The T2125, explained: what self-employed Canadians actually file

What the T2125 is

The T2125, Statement of Business or Professional Activities, is the form self-employed individuals and partners in a partnership attach to their personal T1 return to report business income and expenses. It's not a separate filing with its own deadline — it's a schedule that feeds into your personal return, and the net result (income minus expenses) flows onto your T1 as taxable income. If you're a sole proprietor, a freelancer, a contractor, or run a professional practice without having incorporated, this is the form that does the reporting.

Incorporated businesses don't use it — a corporation files a T2 instead. But it's common to need both a T2125 and a T2125-style mindset even after incorporating, if an owner still does some unincorporated work on the side. The form itself is really just a structured version of what any business already needs to track: what came in, what went out, and what's left.

The sections, in plain English

The T2125 is longer than it needs to feel, because most of its sections either don't apply to a given business or are filled in once and barely change year to year.

• Identification: business name, industry code, fiscal year-end, and whether you're reporting on a cash or accrual basis.
• Income: gross sales or professional fees, less any returns or discounts, to arrive at net income before expenses.
• Expenses: a long, itemized list — advertising, insurance, office supplies, professional fees, rent, subcontractors, and more — each on its own line.
• Business-use-of-home expenses: a separate calculation for anyone claiming a home office (details below).
• Motor vehicle expenses: a separate calculation for business use of a personal vehicle (details below).
• Capital cost allowance (CCA): depreciation on equipment, vehicles, or other capital assets used in the business.

Nothing on this list is exotic. What makes the form painful is reconstructing the numbers after the fact — sorting a year of bank and credit card activity into these categories in March instead of having them categorized already.

The expense rules that actually change your number

A few categories have specific CRA rules that trip people up, and getting them wrong either leaves money on the table or creates a claim that won't survive a closer look.

Meals and entertainment

The maximum deductible amount for food, beverage, and entertainment expenses is 50% of whichever is lower: what you actually spent, or an amount reasonable in the circumstances (limited exceptions apply, such as costs billed back to a client, up to six staff social events a year, and certain remote-worksite meals). A full year of client lunches booked at 100% is a common — and easily caught — overstatement.

Home office

You can deduct a share of home costs — heat, home insurance, electricity, cleaning supplies, part of your property taxes, mortgage interest, and CCA — if your workspace is either your principal place of business, or is used only to earn business income and used regularly and on an ongoing basis to meet clients or customers. There's a ceiling worth knowing: the home-office deduction can't exceed your net business income before the deduction, so it can't create or increase a loss. Any amount you can't use this year carries forward to a future one.

Vehicle expenses

Only the business-use portion of vehicle costs is deductible, established by a log that separates business trips from personal ones. For reference, the CRA's 2026 per-kilometre automobile allowance rate is 73 cents/km for the first 5,000 km driven for business and 67 cents/km for each additional km (higher in the territories) — a useful benchmark even though self-employed filers claiming actual vehicle expenses are prorating real costs by a business-use percentage, not applying this rate directly.

Records

Whatever you claim, the paperwork behind it has to survive scrutiny for a while: tax records and supporting documents generally need to be kept for at least six years. That applies to every receipt, mileage log, and invoice sitting behind a T2125 line, not just the summary numbers.

Where the T2125 fits with your deadline

The T2125 doesn't have its own due date — it's due whenever your T1 is. For most self-employed filers (or anyone whose spouse or common-law partner is self-employed), that's June 15 to file, but any balance owing is still due April 30. Filing later doesn't move the interest clock: the CRA starts charging daily compound interest on an outstanding balance from May 1, whether or not the return itself is filed yet. The mechanics of that split deadline — and why it trips people up — are covered in our self-employed tax deadline guide.

Why clean books turn this into a printout

Everything the T2125 asks for — categorized income, categorized expenses, a defensible home-office and vehicle split — is exactly what monthly bookkeeping already produces. When the books are current, filling in the form is copying totals from a report. When they aren't, it's a weekend of receipt archaeology: reconstructing months you don't remember, guessing at business-use percentages, and hoping the meal receipts didn't get thrown out with the takeout containers.

That's the practical case for keeping books current all year rather than catching up every spring. Our monthly bookkeeping starts at $200/month, HST filings included, and keeps expenses categorized as they happen — so when T2125 season arrives, the work is already done. Falling behind isn't unusual either; if that's where you are, our catch-up bookkeeping guide covers how that gets fixed without starting over.