Small Business Tax Canada: Complete 2025 Guide

Understand corporate tax rates, deductions, filing deadlines, and legal strategies to minimize your Canadian small business tax bill.

Corporate Tax Rates for Small Business (2025)

Province	Federal Rate	Provincial Rate (SBD)	Combined Rate (first $500K)
Ontario	9%	3.2%	12.2%
British Columbia	9%	2%	11%
Alberta	9%	2%	11%
Quebec	9%	3.2%	12.2%
Manitoba	9%	0%	9%
Saskatchewan	9%	1%	10%

The small business deduction applies to the first $500,000 of active business income for Canadian-controlled private corporations (CCPCs). Above $500K, the general corporate rate applies (15% federal + provincial rate, typically 26–31% combined).

Key Tax Deductions for Canadian Small Businesses

• Salaries and wages: Fully deductible including employer CPP and EI contributions
• Home office expenses: Proportional amount if you work from home (% of rent/mortgage interest, utilities, insurance)
• Vehicle expenses: Business-use portion of fuel, insurance, maintenance, lease payments, or CCA on owned vehicle
• Business meals and entertainment: 50% deductible when business purpose is documented
• Professional fees: Legal, accounting, bookkeeping — 100% deductible
• Capital Cost Allowance (CCA): Depreciation on business assets (computers, equipment, furniture) by CCA class
• Interest expense: Interest on business loans is fully deductible
• Marketing and advertising: Fully deductible
• Travel expenses: Business-related flights, hotels, taxis — fully deductible with receipts

T2 Corporate Tax Return: Filing and Payment

All Canadian corporations must file a T2 corporate income tax return every year, even if no tax is owing. The T2 is due 6 months after your fiscal year end. However, tax owing is due 2 months after fiscal year end (3 months for CCPCs that paid small business rate tax). To avoid interest charges, ensure you pay estimated taxes on time.

Corporate tax installments are required if your net tax payable for the current or prior year exceeds $3,000. Installments are paid monthly (or quarterly for eligible small CCPCs). Missing installment deadlines results in interest charges at the prescribed rate plus 4%.

Choosing Your Fiscal Year End

Unlike individuals (who must use December 31), corporations can choose any fiscal year end. Strategic choices include:

• January 31 — gives maximum time to prepare T4s before personal filing season
• March 31 — aligns with government fiscal years (useful for government contractors)
• September 30 or October 31 — avoids the busy December/January bookkeeping season

Once chosen, changing your fiscal year requires CRA approval. Choose thoughtfully at incorporation.

Passive Income and the Small Business Deduction

An important 2018 rule change: if your CCPC earns more than $50,000 in passive investment income (interest, dividends, capital gains from investments held in the corporation) in the prior year, the $500,000 small business deduction limit begins to phase out. At $150,000 of passive income, the limit is reduced to zero. This affects corporations that retain and invest profits — consult your accountant on structuring investment income to protect your small business deduction.