Small Business Tax Write-Offs in Canada: The 2026 Checklist

Every business owner has heard someone at a barbecue say "just write it off." Most of the time, the person saying it could not explain what a write-off actually does. So before the checklist, a quick reality check, because understanding the mechanics is what separates owners who save real money from owners who get reassessed.

How do tax write-offs actually work?

A deduction reduces your taxable income, not your tax bill. If your business earns $100,000 and you deduct $10,000 of legitimate expenses, you pay tax on $90,000. The saving is the deduction multiplied by your tax rate.

For an incorporated Canadian small business, the combined federal and Ontario small business rate is 11.2% as of July 1, 2026 (9% federal plus Ontario's newly cut 2.2%). So a $1,000 deduction saves about $112. For a sole proprietor, business income is taxed at your personal marginal rate, which climbs much higher, so the same $1,000 deduction can save several hundred dollars. That difference is one reason the incorporation decision changes your whole tax picture.

Two rules govern everything below. The expense must be incurred to earn business income, and it must be reasonable. A $40 client lunch is reasonable. A $4,000 one is a conversation with an auditor.

What can a small business write off in Canada?

Here is the 2026 checklist. Nearly every line depends on the expense actually being recorded in your books, which we will come back to.

A few of these deserve a closer look, because they are the ones the CRA reviews most often.

How does the home office deduction work?

You can deduct home workspace costs if the space is your principal place of business, or you use it regularly and exclusively to meet clients, patients, or customers.

The math is proportional. If your office is 150 square feet of a 1,500 square foot home, you deduct 10% of eligible home costs: utilities, internet, rent if you lease, and for homeowners a share of property taxes and home insurance. Run the percentage honestly. Claiming 40% of your home as "office" is a classic review trigger.

One more nuance: home office expenses cannot create or increase a business loss. Unused amounts carry forward to future years, so track them even in a slow year.

Ignore the $2 a day flat rate you will still find in 2026 blog posts. That was a temporary pandemic method for employees only, capped at $400 for 2020 and $500 for 2021 and 2022, and the CRA eliminated it from the 2023 tax year onward. Self-employed people were never eligible for it and have always used the proportional calculation above, which has no dollar cap.

How do you write off vehicle expenses?

You deduct the business-use percentage of your vehicle costs, and the CRA expects you to prove that percentage with a kilometre logbook: date, destination, purpose, and distance for business trips, plus total kilometres for the year.

Drive 20,000 km in a year, 8,000 of them for business, and 40% of your fuel, insurance, repairs, and licensing becomes deductible. Depreciation on the vehicle itself is claimed separately through capital cost allowance, which spreads the cost over several years rather than deducting the purchase all at once.

No logbook means no defensible number, and "I drive a lot for work" has never once impressed an auditor. A logbook app on your phone solves this permanently.

One correction worth making early: the 73 cents a kilometre rate is not your deduction. For 2026 the CRA allows an employer to reimburse an employee tax free at up to 73 cents per kilometre for the first 5,000 business kilometres and 67 cents after that, in the provinces. That is a limit on an allowance paid to someone else, not a rate a self-employed person can multiply by their kilometres. A sole proprietor deducts the business-use share of what the vehicle actually cost, as above. If you are incorporated and drive your own car on company business, the corporation can pay you that per-kilometre allowance tax free instead of claiming the car itself, which is often the simpler and better answer.

How much of a vehicle can you actually deduct in 2026?

Less than the sticker price, if it is a car. The CRA caps what a passenger vehicle can be worth for tax purposes, and for vehicles bought on or after January 1, 2026 that ceiling is $39,000 before tax, up from $38,000 in 2025. Everything above the ceiling is simply never deducted.

The ceiling is set before sales tax, and the tax is then calculated on the capped figure rather than on what you paid. In Ontario that makes the maximum capital cost of a 2026 passenger vehicle $44,070: $39,000 plus 13% HST on $39,000.

Here is what that costs in practice. Buy a $60,000 SUV in Toronto and you write a cheque for $67,800 with HST. The most that can ever go onto your capital cost allowance schedule is $44,070, so $23,730 of the purchase price is never deducted at all, in any year, at any business-use percentage. Owners who budget a vehicle purchase as a tax shelter usually discover this on the far side of the decision.

The ceiling is the one your vehicle's purchase year sets, and it does not move afterward: $37,000 for 2024, $38,000 for 2025, $39,000 for 2026. Which class the vehicle lands in follows from the same number. A passenger vehicle costing more than the ceiling goes into Class 10.1, and each one is tracked in its own separate class rather than pooled. One costing the ceiling or less goes into Class 10 with everything else. Both depreciate at 30%.

Leases and loans get capped the same way, and the lease rule is the one most often stated too simply. The deduction is the lower of two limits, not a flat $1,100. The first is the $1,100 a month plus tax, prorated by the days you held the lease, which works out to roughly $15,123 for a full year in Ontario. The second scales your claim down once the manufacturer's suggested list price runs high, and in Ontario for 2026 it only starts to bite above a list price of $44,070. Below that, the monthly limit is the only one that binds. Chart C on form T2125 does the arithmetic. Interest is simpler: the cap is $350 divided by 30, times the days in your fiscal period, or $4,258 for a full year.

Which vehicles escape the passenger vehicle cap?

Plenty of them, and this is where a trades or delivery business gets a materially better answer than a consultant does. The caps apply only to a passenger vehicle, which the CRA defines as a vehicle designed primarily to carry people, seating a driver and no more than eight passengers. A vehicle that fails that test is a plain motor vehicle, goes into Class 10 at its full cost, and faces no ceiling on capital cost, lease payments, or interest.

Seating and use in the year you bought or leased it decide which one you have:

Note how far apart those two thresholds sit. A two-seat work truck qualifies at more than 50% business use, while the moment you add a back seat the bar jumps to 90% or more. A crew-cab pickup that does 80% business kilometres is a capped passenger vehicle; the same truck in a regular cab is not. That is a purchasing decision, not a filing decision, and it is worth making before you sign.

A handful of vehicles are excluded outright regardless of seating: ambulances and clearly marked emergency medical, police, and fire response vehicles, a vehicle bought to be used more than 50% as a taxi or a passenger bus, a hearse or funeral-business passenger vehicle, vehicles bought to sell, rent, or lease in a vehicle sales or rental business, and a pickup used more than 50% to carry goods, equipment, or people to a remote or special work site at least 30 kilometres from the nearest community of 40,000 people.

Can you pay family members and deduct it?

Yes, and for many family-run businesses it is one of the most useful deductions on the list. Salaries paid to a spouse or child are deductible under the same two conditions as any expense: the work is real, and the pay is reasonable for what was actually done.

Reasonable means what you would pay a stranger for the same job. If your teenager manages your social media and files invoices five hours a week, pay the going rate for that work, run it through payroll properly, and keep a simple record of what they did. Done right, income shifts from your higher tax rate to their lower one, and the business deducts every dollar.

Done wrong, it unravels fast. A $50,000 "office manager" salary to a spouse who never touches the business is the kind of deduction the CRA denies while leaving the recipient taxed on the income anyway, the worst of both worlds. Keep timesheets or task records, pay by traceable transfer rather than cash, and issue the proper slips.

What about the timing of big purchases?

Not every business cost is deducted in the year you spend it. Equipment, computers, vehicles, and furniture are capital assets: instead of writing off the full price at once, you deduct a portion each year through capital cost allowance (CCA). The classes and rates vary by asset type, which is precisely the kind of detail worth handing to your accountant rather than guessing.

Two practical takeaways. First, a December equipment purchase can still generate a partial-year claim, so year-end timing conversations are worth having before December 31, not after. Second, CCA is optional in any given year; skipping it in a loss year and saving it for a profitable one is a legitimate planning move that owners doing their own returns almost always miss.

Can you write off equipment in full the year you buy it?

Usually no. A laptop, a work vehicle, or office furniture bought in 2026 goes onto the CCA schedule and is deducted over several years, not expensed in one. The full first-year write-off that 2026 deduction checklists still promote, up to $1.5 million of immediate expensing, was a temporary measure and it has expired.

This is worth being precise about, because it is the most common wrong number circulating in Canadian small-business tax content right now. What the rules actually say:

Read the bottom two rows carefully before getting excited. They are narrow, they target manufacturers and clean-energy investment rather than a consulting firm buying laptops, and they are proposed measures still working through legislation rather than settled law. If your business genuinely buys manufacturing equipment or a plant, they matter a great deal and deserve a planning conversation this year. For most Toronto small businesses, the honest 2026 answer is the boring one: capital assets go on the CCA schedule, and the planning lever is timing, not a full write-off.

What can you not deduct?

The list of famous non-deductions, each one requested weekly by hopeful owners everywhere:

• Regular clothing. Suits, dresses, and anything you could wear outside work are personal, even if you only bought them for client meetings. Actual uniforms and safety gear are different.
• Commuting. Driving from home to your regular place of work is personal travel. Travel between work locations or to client sites is business.
• Personal meals. Lunch at your desk is not a business meal. The 50% rule applies to meals with a genuine business purpose, not to feeding yourself.
• Life insurance premiums. Usually not deductible, with narrow exceptions such as policies assigned as collateral for certain business loans.
• Golf and club memberships. Explicitly blocked by the Income Tax Act, no matter how much business happens on the back nine.
• Fines and penalties. Parking tickets and CRA penalties stay on your side of the ledger.

What records does the CRA expect you to keep?

Keep your receipts, invoices, bank statements, logbooks, and payroll records for six years from the end of the last tax year they relate to. Digital copies are fine, so the modern answer is simple: snap or forward every receipt into your accounting system the day you get it.

Records are also the difference between a question and a problem. Overclaimed vehicle, meal and home-office expenses are among the most common CRA audit triggers, and what settles them is documentation rather than argument.

The burden of proof runs in one direction. If the CRA questions a deduction and you cannot produce the record, the deduction is usually denied, and the reassessment comes with interest. A credit card statement alone often is not enough; the CRA wants the actual receipt showing what was purchased.

Why do most businesses miss deductions?

Not because the rules are secret. Because the expenses never make it into the books. The subscription billed to a personal card. The cash parking fee at a client site. The home internet nobody prorated. Six untracked expenses a month at $50 each is $3,600 a year of vanished deductions.

This is the unglamorous truth of tax season: deductions are captured in the bookkeeping, not the tax return. By the time your accountant prepares the T2 in the spring, they can only work with what was recorded. Clean monthly bookkeeping also keeps your HST input tax credits flowing, since every missed receipt loses you the 13% twice: once as a deduction, once as a credit. And if your books are months or even years behind, those deductions are usually not gone yet: our guide to catch-up bookkeeping covers what a cleanup costs and how far back to rebuild.

If you suspect your books are leaking deductions, a free assessment takes about five minutes and will show you where.