How much does a lower credit score increase my mortgage rate?

The impact varies by lender tier. Within A-lenders (680+), the difference between a 680 and 780 score is roughly 0.10%–0.25% in rate. Below 680, the jump is much larger: B-lender rates are typically 1%–3% higher than A-lender rates. A borrower with a 600 score might pay 6.50%–7.50% vs 4.20%–4.50% for someone at 780. On a $400,000 mortgage over 5 years, that difference costs $30,000–$55,000 in extra interest.

Do all mortgage lenders use the same credit score thresholds?

No. Each lender sets its own internal credit policies. Most A-lenders use 680 as a hard minimum, but how they price within the 680+ range varies. Some lenders offer their best rates only above 760, while others treat all 680+ borrowers similarly. B-lenders each have their own tiered pricing structure. A mortgage broker can shop across lenders to find the best rate for your specific score.

Can I negotiate a better mortgage rate if my credit score is borderline?

Sometimes. If your score is just above a lender threshold (e.g., 685) and you have strong compensating factors — low debt ratios, stable employment, large down payment — a broker may be able to negotiate a better rate or find a lender with more favourable pricing at that level. Compensating factors matter more in manual underwriting situations.

Is it worth delaying my mortgage to improve my credit score?

If you are within 20–40 points of 680 and can realistically improve within 3–6 months (by paying down credit cards, correcting errors, or letting time pass after a late payment), the interest savings over a 5-year term are substantial — often $5,000–$15,000+. If you are 100+ points away from 680, you may need 12–24 months, and the calculation depends on whether home prices will rise faster than your savings.

How Your Credit Score Affects Your Mortgage Rate in Canada

Your credit score doesn’t just determine whether you get a mortgage — it directly determines how much you pay. Here’s the precise relationship between your score and your rate in Canada.

The rate ladder: score tiers and pricing

A-lender rate tiers (2026 estimates)

Credit Score	Rate Tier	5-Year Fixed Rate Range	Rate Premium vs Best
780+	Top tier	4.09%–4.29%	— (baseline)
760–779	Excellent	4.14%–4.34%	+0.05%
740–759	Very good	4.19%–4.39%	+0.10%
720–739	Good	4.24%–4.49%	+0.15%–0.20%
700–719	Solid	4.34%–4.59%	+0.20%–0.30%
680–699	Minimum A-lender	4.44%–4.69%	+0.25%–0.40%

B-lender rate tiers

Credit Score	Rate Tier	5-Year Fixed Rate Range	Premium vs A-Lender Best
650–679	Top B-lender	5.50%–6.50%	+1.40%–2.20%
600–649	Mid B-lender	6.00%–7.50%	+1.90%–3.20%
550–599	Lower B-lender	7.00%–8.50%	+2.90%–4.20%
500–549	Bottom B-lender	8.00%–10.00%	+3.90%–5.70%

Private lender rates

Credit Score	Rate Range	Premium vs A-Lender Best
Any score	8.00%–15%+	+3.90%–10.90%+

The dollar impact: what your score costs you

On a $400,000 mortgage (5-year term, 25-year amortization)

Credit Score	Rate	Monthly Payment	5-Year Interest Paid	Extra Cost vs 780+
780+	4.19%	$2,154	$94,800	—
740	4.34%	$2,175	$96,100	+$1,300
700	4.49%	$2,197	$97,400	+$2,600
680	4.59%	$2,211	$98,300	+$3,500
650 (B-lender)	6.00%	$2,418	$115,100	+$20,300
600 (B-lender)	7.00%	$2,566	$126,800	+$32,000
550 (B-lender)	8.00%	$2,718	$138,900	+$44,100

On a $600,000 mortgage (5-year term, 25-year amortization)

Credit Score	Rate	Monthly Payment	5-Year Interest Paid	Extra Cost vs 780+
780+	4.19%	$3,231	$142,200	—
740	4.34%	$3,263	$144,200	+$2,000
700	4.49%	$3,295	$146,200	+$4,000
680	4.59%	$3,317	$147,500	+$5,300
650 (B-lender)	6.00%	$3,627	$172,600	+$30,400
600 (B-lender)	7.00%	$3,849	$190,200	+$48,000
550 (B-lender)	8.00%	$4,077	$208,400	+$66,200

Lifetime cost on a $500,000 mortgage (25-year amortization)

Credit Score	Rate	Total Interest (25 years)	Extra vs 780+
780+	4.19%	$294,000	—
680	4.59%	$327,000	+$33,000
650 (B-lender, assume 2 years then A)	Blended ~4.80%	$347,000	+$53,000
600 (B-lender, assume 3 years then A)	Blended ~5.20%	$381,000	+$87,000
550 (B-lender, assume 5 years then A)	Blended ~5.60%	$418,000	+$124,000

A 550 score vs 780 score can cost over $120,000 in extra interest on a $500,000 mortgage — even assuming you improve and refinance to A-lender rates within 5 years.

Why credit score affects rate

Factor	How It Works
Default risk	Lower scores correlate with higher probability of missed payments
Insurance eligibility	Scores below 680 cannot access default insurance at most lenders, which raises the lender’s risk
Automated underwriting	Most A-lenders use automated systems with hard score cutoffs
Capital requirements	Regulators require lenders to hold more capital for riskier loans
Lender competition	High-score borrowers attract multiple offers, pushing rates down

The 680 cliff

The single most important threshold in Canadian mortgage lending is 680. Above it, you’re an A-lender borrower. Below it, you’re in B-lender territory.

Metric	Score 679	Score 681
Lender tier	B-lender	A-lender
Typical rate (5-yr fixed)	5.50%–6.50%	4.44%–4.69%
Lender fee	0.50%–1.50%	$0
Broker fee	0.50%–1.00%	$0
Monthly payment ($400K)	$2,418–$2,566	$2,211–$2,238
5-Year interest	$115K–$127K	$98K–$101K

A 2-point difference across the 680 threshold can save $15,000–$25,000 over a 5-year mortgage term. This is why credit optimization before a mortgage application is critical.

Beyond score: compensating factors

Lenders consider your full profile. Strong compensating factors can help offset a borderline score.

Factor	How It Helps	Lender Impact
Large down payment (25%+)	Reduces LTV and lender risk	May offset 10–20 points of score weakness
Low debt ratios (GDS <30%, TDS <35%)	Strong repayment capacity	Improves manual underwriting decisions
Stable employment (5+ years)	Predictable income	Provides underwriter confidence
Significant savings/assets	Financial buffer	Demonstrates financial responsibility
Clean recent history	All payments current for 12+ months	Shows recovery and current reliability
Property quality	Desirable location, standard construction	Stronger collateral reduces lender risk

What doesn’t help

Factor	Why It Doesn’t Offset Score
High income	Income is assessed separately; doesn’t override poor credit history
Long credit history	Matters for the score itself, but past negatives still show
Good explanation for late payments	A-lender automated systems don’t accept explanations; manual review might

Variable rate considerations

Score Impact on Variable Rate	Detail
A-lender variable	Prime – discount (e.g., prime – 0.80%). Higher scores may get larger discount
B-lender variable	Prime + premium (e.g., prime + 1.50%–3.00%). Score determines the premium
HELOC	Prime + 0.50% to prime + 2.00%. Score affects the spread

Strategies for getting the best rate at your current score

Your Score	Best Strategy
760+	Shop aggressively — use a broker to find the absolute best rate
720–759	Standard shopping; you’ll get strong offers from most lenders
680–719	Focus on lenders where your score falls in a favourable tier; ask broker about discretionary pricing
660–679	Delay 2–4 months to push above 680 if possible; otherwise, best B-lender rate
600–659	Consider delaying 6–12 months to improve; if urgent, shop B-lenders through a broker
Below 600	Focus on credit rebuilding; if purchase is urgent, accept B-lender/private as a bridge

Quick wins to improve rate eligibility

Action	Score Impact	Timeline
Pay credit cards below 30% utilization	+20 to +50 points	1–2 billing cycles
Correct errors on credit report	+10 to +100 points	30–90 days
Become authorized user on partner’s card	+10 to +30 points	1–3 months
Stop applying for new credit	+5 to +20 points	3–6 months
Pay off a collection (negotiate pay-for-delete)	+25 to +75 points	30–60 days