Gross-Up or Add-Back: Two Ways Your Self-Employed Income Can Count in 2026
Two contractors can file nearly identical tax returns and still walk into a mortgage application with different qualifying incomes. The difference often comes down to which of two methods gets used to present their self-employed income to the lender and the mortgage insurer.
As of the end of September 2026, CMHC's guidance for self-employed borrowers describes both routes. Sole proprietorship and partnership income can be grossed up by 15%, or eligible deductions can be added back instead. The 15% figure many people know about is still the same number. What's worth your attention is the second option sitting right beside it, because for some returns it counts more of what you earned. If you're a tradesperson, freelancer or small business owner in BC planning to buy or refinance on an insured mortgage, choosing well can change how much home you qualify for.
Your write-offs and your qualifying income pull in opposite directions
When you run a business, you claim every legitimate expense you can. That's smart tax planning, and it lowers your net income. Lenders start from that same net figure when they work out what you can afford. So the deductions that saved you money in April can make you look smaller on paper when you apply.
Both methods exist to close part of that gap. They just do it differently.
How each method works on your numbers
A gross-up takes your net self-employed income and raises the whole amount by 15%. It's a flat lift, the same percentage no matter how your expenses are made up.
An add-back takes specific eligible deductions from your return and puts them back into your income, dollar for dollar. How much it helps depends on what's actually on your return.
Here's an illustrative example with round numbers. Say your net business income is $60,000.
Gross-up: $60,000 × 1.15 = $69,000 qualifying income.
Add-back: if your return shows $12,000 in deductions that qualify, $60,000 + $12,000 = $72,000.
In that example the add-back wins by $3,000. Change the deductions to $5,000 and the gross-up comes out ahead at $69,000 against $65,000. The two methods are alternatives, so you work with one or the other. Neither is better across the board. The useful habit is running both on your own return before anyone submits an application.
Which income qualifies matters first
The 15% gross-up applies to sole proprietorship and partnership income. If you earn through a corporation, the picture looks different and needs its own review. Many BC contractors start as sole proprietors and incorporate later, so it's worth confirming how your income was earned in each year being reviewed.
The paperwork that makes either method possible
Neither route works without documentation. For high-ratio mortgages, the ones with less than 20% down that need insurance, CMHC asks for 24 consecutive months of self-employed financial statements. Two full years of clean, consistent records give you the most room to choose the method that suits you.
A few other limits are useful to know while you plan. CMHC's self-employed program caps the purchase price at $1.5 million for a home you'll live in and $1.0 million for a small rental. If you own rental property or are buying one, insurers typically count 50% to 80% of gross rental income toward qualifying, which can sit alongside your business income.
A simple step before you apply
Pull your last two tax returns and look at your net income and your deductions side by side. Ask yourself one question: are my eligible deductions worth more or less than 15% of my net income? That answer points you to the stronger method.
Sorting out which deductions count is where a second set of eyes helps. If you'd like, send me your last two returns and I'll run both calculations with you, so you know your real borrowing room before you start looking.
Two contractors can file nearly identical tax returns and still walk into a mortgage application with different qualifying incomes. The difference often comes down to which of two methods gets used to present their self-employed income to the lender and the mortgage insurer.
As of the end of September 2026, CMHC's guidance for self-employed borrowers describes both routes. Sole proprietorship and partnership income can be grossed up by 15%, or eligible deductions can be added back instead. The 15% figure many people know about is still the same number. What's worth your attention is the second option sitting right beside it, because for some returns it counts more of what you earned. If you're a tradesperson, freelancer or small business owner in BC planning to buy or refinance on an insured mortgage, choosing well can change how much home you qualify for.
Your write-offs and your qualifying income pull in opposite directions
When you run a business, you claim every legitimate expense you can. That's smart tax planning, and it lowers your net income. Lenders start from that same net figure when they work out what you can afford. So the deductions that saved you money in April can make you look smaller on paper when you apply.
Both methods exist to close part of that gap. They just do it differently.
How each method works on your numbers
A gross-up takes your net self-employed income and raises the whole amount by 15%. It's a flat lift, the same percentage no matter how your expenses are made up.
An add-back takes specific eligible deductions from your return and puts them back into your income, dollar for dollar. How much it helps depends on what's actually on your return.
Here's an illustrative example with round numbers. Say your net business income is $60,000.
In that example the add-back wins by $3,000. Change the deductions to $5,000 and the gross-up comes out ahead at $69,000 against $65,000. The two methods are alternatives, so you work with one or the other. Neither is better across the board. The useful habit is running both on your own return before anyone submits an application.
Which income qualifies matters first
The 15% gross-up applies to sole proprietorship and partnership income. If you earn through a corporation, the picture looks different and needs its own review. Many BC contractors start as sole proprietors and incorporate later, so it's worth confirming how your income was earned in each year being reviewed.
The paperwork that makes either method possible
Neither route works without documentation. For high-ratio mortgages, the ones with less than 20% down that need insurance, CMHC asks for 24 consecutive months of self-employed financial statements. Two full years of clean, consistent records give you the most room to choose the method that suits you.
A few other limits are useful to know while you plan. CMHC's self-employed program caps the purchase price at $1.5 million for a home you'll live in and $1.0 million for a small rental. If you own rental property or are buying one, insurers typically count 50% to 80% of gross rental income toward qualifying, which can sit alongside your business income.
A simple step before you apply
Pull your last two tax returns and look at your net income and your deductions side by side. Ask yourself one question: are my eligible deductions worth more or less than 15% of my net income? That answer points you to the stronger method.
Sorting out which deductions count is where a second set of eyes helps. If you'd like, send me your last two returns and I'll run both calculations with you, so you know your real borrowing room before you start looking.
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