Interest rate vs APR: what is the difference?
The interest rate determines your monthly principal-and-interest payment. The APR expresses that rate together with the finance charges — discount points, the lender fee, prepaid interest — as a single annual percentage, so offers with different fee structures can be compared fairly. The APR is normally the higher of the two.
Why both numbers exist
A lender can advertise a very low rate and recover the difference through fees. Comparing rates alone would make that offer look best when it might cost you more. The APR exists precisely to make that comparison honest, which is why Regulation Z requires it to appear wherever a rate is advertised, at equal prominence.
A large gap between the rate and the APR on a quote is information: it is telling you the fees behind that rate are substantial.
What the APR includes, and what it does not
The APR captures the finance charges — discount points, the lender fee, prepaid interest. It does not capture every dollar you bring to closing. Appraisal, credit report, settlement and title charges are generally excluded from the finance charge, so they do not lift the APR even though you certainly pay them.
That is why the APR is a comparison tool rather than a complete picture of closing cost. For the full picture you want the Loan Estimate, which itemises everything.
Where APR is less useful
The APR calculation assumes you keep the loan for its full term. Most people do not — they sell or refinance years earlier. On a loan with high upfront costs, the APR spreads those costs across thirty years and understates what they cost you over the five you actually keep it.
So use the APR to compare offers, and use the break-even calculation to decide whether upfront costs suit your plans.
Sources
We would rather you checked than took our word for it.
Related
Are discount points worth buying?
A discount point is money paid at closing to lower your interest rate, typically costing one percent of the loan amount per point.
What are closing costs in North Carolina?
Closing costs are the fees paid to complete a home purchase, covering lender charges, third-party services like the appraisal and title work, government recording fees, and prepaid items such as the first year of insurance.