Rental Property Refinance Rules in 2026: LTV, DCR, and the Stress Test, Explained

If you have ever been quoted a rental refinance rate and then watched the file fall apart at underwriting, you have run into one of the three rules every uninsurable rental mortgage has to pass. None of them are negotiable, but all of them are gameable if you know what each lender is actually measuring.

This is the working version of the rulebook, written for landlords — not underwriters.

Rule 1: 80% LTV Hard Cap on Refinances

Every rental refinance in Canada is uninsurable, which means the maximum loan-to-value is 80% of the appraised value. There is no exception, no insurance workaround, no portability trick. The number that matters is the appraisal, not your purchase price.

On a property that appraised at $750,000:

• Max mortgage: $600,000
• If your current balance is $410,000, the maximum equity you can pull is $190,000 minus refi costs (~$1,800).

Two practical implications:

The appraisal is the negotiation. A clean comparable set, recent rent rolls, and good condition photos move the appraisal. Most landlords just hand the appraiser the keys and accept whatever number comes back. Don't.

Don't assume you can hit 80%. Even if LTV allows it, the next two rules usually constrain the file below 80% before LTV does.

Rule 2: Debt Coverage Ratio (DCR)

This is the single test that most kills rental refinance applications. DCR asks: does the rent cover the carrying cost?

> DCR = (Gross Rent × Vacancy Allowance) ÷ (Mortgage Payment + Property Tax + Heat + Condo Fees)

The vacancy allowance is usually 2% (multiplied as 0.98) on long-term rentals. Some lenders use 5% for short-term or seasonal markets.

Worked Example: Toronto Duplex

• Gross rent: $3,800/mo × 12 × 0.98 = $44,688/yr
• Mortgage payment at 4.69% × 30yr on $600K = $3,089/mo × 12 = $37,068
• Property tax: $4,800
• No heat (tenant pays)
• PITH total: $41,868
• DCR: 44,688 ÷ 41,868 = 1.067

A DCR of 1.067 fails almost every A-lender (most need 1.10–1.20). To get this file to fund at 80% LTV, the borrower needs to either accept a lower loan amount (say $550K, which drops DCR-friendly), extend amortization to 35 years (some monolines), or move to a credit union with a 1.05 DCR floor.

Worked Example: Calgary Condo

• Gross rent: $2,300/mo × 12 × 0.98 = $27,048/yr
• Mortgage payment at 4.74% × 30yr on $300K = $1,557/mo × 12 = $18,684
• Property tax: $1,950
• Condo fees: $4,200
• PITH total: $24,834
• DCR: 27,048 ÷ 24,834 = 1.089

Same story — close, but not clean. Calgary condos with high fees regularly fail DCR despite "looking" like cash-flow properties.

Rule 3: The Stress Test

OSFI's B-20 stress test applies to every rental refinance, every rental purchase, and every rental renewal where you change lenders. The qualifying rate is the greater of contract+2% or 5.25%.

At a 4.69% contract rate, you qualify at 6.69%. That payment then flows into both the DCR test (some lenders) and the personal TDS test (all lenders).

The stress test caught a lot of landlords in 2023–2024 when rates spiked. In 2026, with rental rates in the high 4s, contract+2% is still the binding number on every file we run.

How Rental Income Counts Against Your Personal TDS

Even when DCR clears, your personal income still has to absorb part of the mortgage payment under most lenders' policies. There are three formulas in common use:

50% Add-Back (Most Banks): Half of gross rent is added to your income; 100% of PITH stays in your debt servicing. Most punitive — typical TDS hit is real.

80% Offset (Most Monolines): 80% of gross rent is subtracted from PITH first; the net positive flows into income and the net negative into debt servicing. Significantly friendlier.

DCR-Only (Some Credit Unions and B-lenders): If DCR clears 1.10, the rental is "self-supporting" and personal income isn't tested at all on that property. Best for portfolio investors.

The choice of formula is why two lenders can quote the same rate and one approves while the other declines. A broker who runs rentals will know which formula to lead the file with.

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The Decision Tree

Here is the order to think about a rental refinance in 2026:

1. Get an updated appraisal estimate (your broker can pull comps and AVM ranges before you order a full appraisal).
2. Calculate DCR at the target loan amount. If under 1.10 at A-lender pricing, drop the loan amount until it clears — or move to a credit union.
3. Check the stress-tested payment against your personal TDS using the 80% offset formula (most favorable). Cap of 44% TDS for most A-lenders, up to 50% at some credit unions.
4. Only then look at rate. Rate matters, but a file that doesn't fit the lender's box doesn't fund at any rate.

For the bigger-picture playbook on rental renewals and refinances — including switch costs, timelines, and when to pull equity — see the Refinancing & Renewing a Rental or Investment Property Mortgage in Canada: The 2026 Playbook.