Contractor onboarding checklist: tax form, agreement, insurance and classification file

An independent contractor is a person or business you pay for results, who controls how the work gets done. Onboarding one is lighter than hiring an employee, but the file has to show that the relationship really is a contracting one.

Some employee paperwork does not belong here. USCIS lists independent contractors among the people an employer does not complete Form I-9 for (USCIS Handbook for Employers M-274, 2.0 Who Must Complete Form I-9). Form W-4 is also an employee form; the contractor gives you a W-9 instead.

For a supplier company rather than an individual, the vendor onboarding checklist fits better.

The contractor completes and signs the W-9, signs the agreement, and supplies the insurance certificate through its broker and any license from its state board. The hiring manager writes the statement of work. Finance or HR keeps the file, records why the worker is classified as a contractor, and files any state report.

1. Write the statement of work first: deliverables, dates, rate and who signs off on invoices.
2. Send the request email with the agreement, a blank Form W-9 and your invoice rules.
3. Record the classification reasons in the file before the start date.
4. File the state contractor report if your state has one.
5. Set up access with an end date, and flag the contractor for year-end reporting.

• Handing a contractor the employee packet, with Form W-4 and Form I-9.
• Starting work before the agreement and the W-9 are signed.
• No written reason for treating the person as a contractor, so the file cannot answer an audit.
• Agreements that leave out intellectual property assignment.
• Accounts and system access that stay open after the last invoice.

One file per contractor, built in this order. The owner column tells your team who chases each item.

The label in the agreement does not settle the question. The IRS weighs evidence in three groups: behavioral control, financial control, and the type of relationship (IRS, Independent contractor (self-employed) or employee?). Note a line or two on each, for example who sets the hours, who supplies tools, and whether the person works for other clients.

Wage and hour law asks a separate question. The Department of Labor says employers are responsible for determining whether a worker is an employee under the FLSA, and that misclassification means treating an employee as a contractor (U.S. Department of Labor, Misclassification of Employees as Independent Contractors). When the answer is unclear, either party can ask the IRS for a ruling on Form SS-8 (IRS, Independent contractor (self-employed) or employee?).

A statement of work is the project-level document that sets deliverables, dates and price under the main agreement. Keep one per project so each invoice can be tied to it.

• Scope, deliverables and acceptance of the work.
• Rate, invoicing and payment terms.
• Term and how either side can end it.
• Assignment of intellectual property to your company.
• Confidentiality, and data handling where client data is involved.
• The contractor’s own insurance, tools and taxes.

Collect the W-9 before you pay, then check the name and TIN. The IRS requester instructions cover backup withholding and the TIN Matching service for payers (IRS, Instructions for the Requester of Form W-9).

For 2025 payments, the line was $600 (IRS, Instructions for Forms 1099-MISC and 1099-NEC (Rev. 2025)). For tax years beginning after 2025, nonemployee compensation of $2,000 or more is reported on Form 1099-NEC (IRS, Instructions for Forms 1099-MISC and 1099-NEC). The threshold may be adjusted for inflation from 2027, so check the instructions each year (IRS, Instructions for Forms 1099-MISC and 1099-NEC).

A contractor outside the U.S. gives you a W-8 form instead of a W-9. An individual uses Form W-8BEN (IRS, About Form W-8BEN). A foreign company uses Form W-8BEN-E (IRS, About Form W-8BEN-E).

Some states want to hear about contractors much sooner. In California, for example, you report a contractor to EDD within 20 calendar days once you pay $600 or more, or sign a contract for that amount (California EDD, Independent Contractor Reporting). Check whether your state has a similar rule, which is why the file records where the contractor lives or works.

Close the file as carefully as you opened it. Offboarding is the set of steps that ends access, settles payment and archives the file. These steps also keep year-end reporting clean:

1. Remove system and building access on the last day.
2. Collect equipment, files and client materials.
3. Pay the final invoice and mark the contractor inactive.
4. Keep the agreement, W-9 and classification notes with your tax records.

• USCIS Handbook for Employers M-274, 2.0 Who Must Complete Form I-9: An employer completes Form I-9 each time it hires a person to perform labor or services in the United States for wages or other remuneration; independent contractors are among those who do not need one.
• IRS, Independent contractor (self-employed) or employee?: Evidence of control and independence falls into behavioral, financial and type-of-relationship categories; Form SS-8 asks the IRS to determine a worker’s status and may take at least six months.
• U.S. Department of Labor, Misclassification of Employees as Independent Contractors: Employers are responsible for determining whether a worker is an employee under the FLSA; misclassification occurs when an employee is treated as an independent contractor, and the analysis guidance is at 29 CFR Part 795.
• IRS, Instructions for the Requester of Form W-9: Explains what a requester collects on Form W-9, backup withholding, and the TIN matching e-services available to payers.
• IRS, Instructions for Forms 1099-MISC and 1099-NEC: For tax years beginning after 2025, nonemployee compensation of $2,000 or more goes in box 1a of Form 1099-NEC, the threshold may be adjusted for inflation from 2027, and the corporate exemption does not apply to payments for legal services.
• IRS, Instructions for Forms 1099-MISC and 1099-NEC (Rev. 2025): For 2025, nonemployee compensation of at least $600 is reported on Form 1099-NEC, and rents and other income of at least $600 on Form 1099-MISC.
• IRS, About Form W-8BEN: A foreign person gives Form W-8BEN to the payer when requested, whether or not claiming a reduced rate of, or exemption from, withholding.
• IRS, About Form W-8BEN-E: Form W-8BEN-E is used by foreign entities to document their status for chapter 3 and chapter 4 purposes.
• California EDD, Independent Contractor Reporting: California businesses report an independent contractor to EDD within 20 calendar days of paying $600 or more, or entering a contract for $600 or more, in a calendar year, whichever is earlier.