Self-Employed Mortgage Qualifier

A salaried buyer's income is one number on a T4. A self-employed buyer's income depends on which of three methods the lender uses — and the gap between the lowest and highest can be six figures of buying power on the same tax return. This calculator runs your two-year average net income through all three methods side by side, so "how much can I afford" gets an honest range instead of a single guess.

What this calculator answers

Given two years of net self-employment income and any documentable add-backs, it shows the maximum home price under three qualifying-income methods: your income exactly as reported, CMHC's 15% gross-up for sole proprietors and partnerships, and an add-back of your specific documented deductions. Each feeds the same stress-test and GDS/TDS math a lender applies to any borrower.

What it deliberately does not cover

It does not model B-lender or stated-income (Business for Self) programs, which qualify you against your business's gross revenue rather than net taxable income — a genuinely different underwriting path with its own rules. It does not know which method your specific lender will actually use; that depends on the lender, the insurer, and your file. And like any affordability estimate, it ignores property tax, heat, and condo fees inside GDS, and any lender-specific overlays on top of the regulatory ceilings.

Every input, explained

Net self-employment income (two years). Line 23600 or your net business income from each of your last two tax returns' Notice of Assessment. The common error is entering revenue instead of net income — lenders start from what you were taxed on, not what came into the business.

Documentable add-backs. Capital cost allowance (CCA) and other eligible non-cash deductions your accountant can substantiate. This only matters if your lender uses the add-back method instead of the flat 15% gross-up — the calculator shows both so you're covered either way.

Other monthly debt payments. Every recurring payment: car loans, credit cards, lines of credit, student loans. These feed the TDS side exactly as they would for a salaried applicant.

Contract rate, amortization, and down payment. The same inputs any mortgage qualification uses — your expected rate, chosen amortization, and the cash you're putting down.

How the math works

The two years of net income are averaged. That average feeds three separate qualifying-income figures: as-reported (no adjustment), grossed up by 15%, and with your add-backs included. Each qualifying income then runs through the standard stress test (contract rate plus 2 points, or 5.25%, whichever is higher) and the 39% GDS / 44% TDS ceilings, exactly as any borrower's income would, to produce three maximum mortgage payments and three maximum home prices.

Worked example: $90,000 average net income

A self-employed consultant reports $95,000 in net income last year and $85,000 the year before, for a two-year average of $90,000. Their accountant identifies $8,000 in documentable CCA and other add-backs. They carry $500/month in other debt, expect a 4.65% contract rate, plan a 25-year amortization, and have $70,000 to put down.

Qualifying income as reported: $90,000 (the plain two-year average).
Qualifying income with the 15% gross-up: $90,000 × 1.15 = $103,500.
Qualifying income with add-backs: $90,000 + $8,000 = $98,000.
Maximum home price as reported: $482,406.
Maximum home price with the 15% gross-up: $555,314.
Maximum home price with add-backs: $525,611.

The gap between the lowest and highest figure here is over $72,000 of buying power, on the exact same income — entirely determined by which method the lender applies. That's the real reason to ask the question before you shop, not after a pre-approval surprises you. (The calculator's headline number always shows the highest of the three — in this example, the 15% gross-up method — and will switch to the add-backs method automatically if your add-backs are large enough to overtake it.)

Provincial quirks and edge cases

The 15% gross-up and add-back methods come from CMHC's self-employed mortgage loan insurance program and apply nationally, not by province — but the lenders willing to use them, and the documentation they'll accept, vary. Incorporated self-employed applicants are generally assessed differently again, often on salary or dividends actually paid out of the corporation rather than the corporation's net income directly; if you pay yourself through a corporation, ask your broker which figure they'll actually use before assuming these three methods apply to you unchanged.

Questions to ask a professional

Mortgage broker: Which of these three methods will my specific lender use, and is a different program (B-lender or stated income) a better fit for my file?
Accountant: Which of my deductions actually qualify as documentable add-backs under a lender's definition, and can you produce the paperwork to support them?
Mortgage broker: If I'm incorporated, will I be qualified on my corporation's net income, or only on what I actually pay myself?
Accountant: Would adjusting how much income I report next year (within what's legitimate) meaningfully change my qualifying income two years from now?

Frequently asked questions

Why does self-employed income get treated differently from a salary?

Because a lender starts from the same number the CRA taxes you on — your net income after business write-offs. A salaried applicant's T4 shows gross pay; a self-employed applicant's net income can be well below what actually came into the business, since legitimate deductions lower both the tax bill and the reported income a lender sees first.

What's the difference between the 15% gross-up and add-backs?

They're two different ways CMHC allows a lender to adjust a sole proprietor or partnership's net income upward, and a lender generally uses one or the other, not both. The gross-up simply adds 15% to your averaged net income as a flat adjustment. Add-backs instead add back specific eligible non-cash deductions, like capital cost allowance, that lowered your reported income but weren't actual cash leaving the business.

Do I need exactly two years of self-employment history?

Most A-lenders want a two-year average and recommend at least 24 months operating the business or working in the same line of work. Being self-employed for less than that doesn't automatically disqualify you, but you'll likely need to show additional strengths — cash reserves, predictable contracts, or relevant prior experience — to offset the shorter history.

Will a bank use the same method as an insured (CMHC) mortgage?

Not necessarily. The 15% gross-up and add-back methods come from CMHC's self-employed mortgage loan insurance program, which applies to insured deals. An uninsured lender, or one using its own internal policy, may qualify you on your net income as reported with no adjustment at all — which is why this calculator shows all three numbers rather than picking one.

Is this the same as a stated-income or "Business for Self" mortgage?

No. Stated-income and Business for Self (Alt. A) programs, offered by insurers like Sagen and Canada Guaranty, qualify you against a reasonableness test on your business's gross revenue rather than your net taxable income, usually require at least 10% down, and are a separate underwriting path from the gross-up and add-back methods this calculator models.

Rules and rates as of September 2026. This is general information for Canadian home buyers and sellers, not financial, legal, or tax advice. Rules and rates change; confirm current figures with your lawyer or notary, your lender, or the government office that administers the tax before relying on them.