A Treadstone Group Company Hustle and GritHustle & GritWatch us on YouTube
Canadian Mortgage Glossary · Qualification & Ratios

Income Gross-Up

Definition

Income gross-up is a method some Canadian lenders use to increase a borrower’s qualifying income above the amount actually received, applied to non-taxable income sources — such as certain benefit or disability payments — before calculating GDS and TDS.

Also known as: gross-up Updated: August 2, 2026 Reviewed by the Treadstone underwriting desk
№ 01

Why would a lender count more income than a borrower actually receives?

Non-taxable income has no tax withheld from it, so its real spending power is higher than the same dollar amount of taxable income. A gross-up approximates the equivalent pre-tax income a borrower would need to have the same after-tax amount available, before it feeds into qualifying income and the GDS ratio.

The gross-up percentage and which income sources qualify are set by each lender rather than by a single standardized rule, and the borrower still needs to document that the income is genuinely non-taxable. The same principle — recognizing more value than the raw dollar figure shows — also appears in how some lenders treat rental income through rental offset.

The gross-up approach

Grossed-up qualifying income = Non-taxable income + ( Non-taxable income × Gross-up % )

№ 02

How it’s used in Canada

Lender-specific policy: the gross-up percentage and which income sources qualify are set individually by each lender, with no single standardized federal rule.

Common non-taxable sources: certain child-related benefits, some disability payments, and select foreign or exempt income are typical candidates for a gross-up, subject to lender policy.

Feeds directly into GDS/TDS: the higher, grossed-up figure — not the actual dollar amount received — becomes part of qualifying income used in the ratio calculations.

Documentation still required: lenders require proof the income is genuinely non-taxable before applying any gross-up.

№ 03

Worked example

A borrower receives $1,000 per month in non-taxable benefit income; the lender on this file applies a 25% gross-up:

Non-taxable benefit income$1,000
Gross-up addition (this lender’s policy, 25%)$250
Grossed-up qualifying income = $1,250
Gross-up rate set by the lender

$1,000 + ($1,000 × 25%) = $1,250. The 25% gross-up is this lender’s own policy — rates and eligible income types vary by lender, so always confirm the specific rules with the lender being used.

Sources

  1. 1.Financial Consumer Agency of Canada — Getting preapproved for a mortgage canada.ca
  2. 2.CMHC — Debt service ratio standards for insured mortgages (GDS 39% / TDS 44%) cmhc-schl.gc.ca

Definitions reflect Canadian federal and provincial rules as of the “Updated” date above. Not advice for any specific file.

Keep exploring

The Canadian Mortgage Glossary

Every term a Canadian mortgage professional needs — defined, sourced, and kept current.

Got 15 minutes?

See how Treadstone can scale your brokerage — a free call, no commitment.