Guide · Refinancing
Refinancing can save thousands — or quietly cost more than you save once penalties and fees show up. Here's the honest math, the three situations it usually wins, and the trap to avoid.
7 min read · By Sandy Yu
What You'll Learn
A refinance breaks your current mortgage and replaces it with a new one — different rate, different balance, or different amortization. It's a re-set, not a rate tweak.
Because you're breaking the existing contract, your current lender charges a prepayment penalty. That penalty is the single biggest variable in whether refinancing pays off.
Lower your rate
Only worth it when the interest savings clearly exceed the penalty. Usually meaningful when rates have dropped 1%+ since you signed.
Consolidate higher-interest debt
Rolling credit cards (19–24%) or unsecured lines into a mortgage at 5–6% can dramatically lower monthly payments and total interest.
Pull out equity
You can refinance up to 80% of your home's appraised value, minus the current balance, for renovations, investing, a second property, or business capital.
There are two kinds of penalty, and they can differ by thousands of dollars.
3-month interest
Used by most variable-rate mortgages. Simple, predictable: 3 months of interest on your current balance.
IRD (Interest Rate Differential)
Used by most fixed-rate mortgages. The lender calculates what they'll lose by re-lending your balance at today's rates. Can be small or large depending on the lender's calculation method.
Big-bank trap
Big-bank IRD is famously expensive because it's calculated off posted rates, not the discounted rate you actually got. Monoline lenders typically use a fairer IRD method. We'll calculate yours exactly before you commit.
The honest formula: (Interest you save over the remaining term) − (Prepayment penalty + legal/appraisal fees) = Net benefit.
If the net is positive and meaningful, refinance. If it's small, marginal, or negative, hold and revisit at renewal — when there's no penalty at all.
Quick example
On a $500K mortgage with 3 years left at 5.5%, refinancing to 4.5% saves about $15,000 in interest. If the IRD penalty is $6,000 and fees are $1,500, net benefit ≈ $7,500. Worth it. Flip the penalty to $14,000 (common with big-bank IRD) and it's a loss.
Canadian rules cap a refinance at 80% loan-to-value. The math:
Home value
Determined by a current appraisal — not what Zillow or the realtor said last year.
Max new mortgage
80% of appraised value.
Available cash
Max new mortgage − current mortgage balance − penalty − fees = what actually lands in your account.
Penalty exceeds savings
Common in years 1–2 of a 5-year fixed with a big bank. Wait for renewal.
You're moving in <2 years
Most refinances need 2–3 years just to recover the penalty in savings.
Equity take-out for lifestyle spending
Trips, cars, depreciating assets. You're financing them over 25 years at compound interest — almost always a bad trade.
Rate-shopping for 0.1%
Don't break a mortgage to chase a rate that barely moves your payment. The math has to be meaningful.
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Your Next Step
Send a quick note with your current lender, balance, and rate. I'll calculate your exact penalty and net savings — one page, no fluff.