Credit card debt reaches a mortgage application in two ways. Its required payment is added to your debt ratios, which can lower the most a lender will lend you, and its balance relative to your limits affects your credit score, which decides which lenders and rates are open to you. This page works through both. It is part of our mortgage lenders and brokers guides.
The payment lenders count
Lenders don’t use the minimum payment you choose to make. For an insured mortgage, CMHC sets the floor: Unsecured lines of credit and credit cards count at a monthly payment of at least 3% of the balance. Many lenders apply the same rule to uninsured mortgages.
| Card balance | Monthly payment counted at 3% |
|---|---|
| $5,000 | $150 |
| $10,000 | $300 |
| $15,000 | $450 |
| $25,000 | $750 |
That payment goes into your total debt service ratio. For an insured mortgage, CMHC caps your housing costs at 39% of gross income (GDS) and your housing costs plus other debt payments at 44% (TDS); lenders set their own limits for uninsured mortgages. How both ratios are built is explained in GDS and TDS ratios.
When a balance starts to cut your maximum mortgage
Because the TDS limit sits 5 percentage points above the GDS limit, other debt payments up to that share of gross income don’t reduce the maximum mortgage when GDS is the limit that binds. Above it, every extra dollar of debt payment is a dollar less for the mortgage.
Example: household income of $100,000, a qualifying rate of 5.5%, a 25-year amortization, $4,000 a year in property tax and $1,500 in heating, and no other debts. The GDS limit leaves about $2,792 a month for the mortgage payment, which supports a mortgage of about $457,400. The TDS limit leaves room for about $417 a month of other debt payments before it becomes the tighter limit, which at 3% of the balance is a card balance of about $13,900.
| Card balance | Payment counted | Limit that binds | Maximum mortgage | Reduction |
|---|---|---|---|---|
| $0 | $0 | GDS | $457,400 | none |
| $5,000 | $150 | GDS | $457,400 | none |
| $10,000 | $300 | GDS | $457,400 | none |
| $15,000 | $450 | TDS | $451,900 | $5,500 |
| $25,000 | $750 | TDS | $402,700 | $54,700 |
Beyond the point where TDS binds, each extra $1,000 of card balance lowers the maximum mortgage by about $4,900 in this example. A car loan, student loan or line of credit uses up the same TDS room first, so with other debts the card balance starts to cost you sooner.
The ratios are calculated at the stress-test rate, not the rate you’ll pay: Your debt service ratios are calculated at that qualifying rate, not your actual rate. See the mortgage stress test.
The effect on your credit score
Your card balances also change your score through credit utilization, the share of your available credit you’re using. Utilization is calculated from the balances on your statements, so paying a card down before its statement date lowers what the bureaus see. How utilization is scored is explained in credit utilization, and the score bands lenders use are in the credit score needed for a mortgage. For a CMHC-insured purchase, at least one borrower or guarantor needs a credit score of 600 or more; CMHC may use other ways to judge creditworthiness for a borrower with no credit history.
A lower score can move you from a bank to a B-lender, at a higher rate: lenders by credit band are compared in mortgage lenders for bad credit. The rest of the score preparation before an application is in improving your credit score for a mortgage.
How other debts are counted
| Debt | Payment lenders usually count |
|---|---|
| Credit cards and unsecured lines of credit | At least 3% of the balance a month |
| Secured line of credit or HELOC | Lender policy varies; ask how the lender calculates it |
| Car loan or lease | The actual monthly payment |
| Student loan | The actual payment; lenders set their own rule for loans not yet in repayment |
| Personal loan | The actual monthly payment |
| Child or spousal support you pay | The monthly amount |
| Another mortgage | Its payment (and that property’s costs) |
Paying it down before you apply
| Approach | How it works | What to watch |
|---|---|---|
| Avalanche or snowball | Extra payments go to the highest-rate card first, or the smallest balance first | Compared in debt avalanche vs snowball |
| Balance transfer | A promotional rate on a new card while you pay the balance down | A new card adds a hard inquiry and a new account before your application; see the balance transfer calculator |
| Consolidation loan | One fixed payment at a lower rate | The loan payment still counts in TDS, though usually less than 3% of the card balances; see debt consolidation loans |
| TFSA savings | Withdrawals aren’t taxed, and the room comes back the following January 1 | Money used here isn’t available for the down payment |
| RRSP withdrawal | Taxable, and the contribution room used is lost | Usually the costliest source |
A wider plan for clearing card debt is in how to get out of credit card debt, and the trade-off between paying debt and saving for the down payment is in paying off debt vs saving for a house.
A timeline
| Before applying | What to do |
|---|---|
| 12 months | Stop adding to the balances and start paying them down |
| 6 months | No new credit accounts |
| 2-3 months | Pay cards before their statement dates so lower balances are reported |
| 1-2 months | Check both credit reports to confirm the lower balances show |
| At application | Keep statements that show the balances, in case the lender asks |
Can you get approved with card debt?
Yes. Card debt doesn’t disqualify you on its own. What matters is whether your TDS stays within the limit at the qualifying rate, whether your score meets the lender’s minimum, and whether your payment history is clean. Applying without waiting can make sense when the balance is small enough to sit inside the TDS room, when a co-borrower’s income absorbs it, or when the lender will approve the mortgage on condition that the card is paid off before closing. If an application has already been declined over debt, see what to do when your mortgage is denied and qualifying for a larger mortgage. What lenders read in your bank statements, including payments to debts not on your application, is covered in lenders and your bank statements.
Sources
The figures and rules on this page come from these sources, last checked against them between September 25, 2026 and September 29, 2026. How we check facts.