Free tool · Canadian self-employed
Home office deduction calculator
If your home is your principal place of business, or a space is used only for the business where you regularly meet clients, a share of your rent or mortgage interest, utilities, insurance, and upkeep is deductible on your T2125. Enter your workspace size and yearly costs to estimate what you can claim, with the CRA’s loss limit and carryforward built in. Your internet is claimed too, on its own line and at its own share.
1 · Your workspace
It counts if your home is your principal place of business, or the space is used only for the business and you regularly meet clients there.
2 · Your yearly home costs
Enter the full-home annual amounts. We apply your business-use share. Renters use rent; owners use mortgage interest and property tax (never mortgage principal). Internet is not a cost of the work space, so it gets its own step below.
3 · Internet
Internet is not prorated by floor area. The CRA treats it as an ordinary business expense on T2125 line 9220, claimed at the business-use share of the service: how much of your connection carries work, which is a different number from how much of your home is an office. It is not subject to the home-office loss limit either.
4 · Net business income (optional)
Your net self-employment income before this deduction, after your other business expenses (the internet share above among them). The home-office deduction can’t create or increase a loss, so we cap it at your income and carry the rest forward.
Fill in your space and costs
We need your workspace size, home size, and at least one yearly cost to estimate the deduction. An internet bill with the share of the service you use for work is enough on its own: it is claimed on its own line, not through the work space.
How the deduction is figured.
Your business-use share
Workspace area divided by your home’s total area. A room used only for business counts fully; a shared space (a dining table office) is reduced by the hours it is actually used for work.
Eligible work-space costs
Heat, electricity, water, home insurance, maintenance, and either rent or mortgage interest plus property taxes. Mortgage principal never counts, it is a capital repayment, not an expense. Internet is not a work-space cost at all, so it is claimed beside them, not inside them.
The loss limit
The deduction can’t create or increase a business loss. It is capped at your net income for the year, and anything you can’t use carries forward to a future year.
Uses the CRA detailed business-use-of-home method for the self-employed (Form T2125, line 9945). The temporary $2/day flat-rate method was for employees and ended after 2022. Internet is not part of that method: it is deducted as a regular business expense on line 9220 at the business-use share of the service. Always confirm with the CRA or your accountant. Nothing here is tax advice. Sources: canada.ca, business-use-of-home expenses and income tax folio S4-F2-C2, paragraphs 2.32 to 2.33.
Questions
- How is the home office deduction calculated for self-employed Canadians?
- First, the space has to qualify: your home is your principal place of business, or the space is used only for the business and you regularly meet clients there. Then take the area of your workspace divided by the total finished area of your home to get your business-use percentage. If the space is also used personally, you further reduce it by the share of hours it is used for business. Multiply that percentage by your eligible home costs for the year. This goes on Form T2125, line 9945.
- What home expenses can I include?
- Heat, electricity and water, home insurance, maintenance and repairs, and either rent (if you rent) or mortgage interest and property taxes (if you own). These are the costs of the work space itself, which is what the business-use percentage prorates. You cannot include mortgage principal, which is a capital repayment, not an expense, and internet is not on the list either: it is claimed on its own line, which the calculator does for you.
- Can I claim my internet as a home office expense?
- Not through the work-space calculation, and claiming it that way costs you money. CRA income tax folio S4-F2-C2, paragraph 2.32, says the cost of telephone and internet service may relate to the business but does not relate to the work space, so it falls outside the business-use-of-home rules entirely. Your internet is an ordinary business expense on Form T2125 line 9220, claimed at the business-use share of the service: how much of your connection carries work, not how much of your floor is an office. For most people that is the bigger of the two shares, and unlike the home-office claim it is not capped at your net income. This calculator works it out separately so you see both numbers.
- What is the difference between this and the $2/day method?
- The temporary $2/day flat-rate method was for employees working from home during 2020 to 2022 and is no longer available. Self-employed people use the detailed business-use-of-home method, which is what this calculator uses, and there is no $500 cap on it.
- Can the home office deduction create a loss?
- No. Business-use-of-home expenses cannot be used to create or increase a business loss. You can only deduct up to your net business income for the year; any unused amount carries forward and can be claimed in a future year, subject to the same limit.
- Are these results official?
- No. This is a representative estimate based on the CRA's detailed business-use-of-home method. Your situation may have nuances, so confirm with the CRA or your accountant. Nothing here is tax advice.
It is one of many deductions
Your home office, and everything else you can write off.
Claimable tracks your home-office claim with the loss limit and carryforward handled for you, and sits it next to your scanned receipts, vehicle log, and CCA, each on its CRA line on your T2125 for a clean hand-off at tax time.
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