How do lenders calculate self-employed income?

There is no single method. Most A lenders average Line 15000 of the T1 General across the last two Notices of Assessment, sometimes using the lower of the two years. Others add back expenses such as capital cost allowance, business-use-of-home and vehicle costs, or gross up net self-employment income. Alternative lenders may skip the tax return and assess six to twelve months of business bank deposits instead.

Does the lender matter more than the rate for a self-employed borrower?

Often yes. The method a lender uses to calculate self-employed income usually changes the qualifying amount far more than a fraction of a percent on the rate. A lender who reads the income generously can approve a file that a cheaper lender declines.

Answers › Self-Employed Mortgages

How do lenders calculate my self-employed income?

Q: What are add-backs on a self-employed mortgage application?

Add-backs are expenses that reduced taxable income without reducing available cash. Common examples are capital cost allowance, business-use-of-home, vehicle expenses and genuinely one-time costs. Lenders that allow add-backs restore a portion before calculating affordability, which can raise borrowing power on the same tax return.

Answered by Rajiv Verma, Mortgage Broker · Reviewed September 2026 · About a 4 minute read

The direct answer

There isn’t one method — there are four. A bank usually averages your last two years of declared income. Other lenders add back certain expenses, gross up your net income, or skip the tax return entirely and read your business bank deposits. The same return can produce very different borrowing power depending on who reads it.

THE SHORT VERSION

Two-year average — most banks average Line 15000 across two Notices of Assessment
Add-backs — expenses that lowered tax but not cash get partly restored
Gross-up — net self-employment income lifted to compare fairly against salaried pay
Bank statements — alternative lenders read deposits instead of the return
The calculation method usually moves the number more than the rate does

Method one: the two-year average

Most A lenders average Line 15000 of your T1 General across your last two Notices of Assessment.

Some use the lower of the two years rather than the average. That quietly costs you if last year was your stronger one — and it’s worth knowing which approach a lender takes before the application goes in, not after it comes back.

Method two: declared income plus add-backs

Certain expenses reduce your taxable income without reducing the cash in your pocket. Capital cost allowance, business-use-of-home, vehicle expenses and genuinely one-time costs are the usual candidates.

The right lender restores a portion of these before working out what you can carry. Which ones are accepted, and at what proportion, differs meaningfully between lenders — and that detail decides approvals.

Method three: gross-up on net income

Several lenders will gross up net self-employment income, on the reasoning that it is after-tax money being compared against a salaried borrower’s gross pay.

On the same tax return, that is a meaningful lift. Gross-up treatment varies by lender and programme.

Method four: bank statements and business-for-self programmes

Alternative lenders can work from six to twelve months of business deposits, your contracts and your corporate financial statements, rather than leaning on the Notice of Assessment at all.

If you are incorporated, retained earnings and a letter from your accountant carry real weight here.

Brokers talk about rate. On a self-employed file, the calculation method usually moves the number far more than a fraction of a percent does. A lender who reads your income generously at a slightly higher rate can approve a mortgage that a cheaper lender declines outright.

What tends to help the file

Two years of T1 Generals and Notices of Assessment
Accountant-prepared financial statements if you are incorporated
Six to twelve months of business bank statements
A clear note on any one-time expenses — they are easy to argue when documented, impossible when not
Taxes filed and CRA clear, or an arrangement in place

When this is the wrong thing to focus on

When credit is the real problem. No calculation method rescues a file that fails on credit. Deal with the blocking issue first.

When CRA arrears are outstanding. Most A lenders will not get far enough to read your income figure at all.

When the payment only works in a good year. Self-employed income moves. The payment needs to survive a slow quarter, not just a strong one.

What to do next

Send me your last two Notices of Assessment, and your corporate financials if you are incorporated. I’ll tell you what each category of lender would calculate from the same paperwork — before we apply anywhere.

Talk it through →

Related questions

Answered by Rajiv Verma, Mortgage Broker · Mortgage Architects — FSRA Brokerage Licence #12728 · Licensed in Ontario · Office 289.505.0631 · Direct 647.291.7116

General information about Ontario mortgages — not financial, legal or mortgage advice. Document requirements and lender guidelines vary. Every file is reviewed individually.