Mortgage refinance break-even: look beyond a lower payment

What refinance break-even does—and does not—mean

A cash-flow break-even estimate asks how long a regular payment reduction would take to equal the costs of refinancing. It is a first-pass household-budget check, not proof that changing your mortgage leaves you financially better off.

A lower payment may result from a lower rate, a longer repayment schedule, or both. Extending amortization can reduce today’s payment while increasing interest paid over time. FCAC explicitly warns about this trade-off in its mortgage renewal guidance. Compare balances and interest over the same period before treating payment relief as savings.

A simple $7,000 / $350 example

Suppose total refinance costs are $7,000, paid upfront from cash, and the comparable monthly mortgage payment falls by $350. These are illustrative inputs, not an offer, a quoted rate or a prediction.

This calculation assumes the reduction starts immediately and remains unchanged, with no additional costs. It ignores the time value of money, differences in principal repayment and future mortgage rates. It is not true total interest savings or economic break-even.

If the monthly reduction is zero or negative, there is no positive cash-flow payback under this formula. If you expect to sell, refinance again or reach renewal before the estimated payback date, do not assume the reduction continues beyond that point.

Gather actual costs before comparing

1. Request an exact payout quote. Ask your current lender for the prepayment penalty and other charges for your intended closing date. Do not replace that quote with a generic percentage or assume every lender uses the same calculation.
2. List transaction costs. Include applicable legal or notary, appraisal, discharge, registration and administration charges. Ask whether any cash-back amount must be repaid and identify which costs a new lender will actually cover.
3. Separate cash costs from financed costs. If a fee is added to the new mortgage, include it in the new principal and payment comparison. Financing a cost does not make it disappear: interest may be charged on it. The simple upfront-cash example does not model that arrangement.
4. Compare realistic alternatives. Request costs for refinancing now, waiting until renewal, and any available option with your current lender. Check quote expiry dates and whether approval or an appraisal is still required.

FCAC explains that breaking a closed mortgage normally involves a prepayment penalty, describes other possible fees and cash-back repayment, and directs borrowers to their financial institutions for actual costs: Breaking your mortgage contract. For switching costs at renewal, see Renewing your mortgage.

How the payment estimate is modelled

FundPath’s refinance calculator estimates monthly principal-and-interest payments using a Canadian fixed-mortgage convention: a nominal annual interest rate compounded semi-annually, converted to an equivalent monthly rate. It is an assumption for the calculation, not a claim that every Canadian mortgage uses identical terms.

With annual rate j written as a decimal, the monthly rate is r = (1 + j/2)^(1/6) − 1. For principal P and n monthly payments, payment is P × r / (1 − (1 + r)^−n). At zero interest, payment is P / n. These formulas describe the tool’s methodology; use the lender’s actual payment schedule for a decision.

The mortgage term is the period your contract conditions apply. Amortization is the planned repayment period, usually spanning multiple terms. Do not enter the years remaining in your current term as the remaining amortization. FCAC’s renewal explanation describes why most mortgages require multiple terms before full repayment.

The model does not reproduce variable-rate contracts, accelerated biweekly schedules, daily interest adjustments or future renewal rates. Property taxes, insurance and other housing costs are not principal and interest. Compare equivalent payment frequencies and include those separate costs in your household budget.

Lower-rate refinancing and extra borrowing are different

First compare the existing balance at the new rate using the same remaining amortization. That helps isolate the effect of the rate. Then examine any proposed extra borrowing or amortization extension separately rather than attributing all payment relief to a better rate.

If refinancing pays off other debts, the calculator can include payments being replaced in the cash-flow comparison. Only include payments that will actually stop. A reduction in combined monthly obligations is not a reduction in the debt itself, and moving debt into a mortgage puts it against your home. Compare remaining balances and total interest over a common horizon.

Take the proposed payment to a paycheque and bill calendar to check its timing. A monthly improvement can still leave a tight week before payday.

Questions to ask before proceeding

Does reaching 20 months mean I should refinance?

No. It only describes this example’s payment-based cost recovery. Review principal remaining, interest, contract flexibility, costs and how long you expect to keep the mortgage.

Is renewing the same as refinancing?

No. Renewal continues mortgage financing at the end of a term under new conditions. Refinancing may change the balance or structure. Ask the lender how your proposed transaction is classified and which qualification requirements and fees apply.

What should I bring to a lender conversation?

Your current balance, rate, remaining amortization, term-end date, payment schedule, payout quote and itemized new offer. Use our Canadian mortgage refinancing guide for the broader process. FundPath provides education and referrals, not mortgage advice or approval.