The 28/36 debt to income ratio is a useful guideline, but it is not the rule that decides every Canadian mortgage file. In practice, Ontario lenders usually qualify mortgages with GDS and TDS, which measure the same basic idea in Canadian underwriting language.
What the 28/36 debt-to-income ratio means
The 28/36 rule means you aim to keep housing costs at or below 28% of gross income and total monthly debt at or below 36% of gross income. Gross income means income before tax and deductions.
The 28% side is the housing limit, sometimes called a front-end ratio. It usually refers to mortgage payments, property taxes, heating costs, and part of condo fees where applicable.
The 36% side is the total debt limit, sometimes called a back-end ratio. It includes the housing costs above plus other required monthly debt payments like credit cards, car loans, lines of credit, student loans, and support payments.
The 28 debt to income ratio is generally conservative for mortgage shopping. A borrower at or below 28% for housing usually has more room for rising taxes, condo fees, or future payment changes, but your actual rate and approval path still depend on your file and the lender.
The 28/36 ratio is best treated as a guideline, not a universal hard cutoff in Canada. Canadian lenders, insurers, and underwriters usually talk in terms of debt service ratios rather than this U.S.-style shorthand.
28/36 rule vs GDS and TDS in Canada
In Canada, the closest match to the 28/36 rule is GDS and TDS. GDS stands for Gross Debt Service, and TDS stands for Total Debt Service.
GDS measures housing costs as a share of gross income. TDS measures housing costs plus other monthly debt obligations as a share of gross income.
A commonly cited Canadian benchmark is GDS around 39% and TDS around 44%, although lender and insurer treatment can differ by file, product, and property type. I tell clients to treat those as underwriting benchmarks, not promises.
Insured and conventional files can be treated differently because lender policy, insurer rules, down payment size, and property use all matter. The same borrower can fit one lender’s ratios and miss another lender’s due to how income is calculated or how debts are counted.
| Measure | What it tracks | Usually includes | Where you see it |
|---|---|---|---|
| 28/36 rule | U.S.-style DTI guideline | 28% housing, 36% total debt | Online articles and calculators |
| GDS | Housing-cost ratio | Mortgage, taxes, heat, and part of condo fees | Canadian mortgage qualification |
| TDS | Total debt ratio | GDS items plus other debts | Canadian mortgage qualification |
How to calculate debt-to-income ratio step by step
The debt-to-income ratio formula is monthly required debt payments divided by gross monthly income, multiplied by 100. That is the core formula behind most debt-to-income ratio calculator tools.
You calculate the housing side first by adding the monthly housing costs the lender will use. That usually means mortgage payment, property taxes, heating, and 50% of condo fees for many condo files.
You calculate the total debt side next by adding your housing costs and your other required monthly debt payments. Required payments usually mean the contractual minimum payment, not whatever extra you choose to pay.
You use gross monthly income, not take-home pay, for both calculations. If your salary is $90,000 per year, your gross monthly income is $7,500.
A simple 28/36 rule example looks like this: if gross monthly income is $6,000, then 28% is $1,680 and 36% is $2,160. That means housing costs at $1,680 fit the 28% guideline, and all debts together at $2,160 fit the 36% guideline.
A simple total DTI example looks like this: if gross monthly income is $5,000 and required monthly debt payments are $1,000, the ratio is 20%. If gross monthly income is $6,000 and debts are $2,000, the ratio is 33.3%.
How to calculate 28 36 rule in practice is straightforward:
1. Add up your gross monthly income. 2. Multiply it by 0.28 for the housing limit. 3. Multiply it by 0.36 for the total debt limit. 4. Compare those limits with your actual monthly obligations. 5. Recheck the numbers using Canadian GDS and TDS because that is how lenders usually underwrite.
What counts in debt-to-income ratio and what does not
The mortgage payment does count in debt-to-income ratio. It sits on the housing side and therefore also affects the total debt side. So if you are asking does debt-to-income ratio include mortgage, the answer is yes.
Housing costs that usually count in Canadian qualification are mortgage payment, property taxes, heating, and part of condo fees. Many lenders use 50% of condo fees in debt service calculations.
Debts that usually count are credit card minimum payments, lines of credit, car loans, car leases, student loans, personal loans, and support payments you are legally required to make. Some lender programs also have specific treatment for business debts and secured lines.
Credit card minimums usually matter more than the full balance for DTI calculations, but the balance still matters to your credit profile and can affect underwriting. Lender treatment can vary by product, so we compare the math before we submit.
Car insurance is usually not included in DTI or debt service ratios. If you are asking is car insurance included in debt-to-income ratio, the usual answer is no, but it still matters for your real monthly budget.
Everyday living costs like groceries, cell phone bills, subscriptions, gas, and clothing are usually not part of formal DTI calculations. They still matter because qualifying for a payment and living comfortably with it are not the same thing.
| Included in DTI/GDS/TDS | Usually not included |
|---|---|
| Mortgage payment | Groceries |
| Property taxes | Cell phone bills |
| Heating costs | Streaming subscriptions |
| 50% of condo fees in many files | Car insurance |
| Credit card minimum payments | Gas and transit |
| Car loans and leases | Day-to-day shopping |
| Student and personal loans | Entertainment spending |
| Support payments owed | Most utilities outside lender formulas |
Worked 28/36 rule examples based on salary
The 28/36 rule calculator based on salary starts with gross monthly income, not home price. That makes it useful as a rough filter before you shop.
If gross monthly income is $4,000, the 28% housing guideline is $1,120 and the 36% total debt guideline is $1,440. With no other debts, that leaves up to $1,120 for housing under the guideline.
If gross monthly income is $6,000, the 28% housing guideline is $1,680 and the 36% total debt guideline is $2,160. If you already have a $450 car loan and $100 in credit card minimums, the room left for housing under the 36% limit drops to $1,610.
If gross monthly income is $8,000, the 28% housing guideline is $2,240 and the 36% total debt guideline is $2,880. Existing debt of $700 would reduce the room for housing under the back-end cap to $2,180.
If gross monthly income is $10,000, the 28% housing guideline is $2,800 and the 36% total debt guideline is $3,600. That is a useful planning number, but not a mortgage recommendation for your situation.
| Gross monthly income | 28% housing limit | 36% total debt limit |
|---|---|---|
| $4,000 | $1,120 | $1,440 |
| $6,000 | $1,680 | $2,160 |
| $8,000 | $2,240 | $2,880 |
| $10,000 | $2,800 | $3,600 |
Income-to-payment table for common Canadian mortgage scenarios
There is no single exact income required for a given mortgage amount because payment changes with rate, amortization, taxes, heating, condo fees, other debts, and the stress test. A pre-approval is usually valid for 90–120 days.
A 25-year amortization is still common, while 30 years may be available in some files and lender categories. Amortization changes payment directly, which changes the income needed to qualify.
A broad planning range for many uninsured mortgage payments is roughly $500 to $650 per month for each $100,000 borrowed, depending on rate and amortization. That is not a live rate quote. It is a planning shortcut only.
Using that rough range, a $400,000 mortgage can mean a payment around $2,000 to $2,600 per month before taxes and heating. The income needed can vary widely once debt ratios and the stress test are applied.
Using the same rough range, a $500,000 mortgage can mean a payment around $2,500 to $3,250 per month before taxes and heating. I cannot quote the income needed without your debts, down payment, credit, and property details.
A $650,000 mortgage can mean a payment around $3,250 to $4,225 per month before taxes and heating, while a $1,000,000 mortgage can mean roughly $5,000 to $6,500 per month before those costs. Property taxes alone can move the file materially in the GTA.
A household with $120,000 salary has gross monthly income of $10,000. Under a pure 28/36 rule, that points to $2,800 for housing and $3,600 for total debt, but actual mortgage size still depends on stress-test qualification, other debts, and the property.
| Scenario | Rough monthly mortgage payment only | Why income needed varies |
|---|---|---|
| $400,000 mortgage | $2,000–$2,600 | Rate, amortization, taxes, heat, debts, stress test |
| $500,000 mortgage | $2,500–$3,250 | Rate, amortization, taxes, heat, debts, condo fees |
| $650,000 mortgage | $3,250–$4,225 | Same factors plus higher taxes in some markets |
| $1,000,000 mortgage | $5,000–$6,500 | Same factors plus larger down payment and file strength |
| $120,000 salary | Not a fixed mortgage amount | Debt load, credit, down payment, property type |
What is an acceptable debt-to-income ratio for a mortgage?
An acceptable debt to income ratio for mortgage qualification in Canada is usually better when it is lower, but there is no single number that guarantees approval. In mainstream Canadian underwriting, ratios around GDS 39% and TDS 44% are commonly referenced benchmarks.
A ratio under 35% is usually a strong affordability position on paper. It shows more room for taxes, heating, condo fees, and budget shocks.
A ratio from 35% to 39% is often workable if the rest of the file is clean. Strong credit, stable income, and a reasonable down payment matter more as you move up the range.
A ratio from 40% to 44% is tighter and more file-dependent. This is where a 40 debt to income ratio, 42 debt to income ratio, or 43 percent debt to income ratio can still be seen on approvable files, but the lender’s income method and debt treatment really matter.
A ratio from 45% to 50% is more challenging in A-lender underwriting and may push the file toward alternative solutions, a lower purchase budget, or debt reduction first. We see this with self-employed clients and debt-consolidation files.
A ratio over 50% usually signals that the payment burden is heavy relative to income. That does not mean no options exist, but it usually means the structure, lender type, down payment, and exit plan need a closer review.
| Ratio | General read | What it usually means |
|---|---|---|
| 28% | Strong | Housing costs are moderate relative to income |
| 36% | Solid guideline | Total debt load is still fairly controlled |
| 40% | Workable on some files | Tighter budget, stronger file helps |
| 42% | Higher leverage | More lender and file sensitivity |
| 43% | Near common upper guideline territory | Often still possible, but depends on the file |
| 45% | Challenging | Fewer mainstream options |
| 50% | Very tight | Usually needs restructuring or alternative lending |
What 40%, 42%, 43%, 45%, and 50% DTI mean in practice
A 40 debt to income ratio means 40% of gross monthly income is already committed to required debt payments. That is not automatically bad, but it leaves less room for qualification and personal cash flow.
A 42 debt to income ratio is a higher-leverage file. It can still be workable, but underwriters will pay closer attention to credit history, income stability, down payment, and the property itself.
A 43 debt to income ratio or 43 percent debt to income ratio is often where borrowers start asking if the file is too tight. It is not automatically too high in Canada, but it is close enough to common TDS benchmarks that small changes in taxes, heating, or credit payments can matter.
A 45 debt to income ratio is generally challenging for prime qualification. At that level, even a modest increase in property taxes or a revolving debt payment can push the file outside one lender’s policy.
A 50 debt to income ratio or 50 percent debt to income ratio usually indicates heavy debt pressure relative to income. Some borrowers at that level still explore B-lender or private options, but costs are usually higher and the strategy matters more than the headline rate.
The same DTI can be viewed differently depending on the file around it. A borrower with strong credit, reserves in the bank, and stable salaried income is not viewed the same way as a borrower with weaker credit, variable self-employed income, and no cash left after closing.
How lenders evaluate DTI beyond the formula
Lenders do not approve a mortgage on DTI alone. They also assess credit history, income stability, down payment, property type, occupancy, and whether the file passes the stress test.
The stress test means you qualify at a rate higher than your contract rate. That is one reason an online debt-to-income ratio calculator can feel more generous than an actual lender decision.
Compensating factors can help when ratios are close. Those factors usually mean stronger credit, more liquid assets, a larger down payment, lower loan-to-value, or cleaner income documentation.
If you exceed a lender’s guideline ratios, the usual outcomes are a smaller approved mortgage, a different lender, a co-borrower added to the file, debt payoff before closing, or a lower purchase target. Those are structure changes, not approval promises.
How co-borrowers, rental income, self-employed income, and investment properties affect qualification
A co-borrower can help by adding income, but that person can also add debts. We always compare both sides because an extra applicant does not improve every file.
A co-signer may support the file differently from a co-borrower, depending on the lender’s policy and how liability is shared. Spouse income can help materially when it is documented and acceptable to the lender.
Rental income can help qualify, but lenders usually use only a portion of it or apply a specific formula rather than counting 100% of the rent. The exact treatment depends on whether the property is owner-occupied, a duplex, or a pure investment property.
Self-employed income is often reviewed more carefully than salaried income. Many lenders want two years of tax documents or accountant-supported financials, and some files are averaged rather than judged on one strong recent month.
Support payments can work either as debt or income depending on direction and documentation. If you pay support, it usually counts against ratios. If you receive support, lenders may count it only when it is documented and likely to continue.
Second homes, investment properties, and new subordinate financing change the ratios because they add carrying costs and can change the lender channel. This is where broker-not-banker matters because we can compare A-lender, B-lender, and private structures across 35+ lenders rather than one bank’s box.
DTI vs debt-to-credit ratio: do not confuse them
Debt-to-income ratio measures required monthly debt against gross monthly income. Debt-to-credit ratio usually means credit utilization, which measures balances against available credit limits.
These two ratios affect different parts of the mortgage decision. DTI affects affordability and qualification, while utilization affects credit scoring and how your credit profile looks to the lender.
A borrower can have an acceptable debt to income ratio for mortgage purposes and still have weak credit because credit cards are near their limits. The opposite can also happen: strong credit scores with too much monthly debt for the target payment.
Credit card balances can hurt both sides at once. The minimum payment affects affordability, and the balance relative to the limit can affect the credit profile.
How to lower your DTI for a mortgage
The fastest way to lower DTI is usually to reduce required monthly debt payments, not just make random extra payments. Paying off a car loan, line of credit, or credit card with a material minimum payment can improve the ratio immediately once the lender can verify it.
Avoid taking on new financing before you apply or before your mortgage closes. A new car payment or financed purchase can change the file more than borrowers expect.
Increasing verifiable income can also help, but lenders only count income they can document and accept. Overtime, bonus, self-employed income, and rental income all have their own rules.
Lowering the purchase budget is often the cleanest fix when ratios are close. I tell clients to compare the payment, the penalty, and the monthly cash flow, not just chase the biggest approval number.
Do not close accounts blindly or move money around without checking the lender impact first. A balance payoff can help, but documentation, timing, and whether the payment is truly removed from the bureau all matter.
Budgeting reality: DTI does not measure your full monthly life
The 28/36 rule does not include everything that makes a payment comfortable in real life. Childcare, groceries, transit, insurance, repairs, savings, and emergency reserves are usually outside formal DTI.
That is why the 28/36 rule is realistic as a screening tool, not as a full household budget. A file can pass lender math and still feel tight once real-life costs show up every month.
A safer plan is to run two tests before you buy: a qualification test and a personal cash-flow test. Closing costs alone often run about 1.5% to 4% of the purchase price, and an appraisal often runs $300 to $500.
A monthly buffer matters more than people think. Condo special assessments, property maintenance, and utility changes are not surprises to homeowners, but they are often ignored in online affordability searches.
Use a calculator, then get an Ontario-specific pre-approval strategy
A mortgage debt-to-income ratio calculator is a good starting point because it helps you estimate the numbers before you shop. We also suggest using a required income calculator and a closing costs calculator so the file makes sense beyond the payment.
Calculator results are not lending decisions. Your actual rate depends on your file and the lender, and we cannot quote a mortgage recommendation without your income, credit, debts, and property details.
A pre-approval usually works best when ratios are close, income is non-standard, or the file includes self-employed, newcomer, rental, or credit-rebuild elements. We pull your credit once, package the file properly, and compare lender options instead of forcing one bank’s product.
If your numbers are close, start with the calculators, gather your income documents and debt statements, and then compare the qualification strategy, not just the headline rate.
FAQ
What is the 28/36 debt-to-income ratio?
It is a guideline that puts housing costs at 28% of gross income and total monthly debt at 36% of gross income.
Is 28/36 good for a mortgage?
It is generally a solid planning guideline, but Canadian lenders usually qualify with GDS and TDS rather than the 28/36 shorthand.
What is a good debt-to-income ratio for a mortgage in Canada?
Lower is generally better, and commonly cited Canadian benchmarks are around GDS 39% and TDS 44%, subject to lender and insurer policy.
What is an acceptable debt-to-income ratio for a mortgage?
An acceptable ratio depends on lender policy, credit, income type, down payment, and property details. Ratios under the common benchmark ranges are generally easier to place.
What does a 40% debt-to-income ratio mean?
It means 40% of gross monthly income is already committed to required debt payments. That is workable on some files, but tighter than a conservative guideline.
Is 40% debt-to-income ratio good?
It can be acceptable, but it leaves less room for payment changes and other costs. The rest of the file matters more at that level.
Is 42 DTI bad?
Not automatically, but it is in a tighter range where stronger credit, stable income, and lower housing costs help.
Is 43 DTI bad?
Not automatically, but it is close to commonly cited upper benchmark territory for total debt servicing in Canada. Small changes in the file can matter.
What is a 45% debt-to-income ratio?
It means 45% of gross monthly income is committed to required debts. Prime options can narrow at that level.
Is 50% debt-to-income ratio good?
Usually no for prime qualification. It often points to a stretched file or the need for restructuring, debt reduction, or alternative lending.
Can I get a mortgage if my DTI is above 43%?
Sometimes, but it becomes much more lender- and file-dependent. Credit, reserves, down payment, and income stability all matter.
How can I lower my DTI for a mortgage?
Reduce required monthly debt payments, avoid new financing, increase verifiable income, or lower the purchase budget.
Does debt-to-income ratio include the mortgage payment?
Yes. The mortgage payment is part of housing costs and also affects total debt servicing.
Do lenders use credit card minimum payments or balances?
For DTI, they usually focus on required minimum payments, though balances still matter for your credit profile and underwriting.
What income do you need for a $500,000 mortgage in Canada?
There is no single answer because payment depends on rate, amortization, taxes, heating, condo fees, debts, and stress-test qualification. A rough mortgage-only payment range is about $2,500 to $3,250 per month before housing add-ons.
How much mortgage can I get with a $120,000 salary in Canada?
There is no fixed amount. Gross monthly income at $120,000 is $10,000, which points to about $2,800 at 28% and $3,600 at 36%, but actual qualification depends on debts, down payment, and the property.
What is the difference between debt-to-income ratio and debt-to-credit ratio?
Debt-to-income measures affordability against income. Debt-to-credit measures balances against credit limits and mainly affects credit profile.
What is the 2 2 2 rule for mortgages?
That phrase is not a standard Canadian mortgage qualification rule. If you see it online, check the source carefully because it is not the same as GDS, TDS, or the stress test.
