Home Office Deduction Calculator Canada

Estimate the current-year business-use portion of home expenses using office square footage, eligible costs, and the CRA loss-limit rule. Use it as a planning estimate for self-employed contractors.

This tool is for informational purposes only. It is not accounting, tax, or legal advice. Always verify CRA, Revenu Québec, and provincial rules before invoicing.

Self-employed deductions

Home office deduction estimator

Office sq ftTotal home sq ftMonthly rent ($)Annual mortgage interest ($)Annual property tax ($)Annual utilities ($)Annual internet ($)Annual home insurance ($)Net income before home office ($)Estimated marginal tax rate (%)

Detailed method basics

Self-employed Canadians can deduct a business-use percentage of home expenses only when the workspace is their principal place of business, or is used only to earn business income and regularly to meet clients, customers, or patients. The current-year deduction cannot create or increase a business loss; unused amounts may carry forward.

Pair with your invoicing

Tracking home office costs alongside client invoices helps you see true job profitability. Use the same records at tax time.

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