Is That Mortgage Cash Back Really a Deal? Let's Do the Math
Let's talk about cash-back mortgages for a minute.
You've seen the offers. A big bank dangles a couple thousand dollars, calls it a "limited-time" deal (for the fifth time this year), and suddenly that cheque is all anyone can think about. I get it. Free money feels good. But after years of sitting across the table and really listening to clients, I can tell you the cash is rarely the whole story.
Cash back isn't free. It's baked into your rate. And sometimes the effective rate on that shiny offer is no better than a plain, lower rate somewhere else.
A real example
Say you're borrowing $500,000 over 25 years at 4.74% on a 5-year term, and the lender hands you $2,000 cash back. That's 0.40% of your mortgage, and your payment works out to about $2,834 a month.
So what's that $2,000 actually worth? Using the new Cash-Back Mortgage Calculator from Mortgage Logic News, the equivalent no-cash-back rate is 4.64%. In plain English: a lender offering 4.64% with no cash back is basically a tie. Anything lower, and you're ahead skipping the rebate.
And the term changes everything:
Term | Equivalent rate (no cash back) | Worth vs. 4.74% |
1 year | 4.32% | 0.42% |
2 years | 4.52% | 0.22% |
3 years | 4.59% | 0.15% |
4 years | 4.62% | 0.12% |
5 years | 4.64% | 0.10% |
See how fast it shrinks? On a one-year term, that $2,000 is worth almost half a point. Spread over five years, it's worth a tenth. Same cheque, very different deal.
Why this calculator is different
There are lots of "equivalent rate" calculators out there, and MLN points out that many take shortcuts, like dividing the cash-back percentage by the term, or adding up payment differences and declaring a winner. Those can steer you wrong.
This one treats the cash back as a prepayment right after your first payment, keeps your monthly payment the same either way, then finds the rate that leaves you owing the same balance at the end of the term. No guessing about what you'd do with the money. Just a fair, side-by-side comparison.
The part nobody mentions: penalties
Cash-back offers often come from big banks, and big bank penalties for breaking a fixed mortgage early (the interest rate differential, or IRD) can sting. Life happens: moves, separations, refinances. Some lenders will also want part of that cash back returned if you break early. A $2,000 rebate disappears fast next to a five-figure penalty.
So should you take the cash?
Maybe! Sometimes it really is the better deal, especially on shorter terms or when you need help with closing costs. I just want you choosing it because you know what it costs, not because it looked nice in an ad.
Weighing an offer? Send it my way. I'll run the numbers, print you the comparison and we'll talk it through. No pressure, no hype. Just math and a good listen.
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