Home / Money / Home Buying / When to Refinance Your Mortgage

Money Guide

When to Refinance Your Mortgage

When refinancing pays off and when it does not: the breakeven calculation, why the 1.5 to 2% rate-drop rule is not actually a rule, rate-and-term vs cash-out, the no-cost trap, and the Canadian Interest Rate Differential penalty that turns mid-term refinancing into a five-figure mistake.

Estimate the cost side of the breakeven with the Closing Cost Calculator, and log the before-and-after with the printable Mortgage Amortization Tracker.

The short version

Refinance when you will stay in the home longer than the breakeven: closing costs divided by monthly savings. $4,000 of closing costs that buys $200/month of savings breaks even at 20 months. Stay longer than that, the refinance pays; move sooner, it loses. Everything else in this guide is detail on what goes into each side of that division, plus the Canadian penalty math that changes the answer entirely mid-term.

Price the cost side: closing costs (US 2 to 6% of the loan; Canada legal + appraisal + discharge), plus any prepayment penalty (Canada: the IRD, often five figures mid-term).
Price the savings side: new monthly payment vs old, at the same remaining term, not a stretched one.
Divide: costs / monthly savings = breakeven in months. Compare against how long you realistically expect to stay.
Check the term reset: if you have under 5 to 7 years left, a new 30-year loan can raise total interest even while the payment drops.
Canada: check the calendar first. If renewal is within a year or two, waiting usually beats paying the IRD.

The breakeven math

One division decides every refinance:

Breakeven (months) = total refinance costs / monthly savings. Worked example: $4,000 of closing costs, new payment $200/month lower. Breakeven = 4,000 / 200 = 20 months. If you will own the home for more than 20 months, the refinance is positive math; the savings after month 20 are real money. If a job move or upsizing is plausible inside 20 months, you are paying $4,000 for the privilege of a smaller payment you will not hold long enough to profit from.

Count every cost, not just the lender's list. US: origination, appraisal, title, recording, prepaids, typically 2 to 6% of the loan. Canada: legal work (CAD 800 to 1,500), appraisal (CAD 300 to 500), discharge fee (CAD 200 to 400), and the prepayment penalty if you are breaking a closed term, which can dwarf everything else combined.
Measure savings at the same remaining term. Comparing a new 30-year payment against an old loan with 22 years left flatters the refinance by stretching the debt. Get the quote at a matching term (or do the comparison on total interest, not monthly payment).
Be honest about the stay. The median US homeowner moves roughly every 12 years, but the median refinancer is often someone restless. Use your real plans, not the national average.

The 1.5 to 2% rule, and why it is not a rule

The traditional advice says refinance when rates drop 1.5 to 2% below yours. That rule dates from an era of smaller balances and pricier closings; today it is just a crude proxy for the breakeven, and it misleads in both directions:

Big balance, long runway: even 0.75% pays. On a $400,000 balance with 25 years left, a 0.75% drop saves roughly $190/month. Against $4,500 of closing costs, that is about a 2-year breakeven on a loan you will hold far longer. Math says yes long before the old rule does.
Small balance, short runway: 2% may not be enough. On a $100,000 balance with 10 years left, a full 2% drop saves about $95/month. Against $3,500 of costs, the breakeven is over 3 years, and the term-reset interest math (below) eats much of the rest.
The honest version of the rule: the rate drop matters only through what it does to the breakeven on YOUR balance and YOUR remaining term. Run the division; ignore the folklore.

Rate-and-term vs cash-out

Rate-and-term refinance: same balance, new rate and/or new term. This is the pure savings play; the entire question is the breakeven above. It is also the version no-cost offers target (next section).
Cash-out refinance: a bigger loan that pays off the old one and hands you the difference in cash. Example: you bought with a $250,000 loan and the home is now worth $400,000; refinance into a $300,000 loan, retire the $250,000 balance, and pocket roughly $50,000 before costs. The price: closing costs on the full new loan, usually a slightly higher rate than rate-and-term, a reset amortization, and lenders typically cap the new loan at 80% of the home's value.
The discipline test for cash-out: the equity you extract is secured by your house. Renovations that add value and debt consolidation paired with a real spending fix can justify it; vacations and vehicles almost never do.

The no-cost refinance trap

"No closing costs" does not mean free; it means financed through the rate. The lender covers your closing costs and charges typically 0.25 to 0.5% more than the rate you would get paying costs up front. That is sometimes the right trade, which is exactly why it deserves the math:

Short expected stay: no-cost can win. If you may move or refinance again within 2 to 3 years, paying $4,000 up front to save $200/month never reaches breakeven; a no-cost structure at a slightly higher rate captures most of the savings with none of the sunk cost.
Long stay: no-cost quietly loses. The 0.25 to 0.5% premium compounds for as long as you hold the loan. On a $300,000 balance, 0.375% extra is roughly $65 to $75/month, which repays the lender's "free" closing costs in about 5 years and then keeps charging you for decades.
How to compare honestly: get the same lender to quote both versions on the same day, then compute the breakeven between them: closing costs / (no-cost payment minus paid-cost payment). Shorter than your expected stay, pay the costs; longer, take no-cost.

Cash-out vs HELOC vs personal loan

Three ways to turn equity (or credit) into cash, each built for a different spending shape:

Tool	Rate and structure	Costs	Best for
Cash-out refinance	Lowest rate; fixed; resets the full mortgage onto a new 30-year amortization	Full closing costs on the whole new loan	One large, known expense (major renovation) when the new rate on the entire balance is acceptable
HELOC	Higher, variable; revolving line, interest only on what you draw	Low or no closing cost; small annual fee common	Staged or uncertain spending; keeping a good first-mortgage rate untouched
Personal loan	Highest rate; fixed; 2 to 7 year terms	Little to none; fastest to fund	Smaller amounts repaid within a few years, with no lien on the house

Doing the renovation-or-consolidation math next to your other balances? The Debt Payoff Calculator compares the avalanche and snowball orders on everything you owe.

When NOT to refinance

You may move within about 3 years. Most paid-cost refinances break even between 18 and 36 months; a plausible move inside that window makes the whole exercise a donation to your lender.
Less than 5 years left on the loan. A refinance resets the amortization curve onto its interest-heavy early years. Late in a loan, your payments are mostly principal; restarting trades cheap principal-heavy months for expensive interest-heavy ones, and total interest paid INCREASES even as the monthly payment falls.
Your credit score has dropped since the original loan. The advertised rates that triggered the itch are priced for 740+ borrowers. If your score slid, your real quote may not clear the breakeven at all; check your reports before paying for an appraisal.
Rates are likely to keep falling near-term. Refinancing costs money each time. If the rate environment is visibly mid-descent, a few months of patience can be worth thousands; you cannot time it perfectly, but refinancing into a falling knife twice in 18 months pays two sets of costs.
You would give up an assumable or portable loan. Rare but valuable: US VA and FHA loans can be assumable by a future buyer (a marketing asset when rates are high), and many Canadian mortgages are portable to the next house. Refinancing can extinguish features worth more than the rate drop.

Canada: the Interest Rate Differential (IRD) penalty

Breaking a closed Canadian mortgage before the end of its term triggers a prepayment penalty, and for fixed-rate mortgages it is usually not the gentle one. The penalty is the greater of:

(a) 3 months' interest on your remaining balance, or
(b) the IRD: roughly (your rate minus the lender's current rate for a term matching your remaining time) x remaining balance x remaining years.

Worked example. $400,000 balance at 5.5% with 3 years left in the term, while the lender's current 3-year rate is 4.5%. IRD = (5.5% - 4.5%) x $400,000 x 3 = about $12,000. Three months' interest would be roughly $5,500, so the IRD applies. And this is the friendly version: big banks often compute the IRD from their posted rates rather than the discounted rate you actually got, which can push the same penalty to $20,000 to $30,000+. Variable-rate mortgages usually cap the penalty at 3 months' interest, one of their quiet advantages.

The IRD goes on the cost side of the breakeven. A $12,000 penalty plus $1,500 of legal and appraisal against $250/month of savings is a 54-month breakeven, on a term with 36 months left. That is the arithmetic shape of "not worth it," and it is the common case mid-term.
Ask your lender for the exact payout figure. Every lender must quote the penalty on request, and the formula details (posted vs discounted rate) vary enough that estimates are only for orientation.
Blend-and-extend is the middle path. Many lenders will blend your existing rate with current rates into a new term without the cash penalty; the penalty is effectively baked into the blended rate, but it avoids the five-figure cheque and sometimes beats waiting.

Canada: renewal vs refinance

The single most useful Canadian distinction, and the one that saves the most money:

Renewal happens at the end of every term, penalty-free. Canadian mortgages run in terms (typically 5 years) inside a 25- or 30-year amortization. At each renewal you can renegotiate the rate, change the term length, or move the whole mortgage to a different lender with NO prepayment penalty; the new lender often covers the transfer costs to win your business.
Refinance is mid-term and triggers the IRD. Same paperwork, same lawyers, plus a penalty that frequently exceeds every other cost combined.
The strategy that follows: if renewal is within roughly 18 to 24 months, park the refinance itch and prepare to shop hard at renewal instead (do not sign the lender's first renewal letter; it is rarely their best rate). If you genuinely cannot wait, price blend-and-extend against the full IRD break before deciding.
Mark the renewal date somewhere you will see it. Lenders count on auto-renewals at posted rates. A calendar reminder 120 days out (when most lenders allow early renewal rate-holds) is worth real money.

The documents you will need

A refinance is underwritten like the original mortgage; gather the package before applying and the process takes weeks, not months:

Income verification: 30 days of pay stubs and 2 years of W-2s (US) or T4s (Canada); self-employed borrowers add 2 years of tax returns (US) or Notices of Assessment (Canada).
Bank statements: the 2 most recent for every account, with large deposits explainable.
Current mortgage statement: balance, rate, and (Canada) the exact term maturity date and penalty quote.
Home appraisal: usually required and lender-ordered ($400 to $700 US / CAD 300 to 500); cash-out and high loan-to-value refinances always get one.
Insurance and tax documents: proof of homeowners insurance and the latest property-tax bill.

Common refinance mistakes

1. Refinancing to a longer term and reading the lower payment as savings. Stretching 22 remaining years back to 30 drops the payment almost regardless of rate, while total interest climbs. Compare total interest at a matched term before celebrating the monthly number.
2. Cash-out to pay off credit cards without fixing the spending. The cards are clear for a season, the habit refills them, and now the same consumer debt exists twice: once in the mortgage and once on the re-maxed cards, secured by your house. Consolidation only works welded to a budget fix.
3. Refinancing right before selling. Closing costs need their 20-ish-month breakeven; a sale inside it converts the refinance into a pure fee. If the move is on the horizon, leave the loan alone.
4. Ignoring the breakeven because the new rate "looks lower." A rate is not a deal until the division says so: costs (including any Canadian IRD) divided by true monthly savings, compared against your honest expected stay.

FAQ

When is refinancing my mortgage worth it?

Run the breakeven: divide the refinance closing costs by the monthly payment savings to get the number of months you must stay in the home to recoup the cost. If $4,000 of closing costs buys you $200/month of savings, the breakeven is 20 months; staying longer than that makes the refinance positive math, moving sooner makes it a loss. The old 1.5 to 2% rate-drop rule of thumb is just a proxy for this calculation: on a large balance with many years remaining, even a 0.75% drop can clear breakeven quickly, while on a small balance with under 10 years left you might need 2% or more. In Canada, add the Interest Rate Differential penalty for breaking a closed mortgage mid-term to the cost side before computing breakeven; it often pushes the answer to "wait for renewal."

How much does refinancing cost?

US refinances typically run 2 to 6 percent of the loan amount, with $3,000 to $7,000 common on mid-size balances: origination, appraisal ($400 to $700), title insurance, recording, and prepaids, essentially the purchase closing-cost list minus the inspection and transfer tax in most states. Canadian refinances add legal work (CAD 800 to 1,500), an appraisal (CAD 300 to 500), a possible mortgage discharge fee (CAD 200 to 400), and, if you are breaking a closed term early, the prepayment penalty: the greater of 3 months' interest or the Interest Rate Differential, which can run five figures. "No-cost" refinances are not free; the costs are baked into a rate typically 0.25 to 0.5% higher. Price the cost side line by line with the Closing Cost Calculator.

What is the Interest Rate Differential (IRD) penalty in Canada?

The IRD is the prepayment penalty most Canadian lenders charge for breaking a closed fixed-rate mortgage before the end of its term. The penalty is the GREATER of 3 months' interest or the IRD itself: roughly (your rate minus the lender's current rate for a term matching your remaining time) times your balance times the remaining years. Example: a $400,000 balance at 5.5% with 3 years left, when the lender's current 3-year rate is 4.5%, gives (5.5% - 4.5%) x $400,000 x 3 = about $12,000. Big-bank IRD calculations based on posted rates often come out higher than that simple version. The IRD is why Canadian refinancing usually waits for renewal, when no penalty applies.

Should I do a cash-out refinance or a HELOC?

Match the tool to the spending shape. A cash-out refinance gives one lump sum at the lowest rate with full closing costs and a reset amortization; it suits a single large, known expense like a major renovation, and only makes sense if the new rate on the WHOLE balance is acceptable. A HELOC is a revolving line at a higher variable rate with little to no closing cost; it suits staged or uncertain spending because you only pay interest on what you draw. A personal loan funds fastest with no home risk but at the highest rate, fitting smaller amounts you can repay within a few years. The classic mistake is a cash-out refinance that raises the rate on the entire mortgage to access a small amount of equity, which is exactly the case a HELOC exists for.

Does refinancing restart my mortgage?

Yes, unless you deliberately match the remaining term. A new 30-year loan replaces whatever was left of the old amortization, and because early payments are interest-heavy, refinancing late in a loan resets you onto the steepest part of the interest curve; the monthly payment can drop while total interest paid INCREASES. With less than about 5 years remaining the math almost never works. The fix when the rate drop is genuinely good: refinance into a shorter term (15 or 20 years) or keep the new payment equal to your old one so the extra goes to principal; track either plan year by year with the Mortgage Amortization Tracker.

Bottom line

A refinance is a purchase: you are buying a lower rate, and the price is closing costs plus, in Canada, a possible five-figure IRD penalty. Buy it only when the breakeven (costs divided by monthly savings) is comfortably shorter than your honest expected stay, when the remaining term will not reset you onto the interest-heavy part of a new curve, and when the same money would not do more elsewhere. US borrowers: shop 3+ quotes in a tight window and price no-cost against paid-cost on the same day. Canadian borrowers: check the renewal date before anything else; the penalty-free renegotiation window arrives every 5 years, and most "should I refinance" questions are really "can I wait 14 months" questions.