NEC: Self-employed filers who pay independent contractors $600 or more for services during the year must issue Form 1099-NEC by January 31 and file Copy A with the IRS. Payments to corporations are generally exempt, as are payments via credit card or third-party payment networks (those are covered by 1099-K rules on the payer side).

For a full picture of federal tax brackets, the standard deduction, and how SE income interacts with the broader return, see the United States country overview. Decisions about operating as an S corporation (to reduce SE tax on distributions above a reasonable salary) are covered in the small-business entity-choice analysis. A qualified tax professional can evaluate whether the SE tax savings from an S-corp election outweigh the additional administrative costs given a specific income level.