Cash-Back Mortgages and Rate Buydowns: Are They Worth It?

A lender offers you thousands of dollars in cash when your mortgage funds. A builder offers to lower your rate for the first few years. Both can help, and both are paid for somewhere. This guide is for buyers, and owners renewing or refinancing, who are weighing cash back or a lower rate: how each works, the math over a five-year term, and what to check before you sign.

The short version

How a cash-back mortgage works

The Financial Consumer Agency of Canada (FCAC) describes cash back as an optional feature that pays you a portion of your mortgage amount in cash right away. The catch, FCAC says, is that your rate is usually higher, and the extra interest may cost more than the cash you receive.

• How much. RBC's cash back mortgage pays up to 7% of the mortgage, to a maximum of $20,000, on fixed closed terms of 1 to 10 years. Libro Credit Union, in Ontario, pays 2.5% on five-year terms, to a maximum of $12,500.
• When it arrives. RBC pays the cash on the date the mortgage is advanced, and Libro pays it at closing. Your down payment must be in place before then, and FCAC warns you may not be able to use the cash for it; Libro's terms rule it out.
• What it's for. FCAC mentions costs such as legal fees, and RBC lists land transfer tax (in BC, the property transfer tax), lawyer's fees and moving costs. The cash comes when the mortgage funds, so plan to cover those costs from your own money at closing.

Some banks also run promotions that pay a fixed amount, including when you switch lenders, with conditions attached. TD's offer running to December 29, 2026, for example, pays within five months of funding and requires payments from a TD chequing account.

Running the numbers over a five-year term

Here is an example with rates close to recent five-year fixed rates, not anyone's offer. In August 2026, Bank of Canada data put the average rate on new fixed mortgages with terms of five years or more at 4.12% for insured loans and 4.58% for uninsured ones. Take a $500,000 mortgage over 25 years:

• Regular rate, 4.5%. About $2,767 a month.
• Cash-back rate, 5.4%, with 4% cash back. You receive $20,000 when the mortgage funds and pay about $3,023 a month, about $256 more.

Over five years, the higher rate costs about $21,600 in extra interest: about $15,300 in higher payments, plus a balance about $6,300 higher at renewal. That is about $1,600 more than the cash. At these numbers, the cash-back mortgage only comes out ahead if its rate is below about 5.33%. This simple comparison ignores what the cash could do for you meanwhile.

Leaving early doesn't help. If the lender claws back the cash for the months left in the term, as RBC's and Libro's terms describe, breaking the mortgage after three years means repaying $8,000 after paying about $13,100 in extra interest, about $1,100 behind before any prepayment penalty. For what drives rates, see How Fixed Mortgage Rates Are Set.

Rate buydowns: a lower rate, paid for up front

A buydown is the reverse trade: money paid up front to lower your rate, for the whole term or a shorter period such as the first year or two. Before paying for one, ask for a discount: FCAC suggests asking your lender. On a new home, the builder may pay for it as an incentive: Business in Vancouver has reported Metro Vancouver presale marketers offering mortgage buydowns, along with covering closing costs or strata fees.

On the same $500,000 mortgage, a buydown from 4.5% to 3.5% for the five-year term lowers the payment from about $2,767 to about $2,496, about $271 a month, and saves about $23,800 in interest over the term. Two things to weigh:

• It ends. At renewal, you pay whatever rates are then, with no buydown. A temporary buydown ends sooner: if this one lasted two years, the payment would rise by roughly $250 to $270 a month after year two, depending on how it is set up.
• A price cut lasts longer. The same money taken off the price lowers what you borrow for the whole amortization, and can lower your minimum down payment. Ask whether the builder would cut the price instead.

For deposits and other presale rules, see Buying a Presale Condo in BC.

How lenders and insurers treat incentives

Mortgage insurer Sagen's underwriting policy accepts incentives up to 0.5% of the purchase price; above that, the amount, including a builder interest rate buydown, is deducted from the purchase price, and so is any cash the builder gives you, none of which can count as your equity. On a $700,000 presale, that threshold is $3,500. A lower price for insurance purposes raises your loan-to-value ratio, so you may need a larger down payment.

Cash paid to a buyer under the contract raises the same issue. BCFSA, BC's real estate regulator, said in a November 2025 advisory that clients should disclose cash-back clauses to the lender, that lenders generally treat them as a reduction in the purchase price, which can mean a smaller mortgage, and that they can constitute mortgage fraud. Tell your lender, in writing, about every incentive in your contract.

The stress test and your contract rate

To qualify, you show you could afford payments at a higher rate. For uninsured mortgages from federally regulated lenders such as banks, OSFI's minimum qualifying rate is the greater of your contract rate plus 2% or 5.25%, and CMHC applies the same test to insured mortgages. So your contract rate moves your qualifying rate. On the same $500,000 mortgage over 25 years:

• 4.5% contract rate. You qualify at 6.5%, a payment of about $3,349.
• 5.4% cash-back rate. You qualify at 7.4%, about $3,626, so your income needs to support about $277 more a month.
• 3.5% bought-down rate. You qualify at 5.5%, about $3,052. At 3.25% or less, the 5.25% floor applies.

With a temporary buydown, ask which rate the lender will use to qualify you. A straight switch at renewal, moving the same balance and amortization to a new lender, generally isn't subject to the test. For how the debt ratios work, see How Much House Can You Afford?

Penalties, clawbacks and portability

FCAC says breaking a fixed-rate mortgage usually costs the higher of three months' interest or an interest rate differential (IRD), which compares your rate with a current rate for the time left. A higher contract rate tends to raise both. In the example, three months' interest after three years would be about $6,300 at 5.4%, against about $5,200 at 4.5%. With a cash-back mortgage, the clawback comes on top. Libro's terms also ask for a prorated share of the cash if you renew early, and don't allow a blend and extend during the term.

Moving before the term ends? Ask whether you can port the mortgage and whether porting triggers the clawback. I explain the options in Porting, Blending or Breaking, and how to compare penalties in Comparing Mortgage Offers.

Questions to ask before you sign

• The rates. What is the rate with and without the cash back or buydown, and the total interest over the term for each?
• The cash. When is it paid, and what conditions apply?
• The clawback. How much would I repay if I break, refinance, port or renew early?
• The buydown. Who pays, for how long, and what will my payment be when it ends?
• Qualifying. Which rate will you use to qualify me, and how will the insurer treat the incentive?

Questions buyers often ask me

Can I use cash back for my down payment?

Generally no. FCAC notes that lenders may not allow it, and the cash only arrives when the mortgage funds, after your down payment must already be in place.

Do I have to repay the cash back if I sell?

Often, in part. RBC and Libro, for example, charge back the share of the cash for the months left in the term, on top of any prepayment penalty. If you plan to buy again, ask whether porting the mortgage avoids the clawback.

When can a cash-back mortgage make sense?

When you need cash soon after closing, expect to keep the mortgage for the full term, and the extra interest over the term is less than the cash. Compare the total cost both ways before you decide.

What happens when a temporary buydown ends?

Your rate goes up to the full contract rate and your payment rises with it, so budget for the higher payment from the start. At renewal, the buydown is gone and you pay the rates of the day.

Will a lower rate help me qualify for a bigger mortgage?

It can. The qualifying rate is your contract rate plus 2%, or 5.25% if that is higher, so a lower contract rate lowers it down to that floor. But an insurer may deduct a large builder incentive from the price, which can raise the down payment you need.

Weighing your mortgage options? Read about choosing a mortgage term and fixed or variable rates, or try my mortgage calculator.

This article is general information, not financial advice. The details come from FCAC, OSFI, CMHC, the Bank of Canada, Sagen, BCFSA, Business in Vancouver and the published terms of RBC, Libro Credit Union and TD, and were current at the time of writing; rates and offers change often, and your commitment and mortgage contract set your actual terms. For FCAC's guide, see choosing a mortgage.