To file taxes as a 1099 employee, you report your business income and expenses on Schedule C, calculate self-employment tax on Schedule SE, and attach both to your Form 1040. Because no one withholds tax from your pay, you also send the IRS estimated payments four times a year and cover both halves of Social Security and Medicare tax yourself. One thing to know up front: “1099 employee” is a common phrase but not an accurate one. If you receive a Form 1099-NEC rather than a W-2, the IRS treats you as an independent contractor, and the tax rules below are the ones that apply.
The Forms You’ll File
Three forms carry most of the work:
- Schedule C, Profit or Loss From Business, where you list all your self-employment income and deductible expenses. The bottom line is your net profit or loss.
- Schedule SE, where you calculate self-employment tax on that net profit.
- Form 1040, your regular individual return, which pulls in the Schedule C profit and the Schedule SE tax.
Schedule 1 also comes into play as the place where you claim adjustments like the deduction for half your self-employment tax and the self-employed health insurance deduction. Estimated payments you made during the year get credited in the payments section of the 1040.
Reporting Your Income
Any client that pays you $600 or more during the year should send you a Form 1099-NEC by the end of January.1Internal Revenue Service. Reporting Payments to Independent Contractors You have to report all of your self-employment income, though, including money from clients who don’t issue a 1099. If you collect payment through a third-party platform like PayPal or Venmo, the platform files a Form 1099-K when your gross payments top $20,000 and you have more than 200 transactions in the year.2Internal Revenue Service. IRS Issues FAQs on Form 1099-K Threshold Under the One, Big, Beautiful Bill; Dollar Limit Reverts to $20,000
Total everything up on the income section of Schedule C. Not receiving a 1099 doesn’t mean the income is invisible to the IRS, and it doesn’t excuse leaving it off your return.
Deducting Business Expenses
You can deduct any expense that’s ordinary and necessary for your line of work. Software subscriptions, advertising, office supplies, professional fees, the business portion of your phone and internet, continuing education related to your trade — all of it goes on Schedule C and reduces your net profit dollar-for-dollar. Keep receipts, invoices, bank statements, and mileage logs. Without documentation, the IRS can disallow deductions in an audit and tack on accuracy penalties.
Vehicle Expenses
If you drive your own car for work, you have two options. The standard mileage rate is the simpler one: multiply your business miles by the IRS rate, which is $0.725 per mile for 2026.3Internal Revenue Service. IRS Sets 2026 Business Standard Mileage Rate at 72.5 Cents Per Mile, Up 2.5 Cents The actual-expense method involves tracking gas, insurance, repairs, and depreciation and then deducting the business-use percentage. Mileage is easier; actual expenses sometimes produce a bigger deduction if your vehicle costs are high relative to how much you drive.
Home Office
If you use part of your home exclusively and regularly as your principal place of business, you qualify for the home office deduction. The simplified method gives you $5 per square foot up to 300 square feet, capping the deduction at $1,500.4Internal Revenue Service. Simplified Option for Home Office Deduction The regular method takes the percentage of your home used for business and applies it to rent or mortgage interest, utilities, insurance, and depreciation. More paperwork, but often a larger deduction.
Self-Employment Tax
This is the piece most new contractors don’t see coming. As a contractor, you pay both the employer and employee sides of Social Security and Medicare. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.5Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) You owe it any time your net self-employment earnings reach $400 or more.6Internal Revenue Service. Instructions for Schedule SE (Form 1040) (2025)
The 15.3% rate doesn’t apply to your full net profit. You multiply net earnings by 92.35% first, then apply the rate.7Internal Revenue Service. Topic No. 554, Self-Employment Tax So $100,000 in Schedule C profit becomes $92,350 for the self-employment tax calculation.
The 12.4% Social Security portion only applies to earnings up to the annual wage base, which is $184,500 for 2026.8Social Security Administration. Contribution and Benefit Base Anything above that is exempt from Social Security tax but still subject to the 2.9% Medicare portion, which has no cap. If your self-employment income exceeds $200,000 ($250,000 if married filing jointly), an additional 0.9% Medicare tax applies to the excess.9Office of the Law Revision Counsel. 26 USC 1401 – Rate of Tax
The one break: you can deduct half of your self-employment tax as an adjustment to income on Schedule 1. That lowers your adjusted gross income and reduces your income tax, though it doesn’t touch the self-employment tax itself.5Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
Estimated Quarterly Payments
Because no employer withholds from your 1099 income, you send the IRS estimated payments four times a year. Payments are mandatory if you expect to owe $1,000 or more in combined income tax and self-employment tax after withholding and refundable credits.10Internal Revenue Service. Estimated Taxes
The due dates:
- April 15 for income earned January through March
- June 15 for April and May
- September 15 for June through August
- January 15 of the following year for September through December
When a due date falls on a weekend or holiday, it moves to the next business day.11Internal Revenue Service. Individuals 2 IRS Direct Pay and EFTPS are both faster and more reliable than mailing a voucher.
The Safe Harbor
You can avoid the underpayment penalty entirely by meeting one of two safe harbors: pay at least 90% of the current year’s total tax, or pay at least 100% of last year’s total tax, whichever is smaller. If your prior-year adjusted gross income exceeded $150,000 ($75,000 if married filing separately), the prior-year figure rises to 110%.12Internal Revenue Service. Estimated Tax The prior-year safe harbor is the easier one in practice, because you already know the number. Divide last year’s total tax (or 110% of it) by four, pay that each quarter, and you’re penalty-proof no matter what this year looks like.
Deductions Beyond Schedule C
Some of the biggest tax savings for contractors sit outside Schedule C, as adjustments to income or deductions taken on Form 1040 itself.
Retirement Contributions
Self-employed retirement plans are one of the strongest tax tools you have. Two common options:
- A SEP IRA lets you contribute up to 25% of your net self-employment earnings (after deducting half your self-employment tax), capped at $72,000 for 2026. Contributions are deductible, and setup is straightforward.13Internal Revenue Service. SEP Contribution Limits (Including Grandfathered SARSEPs)
- A Solo 401(k) lets you defer up to $24,500 as an employee contribution, plus employer profit-sharing contributions of up to 25% of net compensation. Combined total tops out at $72,000 if you’re under 50. Ages 50 to 59 and 64-plus get an $8,000 catch-up on the employee side; ages 60 to 63 get $11,250.14Internal Revenue Service. 2026 Amounts Relating to Retirement Plans and IRAs, as Adjusted
The Solo 401(k) usually shelters more income at lower earnings because of the employee deferral. The SEP IRA is simpler to run.
Health Insurance Premiums
If you pay for your own health insurance and aren’t eligible for coverage through a spouse’s employer, you can deduct 100% of the premiums for yourself, your spouse, and your dependents. Dental and a limited amount of long-term care coverage count too. It’s claimed on Schedule 1, so you get it whether you itemize or not.15Internal Revenue Service. Instructions for Form 7206 (2025) The deduction can’t exceed your net self-employment profit for the year, and it doesn’t apply to any month you were eligible for an employer-subsidized health plan.
Qualified Business Income Deduction
Section 199A allows eligible sole proprietors to deduct up to 20% of qualified business income, which is essentially your Schedule C net profit minus certain adjustments.16Internal Revenue Service. Qualified Business Income Deduction The deduction was made permanent by the One, Big, Beautiful Bill Act, so it remains available for 2026. It’s taken on Form 1040 after AGI, so it reduces income tax but not self-employment tax. Above $200,000 in taxable income for single filers in 2026, the deduction begins to phase out for certain service businesses like consulting, law, and health care.17Office of the Law Revision Counsel. 26 US Code 199A – Qualified Business Income
Deadlines, Extensions, and Late Penalties
The annual return is due April 15. If you need more time, Form 4868 gives you an automatic six-month extension to October 15, no explanation required.18Internal Revenue Service. Application for Automatic Extension of Time to File US Individual Income Tax Return You can also trigger the extension without the form by making an electronic payment through Direct Pay or EFTPS and marking it as an extension payment.
An extension to file is not an extension to pay. Your tax liability is still due April 15, and interest and the failure-to-pay penalty run from that date on anything unpaid.
Two separate penalties apply when you miss the deadline, and they stack:
- Failure to file: 5% of the unpaid tax for each month or partial month the return is late, up to 25%. If your return is more than 60 days late, the minimum is $525 or the full tax owed, whichever is less.19Internal Revenue Service. Failure to File Penalty
- Failure to pay: 0.5% of the unpaid tax per month, also capped at 25%. If you set up an IRS installment agreement, the rate drops to 0.25% per month.20Internal Revenue Service. Failure to Pay Penalty
The failure-to-file penalty is ten times the failure-to-pay penalty, which is why filing on time matters even when you can’t pay the full balance. File the return, pay what you can, and set up a payment plan for the rest.
Keeping Your Records
The IRS can audit a return for three years after you file, so hold on to receipts, invoices, mileage logs, bank statements, and any other supporting documentation at least that long.21Internal Revenue Service. How Long Should I Keep Records? For equipment or property you depreciate on Schedule C, keep purchase records and depreciation schedules until the statute of limitations closes on the year you sell or dispose of the asset. A three-year floor covers most contractors, but a six-year default gives you more room if an audit lands unexpectedly.