Hiring Subcontractors in Canada: T4A Slips, Tax Rules, and CRA Compliance

As your business grows, you will likely hire subcontractors to handle overflow work, specialized tasks, or project-based needs. The tax implications are different from hiring employees, and the CRA has specific rules about reporting payments and classifying workers correctly.

Get it right and you save on payroll costs and compliance overhead. Get it wrong and you face penalties, back taxes, and interest. This guide covers the key rules every Canadian small business owner needs to know when working with subcontractors.

Contractor vs. Employee: Why the Distinction Matters

The CRA draws a clear line between an employee and an independent contractor. The classification determines:

• Whether you need to deduct CPP, EI, and income tax from payments
• Whether you issue a T4 slip (employee) or T4A slip (contractor)
• Whether the worker charges you GST/HST
• Your liability if the CRA reclassifies the relationship

How the CRA Determines the Relationship

The CRA looks at several factors to determine whether a worker is an employee or a contractor. No single factor is decisive; the CRA considers the overall picture.

Factor	Employee	Contractor
Control	You direct how, when, and where the work is done	The worker controls their own methods and schedule
Tools and equipment	You provide the tools and workspace	The worker provides their own tools
Financial risk	You bear the financial risk of the work	The worker can profit or lose money on the engagement
Subcontracting	Cannot hire a replacement to do their work	Can subcontract or hire helpers
Integration	Work is integral to your business operations	Worker provides services to multiple clients
Exclusivity	Works primarily for you	Free to work for other clients simultaneously

The Intent of the Parties

The CRA also considers the intention of both parties. If you and the worker both agree the relationship is a contractor arrangement and the working conditions reflect that, it supports the classification. A written contract clearly stating the relationship is a contractor engagement is important, but it is not sufficient on its own. The actual working conditions must match.

When to Issue a T4A Slip

If you pay a subcontractor $500 or more in a calendar year for services, you are required to issue a T4A slip. The $500 threshold applies to the total payments to that individual or business during the year, not per payment.

Key Details for T4A Filing

• Box 048 is the standard box for fees for services paid to subcontractors
• Report the gross amount paid before any deductions
• Do not include GST/HST in the amount on the T4A. Report only the fees, not the tax.
• File the T4A with the CRA and provide a copy to the contractor by the last day of February following the calendar year

What If You Pay Less Than $500?

If total payments to a subcontractor are under $500 for the year, you are not required to issue a T4A. However, you should still keep records of the payments as business expenses. The contractor is still required to report the income regardless of whether they receive a T4A.

T4A for Corporations

If your subcontractor operates through an incorporated business, you are generally not required to issue a T4A slip for payments made to the corporation. The T4A requirement applies primarily to payments made to individuals, partnerships, and unincorporated businesses.

However, some payments to corporations do require a T4A (such as certain professional fees). When in doubt, it is safer to issue one.

Withholding Requirements

One of the significant advantages of hiring contractors over employees is that you generally do not need to withhold income tax, CPP contributions, or EI premiums from payments to independent contractors.

The contractor is responsible for:

• Reporting the income on their own tax return
• Paying their own income tax (potentially through instalments)
• Making their own CPP contributions through their T1 return
• Collecting and remitting their own GST/HST if registered

Exceptions: When You Must Withhold

There are situations where you may be required to withhold from contractor payments:

• Non-resident contractors: If the contractor is not a Canadian resident, you may need to withhold 15% under Regulation 105 and remit it to the CRA
• CRA requirement to deduct: In rare cases, the CRA may issue a requirement directing you to withhold from payments to a specific contractor who has outstanding tax debts

GST/HST Implications

If the Contractor Charges GST/HST

If your subcontractor is a GST/HST registrant (they have exceeded $30,000 in revenue or voluntarily registered), they will charge you GST/HST on their invoices. You can claim this amount as an input tax credit (ITC) on your own GST/HST return, reducing your net tax.

Make sure contractor invoices include their GST/HST registration number. You need this to support your ITC claim.

If the Contractor Does Not Charge GST/HST

If the contractor is a small supplier (under $30,000 in annual revenue) and not registered for GST/HST, they will not charge tax on their invoices. You simply pay the invoiced amount with no GST/HST component, and there is no ITC to claim.

Your Own GST/HST on Services Provided

If you are a GST/HST registrant and you charge your clients for the work your subcontractor performs, you collect GST/HST from your clients on the full amount, including the portion that covers the subcontractor's fees. The ITC you claim on the subcontractor's invoice offsets this.

CRA Penalties for Misclassifying Workers

Misclassifying an employee as a contractor is one of the most expensive mistakes a small business can make. If the CRA determines that a worker you treated as a contractor should have been classified as an employee, the consequences include:

What You Owe

• Unpaid CPP contributions: Both the employer and employee share, plus interest
• Unpaid EI premiums: Both the employer and employee share, plus interest
• Penalties: Typically 10% of the CPP and EI amounts that should have been remitted, increasing to 20% for repeat violations
• Interest: Calculated from the date the amounts should have been remitted

How Far Back the CRA Can Go

The CRA can reassess for up to four years from the date of the original assessment. In cases of misrepresentation or fraud, there is no time limit.

How to Protect Yourself

1. Use a written contract that clearly defines the relationship as an independent contractor arrangement
2. Ensure the working conditions match the contract (do not control how and when the work is done)
3. Allow the contractor to work for other clients
4. Have the contractor provide their own tools and equipment where practical
5. Pay by project or milestone, not by the hour (hourly pay can indicate employment)
6. Request a GST/HST number if the contractor claims to be registered

CRA Ruling Request

If you are unsure whether a worker should be classified as an employee or contractor, you can request a CPP/EI ruling from the CRA using Form CPT1 (Request for a Ruling as to the Status of a Worker Under the CPP and/or the EIA). The CRA will review the facts and issue a determination. While this takes time, it provides certainty and protects you from retroactive penalties.

Record-Keeping Requirements

For each subcontractor, maintain:

• The signed contract or statement of work
• All invoices received from the contractor
• Proof of payment (bank records, cancelled cheques, e-transfer confirmations)
• The contractor's business name, address, and social insurance number (or business number)
• A copy of the T4A slip issued

Keep these records for at least six years from the end of the tax year they relate to, as required by the CRA.

Key Takeaways

• The contractor vs. employee distinction depends on control, tools, financial risk, and the ability to subcontract
• Issue a T4A slip when you pay a subcontractor $500 or more in a calendar year
• Report fees in Box 048 and exclude GST/HST from the amount
• You generally do not withhold income tax, CPP, or EI from contractor payments
• Claim ITCs on GST/HST charged by registered subcontractors
• Misclassification penalties are steep: back CPP, EI, interest, and 10-20% penalties
• Request a CRA ruling if the classification is unclear

Sources

1. CRA Guide RC4110 — Employee or Self-Employed?
2. CRA — T4A slip: Information for payers
3. CRA — Employee or self-employed?
4. CRA — Request a CPP/EI ruling
5. CRA — Non-resident withholding (Regulation 105)