The 28/36 Rule is a "rule of thumb" used by lenders to establish a baseline for what you can afford to pay per month for a mortgage. It states that a mortgage applicant should spend no more than 28% (front end) of their gross monthly income on housing expenses and no more than 36% (back end) on total debt. Total debt includes housing plus recurring debt like student loans, car expenses, and credit card payments.

Lenders typically work off of the lesser of the two amounts calculated.

Calculate Front End - 28% of gross monthly income


Note: This guide is for estimate purposes only. There are additional factors to consider when applying for a mortgage. Consult a licensed mortgage broker for details regarding your situation.


Debt to Income = Monthly Debt Payments / Gross Monthly Income

The Back End of the 28/36 Rule uses the Debt to Income ratio to help lenders determine what you can afford to pay in terms of a monthly mortgage. The below formula does not give you your debt to income ratio. Rather, it takes your monthly debt (excluding housing) and determines your maximum allowable monthly mortgage payment at 36% Debt to Income.

Calculate Back End - 36% total debt






Note: This guide is for estimate purposes only. There are additional factors to consider when applying for a mortgage. Consult a licensed mortgage broker for details regarding your situation.