What Is Refinancing and How Does It Work?
Refinancing means replacing your current mortgage with a new one — usually to get a lower interest rate, change your loan term, or access your home equity as cash. Your new lender pays off your old mortgage, and you begin making payments on the new loan.
Refinancing always comes with closing costs (typically $3,000–$6,000 in the US, or a prepayment penalty in Canada). This is why timing matters — you need to stay in the home long enough to recoup those costs through your monthly savings.
Sign #1: Rates Have Dropped at Least 1% Below Your Current Rate
The classic rule of thumb is to refinance when you can lower your rate by at least 1 percentage point. On a $350,000 mortgage, dropping from 7.5% to 6.5% saves approximately $230/month — that's $2,760/year and over $82,000 over the remaining loan term.
| Loan Balance | Rate Drop | Monthly Savings | Annual Savings |
|---|---|---|---|
| $300,000 | 7.5% → 6.5% | $197/mo | $2,364/yr |
| $300,000 | 7.5% → 6.0% | $294/mo | $3,528/yr |
| $450,000 | 7.5% → 6.5% | $296/mo | $3,552/yr |
| $450,000 | 7.5% → 6.0% | $441/mo | $5,292/yr |
Even a 0.75% rate drop can be worth it on larger loan balances. Use our mortgage calculator to run the exact numbers for your balance and rate.
Sign #2: Your Credit Score Has Improved Significantly
Your credit score directly determines the interest rate you're offered. If your score was 640 when you first got your mortgage but has since climbed to 740+, you may now qualify for a rate that's 0.5%–1.5% lower — even if market rates haven't changed.
| Credit Score | Typical Rate (30-yr Fixed US) | On $350K Loan |
|---|---|---|
| 620–639 | 7.8% | $2,516/mo |
| 660–679 | 7.2% | $2,382/mo |
| 700–719 | 6.8% | $2,293/mo |
| 740+ | 6.4% | $2,188/mo |
Moving from a 620 score to 740+ could save you $328/month on that loan — that's $3,936 per year purely from the credit score improvement, with no change in market rates.
Sign #3: You Want to Switch from an ARM to a Fixed Rate
If you took out an Adjustable Rate Mortgage (ARM) or variable-rate mortgage and rates have risen — or you're worried they'll rise further — refinancing to a fixed rate locks in your payment permanently. This is especially valuable if:
- Your ARM's introductory period is ending and the rate is about to adjust upward
- You plan to stay in the home long-term (10+ years)
- Rising payments are creating budget stress
- You want payment certainty for budgeting purposes
In Canada, most mortgages renew every 5 years. At renewal, you're essentially refinancing — so this is a natural time to compare rates across lenders, not just accept your current bank's renewal offer.
Sign #4: You Want to Shorten Your Loan Term
If your income has grown since you took out a 30-year mortgage, refinancing into a 15-year can dramatically cut your total interest paid — even if the rate drop is small.
Example: Refinancing a $300,000 30-year mortgage (year 5, at 7%) into a 15-year at 6.3%:
- Monthly payment goes up by ~$380
- But you save over $140,000 in total interest
- And you're mortgage-free 10 years sooner
This makes the most sense when you have at least 20+ years left on your current mortgage and can comfortably afford the higher payment.
Sign #5: You Need Cash for a Major Expense (Cash-Out Refinance)
A cash-out refinance lets you borrow against your home equity — you refinance for more than you owe and receive the difference in cash. Common uses include home renovations, paying off high-interest debt, or funding education.
This makes sense only when:
- Your new mortgage rate is significantly lower than what you'd pay on a personal loan or credit card
- You're using the cash to increase your home's value (renovations) or eliminate higher-interest debt
- You have substantial equity (most lenders require 20%+ remaining after the cash-out)
How to Calculate Your Break-Even Point
Before refinancing, always calculate your break-even point. It's simple:
| Step | Example |
|---|---|
| 1. Total closing costs | $4,500 |
| 2. Monthly payment savings | $230/month |
| 3. Break-even (÷) | $4,500 ÷ $230 = 19.5 months |
In this example, if you plan to stay in the home for at least 20 months (under 2 years), refinancing is worth it. Every month after that, you're saving $230. Over 5 more years, that's $13,800 in savings after covering the closing costs.
Special Rules for Refinancing in Canada
Refinancing works differently in Canada than in the US:
- Prepayment penalties: Breaking a fixed-rate mortgage mid-term in Canada typically triggers an Interest Rate Differential (IRD) penalty, which can be very large — sometimes $10,000–$20,000+. Always calculate this before refinancing outside of renewal.
- Best time to refinance in Canada: At your mortgage renewal date (typically every 5 years). You can switch lenders freely at renewal with no penalty.
- Variable rate mortgages in Canada typically have a smaller penalty (3 months interest) making mid-term refinancing more feasible.
- Maximum refinance: Canadian lenders allow refinancing up to 80% of your home's value (no CMHC insurance available for refinances).
3 Refinancing Mistakes to Avoid
- Resetting your loan term unnecessarily. If you're 8 years into a 30-year mortgage and refinance into a new 30-year, you've just added 8 years of payments back on. Refinance into the same remaining term or shorter instead.
- Not shopping multiple lenders. Getting quotes from only one lender is one of the most expensive mistakes homeowners make. Even a 0.25% rate difference on a $400,000 loan saves over $18,000 over 30 years. Get at least 3 quotes.
- Refinancing too close to paying off the mortgage. If you have only 5–8 years left, the interest savings are small and may not cover closing costs. Run the break-even calculation first.