To pay independent contractors through payroll, you collect a signed Form W-9 and bank details before the first payment, run each payment as a gross ACH transfer through your platform’s contractor pipeline with no tax withholding or FICA, and file Form 1099-NEC by January 31 for anyone you paid $600 or more during the year. The mechanics are simpler than an employee payroll run. The traps sit around it: classification, cadence, expense handling, and year-end reporting.
Confirm the Worker Is Actually a Contractor
Before you enter anyone into a contractor payment module, be confident they qualify as an independent contractor. The IRS weighs three categories in Publication 15-A: behavioral control (how much you direct when, where, and how the work is done), financial control (whether the worker invests in their own tools, markets to other clients, and bears profit-or-loss risk), and the type of relationship (written contract terms, whether you provide benefits like health insurance or paid leave).1Internal Revenue Service. Publication 15-A, Employer’s Supplemental Tax Guide No single factor decides it. The Department of Labor applies its own test under the Fair Labor Standards Act, focused on whether the worker is economically dependent on your business or genuinely running their own.2U.S. Department of Labor. Misclassification of Employees as Independent Contractors Under the Fair Labor Standards Act As of early 2026, the DOL has proposed a streamlined five-factor analysis that gives extra weight to control and to the worker’s opportunity for profit or loss, and it has stated it is no longer applying its 2024 rule in investigations.3U.S. Department of Labor. Notice of Proposed Rule – Employee or Independent Contractor Classification Under the Fair Labor Standards Act
If you genuinely can’t tell, either you or the worker can file Form SS-8 with the IRS for an official determination.4Internal Revenue Service. About Form SS-8, Determination of Worker Status for Purposes of Federal Employment Taxes and Income Tax Withholding It takes months, so don’t wait until an audit is already underway.
Collect the Paperwork Before the First Payment
Form W-9
Every domestic contractor should complete Form W-9 before you pay them. The form captures legal name, taxpayer identification number (SSN or EIN), business entity type, and address, and the contractor signs under penalty of perjury.5Internal Revenue Service. Forms and Associated Taxes for Independent Contractors Most payroll platforms have a built-in W-9 collection workflow that sends the form electronically and stores the returned copy.
Verify the TIN
Check that the name and TIN on the W-9 match IRS records. If they don’t when you eventually file a 1099-NEC, you’ll receive a CP2100 or CP2100A notice requiring you to begin backup withholding at 24% on future payments.6Internal Revenue Service. Backup Withholding “B” Program The same 24% applies if the contractor refuses to provide a TIN.7Internal Revenue Service. Publication 15, Employer’s Tax Guide (2026) Catching a mismatch now is far easier than filing corrections later.
Banking Details
For electronic payment, collect the contractor’s routing and account numbers, usually from a voided check or a bank verification letter. Payroll platforms store this information in encrypted fields and use it to initiate ACH transfers at payment time.
How the Payment Itself Runs
Adding a W-2 employee to payroll triggers automatic federal income tax withholding, employee-side FICA, and tracking of the employer’s matching contribution. None of that happens for a contractor. The contractor module sends the full gross amount you enter because the contractor is responsible for their own income and self-employment taxes.
The workflow is short. Select the contractor from your database, enter the gross dollar amount from their invoice, and assign a payment date. There is no tax calculation step because nothing is being withheld. Review the transaction summary against the invoice, confirm the amount, and submit.
Once submitted, the platform initiates an ACH transfer. A common misconception is that ACH takes three to five business days. Nacha, which governs the ACH network, reports that roughly 80% of ACH payments settle within one business day or less.8Nacha. The Significant Majority of ACH Payments Settle in One Business Day — or Less Some platforms batch submissions on a delayed schedule, which can add a day. The system generates a digital receipt for each payment and updates the running annual total for the contractor, which is what will drive your year-end 1099-NEC.
Keep the Cadence From Looking Like a Salary
The convenience of a single platform can blur the line between employees and contractors if you aren’t careful. Running contractor payments on the same biweekly schedule as employees, for the same fixed amount every time, can look like a salary arrangement to an auditor and undermine the classification. The safer pattern is per-invoice payment at irregular intervals tied to project milestones. Most payroll platforms keep contractor records in a separate database from employee records; use that separation intentionally.
Year-End Reporting: Form 1099-NEC
If you paid a contractor $600 or more during the calendar year, federal law requires you to file Form 1099-NEC reporting the total.9Office of the Law Revision Counsel. 26 USC 6041A – Returns Regarding Payments of Remuneration for Services and Direct Sales One copy goes to the contractor, another to the IRS. Payroll platforms generate these automatically from the year’s payment data.
The deadline is January 31 of the following year for both the recipient copy and the IRS copy. When January 31 falls on a weekend or holiday, the deadline shifts to the next business day.10Internal Revenue Service. Instructions for Forms 1099-MISC and 1099-NEC Unlike some other information returns, there is no extended electronic filing window.
Late-filing penalties escalate. For returns due in 2026, the IRS charges $60 per form filed within 30 days of the deadline, $130 per form filed between 31 days late and August 1, and $340 per form filed after August 1 or not at all.11Internal Revenue Service. Information Return Penalties Intentional disregard raises the penalty to $680 per form. Across dozens of contractors, those numbers compound fast.
Reimbursing Business Expenses Without Inflating the 1099
If your contract requires the contractor to spend money on your behalf (travel, materials, specialized software), how you handle the reimbursement determines whether it counts as taxable income. Under the IRS accountable plan rules, a reimbursement is excluded from the contractor’s income, and from your 1099-NEC total, when three conditions are met: the expense has a clear business connection, the contractor provides adequate documentation such as receipts within a reasonable time, and any excess is returned to you.
When those conditions aren’t met, the reimbursement is treated as additional compensation and gets included in the 1099-NEC total. Lump-sum “expense allowances” without substantiation are taxable compensation. If you plan to reimburse expenses, build the receipt and documentation process directly into the contract.
A Word on the Contractor’s Own Tax Obligations
Contractors owe self-employment tax on their net earnings at 15.3%, made up of 12.4% for Social Security on earnings up to $184,500 in 2026 and 2.9% for Medicare on all net earnings.12Internal Revenue Service. Self-Employment Tax (Social Security and Medicare Taxes)13Social Security Administration. Contribution and Benefit Base They also owe quarterly estimated payments to the IRS if they expect to owe $1,000 or more for the year; underpayment triggers a penalty even if they end up due a refund.14Internal Revenue Service. 15Internal Revenue Service. About Form W-8 BEN, Certificate of Foreign Status of Beneficial Owner for United States Tax Withholding and Reporting Without a treaty exemption, you must withhold 30% of the gross payment on U.S.-sourced income paid to a nonresident alien before sending the funds.16Office of the Law Revision Counsel. 26 USC 1441 – Withholding of Tax on Nonresident Aliens That is a mandatory deduction, a significant departure from the zero-withholding approach used for domestic contractors. If the contractor performs all work outside the United States, the income generally is not U.S.-sourced and withholding does not apply, but keep documentation to support that position.
Foreign contractor payments are reported on Form 1042-S rather than 1099-NEC. The filing deadline, and the deadline to furnish a copy to the contractor, is March 15 of the following year.17Internal Revenue Service. Instructions for Form 1042-S (2026) Not every payroll platform handles 1042-S filing natively. Confirm the capability before onboarding foreign contractors through payroll.
What Getting Classification Wrong Costs You
If the IRS or DOL later determines that a contractor was actually an employee, the business becomes liable for the federal income tax that should have been withheld, plus both the employer and employee shares of Social Security and Medicare taxes, back to when the misclassification began.18Internal Revenue Service. Worker Classification 101 – Employee or Independent Contractor Interest accrues on all of it, and the IRS can add penalties for failure to withhold and failure to file the correct employment tax returns.
A longstanding relief provision known as Section 530 can eliminate that federal employment tax liability, but only if you filed all required 1099s consistently treating the worker as a non-employee, never treated anyone in a substantially similar role as an employee, and had a reasonable basis for the classification (such as a prior IRS audit, a published ruling, recognized industry practice, or professional tax advice). All three must be satisfied.
State-level exposure often runs deeper than the federal side. A worker reclassified as an employee may be entitled to unpaid overtime, benefits, unemployment insurance contributions, and workers’ compensation coverage, and several states apply classification tests stricter than the federal standard. If you operate in multiple states, classification is not a one-time exercise. Some states also require you to report newly engaged contractors to a state agency within a specific window after the first payment, similar to new-hire reporting for employees. Check your state workforce agency for the threshold and deadline, and confirm whether your payroll platform automates the filing before assuming it does.