As an independent contractor, you’ll use a small stack of federal tax forms: Form W-9 to give clients your taxpayer information, Forms 1099-NEC and 1099-K to receive reports of what they paid you, Schedule C to report your business income and expenses, Schedule SE to calculate Social Security and Medicare, Form 1040-ES to make quarterly estimated payments, and Form 1040 to file your annual return in April. Each one has a specific job, and together they replace the W-2 and payroll withholding an employee would rely on.
Forms Your Clients Send You
Before you’re paid, most clients will ask you to complete Form W-9. It collects your name, address, and taxpayer identification number, usually your Social Security number or an Employer Identification Number if you have one.1Internal Revenue Service. About Form W-9 – Request for Taxpayer Identification Number and Certification The client needs this to report your payments to the IRS. Skip the W-9 or provide bad information and the client is required to withhold 24% of what they pay you as backup withholding.2Internal Revenue Service. Publication 15, Employer’s Tax Guide
Form 1099-NEC
After the year ends, each client who paid you enough during the year sends you Form 1099-NEC (Nonemployee Compensation), and files the same information with the IRS. Starting in 2026, that threshold is $2,000, raised from $600 under the One Big Beautiful Bill, with inflation adjustments beginning in 2027.3Internal Revenue Service. 2026 Publication 1099
The higher threshold means fewer 1099s in your mailbox, but it doesn’t change what you owe. You report all your business income on your return regardless of whether a 1099 arrives. A $1,500 payment with no form still belongs on your Schedule C, and the IRS matches reported income against your return.
Form 1099-K
Payments routed through third-party platforms like PayPal, Venmo, or credit card processors may generate Form 1099-K instead. Under current rules, a payment processor must issue a 1099-K when gross payments through the platform exceed $20,000 and you have more than 200 transactions in the year.4Internal Revenue Service. IRS Issues FAQs on Form 1099-K Threshold Under the One, Big, Beautiful Bill; Dollar Limit Reverts to $20,000 When a payment is reported on a 1099-K, the client generally won’t also report it on a 1099-NEC. Don’t count the same dollars twice.
Schedule C: Reporting Business Income and Expenses
Schedule C (Form 1040) is the profit-and-loss statement for your contracting work. You enter gross receipts (every dollar you earned, whether reported on a 1099 or not), subtract ordinary and necessary business expenses, and arrive at net profit or loss.5Internal Revenue Service. Schedule C (Form 1040) – Profit or Loss From Business That net figure flows two places: onto Form 1040 as income, and onto Schedule SE as the base for self-employment tax.
Schedule C has line items for dozens of expense categories. A few that come up most often:
- Vehicle expenses for business miles driven (not commuting). For 2026, the standard mileage rate is 72.5 cents per mile, or you can track actual costs and deduct the business-use percentage.6Internal Revenue Service. IRS Notice 2026-10 – 2026 Standard Mileage Rates
- Home office, if part of your home is used exclusively and regularly as your main place of business. The simplified method allows $5 per square foot, up to 300 square feet ($1,500 maximum); the actual-expense method deducts a business-use percentage of rent, utilities, insurance, and repairs.7Internal Revenue Service. Simplified Option for Home Office Deduction
- Supplies, software subscriptions, professional liability insurance, advertising, and fees paid to accountants or attorneys for business purposes. The test is whether the expense is ordinary in your line of work and necessary for the business.
Health insurance premiums for yourself, your spouse, and dependents are also deductible at 100% for the self-employed, but that deduction is taken as an above-the-line adjustment on Schedule 1 of Form 1040, not on Schedule C.8Internal Revenue Service. 2025 Instructions for Form 7206 It can’t exceed your net self-employment earnings, and you can’t claim it for any month you were eligible for an employer plan through your own or a spouse’s job.
Schedule SE: Self-Employment Tax
Because no employer is splitting payroll taxes with you, Schedule SE calculates both halves yourself. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.9Internal Revenue Service. IRS Schedule SE (Form 1040) – Self-Employment Tax
You don’t pay 15.3% on your entire Schedule C net profit. Schedule SE first multiplies net earnings by 92.35%, mirroring the fact that employees don’t pay FICA on their employer’s share. So $100,000 of net profit produces self-employment tax calculated on $92,350.
The Social Security portion caps out at the annual wage base, which is $184,500 for 2026.10Social Security Administration. Contribution and Benefit Base Earnings above that stay subject to the 2.9% Medicare tax, which has no ceiling. If your self-employment income exceeds $200,000 (single) or $250,000 (married filing jointly), an Additional Medicare Tax of 0.9% applies to the excess.11Internal Revenue Service. Topic no. 560, Additional Medicare Tax
Once you’ve calculated the total, you deduct half of it as an above-the-line adjustment on Form 1040. That reduces your adjusted gross income and your income tax, though it doesn’t reduce the self-employment tax itself.
Form 1040-ES: Paying Throughout the Year
Nobody withholds tax from your contractor pay, so the IRS expects you to pay as you earn. Form 1040-ES is how you do it. If you expect to owe $1,000 or more for the year after any withholding and refundable credits, quarterly estimated payments are required.12Internal Revenue Service. Form 1040-ES – Estimated Tax for Individuals These payments cover both income tax and self-employment tax.
Form 1040-ES includes a worksheet to estimate what you’ll owe and payment vouchers for anyone who mails checks. The four due dates for 2026 income are:
- April 15, 2026 (January through March)
- June 15, 2026 (April and May)
- September 15, 2026 (June through August)
- January 15, 2027 (September through December)
When a date falls on a weekend or federal holiday, the deadline moves to the next business day. You can pay online through IRS Direct Pay or EFTPS instead of mailing vouchers. Underpaying triggers a penalty, but you avoid it by meeting a safe harbor: paying at least 90% of your current-year tax or 100% of last year’s tax (110% if your prior-year AGI exceeded $150,000, or $75,000 married filing separately), whichever is smaller.13Internal Revenue Service. Topic no. 306, Penalty for Underpayment of Estimated Tax
Form 1040: Where Everything Lands
Everything closes out on Form 1040, your annual income tax return. Your Schedule C net profit enters the income section. Your Schedule SE self-employment tax gets added to your total tax. The deduction for half your self-employment tax, your self-employed health insurance premiums, and any contributions to a SEP IRA or Solo 401(k) reduce your adjusted gross income on Schedule 1.14Internal Revenue Service. About Form 1040, U.S. Individual Income Tax Return
Sole proprietors may also deduct up to 20% of qualified business income under Section 199A, made permanent by the One Big Beautiful Bill. It’s taken on Form 1040 after AGI and doesn’t reduce your self-employment tax.15Internal Revenue Service. Qualified Business Income Deduction Once your total tax is calculated, it’s compared against your quarterly payments and any withholding. If you paid more than you owe, you get a refund. If you paid less, the balance is due when you file.
For the 2025 tax year, filed in 2026, the deadline is April 15, 2026. Need more time? File Form 4868 for an automatic six-month extension to file. It doesn’t extend the time to pay, though. Anything you owe is still due April 15, and interest accrues on the unpaid balance after that.16Internal Revenue Service.