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2025 Tax Preparation Guide for Canadian Sole Proprietors and Small Business Owners

As a Canadian sole proprietor or small business owner, preparing properly for your 2025 tax filing can save you time, stress, and money. Business taxes are more complex than personal returns, but with the right records and awareness of deadlines, the process becomes much more manageable.

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This guide outlines what you need to prepare, track, and review before submitting your 2025 taxes.

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(Please note this article is generated by AI for the general use of the clients of JG Bookkeeping and should not be relied on for legal purposes. As we do at JG Bookkeeping, always consult a Certified Professional Accountant prior to the filing of business taxes). 

1. Understand Which Return You Need to File

Your business structure determines how you file:

Sole Proprietors

  • File your business income as part of your personal tax return (T1)

  • Complete Form T2125 – Statement of Business or Professional Activities

  • Business income is taxed at your personal marginal tax rate

Corporations

  • File a T2 Corporate Income Tax Return

  • Separate from your personal tax return

  • Additional compliance and deadlines apply

This article focuses primarily on sole proprietors and unincorporated small businesses, but many principles apply broadly.

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2. Key 2025 Tax Deadlines (Important)

  • April 30, 2026 – Personal tax filing deadline

  • June 15, 2026 – Filing deadline for self-employed individuals

  • April 30, 2026 – Payment deadline (even if you file June 15)

Even if you qualify for the June filing deadline, interest starts accruing after April 30 if taxes are unpaid.

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3. Income Records You Must Have

You are required to report all business income earned in 2025, whether paid in cash, e-transfer, cheque, or online platforms.

Prepare:

  • Sales invoices issued in 2025

  • Payment receipts and summaries

  • Platform statements (e.g., Etsy, Shopify, PayPal, Square)

  • Cash sales logs (if applicable)

  • Foreign income records (converted to CAD)

Income must be reported using the accrual or cash method, consistently year to year.

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4. Expense Documentation to Gather

Only expenses incurred to earn business income are deductible. Keep receipts, invoices, or digital records for every claim.

Common deductible expenses include:

  • Advertising and marketing

  • Office supplies

  • Professional fees (bookkeeping, accounting, legal)

  • Business insurance

  • Vehicle expenses (business portion only)

  • Home office expenses

  • Internet and phone (business portion)

  • Software subscriptions

  • Meals and entertainment (50% deductible in most cases)

CRA requires records to be kept for at least six years.

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5. Home Office Expenses (If You Work From Home)

If you use part of your home regularly for business, you may claim a portion of:

  • Rent or mortgage interest

  • Utilities

  • Property taxes

  • Home insurance

  • Maintenance and repairs

You will need:

  • Total home square footage

  • Business-use square footage

  • Percentage calculation

Home office claims must be reasonable and well-documented.

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6. Vehicle and Mileage Records

If you use a vehicle for business, you must maintain:

  • A mileage log showing business vs personal use

  • Total kilometres driven in 2025

  • Receipts for fuel, insurance, repairs, lease payments, or depreciation (CCA)

Without a mileage log, vehicle expense claims are vulnerable during a CRA review.

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7. GST/HST Considerations

If you are registered for GST/HST:

  • Ensure all collected tax is recorded

  • Reconcile your GST/HST accounts

  • Confirm filing period (monthly, quarterly, or annually)

  • Prepare your GST/HST return before or alongside income tax

If you are not registered but exceeded $30,000 in gross revenue over four consecutive quarters, registration may be mandatory.

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8. Capital Assets and Depreciation (CCA)

Capital purchases such as:

  • Computers

  • Equipment

  • Furniture

  • Vehicles

are not expensed fully in one year. Instead, they are depreciated using Capital Cost Allowance (CCA).

Prepare:

  • Purchase dates

  • Costs

  • Asset categories

  • Prior-year CCA schedules (if applicable)

Incorrect CCA claims are a common CRA adjustment.

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9. Installments and Prior Balances

Review:

  • Income tax installments paid in 2025

  • GST/HST installments

  • Any prior-year balances or reassessments

Ensure installment payments are credited correctly before filing.

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10. Bookkeeping Review Before Filing

Before submitting your return, your books should be:

  • Reconciled to bank and credit card statements

  • Free of personal expenses misclassified as business

  • Categorized correctly

  • Balanced and consistent

Clean books reduce errors, audit risk, and accounting fees.

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11. What to Give Your Accountant or Tax Preparer

If you work with a professional, prepare:

  • Profit and loss statement for 2025

  • Balance sheet (if available)

  • Bank and credit card statements

  • Receipts and asset lists

  • Mileage and home office calculations

  • GST/HST reports

  • Prior-year tax return

Being organized can significantly reduce preparation costs.

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12. Plan Ahead for Cash Flow

Many small business owners are caught off guard by tax bills. Consider:

  • Setting aside 25–35% of net income for taxes

  • Making voluntary installments

  • Reviewing profitability before year-end

Tax planning is most effective before December 31, not after.

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