CMHC's 15% Self-Employed Figure Still Stands, With a Business Structure Condition
When a lender adds 15% to a self-employed borrower's reported income under CMHC's insured program, it is acknowledging that the tax return understates what the business actually supports. Owners who work for themselves deduct legitimate expenses, and those deductions shrink the line that a lender reads. The gross-up is CMHC's way of bringing some of that income back into the qualifying calculation. As of September 2026, CMHC still lists the figure at 15%. What matters is who it applies to: the gross-up is for sole proprietorships and partnerships.
That condition is easy to miss when the number travels on its own. A 15% figure passed between borrowers, agents and online calculators usually loses its qualifier along the way, and the result is a borrower who expects a bump in qualifying income that their business structure may not produce.
How the gross-up works in practice
The mechanism is simple arithmetic applied to a carefully chosen base. CMHC looks at self-employed income averaged over 24 consecutive months, which smooths out a strong year or a weak one. The lender may then add 15% to that averaged figure.
As an illustration only, take a sole proprietor whose net business income averages $80,000 across two years. If the lender applies a 15% gross-up, qualifying income comes to $92,000. That difference flows through every debt service ratio the lender calculates, so it can affect the purchase price a borrower qualifies for or the amount available on a refinance.
The two-year window matters as much as the percentage. Borrowers with less than two years of self-employment history generally fall outside prime lending, and the gross-up does not change that. It improves the qualifying picture for someone with an established track record. It does not create a track record where none exists.
Why business structure decides the outcome
A sole proprietor or partner reports business income on their personal return. The lender sees the net figure after expenses, and that is precisely the number the gross-up was designed to adjust.
An incorporated owner is in a different position. Income moves from the corporation to the owner in a way the owner largely controls, and the documents a lender reviews reflect that. Because CMHC ties the 15% gross-up to sole proprietorships and partnerships, an incorporated borrower should not assume it will be applied to their file. Their qualifying income is assessed through a different lens, and the strategy for presenting it is different too.
This is where many qualification surprises start. A business owner runs the numbers with a gross-up in mind, settles on a price range, and then learns the calculation does not apply to their structure.
What to do before you apply
If you are self-employed in Ontario and planning a purchase or refinance with less than 20% down, CMHC insurance is in play, since insurance is required above 80% loan-to-value. A few steps make the conversation with a lender much clearer:
Confirm your structure on paper. Know whether you file as a sole proprietor, a partner or a corporation, and have the documents that show it.
Gather two full years of returns and assessments. The 24-month average is built from these, so gaps or late filings slow everything down.
Look at both years, not just the latest. A strong recent year is averaged against the one before it.
Ask how your income will be calculated before you shop. Getting the qualifying figure first keeps your price range realistic.
For investors, rental income is a separate piece of the file. Lenders generally credit between 50% and 80% of gross rental income toward debt service, and that range interacts with self-employed income in ways worth modelling before you commit to a property.
For agents working with self-employed buyers
If your buyer is self-employed, the question of business structure belongs early, ideally before an offer goes in. A buyer who expects the 15% gross-up but is incorporated may qualify for less than they believe, and that gap tends to appear during the financing condition, when time is short. Encouraging a pre-approval that reflects how their income will actually be read protects the deal and gives everyone a firmer sense of what the buyer can carry.
When a lender adds 15% to a self-employed borrower's reported income under CMHC's insured program, it is acknowledging that the tax return understates what the business actually supports. Owners who work for themselves deduct legitimate expenses, and those deductions shrink the line that a lender reads. The gross-up is CMHC's way of bringing some of that income back into the qualifying calculation. As of September 2026, CMHC still lists the figure at 15%. What matters is who it applies to: the gross-up is for sole proprietorships and partnerships.
That condition is easy to miss when the number travels on its own. A 15% figure passed between borrowers, agents and online calculators usually loses its qualifier along the way, and the result is a borrower who expects a bump in qualifying income that their business structure may not produce.
How the gross-up works in practice
The mechanism is simple arithmetic applied to a carefully chosen base. CMHC looks at self-employed income averaged over 24 consecutive months, which smooths out a strong year or a weak one. The lender may then add 15% to that averaged figure.
As an illustration only, take a sole proprietor whose net business income averages $80,000 across two years. If the lender applies a 15% gross-up, qualifying income comes to $92,000. That difference flows through every debt service ratio the lender calculates, so it can affect the purchase price a borrower qualifies for or the amount available on a refinance.
The two-year window matters as much as the percentage. Borrowers with less than two years of self-employment history generally fall outside prime lending, and the gross-up does not change that. It improves the qualifying picture for someone with an established track record. It does not create a track record where none exists.
Why business structure decides the outcome
A sole proprietor or partner reports business income on their personal return. The lender sees the net figure after expenses, and that is precisely the number the gross-up was designed to adjust.
An incorporated owner is in a different position. Income moves from the corporation to the owner in a way the owner largely controls, and the documents a lender reviews reflect that. Because CMHC ties the 15% gross-up to sole proprietorships and partnerships, an incorporated borrower should not assume it will be applied to their file. Their qualifying income is assessed through a different lens, and the strategy for presenting it is different too.
This is where many qualification surprises start. A business owner runs the numbers with a gross-up in mind, settles on a price range, and then learns the calculation does not apply to their structure.
What to do before you apply
If you are self-employed in Ontario and planning a purchase or refinance with less than 20% down, CMHC insurance is in play, since insurance is required above 80% loan-to-value. A few steps make the conversation with a lender much clearer:
For investors, rental income is a separate piece of the file. Lenders generally credit between 50% and 80% of gross rental income toward debt service, and that range interacts with self-employed income in ways worth modelling before you commit to a property.
For agents working with self-employed buyers
If your buyer is self-employed, the question of business structure belongs early, ideally before an offer goes in. A buyer who expects the 15% gross-up but is incorporated may qualify for less than they believe, and that gap tends to appear during the financing condition, when time is short. Encouraging a pre-approval that reflects how their income will actually be read protects the deal and gives everyone a firmer sense of what the buyer can carry.
Sources
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