Independent contractor taxes come in two layers: federal income tax on your net business profit, and a 15.3% self-employment tax that covers Social Security and Medicare. Nothing is withheld for you, so you send the IRS estimated payments four times a year using Form 1040-ES, then reconcile everything on an annual return that includes Schedule C for your business income and Schedule SE for the self-employment tax. If your net earnings from self-employment reach at least $400 for the year, self-employment tax applies.1Office of the Law Revision Counsel. 26 USC 1402 – Definitions
How Self-Employment Tax Works
Employees split Social Security and Medicare with their employer. Contractors pay both halves. The combined rate is 15.3% of net self-employment income: 12.4% for Social Security and 2.9% for Medicare.2Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax
The rate does not apply to 100% of your net profit. You first multiply net profit by 92.35%, then apply 15.3% to that reduced figure. The adjustment mirrors the tax break employees get because their employer’s share of FICA is not treated as taxable wages.3Internal Revenue Service. Schedule SE (Form 1040) – Self-Employment Tax
The 12.4% Social Security portion applies only up to a wage base cap, which is $184,500 for 2026.4Social Security Administration. Contribution and Benefit Base Earnings above that ceiling remain subject to the 2.9% Medicare portion. Higher earners also owe an additional 0.9% Medicare surtax on self-employment income above $200,000 for single filers or $250,000 for married couples filing jointly.5Internal Revenue Service. Topic No. 560, Additional Medicare Tax
One built-in relief: you can deduct half of your self-employment tax when calculating adjusted gross income. The deduction goes on Schedule 1 of Form 1040. It reduces the income subject to income tax, but not the self-employment tax itself.6Office of the Law Revision Counsel. 26 USC 164 – Taxes
Federal Income Tax on Your Net Profit
On top of self-employment tax, your business profit is taxed at the same graduated rates that apply to wages. For 2026, single filers pay 10% on the first $12,400 of taxable income, then climb through brackets of 12%, 22%, 24%, 32%, and 35%, with the top rate of 37% starting above $640,600.7Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
Net profit is gross receipts minus allowable business expenses. If you billed clients $95,000 and spent $20,000 on legitimate business costs, income tax applies to $75,000 before the standard deduction and other adjustments come into play. The deductible half of self-employment tax then reduces taxable income further, so the effective bite is smaller than a first look at the numbers suggests.
Quarterly Estimated Payments
Because no employer is withholding for you, the IRS expects estimated payments four times a year, sent with Form 1040-ES.8Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals For the 2026 tax year, the deadlines fall on:
- April 15, 2026, for income earned January through March
- June 15, 2026, for April and May
- September 15, 2026, for June through August
- January 15, 2027, for September through December
You avoid the underpayment penalty if your total tax owed after withholding and credits is under $1,000 when you file.9Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual To Pay Estimated Income Tax You also avoid it by paying at least 90% of your current-year tax, or 100% of your prior-year tax (110% if your prior-year adjusted gross income was above $150,000).10Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty The prior-year safe harbor is useful in unpredictable years because it locks your required payments to a known number regardless of what you actually earn.
A separate late-payment penalty applies if you owe tax at the filing deadline and do not pay: 0.5% of the unpaid balance for each month it remains outstanding, capped at 25%.11Office of the Law Revision Counsel. 26 USC 6651 – Failure To File Tax Return or To Pay Tax
The Forms You Will File
Form 1099-NEC
Any client who pays you $600 or more during the year is supposed to send you a Form 1099-NEC and file the same information with the IRS.12Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC If a client paid you less than $600, or simply failed to send the form, you still owe tax on every dollar of that income. Bank deposits and your own invoices are the backup when a form never arrives.
Schedule C
Schedule C is where your business income and expenses come together. Gross receipts go at the top, expenses get itemized by category, and the bottom line is your net profit or loss. That figure flows to Form 1040 for income tax and to Schedule SE for self-employment tax.13Internal Revenue Service. About Schedule C (Form 1040), Profit or Loss From Business (Sole Proprietorship)
Schedule SE
Schedule SE handles the self-employment tax calculation. It pulls net profit from Schedule C, applies the 92.35% factor, then the 15.3% rate. The resulting tax lands on Schedule 2 of Form 1040, and half of it becomes the deduction on Schedule 1.3Internal Revenue Service. Schedule SE (Form 1040) – Self-Employment Tax
Form 1040-ES
Form 1040-ES includes a worksheet that projects your total tax liability for the year and produces four payment vouchers. If you pay electronically you will not mail the vouchers, but the worksheet is still worth completing so your quarterly payments are grounded in a real estimate rather than a guess.8Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals
Deductions That Shrink the Bill
Every legitimate business expense reduces your taxable profit dollar for dollar, which in turn reduces both income tax and self-employment tax. Common categories include equipment, supplies, software subscriptions, professional development, advertising, business insurance, and fees paid to subcontractors or accountants. The standard is that each expense must be ordinary and necessary for your line of work.
Self-Employed Health Insurance
If you pay for your own health coverage and are not eligible for a spouse’s employer plan, you can deduct 100% of premiums for yourself, your spouse, and your dependents. The policy must be established under your business, though for a sole proprietor a policy in your own name qualifies. The deduction is capped at your net self-employment income and is unavailable for any month you could have joined an employer-subsidized plan.14Internal Revenue Service. Instructions for Form 7206 It is claimed on Schedule 1, so it reduces adjusted gross income rather than Schedule C profit.
Qualified Business Income Deduction
Under Section 199A, eligible self-employed individuals can deduct up to 20% of qualified business income from taxable income. Recent legislation extended the deduction into 2026 with modified phase-out thresholds. It is straightforward for contractors whose taxable income sits below the phase-out range and more limited for higher earners in specified service fields such as consulting, law, and accounting. The deduction is claimed on Form 1040, not on Schedule C.
Home Office
If part of your home is used exclusively and regularly as your principal place of business, you can deduct a share of housing costs. The simplified method allows $5 per square foot up to 300 square feet, for a maximum of $1,500.15Internal Revenue Service. Simplified Option for Home Office Deduction The regular method allocates actual costs like rent or mortgage interest, utilities, and insurance based on the percentage of your home used for business. It takes more paperwork but often produces a larger deduction.
Vehicle Mileage
Business driving can be deducted using either actual expenses or the IRS standard rate. For 2026, the business mileage rate is 72.5 cents per mile.16Internal Revenue Service. 2026 Standard Mileage Rates (Notice 2026-10) To claim the deduction, log each business trip at or near the time it happens: date, destination, purpose, and miles. A reconstruction built during tax season is unlikely to hold up in an audit.
Retirement Accounts as a Tax Tool
Self-employed people have retirement account options that often let them shelter more income than a workplace 401(k) allows. Pre-tax contributions reduce current-year taxable income, which compounds the tax savings.
A SEP IRA lets you contribute up to 25% of net self-employment income (after deducting half of self-employment tax), with a 2026 cap of $72,000.17Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs) It can be opened at most brokerages in minutes and funded as late as your filing deadline including extensions. All contributions come from the employer side, with no employee deferral component.
A solo 401(k) is available if you have no employees other than a spouse. It allows an employee deferral of up to $24,500 for 2026 plus an employer profit-sharing contribution, with a combined cap of $72,000. A $8,000 catch-up applies at age 50 or older, and contractors aged 60 through 63 get an enhanced catch-up of $11,250.18Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 The employee deferral is what makes this attractive when your net income is too low to hit a SEP IRA’s percentage-based cap.
A traditional or Roth IRA can sit alongside either plan. The 2026 limit is $7,500, or $8,600 at age 50 or older.18Internal Revenue Service. 401(k) Limit Increases to $24,500 for 2026, IRA Limit Increases to $7,500 The amounts are smaller, but a Roth offers tax-free growth and withdrawals in retirement.
State and Local Taxes Are Separate
Federal is not the whole picture. Most states impose their own income tax on self-employment earnings, and quarterly estimated payment obligations usually extend to the state level. Rates and rules vary widely. Some cities add their own income tax or an unincorporated business tax on freelancers operating within city limits. Check your state’s department of revenue and your city or county’s finance office. Some jurisdictions also require a business license or permit for home-based freelancers, with fees that vary by location.
Paying the IRS
IRS Direct Pay moves money straight from a bank account with no fee.19Internal Revenue Service. Direct Pay With Bank Account The Electronic Federal Tax Payment System lets you schedule payments up to 365 days ahead and track history, but enrollment can take up to five business days.20Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System Check or money order works if you are mailing a paper return; include the voucher your tax software generates. Whichever channel you use, save the confirmation. Proof of a timely payment is worth as much as the payment itself.