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# The home office deduction

You run the business from a spare room, the garage, or a shop at the back of the property. A share of what it costs to keep that space is deductible — if you claim it the way the CRA actually allows.

Updated for the 2026 tax year · figures verified 2026-08-02 · by Blue Crane Works

## The percentage-of-home method

The deduction is a share of your real home costs, and the share is normally based on floor area, per [the CRA's business-use-of-home rules for Form T2125](https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/sole-proprietorships-partnerships/report-business-income-expenses/completing-form-t2125.html). Measure the dedicated business space, divide by your home's total finished area, and that percentage is what you apply to eligible costs.

Say your shop and office take up 12% of the house. You can deduct 12% of heat, hydro, water, home insurance, maintenance — and, if you own, 12% of the mortgage *interest* (never the principal). Renters use 12% of rent instead.

The line that keeps you safe: the space should be a genuine, identifiable work area — a real office, a real shop — used regularly and mainly for the business. A dedicated room is a strong claim. "I sometimes do invoices on the couch" is not.

## The loss rule people miss

Home workspace costs can't push your business into a loss, under [the CRA's business-use-of-home rules for Form T2125](https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/sole-proprietorships-partnerships/report-business-income-expenses/completing-form-t2125.html). If they're bigger than your income this year, the leftover carries forward — you claim it in a later year with income to cover it. So a slow year doesn't burn the deduction; it defers it.

## Where this lands on your bill

Home office is rarely the biggest deduction, but it's steady, recurring, and completely legitimate — the kind of thing that quietly lowers your net income every single year. Add your realistic home-office share to your other expenses in [the calculator for your province](https://tradestaxcalculator.ca/) to see the effect.

## Common questions

### How much of my home can I deduct?

You deduct the business-use percentage of your home costs, usually calculated by floor area. If a dedicated office or shop is 12% of your home's square footage, you can generally deduct 12% of eligible home costs — heat, hydro, home insurance, maintenance, and a portion of rent or mortgage interest (not the mortgage principal).

### What home costs qualify?

Heat, electricity, water, home insurance, cleaning and maintenance, and property tax — all at the business-use percentage. Renters can include rent. Homeowners can include mortgage interest (not principal) and, with care, a portion of property tax. The full mortgage payment is never deductible.

### Does the space have to be used only for business?

For a self-employed home workspace, the CRA generally wants it to be either your principal place of business, or a space used exclusively for the business and regularly to meet clients. A dedicated office or shop is the cleanest claim. A corner of the kitchen table is a much weaker one.

### Can a home office deduction create a loss?

No — home workspace expenses can't be used to create or increase a business loss. If they exceed your income for the year, the unused portion carries forward to a future year when you have income to apply it against. Nothing is wasted; it just waits.

**Run your own numbers** — every province and territory has its own 2026 contractor tax calculator: [British Columbia](https://tradestaxcalculator.ca/bc/) · [Alberta](https://tradestaxcalculator.ca/alberta/) · [Saskatchewan](https://tradestaxcalculator.ca/saskatchewan/) · [Manitoba](https://tradestaxcalculator.ca/manitoba/) · [Ontario](https://tradestaxcalculator.ca/ontario/) · [New Brunswick](https://tradestaxcalculator.ca/new-brunswick/) · [Nova Scotia](https://tradestaxcalculator.ca/nova-scotia/) · [Prince Edward Island](https://tradestaxcalculator.ca/pei/) · [Newfoundland & Labrador](https://tradestaxcalculator.ca/newfoundland/) · [Yukon](https://tradestaxcalculator.ca/yukon/) · [Northwest Territories](https://tradestaxcalculator.ca/nwt/) · [Nunavut](https://tradestaxcalculator.ca/nunavut/).

**Keeping the paperwork straight** is half of getting deductions right. [Blue Crane](https://bluecraneworks.ca/) captures receipts as you buy and builds an accountant-ready export, and its [form maker](https://bluecraneworks.ca/tools.html) builds the printable Ontario contractor forms. For compliance forms and rules, see [Ontario Trade Registry](https://ontariotraderegistry.ca/).

Sources, verified 2026-08-02: [CRA — Completing Form T2125 (business-use-of-home)](https://www.canada.ca/en/revenue-agency/services/tax/businesses/topics/sole-proprietorships-partnerships/report-business-income-expenses/completing-form-t2125.html)

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Source: https://tradestaxcalculator.ca/deductions/home-office/