Rate
Interest rate = payment driver
The interest rate determines your monthly principal + interest. A 6.5% rate on $300K over 30 years = ~$1,896/mo. Lower rate = lower monthly. That's the rate's ONE job.
APR vs Rate · the numbers that lie differently
Same rate.
Different cost.
Interest rate determines your payment. APR includes lender fees baked into a single rate-style number. Two loans quoted at 6.5% can have very different APRs — and that's where the truth lives.
· How to read both
Two numbers.
Different jobs.
APR
APR = total cost driver
APR (Annual Percentage Rate) takes the loan amount, adds lender fees + points, and recalculates as a rate equivalent. If APR is much higher than your rate, the lender is loading fees.
Compare
Always compare APR-to-APR
Two LEs both quote 6.5% rate. Lender A's APR: 6.55%. Lender B's APR: 6.85%. Lender A is the better deal. The 30-bps APR gap = thousands more in fees.
Caveat
APR doesn't include everything
APR includes most lender fees but not all. It excludes title, recording, prepaids, escrow setup. Compare APR + total cash to close for the full picture.
· Watch-outs
Four traps
in rate vs APR.
Pitfall 01
Comparing rate to APR.
Different metrics. Always rate-to-rate AND APR-to-APR. Some lenders quote rate; some highlight APR. Demand both.
Pitfall 02
Buying down the rate without running APR.
Discount points lower rate but raise APR. The break-even depends on how long you stay. Usually only worth it if you'll stay 5+ years.
Pitfall 03
Ignoring APR on adjustable-rate loans.
ARM APR includes assumed future rate increases. The number can look scary but more accurately reflects long-term cost than the teaser rate.
Pitfall 04
Trusting APR alone.
APR is the best single comparison number — but it doesn't include everything. Pull all 3 LEs into /tools/loan-compare for the line-by-line truth.
Rate sets payment.
APR sets cost.
Five minutes. We help you read 3 LEs side-by-side and see which loan actually saves money.