What is mortgage payment shock?

Payment shock is the increase in your mortgage payment when you renew at a higher interest rate than your current rate. For example, if you locked in at 2.0% in 2021 and renew at 4.5% in 2026, your payment could increase 30–50%. On a $500,000 mortgage, that could mean $700–$1,200 more per month.

How much will my mortgage payment go up at renewal?

It depends on the rate difference, your balance, and remaining amortization. As a rough guide: each 1% increase in rate adds approximately $55–$60 per month per $100,000 of mortgage balance (on a 25-year amortization). So on a $400,000 mortgage, a 2% rate increase would add roughly $440–$480/month.

Can I extend my amortization at renewal to lower payments?

Yes, if you renew with a different lender, you can typically extend your amortization back to 25 or 30 years (subject to qualification). If you stay with your current lender, some will offer extended amortization as a retention tool. Extending your amortization lowers payments but increases the total interest you pay over the life of the mortgage.

What is the mortgage renewal wall in Canada?

The renewal wall refers to the large volume of mortgages coming up for renewal in 2025–2027 that were originated during the ultra-low-rate period of 2020–2022. Approximately $450 billion or more in mortgages will renew during this period at rates 2–4% higher than the original rate. The Bank of Canada and OSFI have flagged this as a financial stability concern.

Mortgage Payment Shock Calculator Guide: How Much Will Your Renewal Cost?

Between 2020 and 2022, millions of Canadians locked in mortgage rates between 1.5% and 3.0%. Those mortgages are now renewing at rates of 4.0%–5.0% or higher. The result is payment shock — a sudden, significant increase in monthly mortgage costs that can strain household budgets.

This guide walks you through exactly how to calculate your payment increase and plan for it.

How to calculate your payment shock

The formula

Your new payment depends on three variables:

Variable	Where to Find It	Example
Remaining balance at renewal	Your annual mortgage statement or lender portal	$420,000
New interest rate	Current rate offers from lenders	4.50%
Remaining amortization	Your mortgage statement (original amortization minus years elapsed)	20 years remaining

Step-by-step calculation

Find your current balance — check your lender’s online portal or last annual statement
Estimate the renewal rate — check current 5-year fixed rates at major lenders
Know your remaining amortization — original amortization minus years since you started
Use the tables below to find your approximate new payment

Payment shock tables

Monthly payment per $100,000 of mortgage balance

Interest Rate	15-Year Amortization	20-Year Amortization	25-Year Amortization	30-Year Amortization
1.50%	$621	$483	$400	$345
2.00%	$644	$506	$424	$370
2.50%	$667	$530	$449	$395
3.00%	$691	$555	$474	$422
3.50%	$715	$580	$500	$449
4.00%	$740	$606	$527	$477
4.50%	$765	$633	$555	$507
5.00%	$791	$660	$584	$537
5.50%	$817	$688	$614	$568
6.00%	$844	$716	$644	$600
6.50%	$871	$746	$675	$632
7.00%	$899	$775	$707	$665

To find your payment: multiply the per-$100K figure by your balance in hundreds of thousands. For example, $400,000 balance at 4.50% with 20 years remaining = $633 × 4 = $2,532/month.

Payment increase examples

Scenario 1: 2021 buyer renewing in 2026

Factor	Original (2021)	Renewal (2026)
Mortgage amount	$500,000	$465,000 (balance after 5 years)
Interest rate	2.00%	4.50%
Amortization	25 years	20 years remaining
Monthly payment	$2,120	$2,943
Monthly increase		+$823 (+39%)
Annual increase		+$9,876

Scenario 2: 2020 buyer with minimum down payment

Factor	Original (2020)	Renewal (2025–2026)
Mortgage amount	$450,000 (incl. CMHC premium)	$418,000
Interest rate	1.79%	4.30%
Amortization	25 years	20 years remaining
Monthly payment	$1,856	$2,594
Monthly increase		+$738 (+40%)
Annual increase		+$8,856

Scenario 3: Variable-rate holder who triggered fixed payments

Factor	Original (2021)	Current reality
Mortgage amount	$600,000	$580,000
Original variable rate	1.45% (prime − 1.00%)	Adjusted to prime − 1.00% = ~3.95%
Fixed payment set at	$2,340/month	Still $2,340/month (but more going to interest)
Amortization impact	25 years original	Now 35+ years (negative amortization)
If forced to renew at 4.50%/25yr		$3,219/month (+$879)

Payment increase by rate jump

How much more will you pay per $100,000 of balance when your rate increases?

Rate Increase	Additional Monthly Cost per $100K (25yr amortization)	On $300K Balance	On $500K Balance	On $700K Balance
+0.50%	+$26	+$78	+$130	+$182
+1.00%	+$53	+$159	+$265	+$371
+1.50%	+$81	+$243	+$405	+$567
+2.00%	+$110	+$330	+$550	+$770
+2.50%	+$140	+$420	+$700	+$980
+3.00%	+$170	+$510	+$850	+$1,190
+3.50%	+$201	+$603	+$1,005	+$1,407

The renewal wall: how many Canadians are affected

Volume of mortgages renewing (2025–2027)

Year	Estimated Volume Renewing	Average Rate at Origination	Likely Renewal Rate	Average Payment Increase
2025	~$300 billion	2.5–3.5%	4.0–4.5%	+15–25%
2026	~$350 billion	1.8–2.8%	4.0–4.5%	+25–45%
2027	~$250 billion	2.0–3.0%	3.5–4.5%	+20–35%
Total	~$900 billion

2026 is the peak renewal year because it’s when the ultra-low 2021 originations hit their 5-year maturity.

Who is most at risk

Risk Level	Profile	Estimated Payment Increase
Highest	2021 buyer, variable rate, high GDS ratio	+40–60%
High	2020–2021 buyer, fixed rate at <2.5%	+30–45%
Moderate	2022 buyer (bought at higher rates but paid more for the home)	+15–25%
Lower	Pre-2020 buyer with significant equity and income growth	+10–20%
Minimal	2023–2024 buyer (already at higher rates)	+0–10%

Strategies to manage payment shock

Before renewal

Strategy	How It Works	Potential Savings
Use prepayment privileges now	Make lump-sum payments to reduce balance before renewal	Lower balance = lower payment at any rate
Increase payment frequency	Switch to accelerated bi-weekly now	Reduces balance slightly faster before renewal
Build a buffer fund	Save the difference between current and expected new payment	Eases transition (aim for 6 months of the increase)
Start shopping 120 days early	Get rate holds from multiple lenders 4 months before maturity	Locks in best available rate
Consider a shorter term	If you expect rates to fall further, a 2–3 year term may save money	Could renew again at even lower rates

At renewal

Option	How It Helps	Trade-off
Switch lenders	Negotiate harder — new lender acquisition rates are often better	Requires re-qualification; appraisal may be needed
Extend amortization	Spread payments over longer period → lower monthly cost	Increases total interest paid significantly
Blend and extend (current lender)	Combine current rate with new rate for a new term	May not be the best rate available
Choose variable rate	If rates are expected to drop, variable may save money	Payment uncertainty
Negotiate with current lender	Ask for their best rate — they don’t want to lose you	Results vary

Extending amortization: the numbers

Original Scenario	20 Years Remaining	Extended to 25 Years	Extended to 30 Years
Balance: $450,000, Rate: 4.50%
Monthly payment	$2,849	$2,498	$2,281
Savings vs 20yr	—	$351/month	$568/month
Additional interest over term	—	+$18,000 (5yr term)	+$29,000 (5yr term)
Additional interest (lifetime)	—	+$55,000	+$125,000

Extending amortization is a powerful short-term tool but has a significant long-term cost. Use it as a bridge, not a permanent solution — and make extra payments when you can.

How payment shock affects your budget

The GDS/TDS reality check

Metric	Guideline	What Payment Shock Does
Gross Debt Service (GDS)	Should be ≤32% of gross income	Payment increase pushes GDS higher
Total Debt Service (TDS)	Should be ≤40% of gross income	Combined with car loans, credit cards → may exceed limits

Example: household budget impact

Item	Before Renewal	After Renewal (+$800/mo)
Mortgage payment	$2,200	$3,000
Property tax	$400	$400
Utilities	$300	$300
Car payment	$450	$450
Groceries	$1,200	$1,200
Insurance (home + auto)	$350	$350
Childcare	$1,500	$1,500
Savings/TFSA/RRSP	$500	$0 (eliminated)
Discretionary spending	$800	$200 (cut by 75%)
Total expenses	$7,700	$7,400
Household take-home income	$8,500	$8,500
Monthly surplus	$800	$1,100 (but savings wiped out)

The math works — barely. But the household has lost all savings capacity and most discretionary spending. This is the squeeze that millions of Canadian households are facing.

What the Bank of Canada says about payment shock

The Bank of Canada has identified mortgage renewal risk as a key financial stability concern:

BoC Assessment	Detail
Peak risk year	2026 — highest volume of ultra-low-rate renewals
Estimated average payment increase	20–30% for fixed-rate renewals, up to 50%+ for some variable
Stress test cushion	Most borrowers qualified at rate + 2% — provides buffer, but some will still struggle
Lender guidance	Banks are expected to work with borrowers (extended amortization, modified payments)
Systemic risk assessment	Low to moderate — most borrowers will absorb the shock; concentrated risk in highly leveraged households

The bottom line

If you locked in between 2020 and 2022, expect a 25–45% payment increase at renewal — plan now, not when the renewal letter arrives
Each 1% rate increase adds roughly $55/month per $100K of balance — use this to estimate your personal impact
Start shopping 120+ days before renewal — rate holds give you time and leverage
Extending amortization is a valid short-term tool — but understand the lifetime cost
The stress test helps — but doesn’t eliminate risk — borrowers at their maximum qualification are most vulnerable
Contact your lender early if cash flow is tight — options exist, but only if you ask before you miss payments