Mortgage Math
APR vs Interest Rate - What's the Difference?
The interest rate is the cost of borrowing principal. The APR rolls in lender fees and finance charges to express the all-in annualized cost. Here is how to use both correctly when shopping.
Rate vs APR Side by Side
| Aspect | Interest rate | APR |
|---|---|---|
| What it measures | Cost of borrowing principal | Cost of principal + finance charges |
| Drives your monthly P&I | Yes | No |
| Includes lender fees | No | Yes |
| Includes discount points | No (but points buy the rate down) | Yes |
| Useful for | Knowing your payment | Comparing total cost across lenders |
Compare rate AND APR live
The pricer below shows both rate and APR for hundreds of lenders on your exact scenario.
Conventional Loan Facts
- Down payment as low as 3% for first-time homebuyers, 5% for others
- Down payment assistance programs available to fully cover the 3% down payment
- Private Mortgage Insurance (PMI) required below 80% LTV - automatically removed at 78%
- Maximum DTI typically 45%, up to 50% with strong compensating factors
- Minimum credit score generally 620; best rates at 740+
- Available for primary residence, second home, or investment property
- No upfront mortgage insurance premium - only monthly PMI if applicable
Frequently Asked Questions
What is the difference between APR and interest rate on a mortgage?+
The interest rate is the cost of borrowing the principal - it determines your monthly P&I. APR (Annual Percentage Rate) is a broader figure required by federal Truth-in-Lending law: it converts the rate PLUS finance charges (origination fees, points, MI, etc.) into a single annualized rate. APR is always equal to or higher than the interest rate.
Which is more important: APR or interest rate?+
Both - for different reasons. The interest rate drives your monthly payment. The APR captures the total cost over time. When comparing two mortgage offers, the lower APR generally means lower total cost if you keep the loan its full term. But on short-term-hold scenarios, the rate matters more than APR.
Why is the APR usually higher than the rate?+
Because APR rolls in the finance charges - lender fees, discount points, and certain prepaid interest items - amortized over the loan term. The interest rate excludes those charges. The bigger the upfront fees, the bigger the spread between rate and APR.
Can lenders manipulate APR?+
APR is regulated - lenders must include the same defined finance charges. But lenders can manipulate the comparison by using non-comparable lock periods (a 15-day quote APR vs a 60-day quote APR is misleading), shifting fees between lender fees and third-party fees, or quoting different points levels. Always compare on apples-to-apples scenarios.
How does Rate Direct help me compare APR fairly?+
The live pricer above shows both rate and APR for each lender on the SAME scenario - same loan amount, same lock period, same product, same FICO. You see the structural comparison directly without lender games.
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