Contract workers get paid in gross amounts, on terms negotiated before the work begins, usually by submitting an invoice that the client pays through ACH, wire, a digital platform, or check. No taxes come out on the way in, so the full payment lands in your account and the full tax bill lands on you. How much you earn depends on the pricing model in your contract; when the money actually shows up depends on the payment terms; and how much you keep depends on what you set aside for federal taxes and quarterly estimated payments.
How Your Rate Is Structured
Most contractor agreements use one of four pricing models, and the right one depends on how predictable the scope is and how much financial risk each side is willing to carry.
Hourly
You track every hour and bill accordingly. Your rate has to cover more than your time — it needs to absorb overhead, health insurance, and self-employment tax. The client carries the risk that a project runs long, provided your hours are backed by clear records. Time-tracking software that exports clean logs speeds up invoicing and gives the client something concrete to approve.
Fixed Price
A flat fee for a defined deliverable. If you build a website for $8,000, that’s what you earn whether it takes two weeks or two months. The risk sits on you: finish fast and your effective rate looks great; hit scope creep and your margins vanish. Vague scope language is where most fixed-price disputes start, so define the deliverable precisely before signing.
Retainer
A recurring payment, usually monthly, in exchange for guaranteed availability. You might agree to 20 hours of consulting per month for $5,000, with anything beyond that billed at a pre-negotiated overflow rate. Retainers give you the closest thing to predictable income without being on payroll, and they work best for ongoing advisory relationships rather than one-off projects.
Value-Based
Your fee tracks the outcome rather than the hours. If a marketing strategy is projected to generate $500,000 in new revenue, charging $50,000 for that work reflects its value rather than the 80 hours it took. This tends to work for experienced contractors with a track record, since the client is paying for results and trusting your process.
When the Money Actually Arrives
The pricing model tells you how much. The payment terms in your contract tell you when.
Net 30 is the most common term. It gives the client 30 calendar days from the date they receive your invoice to send payment. Net 60 gives them 60. Assume every client will use the full window: if you offer Net 30, plan on day 30, not day 10. Negotiating shorter terms like Net 15 or Net 10 can help cash flow, but larger companies with rigid accounts-payable cycles may not budge.
Marking an invoice “due upon receipt” means the client should pay within one business day. It speeds up cash flow and removes ambiguity, but some smaller clients find it aggressive. If you use this term, spell it out in the contract before work begins rather than introducing it on the invoice.
Milestone schedules break the total contract value into chunks tied to specific deliverables. A common structure is 25% to 50% upfront, with subsequent payments triggered by draft submissions, phase completions, or final approval. This is the safest approach for large projects because neither side carries all the risk. You get paid as you deliver, and the client only releases funds against visible progress.
The Paperwork That Has to Be in Place First
Before any money moves, the hiring company needs your tax information on file. Without it, most accounting departments will block payment entirely, because federal reporting rules make it necessary.
Form W-9
Every U.S.-based contractor fills out IRS Form W-9 at the start of an engagement. It collects your legal name, business address, and taxpayer identification number, either your Social Security number or an EIN.1Internal Revenue Service. Form W-9 (Rev. March 2024) The company uses that information to file a 1099-NEC at year-end for any contractor who received $600 or more, with a filing deadline of January 31.2Internal Revenue Service. General Instructions for Certain Information Returns (2025)
Get the W-9 right the first time. If your TIN doesn’t match IRS records, the company is required to withhold 24% of every payment and send it to the IRS under backup withholding rules.3Internal Revenue Service. Publication 15 (2026), (Circular E), Employers Tax Guide You’d eventually get credit for that on your return, but you’d be operating on 76 cents of every dollar in the meantime.
Form W-8BEN for Foreign Contractors
Non-U.S. contractors fill out Form W-8BEN instead. It establishes your foreign status and lets you claim any tax treaty benefits that might reduce the withholding rate.4Internal Revenue Service. Instructions for Form W-8BEN One exception: a nonresident performing services physically in the United States should file Form 8233. U.S. citizens working abroad still use the W-9.
Invoicing
Your invoice is your formal request to get paid. At minimum it needs your contact information, a unique invoice number, itemized services with dates, the total due, and your payment terms. Clear line items prevent the most common cause of payment delay: an accounting clerk who can’t match your invoice to the original contract and sends it back for clarification. Put your bank details or preferred payment method on the invoice itself so nobody has to chase you for routing numbers.
How the Money Moves
ACH Direct Deposit
The Automated Clearing House network is the most widely used system for contractor payments. You give the client your routing number and account number, and the transfer settles within one banking day, sometimes two.5Nacha. How ACH Payments Work Same-Day ACH is also available, with a per-transaction limit of $1,000,000, which covers almost every contractor payment.6Federal Reserve Services. Same Day ACH Frequently Asked Questions ACH is free or near-free for the sender, which is why most companies prefer it.
Wire Transfers
Wires settle faster, often the same business day, but they carry fees. Domestic outgoing wires typically run $25 to $30, and international wires cost $50 or more depending on the bank. Wires make sense for large international payments where the fee is a rounding error. For international transfers, the client will also need your SWIFT or BIC code.
Digital Payment Platforms
PayPal, Stripe, and similar services deliver near-instant notification, but they charge transaction fees that typically run 2.3% to 3.5% per payment depending on the platform and method. Whether you or the client absorbs those fees should be addressed in your contract. These platforms work well for smaller payments and international relationships where setting up direct bank transfers isn’t worth the hassle.
Paper Checks
Some clients still pay by check, especially smaller businesses and government agencies. Checks are slow. Build in mail time plus the time your bank takes to clear the deposit, and factor that lag into your cash flow planning.
What Comes Out Before You Keep It
Nobody withholds taxes from your payments, so the full amount you receive is not the amount you keep. The IRS expects you to pay as you go, the same way an employer would withhold from a paycheck, except you handle it yourself.7Internal Revenue Service. Independent Contractor (Self-Employed) or Employee
Self-Employment Tax
On top of regular income tax, contractors owe self-employment tax to cover Social Security and Medicare. The combined rate is 15.3%: 12.4% for Social Security and 2.9% for Medicare.8Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes) Employees pay only half because their employer covers the other half. Contractors pay both halves. You can deduct the employer-equivalent portion (7.65%) when calculating your adjusted gross income.
The 12.4% Social Security portion applies only to net earnings up to $184,500 in 2026.9Social Security Administration. What Is the Current Maximum Amount of Taxable Earnings for Social Security The 2.9% Medicare portion has no cap. If your net self-employment income exceeds $200,000 (or $250,000 married filing jointly), you also owe an additional 0.9% Medicare surcharge on the amount above that threshold.8Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)
Quarterly Estimated Payments
If you expect to owe $1,000 or more in tax for the year after subtracting withholding and credits, the IRS requires quarterly estimated payments rather than waiting until April.10Internal Revenue Service. Estimated Taxes The 2026 deadlines are:
- First quarter (January–March income): April 15, 2026
- Second quarter (April–May income): June 15, 2026
- Third quarter (June–August income): September 15, 2026
- Fourth quarter (September–December income): January 15, 2027
Deadlines shift to the next business day when they fall on a weekend or federal holiday. Skip a quarter or pay too little and the IRS charges an underpayment penalty. The easiest way to avoid that is the safe harbor rule: pay at least 100% of what you owed last year, split into four equal installments. If your adjusted gross income last year exceeded $150,000, the safe harbor bumps to 110% of last year’s tax.11Internal Revenue Service. Underpayment of Estimated Tax by Individuals Penalty
Most contractors set aside 25% to 30% of every payment in a separate account dedicated to taxes. The exact percentage depends on your total income and filing status, but undershooting is far more painful than overshooting. Overpayments come back as a refund.
Building Payment Protection Into Your Contract
Getting stiffed is an occupational hazard, and the best defenses go into the contract before work starts. Chasing money after the fact is always harder than preventing the problem up front.
A late-fee clause gives you leverage when a client drags. The industry standard is roughly 1.5% per month on the outstanding balance, or about 18% annually. Courts generally consider that range reasonable. Set the rate much higher, say 5% per month, and it risks being challenged as an unenforceable penalty. Your contract should also specify when the late fee kicks in (typically 30 days past the invoice date) and how it’s calculated.
A kill-fee clause protects you if a client cancels after you’ve already invested time. Without one, you could spend weeks on a project only to have the client walk away owing you nothing for work that’s useless to anyone else. Kill fees belong in every fixed-price and milestone-based contract.
Upfront deposits add another layer of protection. Requiring 25% to 50% of the project fee before you start ensures you’re not financing the client’s project with your own time. For new client relationships, experienced contractors lean toward the higher end.
If a payment goes past due, start with a polite reminder. Invoices genuinely slip through the cracks sometimes. If that goes nowhere, send a formal written notice that references the overdue amount, how long it’s been outstanding, and what happens next: late fees, suspension of work, further collection. Keep the tone professional; threats you don’t intend to follow through on undermine your credibility. A demand letter from an attorney often produces results when your emails haven’t. For smaller debts, small claims court is available in every state and doesn’t require a lawyer. Save every email, text, and document throughout; written acknowledgment of the debt from the client strengthens your position considerably if you end up in court.
Federal Government Contracts Are Different
Contractors working for the federal government have a statutory protection the private sector doesn’t: the Prompt Payment Act. Federal agencies that fail to pay by the required date must pay interest on the late amount.12Office of the Law Revision Counsel. United States Code Title 31 – Section 3902 Interest Penalties The Treasury Department sets the rate and adjusts it every six months. For the first half of 2026, it’s 4.125%.13Federal Register. Prompt Payment Interest Rate; Contract Disputes Act
Interest accrues automatically starting the day after payment was due, and the agency must pay it without the contractor requesting it, for any interest penalty of $1.00 or more. Temporary unavailability of funds does not eliminate the obligation. Private-sector clients, by contrast, owe you only what your contract says they owe, which is why the late-fee language in your agreement matters.
If You’re Actually an Employee, This All Changes
Not every worker labeled a “contractor” is actually one. The IRS and the Department of Labor use an economic reality test to determine whether a worker is genuinely in business for themselves or is economically dependent on the hiring company, which would make them an employee regardless of what the contract says.14U.S. Department of Labor. Fact Sheet 13 – Employment Relationship Under the Fair Labor Standards Act (FLSA) If the company controls when, where, and how you work, provides your tools, and you don’t serve other clients, you may be misclassified.
Misclassification affects how you get paid and how much you keep. Employees are entitled to minimum wage protections, overtime pay, employer-paid payroll taxes, and unemployment insurance. Contractors get none of those. If you believe you’ve been misclassified, you can file Form SS-8 with the IRS to request a formal determination of your worker status, and use Form 8919 on your return to report and pay only the employee’s share of Social Security and Medicare rather than the full self-employment tax amount.7Internal Revenue Service. Independent Contractor (Self-Employed) or Employee The determination process takes at least six months, but a favorable ruling means you’d owe roughly half the payroll taxes you’ve been paying on your own.