GDS and TDS Ratios in Canada: Why Banks Decline You (2026)

Both ratios use the same denominator: your gross monthly income before tax. What changes is the numerator. The comparison below is how a Canadian underwriter sees the two numbers.

Run the Brampton couple through it. Gross income of $96,000 is $8,000 a month. Their stressed mortgage payment came to about $2,500 (the real payment at their contract rate was closer to $2,060), property tax $300, heat $120, and half of a $300 condo fee is $150. Housing costs total $3,070, so GDS is 38.4%.

Under the wire, barely.

Then the underwriter added a $450 car payment and $200 in credit card minimums. Total obligations reach $3,720 a month, and TDS lands at 46.5%. That's two and a half points over the 44% ceiling, and the file is dead. Notice what killed it: not the house, the car.

Insured vs. uninsured files

The 39% and 44% caps are hard limits only on insured mortgages (less than 20% down). On uninsured files, each bank sets its own internal ceiling, and many hold it lower, closer to 32% GDS and 40% TDS, depending on credit score and how "clean" the income looks. A strong file at one bank is a decline at the next. That inconsistency is why so many borrowers get two different answers in the same week.

Most declined borrowers have already done the math on a calculator and passed. So why does the bank say no? Because the bank isn't using your numbers. It's using its own, and four adjustments push more files over the line than anything else.

1. The stress test payment, not your real payment

Under OSFI Guideline B-20, federally regulated lenders must calculate your ratios at the greater of your contract rate plus two percentage points or 5.25%. OSFI confirmed in January 2026 that this rule stays in place. The mortgage payment in your GDS line is therefore hundreds of dollars higher than the one you'd actually pay. For the Brampton couple, that gap alone was worth more than five points of TDS.

2. Self-employed income gets averaged and discounted

If you're self-employed, the bank uses the two-year average of the net income on your Canada Revenue Agency Notice of Assessment, not what your business actually deposits. A contractor in Saskatoon grossing $180,000 who writes off aggressively might show $70,000 on line 15000. The ratios are then run against $70,000. The bank statements that prove the real cash flow never enter the calculation.

3. Only half your rental income counts

CMHC lets lenders add 50% of gross rental income to your income, or offset it against the property's costs, but rarely the full amount. Investors carrying two or three units are often declined on TDS while their actual cash flow is positive. On paper, the bank sees a borrower drowning in mortgage payments. In reality, tenants are paying them.

4. Small balances with big minimum payments

A $15,000 line of credit at 3% of balance per month adds $450 to your TDS numerator. Some banks use 3% even when the actual minimum is lower, and a leased vehicle with eight months left counts for the full payment. None of this reflects your risk twelve months from now. It reflects a formula, applied the same way to everyone, and the formula doesn't know your business is having its best year.

Not every decline is a private-lending situation. If you're within four or five points of the cap, one of these moves can get a bank file back on track. Call it the 5-Lever Ratio Fix, and work the levers in this order because the top ones move the number fastest.

1. Kill the smallest high-payment debt first. A $9,000 car loan with a $450 payment costs you roughly 5.6 points of TDS on an $8,000 monthly income. Paying it out with savings, or refinancing it into a longer term, usually does more than any other single step.
2. Consolidate revolving balances into the mortgage or a second mortgage. Three cards at 3% minimums become one payment amortized over 25 years. The dollar total stays similar. The monthly figure in the TDS line drops sharply. A second mortgage is often the tool for this when the bank won't refinance.
3. Add a co-borrower's income. A spouse, parent, or business partner on title adds their full gross income to the denominator. Their debts come along too, so run the combined math before you assume it helps.
4. Stretch the amortization. Moving from 25 to 30 years on an uninsured mortgage lowers the stressed payment. Insured mortgages are capped at 25 years unless you're a first-time buyer or purchasing a new build.
5. Fix the income side, not just the debt side. Self-employed borrowers can add back CCA, business-use-of-home, and other non-cash deductions at some lenders. A larger down payment reduces the mortgage, which reduces the stressed payment, which reduces both ratios at once.

Here's the honest limit of this list. If your TDS is at 58%, or your NOA income is a third of your real income, you're not five points away, and no amount of shuffling gets you there with an A lender this year. That's the moment to stop applying to banks and change lenders. Every additional application is another hard inquiry on your Equifax Canada file for a result you already know.

Private and alternative mortgage lenders in Canada aren't federally regulated, so OSFI's stress test and CMHC's 39/44 caps don't bind them. Most don't run GDS or TDS as a pass/fail gate at all. They underwrite the property and the exit, then read the borrower's real cash flow to make sure the payments are sustainable.

Three things carry the file instead. Loan-to-value comes first: the ratio of total mortgages against the appraised value, with most private first mortgages sitting at or below 75% to 80% LTV and seconds lower. The exit strategy comes second: a clear, dated plan for how you'll refinance to a bank, sell, or pay the loan down, which is why a private mortgage exit strategy matters more than your credit score. Real income evidence comes third: twelve months of bank statements showing what actually lands in the account, not a two-year NOA average.

So what does that mean for a borrower who just failed TDS at 47%? It means the decline was about a formula, not about whether you can pay. A Vancouver real estate investor with three rentals, positive monthly cash flow, and 40% equity across the portfolio is a routine private file and a structural bank decline. Same borrower, different lens.

The trade-off is real and worth saying plainly. Private mortgages cost more than bank mortgages and run on shorter terms, typically one to two years. They're a bridge, not a destination.

Used correctly, the bridge buys you the time to pay down the car loan, season two more years of self-employed income, or wait for equity to grow, and then walk back into a bank with ratios that pass. Our view is that a borrower with strong equity and provable cash flow shouldn't lose a home, or a deal, because a 44% line drawn for insured mortgages got applied to a file it was never designed for.

Solid Capital is a Canadian alternative lender offering private mortgages and business financing to homeowners and business owners the big banks have declined or under-served. Instead of stopping at GDS, TDS, or a credit score, a Canadian advisor reads the whole file: your bank statements, your equity, your exit plan, and the business behind the income. If your ratios failed but your cash flow didn't, start an application. It takes about five minutes, there's no impact to your credit to apply, and you'll get a straight answer.

The bank ran a formula. You're not a formula. Get a second read.

What is a good GDS ratio in Canada?

For an insured mortgage, CMHC caps GDS at 39% of gross monthly income. Many banks prefer to see 32% or lower on uninsured files, and a GDS under 30% is considered comfortable by almost every A lender. Anything between 35% and 39% will pass at some banks and fail at others.

What is the maximum TDS ratio for a mortgage in Canada?

The CMHC maximum for insured mortgages is 44%. On uninsured mortgages, banks set their own limits, often 40% to 44% depending on credit score and income type. Private lenders generally don't apply a hard TDS cap and rely on loan-to-value and real cash flow instead.

Does the stress test change my GDS and TDS ratios?

Yes. Under OSFI's Guideline B-20, federally regulated lenders calculate both ratios using a qualifying rate that's the greater of your contract rate plus 2% or 5.25%. That inflated payment raises your GDS and TDS by several points compared with your actual payment, and it's the most common reason a file that passes on a calculator fails at the bank.

Do private mortgage lenders use GDS and TDS?

Most don't use them as pass/fail tests. Private lenders in Canada aren't bound by OSFI's B-20 or CMHC's ratio caps. They focus on loan-to-value, the property, your exit strategy, and bank statements showing real cash flow. Some still calculate the ratios as a reference, but a high TDS alone rarely declines a private file.

How do I lower my TDS ratio fast?

Pay out or refinance the debt with the highest payment relative to its balance, usually a short-term car loan or a card near its limit. Consolidating revolving debt into a longer-term loan or second mortgage lowers the monthly figure the bank counts. Adding a co-borrower's income also works, as long as their own debts don't erase the gain.