Independent contractor tax payments have two components: self-employment tax of 15.3 percent on most net earnings, and federal income tax at rates from 10 to 37 percent. The IRS expects both to be paid in four installments across the year rather than in one payment at filing time. If your net earnings from self-employment reach $400 or more in a calendar year, you owe self-employment tax on them, whether contracting is your main work or a side gig.1Internal Revenue Service. Topic No. 554, Self-Employment Tax
What You Actually Owe
Self-employment tax funds Social Security and Medicare. In a regular job your employer pays half; as a contractor you pay both halves. The Social Security portion is 12.4 percent and the Medicare portion is 2.9 percent, for a combined 15.3 percent.2Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax That rate applies to 92.35 percent of your net earnings rather than the full amount, which mirrors the break employees get by not being taxed on their employer’s share.1Internal Revenue Service. Topic No. 554, Self-Employment Tax On $100,000 of net self-employment income, self-employment tax is calculated on $92,350.
Two caps and a surcharge shape the number:
- The 12.4 percent Social Security tax applies only to the first $184,500 in earnings for 2026. Income above that escapes the Social Security portion.3Social Security Administration. Contribution and Benefit Base
- The 2.9 percent Medicare tax has no upper limit.
- Self-employment earnings above $200,000 for single filers trigger an additional 0.9 percent Medicare surtax on the excess.4Internal Revenue Service. Topic No. 751, Social Security and Medicare Withholding Rates
On top of self-employment tax, federal income tax applies to your net profit. For 2026 the seven marginal rates run from 10 percent on a single filer’s first $12,400 of taxable income up to 37 percent on taxable income above $640,600.5Internal Revenue Service. Federal Income Tax Rates and Brackets The 2026 standard deduction is $16,100 for single filers and $32,200 for joint filers.6Internal Revenue Service. IRS Releases Tax Inflation Adjustments for Tax Year 2026
Two provisions cut the combined bill. You can deduct half of your self-employment tax as an adjustment to gross income, which reduces the income subject to income tax before you get to itemizing or the standard deduction.7Office of the Law Revision Counsel. 26 US Code 164 – Taxes And the qualified business income deduction lets many contractors deduct up to 23 percent of qualified business income starting in 2026, after recent legislation made the provision permanent and raised it from 20 percent. It phases out for certain service-based businesses (consulting, law, accounting) above specified income thresholds.8Internal Revenue Service. Qualified Business Income Deduction
The Four Payment Deadlines
The IRS divides the year into four uneven periods, each with its own due date:9Internal Revenue Service. Individuals – Estimated Tax
- April 15: covers income earned January 1 through March 31
- June 15: covers income earned April 1 through May 31
- September 15: covers income earned June 1 through August 31
- January 15 of the following year: covers income earned September 1 through December 31
The periods are not equal quarters. The second window is only two months and the third stretches to three, which catches people off guard, particularly the June deadline that arrives just two months after April. When a deadline falls on a weekend or federal holiday, it shifts to the next business day.9Internal Revenue Service. Individuals – Estimated Tax
How to Calculate Each Payment
Form 1040-ES includes a worksheet that walks you through projecting annual tax liability and splitting it into four installments.10Internal Revenue Service. About Form 1040-ES, Estimated Tax for Individuals Start with last year’s return, adjust for expected changes in income, deductions, and credits, then estimate total income tax plus self-employment tax, subtract credits and any withholding from a W-2 job, and divide the remainder by four.
If your income is irregular, the annualized installment method on Form 2210 lets you pay amounts that track when income actually arrived rather than paying equal quarterly sums. For most contractors a simpler habit works: set aside 25 to 30 percent of every payment you receive into a separate account earmarked for taxes. That range covers self-employment tax and income tax at typical brackets, though high earners should set aside more.
How to Send the Money
IRS Direct Pay is the simplest option for individual contractors. Payments come straight from a checking or savings account at no cost, and the system issues a confirmation number immediately.11Internal Revenue Service. Topic No. 202, Tax Payment Options Payments can be scheduled in advance, though each is set up individually, and there is a $10 million per-payment ceiling.
An IRS Online Account shows your balance, payment history, and payment tools in one place, and the IRS has been steering individual taxpayers toward it. Individuals can no longer create new Electronic Federal Tax Payment System (EFTPS) accounts. Existing EFTPS users can keep using the system for now, and business entities can still enroll, but new individual users should use Direct Pay or their Online Account.12Internal Revenue Service. EFTPS: The Electronic Federal Tax Payment System
Paper vouchers come with Form 1040-ES for anyone who prefers to mail a check.13Internal Revenue Service. Form 1040-ES – Estimated Tax for Individuals Each voucher matches a quarterly deadline and goes to the IRS processing center for your state. Keep copies of the check and the postmarked envelope if you use this route.
Safe Harbors That Prevent Penalties
The IRS charges a penalty when you don’t pay enough during the year. It works like interest on the shortfall, calculated per quarter at the federal short-term rate plus three points. That rate is 7 percent for early 2026 and drops to 6 percent for the second quarter.14Internal Revenue Service. Quarterly Interest Rates
Meeting any one of three safe harbors avoids the penalty entirely:15Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax
- Total tax due after withholding and credits is under $1,000.
- Estimated payments cover at least 90 percent of the current year’s total tax.
- Estimated payments equal or exceed the total tax shown on last year’s return, regardless of what you end up owing this year.
The 100 percent prior-year rule rises to 110 percent if your adjusted gross income exceeded $150,000 the prior year, or $75,000 if married filing separately.15Office of the Law Revision Counsel. 26 USC 6654 – Failure by Individual to Pay Estimated Income Tax New contractors sometimes get burned in year two: a strong first year raises the 110 percent baseline, and if income drops without an adjustment to estimates, you either overpay all year or risk penalty by underpaying.
Deductions Worth Claiming
Contractors report income and expenses on Schedule C, which attaches to Form 1040.16Internal Revenue Service. Instructions for Schedule C (Form 1040) Every legitimate business expense reduces net earnings, which lowers both self-employment tax and income tax. The obvious categories are supplies, software, and subcontractor fees. A few others get missed.
Self-employed health insurance premiums are fully deductible as an adjustment to income, not on Schedule C, if you pay for your own medical, dental, or vision coverage and aren’t eligible for a spouse’s employer plan. The plan must be established under your business, and the deduction covers your spouse, dependents, and children under 27.17Internal Revenue Service. Instructions for Form 7206
Retirement contributions do heavy lifting for higher earners. A SEP-IRA takes up to 25 percent of net self-employment earnings, capped at $72,000 for 2026.18Internal Revenue Service. SEP Contribution Limits A solo 401(k) shares the same $72,000 ceiling for those under 50, with catch-up amounts for older contributors. Contributions are fully deductible.
A home office qualifies if you use part of your home regularly and exclusively for business. You can deduct a proportional share of rent, utilities, insurance, and repairs, or use the simplified method at $5 per square foot up to 300 square feet. The kitchen table you also eat at does not qualify.
Vehicle expenses can be claimed using actual costs or the standard mileage rate. Keep a mileage log either way; the IRS scrutinizes this deduction more than most.
1099-NEC Forms and Record Keeping
Clients who pay you $2,000 or more during the tax year must send you a Form 1099-NEC by January 31 of the following year. That threshold rose from $600 to $2,000 for tax years beginning after 2025.19Internal Revenue Service. Publication 1099, General Instructions for Certain Information Returns The IRS gets a copy of every 1099-NEC, so income on those forms should match your return. If a client doesn’t send one, whether because they paid less than $2,000 or simply failed to file, you still owe tax on the income. The reporting obligation is theirs; the tax obligation is yours.
Keep income records, expense receipts, mileage logs, and payment confirmations for at least three years from the date you file. That’s the standard IRS assessment window.20Internal Revenue Service. How Long Should I Keep Records If you underreport income by more than 25 percent, the window stretches to six years, so keeping records longer is cheap protection. Digital copies are acceptable as long as they’re legible and complete.