Subcontractors can help trades and home service businesses expand capacity and meet customer deadlines. But without a complete file, your office can end up struggling to confirm who was actually approved, what work they’re authorized to do, how they should be paid, and whether their documents are even current.
If you’ve followed along with this series, subcontractor costs have already come up more than once – in job costing, in change orders, and in comparing estimated to actual job profitability. Every one of those conversations assumed the subcontractor side of the job was already organized.
This post is where we go back and build that foundation properly, starting before the work ever begins.
Confirm the Worker Is Actually a Subcontractor, Not an Employee
Before any of the paperwork below matters, there’s a more basic question to answer.
Is this person genuinely an independent subcontractor, or are they functioning as an employee?
This isn’t a formality. The IRS and your state labor agency look at the actual working relationship, not just what you call it on paper. Misclassifying a worker can lead to back payroll taxes, penalties, and unpaid workers’ compensation premiums that land squarely on the business, not the worker.
Generally, a true subcontractor:
- Controls how the work gets done.
- Supplies their own tools and equipment.
- Can work for other companies at the same time.
- Sets or negotiates their own pricing.
- Carries their own insurance.
Someone who works exclusively for you, follows your schedule and supervision, uses your tools, and has worked this way for months or years starts to look much more like an employee in the eyes of a taxing authority, regardless of what the paperwork says.
If you’re unsure where a working relationship falls, this is worth a conversation with your bookkeeper, accountant, or employment attorney before you build out the file below, not after.
Getting this right at the start protects you from a much bigger problem down the road.
Everything that follows in this post – the W-9, the agreement, and the insurance documentation – only matters once you’ve confirmed the relationship itself is structured correctly.
A complete subcontractor file creates one reliable record before the work ever starts. At minimum, it should connect the subcontractor’s tax information, agreement, insurance records, licenses, approvals, payment details, and expiration dates.
Exact requirements vary by trade, location, contract terms, and insurance guidance, but most files should include the following.
1. A Completed W-9
The W-9 gives you what you need for an accurate vendor record and year-end reporting.
Review the:
- Legal name
- Business name (if different)
- Federal tax classification
- Address
- Taxpayer Identification Number (TIN)
- Signature
The name and tax information should clearly match the person or company actually submitting invoices and receiving payment.
Action standard:
Collect and review the W-9 before the first payment goes out.
2. A Signed Subcontractor Agreement
A written agreement defines the relationship before work begins.
It may cover:
- Scope of work
- Pricing and payment terms
- Deadlines
- Change orders
- Materials and equipment
- Insurance requirements
- Permits
- Jobsite expectations
- Documentation required before payment
The agreement should reflect how the relationship actually operates.
It doesn’t replace legal guidance, but it gives you a much clearer record than relying on verbal expectations.
Action standard:
Complete and sign the agreement before work begins.
3. Current Insurance and Workers’ Compensation Records
The file should contain whatever insurance and workers’ compensation documentation the relationship requires, such as:
- Certificate of Insurance (COI)
- Proof of workers’ compensation coverage
- Exemption
- Affidavit
- Waiver
Review the:
- Business name
- Coverage type
- Policy dates
- Coverage limits
- Insurance carrier
- Certificate holder information
Requirements vary by trade, location, contract, and insurer, so don’t rely on a verbal statement that someone is covered or exempt.
Confirm exactly which documents apply and keep current copies.
Action standard:
Verify required coverage and expiration dates before assigning work.
4. Required Licenses, Certifications, and Approvals
Some trades or projects require licenses, registrations, permits, or certifications.
When applicable, retain:
- Trade licenses
- State or local registrations
- Specialized certifications
- Permit-related documentation
- Customer-required credentials
The file should also clearly show:
- Approval date
- Who approved the subcontractor
- Services they’re authorized to perform
- Approved projects or locations
- Any restrictions or exceptions
No one on your team should ever need to guess whether a subcontractor is approved to perform the work.
Action standard:
Document who approved the subcontractor and exactly what work they’re authorized to do.
5. Contact, Payment, and QuickBooks Vendor Information
Once a subcontractor is qualified and approved, complete the contact, payment, and QuickBooks vendor information, and make sure the file and the vendor record agree.
Confirm:
- Legal name
- Business name
- Mailing address
- Phone number
- Billing contact
- Payment method
- Remittance information
- Tax information
- 1099 tracking status (when applicable)
- Payment terms
Avoid creating multiple vendor records for the same subcontractor.
Duplicate records split payment history and make year-end reporting harder than it needs to be.
Any changes to banking or electronic payment instructions should be independently verified before updating the vendor record or issuing payment.
Action standard:
Match the QuickBooks vendor record to the supporting tax, contact, approval, and payment documents.
6. Expiration Dates, Changes, and Exceptions
Some documents stay valid until information changes.
Others expire on their own.
Track:
- Expiration dates
- Updated documents requested
- Updated documents received
- Who is responsible for follow-up
- Whether work can continue while updates are pending
Also document important changes or exceptions, including:
- Name or address changes
- Updated payment instructions
- New insurance information
- Revised agreement terms
- Approved exceptions
- Work restrictions
Anyone reviewing the file should be able to see what changed and whether anything still needs action.
Action standard:
Track renewals before documents expire, and record every approved change or exception.
7. One Official Paper File
As a strong recordkeeping practice, maintain one official paper file for each subcontractor when you’re retaining original signed documents.
That file should include:
- Completed W-9
- Signed subcontractor agreement
- Insurance and workers’ compensation documentation
- Licenses and certifications
- Approval records
- Updated forms
- Notes about changes or exceptions
Digital copies can make day-to-day access more convenient, but they shouldn’t replace the official paper file when you’re keeping original signed documents.
Keep the paper file in a secure, defined location that allows authorized team members to quickly confirm records are complete and current.
Store anything containing tax IDs, banking information, or other sensitive data securely, with access limited to authorized employees.
Action standard:
Keep the official paper file complete, secure, and easy for authorized employees to review.
Review the File Before Work Begins
Before assigning work, confirm that:
- Required documents have been received.
- Names match across all records.
- Insurance or exemption documents are current.
- The agreement has been signed.
- Required licenses or certifications have been verified.
- The subcontractor has been approved.
- The QuickBooks vendor record is complete.
- Any exceptions or missing items are documented.
A clear standard makes this review faster, more consistent, and easier to delegate.
A Complete File Creates Clarity
A complete subcontractor file gives you one reliable record of:
- Who’s performing the work.
- What they’re approved to do.
- How they should be paid.
- Whether the required documents are current.
The goal was never paperwork for its own sake.
It’s to support operations, bookkeeping, year-end reporting, and risk management while cutting down the time you spend chasing information later.
When the file is complete before work begins, the owner, project manager, office, and bookkeeping team are all working from the same information.
This is the foundation.
Once a subcontractor file is built right, the next question is how to keep it that way every time you bring someone new on board. That’s exactly what we’ll walk through next.
If reading this made you realize your subcontractor files are incomplete, scattered, or you’re not sure where to even start, that isn’t something a checklist alone fixes.
Book a free discovery call, and let’s look at what you have in place and build a process that actually protects your business.
