Self Employed Tax in United States

What is self-employment tax and how does it apply?

Self-employment (SE) tax is the Social Security and Medicare tax for self-employed individuals, imposed under IRC §1401 [SC1]. It is the equivalent of the FICA tax that employees and employers each pay on wages, except that the self-employed individual pays both halves. For 2025, the SE tax rate is 15.3 percent, broken down as:

• Social Security: 12.4 percent on the first USD 168,600 of net SE earnings (the Social Security wage base for 2025, adjusted annually). Earnings above the wage base do not face the Social Security portion.
• Medicare: 2.9 percent on all net SE earnings, no cap.
• Additional Medicare Tax under IRC §3101(b)(2): 0.9 percent on earnings above USD 200,000 (single, head of household) or USD 250,000 (MFJ) or USD 125,000 (MFS), with no employer-paid equivalent. Computed on Form 8959.

The SE tax is computed on net earnings from self-employment, which is generally 92.35 percent of net SE income (the 7.65 percent reduction reflects the deduction allowed for the employer-equivalent half of SE tax). A filer with USD 100,000 of net Schedule C income has USD 92,350 of net SE earnings, on which 15.3 percent SE tax applies — USD 14,130 of SE tax before the Additional Medicare overlay.

One-half of SE tax is deductible above-the-line on Schedule 1, Form 1040, as an adjustment to income under IRC §164(f). This reduces both regular income tax and the AGI used for various phase-outs but does not reduce SE tax itself. The deduction is the federal-level recognition that the self-employed individual is bearing both the employee and employer portions of FICA.

Who is subject to SE tax versus just income tax?

A filer is subject to SE tax if they have net earnings from self-employment of USD 400 or more during the tax year [SC1]. Net earnings from self-employment include:

• Net profit from a sole proprietorship reported on Schedule C
• Net profit from a single-member LLC treated as a disregarded entity (reported on Schedule C)
• Distributive share of net earnings from a partnership where the partner is a general partner or LLC member-manager (reported on Schedule SE)
• Self-employment income from any trade or business carried on as an individual

Not subject to SE tax (income tax only):

• S-corporation distributions: Pass-through income from an S corporation that exceeds the shareholder's reasonable compensation is dividend-like and not subject to SE tax (a major reason filers elect S-corp status when net income exceeds the SS wage base).
• Passive partnership interests: Limited partner income (with certain exceptions) is generally not SE-taxable.
• Rental real estate income: Generally passive and not subject to SE tax, unless the activity rises to the level of a real-estate trade or business (e.g., short-term vacation rentals with substantial services).
• Interest, dividends, capital gains: Investment income is not SE-taxable.
• W-2 wages from your own corporation: Subject to regular FICA (split between employer and employee) but not SE tax.
• Income from a hobby: Not subject to SE tax (also not deductible against ordinary income after TCJA repealed miscellaneous itemized deductions). The trade-or-business test under IRC §183 distinguishes hobby from trade — factors include regularity, profit motive, recordkeeping, expertise.

The S-corporation reasonable compensation rule is a frequent IRS audit focus. An S-corporation owner-operator paying themselves USD 30,000 in W-2 wages while taking USD 200,000 in distributions is at audit risk; the IRS will recharacterize a portion of distributions as wages subject to FICA. Reasonable compensation is determined by what an unrelated employer would pay for the same services in the same geographic market.

Quarterly estimated payments under Form 1040-ES

Self-employed individuals whose withholding will not cover their year-end tax liability owe quarterly estimated payments under IRC §6654 [SC2]. The four 2025 quarterly deadlines are:

• April 15, 2025 (for Q1: income earned January 1 to March 31)
• June 15, 2025 (for Q2: April 1 to May 31)
• September 15, 2025 (for Q3: June 1 to August 31)
• January 15, 2026 (for Q4: September 1 to December 31)

The safe-harbor rule avoids underpayment penalty under IRC §6654(d): a filer's quarterly payments are sufficient if they total at least the lesser of:

1. 90 percent of the current year's tax liability, OR
2. 100 percent of the prior year's tax liability (110 percent if prior-year AGI exceeded USD 150,000, or USD 75,000 MFS)

A filer with USD 100,000 of prior-year tax liability who pays at least USD 25,000 per quarter avoids underpayment penalty regardless of current-year liability. A high-income filer (USD 150,000+ AGI) must pay 110 percent of prior-year tax to satisfy the safe harbor.

The underpayment penalty is computed on Form 2210, with a rate that adjusts quarterly based on the federal short-term rate plus 3 percent (approximately 8 percent for most of 2024-2025). The penalty applies on a quarterly basis to whichever quarter has insufficient payment, so a Q3 shortfall can produce penalty even if Q4 catches up.

Estimated payments are submitted via Form 1040-ES, which includes a worksheet to project current-year income and tax liability. EFTPS (Electronic Federal Tax Payment System), IRS Direct Pay, or check by mail are the payment channels. Filers with state income tax also submit state quarterly estimates on similar schedules.

Schedule C: reporting business income and expenses

Schedule C (Profit or Loss From Business — Sole Proprietorship) is the principal reporting form for self-employed individuals [SC1]. It reports gross receipts and itemizes deductible expenses across categories including:

• Advertising and marketing
• Car and truck expenses: Either actual expense method (gas, oil, repairs, depreciation, insurance, registration) or standard mileage rate (USD 0.67 per business mile for 2025, adjusted annually). The two methods cannot be combined for the same vehicle.
• Commissions and fees
• Contract labor: Payments to independent contractors. Payments to a single non-corporate contractor of USD 600 or more during the year require issuance of Form 1099-NEC to the contractor and the IRS. Platforms like Tax1099 handle the e-file workflow.
• Depreciation: Capitalized equipment and improvements depreciated under IRC §168. Section 179 expensing (up to USD 1.25 million for 2025) allows immediate expensing of qualifying equipment.
• Insurance: Business insurance premiums.
• Interest: Business-loan interest.
• Legal and professional services
• Office expenses
• Rent or lease: Business rent.
• Repairs and maintenance
• Supplies
• Taxes and licenses: Other than SE tax (which has a separate above-the-line line) and federal income tax (non-deductible).
• Travel and meals: Travel 100 percent deductible; meals 50 percent (subject to ordinary-and-necessary and substantiation rules).
• Utilities
• Wages: W-2 wages paid to employees.
• Other expenses: Itemized line for category-specific items.

The home office deduction under IRC §280A is a separate Schedule C line (or Form 8829 if itemized). Two methods:

• Simplified method: USD 5 per square foot of qualified home office, up to 300 square feet (max USD 1,500 deduction).
• Regular method: Actual percentage of home expenses (utilities, mortgage interest or rent, insurance, depreciation) allocated by the percentage of home square footage used for the business.

The home office must be used regularly and exclusively for business — no commingling with personal use. The space must be the principal place of business or a place used to meet clients. Employees claiming a home office for unreimbursed employer work cannot deduct it (TCJA eliminated unreimbursed employee business expenses); only self-employed filers can.

Section 199A Qualified Business Income deduction

The Qualified Business Income (QBI) deduction under IRC §199A allows pass-through business owners to deduct up to 20 percent of qualified business income from taxable income [SC3]. The deduction was created by TCJA in 2017 and made permanent by the One Big Beautiful Bill Act in 2025.

Key mechanics:

• Deduction equals 20 percent of QBI plus 20 percent of qualified REIT dividends and qualified publicly traded partnership income.
• Limited to 20 percent of (taxable income minus net capital gain): The overall cap prevents QBI from reducing taxable income below the level supported by ordinary income.
• Phase-in / phase-out for higher-income filers: For 2025, the thresholds are USD 241,950 (single) and USD 483,900 (MFJ). Within the phase-in range (USD 241,950 - USD 291,950 single; USD 483,900 - USD 583,900 MFJ), additional limitations apply progressively. Above the upper threshold, two limitations apply fully:
  • W-2 wages and UBIA limit: Deduction is limited to the greater of (50 percent of W-2 wages paid by the business) or (25 percent of W-2 wages plus 2.5 percent of unadjusted basis immediately after acquisition (UBIA) of qualified property).
  • Specified Service Trade or Business (SSTB) exclusion: Filers above the upper threshold in SSTB activities (health, law, accounting, consulting, financial services, investment management, performing arts, athletics, and trades whose principal asset is the reputation or skill of one or more employees) are excluded from QBI.

Form 8995 (simplified) or Form 8995-A (full) is the computation form. The deduction is below-the-line (does not reduce AGI but reduces taxable income).

A single filer with USD 200,000 of Schedule C income, no SSTB issue, and total taxable income of USD 180,000 (after SE tax deduction and standard deduction) qualifies for the full 20 percent simplified QBI: USD 36,000 deduction (assuming no other limitations apply at that income level).

Retirement contribution structures for self-employed filers

Self-employed filers have multiple retirement structures available, each with different contribution limits and administrative burden [SC4]:

• SEP IRA (Simplified Employee Pension): Contribution up to the lesser of 25 percent of compensation (20 percent for sole proprietors, after the SE tax deduction adjustment) or USD 70,000 for 2025. Easy to establish — IRS Form 5305-SEP serves as the plan document. Contributions are pre-tax, deductible above-the-line on Schedule 1. Distributions taxable as ordinary income at retirement.
• Solo 401(k): Available to self-employed individuals with no employees other than a spouse. Two contribution layers:
  • Employee elective deferral: up to USD 23,500 (2025) plus USD 7,500 catch-up (age 50+).
  • Employer profit-sharing: up to 25 percent of compensation (20 percent for sole proprietors).
  • Combined cap: USD 70,000 (2025) plus catch-up, the same as the SEP IRA cap but reachable at lower income levels because the employee elective deferral is not income-tested.
• SIMPLE IRA: For small businesses with 100 or fewer employees. Employee elective deferral up to USD 16,500 (2025) plus USD 3,500 catch-up (USD 5,250 enhanced catch-up for ages 60-63 under SECURE 2.0). Employer match required (3 percent of compensation or 2 percent non-elective for all employees).
• Defined Benefit Plan: For higher-earning self-employed individuals (typically attorneys, doctors, consultants in solo practice) seeking larger annual contributions. Contribution computed actuarially based on age, income, and target retirement benefit; can exceed USD 200,000 per year for late-career filers. Higher administrative cost and required annual actuarial valuation.
• Roth Solo 401(k) and Roth IRA: Post-tax contributions, tax-free growth and qualifying withdrawals. Roth Solo 401(k) elective deferral limit is the same as traditional (USD 23,500 + catch-up), but no income limit (unlike Roth IRA which phases out above USD 161,000 single / USD 240,000 MFJ for 2025).

Contribution deadline for SEP IRA and Solo 401(k) is the federal return due date including extensions (October 15 for filers extending), allowing contribution decisions to be made with full visibility into year-end profit. SIMPLE IRA contributions must be made by January 15 for employee deferrals and by the return due date for employer match.

Health insurance and HSA contributions

Self-employed health insurance premiums (medical, dental, long-term care) for the filer, spouse, and dependents are deductible above-the-line on Schedule 1, up to the filer's net SE earnings from the activity that provides the coverage [SC5]. The deduction is NOT subject to the 7.5 percent AGI floor that applies to medical expenses deducted on Schedule A. This is one of the more material deductions for self-employed filers who cover their own health insurance.

The deduction is taken at the filer level, not the business level — it does not reduce Schedule C income or SE tax. A filer with USD 80,000 Schedule C income paying USD 12,000 of family health insurance premiums deducts USD 12,000 on Schedule 1 (reducing AGI), but the USD 80,000 of Schedule C income still bears the full SE tax.

High-Deductible Health Plan (HDHP) participants are eligible to contribute to a Health Savings Account (HSA) under IRC §223. 2025 HSA contribution limits are USD 4,300 single coverage / USD 8,550 family coverage plus USD 1,000 catch-up for filers age 55+. Contributions are above-the-line deductible on Schedule 1, growth is tax-free, and withdrawals for qualified medical expenses are tax-free — the triple tax advantage. Self-employed HDHP enrollees pay HSA contributions personally and claim the Schedule 1 deduction; the SE tax does not apply to the contribution.

State-level self-employment tax considerations

State income tax applies to self-employed earnings in 41 of the 50 states plus DC. Nine states have no state income tax: Alaska, Florida, Nevada, New Hampshire (after 2025 phase-out), South Dakota, Tennessee, Texas, Washington, Wyoming. The tax rates and bracket structures vary; California's top state rate is 13.3 percent, while Arizona's flat rate is 2.5 percent (2025).

Quarterly state estimated payments are typically required on the same April / June / September / January schedule. Some states (Wisconsin, Minnesota) offer credits or deductions for self-employed insurance that mirror or modify the federal treatment. The state-level pass-through entity (PTE) election regimes adopted by 36 states in response to the SALT cap allow S-corp and partnership owners to pay state income tax at the entity level — converting an SALT-capped Schedule A deduction into an uncapped business expense deduction.

Local-level taxes can also apply: New York City's Unincorporated Business Tax (UBT) of 4 percent on sole proprietorship and partnership income above thresholds, San Francisco's gross receipts tax, and various local business privilege taxes. Multi-state self-employed filers face apportionment questions for income earned partly inside and partly outside their state of residence.

For cross-border self-employed filers (US persons living abroad as freelancers or independent contractors), the Foreign Earned Income Exclusion (FEIE) under IRC §911 excludes up to USD 130,000 of foreign-earned income from US income tax for 2025 but does NOT exclude income from SE tax — the SE tax obligation runs on worldwide self-employment earnings. The mechanics are covered in the Expat tax residency crossover.

Common 1099 issuance and recordkeeping obligations

Self-employed filers who pay non-employees USD 600 or more during the year must issue Form 1099-NEC (Nonemployee Compensation) to the recipient and the IRS by January 31 of the following year [SC6]. Form 1099-MISC covers miscellaneous payments (rent, royalties, prizes) at the same USD 600 threshold but with a different filing deadline (February 28 paper / March 31 electronic).

Form 1099-K thresholds for third-party payment networks (PayPal, Venmo, Stripe) under IRC §6050W were lowered by the American Rescue Plan from USD 20,000 / 200 transactions to USD 600, then phased in. For 2025, the threshold is USD 5,000 of aggregate payments (any number of transactions); 2026 drops to USD 2,500; 2027 drops to USD 600 absent further legislative action.

Recordkeeping requirements under IRC §6001 and Treasury regulations require self-employed filers to maintain books and records sufficient to determine federal tax liability, including:

• Receipts for all expenses above USD 75 (lower threshold for travel and entertainment)
• Mileage logs for vehicle deductions
• Bank and credit card statements
• Invoices issued and received
• Annual gross receipts and expense summaries

The records must be retained for at least three years after filing (six years if income was substantially understated; indefinitely if no return was filed or if the return was fraudulent). Practitioners issuing 1099-NEC and 1099-MISC at scale typically use platforms like Tax1099 which handles e-filing with the IRS and TIN matching to reduce mismatched 1099 penalties. Filers managing multi-currency invoicing for international clients often pair Schedule C income tracking with WorldFirst accounts that handle USD-foreign-currency exchange and receivables.

For a complete picture of how self-employment income connects to the rest of the federal stack, see the US federal tax overview for the full bracket structure, Small business tax for entity-choice analysis when SE tax grows large, Capital gains tax for treatment of business asset dispositions, and Crypto taxation for self-employed crypto traders and miners. The Self-employment topic hub compares US treatment with other jurisdictions. To find a credentialed practitioner who handles self-employed returns, browse the US tax-pros directory.