Vehicle Expense Tax Tips for Durham Region Small Businesses: 7 Records to Keep in 2026

A vehicle can be essential for a Durham Region business, whether you visit clients across Oshawa and Whitby, deliver products in Ajax and Pickering, or travel between job sites in Clarington. But paying for fuel with a business card does not automatically make every kilometre or every cost deductible.

Vehicle claims depend on how the vehicle is used, who owns it, and the records supporting the business portion. A reliable system is far easier to build during the year than to reconstruct at tax time. These seven records can help sole proprietors and incorporated business owners prepare a clearer, more supportable claim.

1. Maintain a contemporaneous kilometre log

Record business trips when they happen. Your log should show the date, destination, business purpose, and kilometres travelled. A calendar entry, mapping app, or vehicle-tracking app can support the details, but the final record should clearly separate business travel from personal driving.

Commuting from home to a regular place of business is generally personal travel. Trips from your business location to a customer, supplier, temporary job site, or bank may have a business purpose. Facts matter, especially when a home office or several work locations are involved, so do not assume every trip taken during working hours qualifies.

2. Record opening and closing odometer readings

Note the odometer at the start and end of the fiscal or calendar year, as applicable. Also record readings when you buy, sell, or trade the vehicle. These numbers establish total annual kilometres. Comparing business kilometres with total kilometres is central to calculating the business-use percentage for many vehicle expenses.

3. Keep detailed operating-cost receipts

Retain invoices and receipts for fuel, insurance, licence and registration fees, repairs, maintenance, parking, and other vehicle costs. A bank or credit card statement proves payment, but it may not identify what was purchased or show the tax charged. Scan thermal receipts before they fade and use consistent file names so a transaction can be traced from the books to its source document.

Parking paid specifically while earning business income and certain tolls may be treated differently from general operating costs. Post them to clear bookkeeping categories rather than combining every vehicle-related payment in one account.

4. Preserve purchase, lease, and financing documents

If you purchased the vehicle, keep the bill of sale, financing agreement, proof of payment, trade-in information, and documents showing taxes and fees. If you lease, retain the full lease agreement and monthly statements. The tax treatment of ownership, financing interest, and lease payments is not identical, and limits can apply to passenger vehicles.

Do not record a vehicle purchase as an ordinary one-time expense without review. A vehicle is usually a capital asset, and deductions may be claimed over time under the applicable rules.

5. Document who owns and uses the vehicle

Write down whether the vehicle is owned personally, owned by a corporation, or leased, and identify every regular driver. This affects how expenses, reimbursements, and possible taxable benefits are handled. An incorporated owner who uses a company vehicle personally can face different reporting issues than a sole proprietor using a personal vehicle for business.

Keep any written reimbursement policy, expense reports, and payments made to employees or shareholders. Avoid claiming the same cost twice through both company expenses and a personal reimbursement.

6. Separate HST from the income tax calculation

An HST-registered business may be able to claim input tax credits on eligible vehicle costs used in commercial activities. However, the available credit can depend on the business-use percentage, the type of vehicle, ownership, and other restrictions. The HST calculation should be supported and reconciled separately rather than copied automatically from the income tax deduction.

Keep invoices that meet CRA documentation requirements and make sure the tax code in your bookkeeping software matches the actual receipt. This reduces duplicate or unsupported HST claims.

7. Reconcile the claim before year-end

Before closing the books, compare the kilometre log with calendar appointments, customer invoices, service records, and expense receipts. Investigate gaps or unusually high business-use percentages while the details are still fresh. Confirm that the vehicle account contains only relevant costs and that personal amounts have been removed or allocated correctly.

Keep supporting tax records for the required retention period; in many cases, CRA requires records to be kept for at least six years from the end of the relevant tax year, although exceptions can apply.

Build a vehicle record system that lasts

The strongest vehicle expense claim is based on routine documentation, not an estimate made months later. Start with a kilometre log, preserve detailed receipts, record odometer readings, and review ownership and HST treatment before filing. The right calculation depends on your facts, so get advice when a vehicle is purchased, transferred to a corporation, used by an employee, or used heavily for both business and personal travel.

At Azim Tax & Accounting, we help Durham Region small businesses organize vehicle records, clean up bookkeeping, and prepare tax filings based on supportable business expenses.

Need help reviewing your business vehicle expenses? Read more small business tax tips or call (647) 570-0313 for a free consultation.