Contractor Expenses in Ontario: What's Deductible (and What Gets You in Trouble)

If you're a contractor in Ontario, deductions can save you real money—but only if they're clean, supported, and consistent. The fastest way to create CRA problems is claiming expenses that look personal, have weak receipts, or aren't tracked properly.

This post gives you a practical contractor expense checklist (and the red flags to avoid).

The contractor rule: deductible doesn't mean “anything I paid for”

For an expense to be deductible, it generally needs to be:

• for business purposes
• reasonable
• supported by receipts/invoices
• recorded consistently

If it's mixed personal/business, you need a method to split it.

Common contractor expenses that are usually deductible (with proper support)

Most Ontario contractors commonly deduct:

• Materials and supplies (job-related)
• Subcontractor costs (with invoices + proof of payment)
• Tools and small equipment
• Business insurance
• Advertising/marketing (website, flyers, Google ads)
• Accounting/legal fees
• Cell phone and internet (business-use portion)
• Vehicle expenses (business-use portion, with mileage log)
• Safety gear and uniforms (if required for work)

Expenses that need extra care (CRA questions happen here)

These aren't “automatically wrong,” but they need strong support:

• Meals (business purpose + detailed receipt + who/why)
• Home office (reasonable method + documentation)
• Vehicle (mileage log is critical)
• Large tools/equipment (may be capital assets; rules differ)
• Travel (must be clearly business-related)
• Gifts (business purpose and reasonableness)

If you can't explain it in one sentence, it's usually a risk.

The top CRA red flags for contractors

These patterns trigger questions fast:

• Lots of “miscellaneous” expenses
• High vehicle claims with no mileage log
• Meals claimed every week with no business purpose
• Home office claims that don't match your reality
• Personal shopping mixed into business cards
• Subcontractors paid with no invoices (and no T4A planning)
• Big expenses right before year-end with weak documentation

The contractor receipt system that actually works (simple)

If you want deductions to be clean, do this:

1. Use one business bank account + one business credit card
2. Save receipts weekly (photo or PDF)
3. Label anything unclear right away (job name, purpose)
4. Reconcile monthly (don't wait until tax time)

This is what keeps your books audit-safe.

Vehicle expenses (contractor version, simplified)

Vehicle claims are one of the most common CRA review areas.

Best practice:

• Track mileage (start/end, business purpose)
• Keep fuel/maintenance receipts
• Claim only the business-use portion

No mileage log = weak claim.

Subcontractors (don't ignore this)

If you pay subcontractors, keep:

• invoices
• proof of payment
• what job it was for

Also: subcontractor payments can create T4A considerations depending on the situation. Don't leave this until the last minute.

Quick contractor expense checklist (weekly)

Once a week, check:

• Are receipts saved for materials and tools?
• Are subcontractor invoices collected?
• Are vehicle receipts saved?
• Is anything personal mixed in (mark it)?
• Are expenses assigned to the right job?

15 minutes weekly prevents a 15-hour cleanup later.

FAQs