When you compare auto loan offers in Texas, compare APR to APR. The Consumer Financial Protection Bureau (CFPB) says a loan's interest rate is the cost of borrowing the money, while the Annual Percentage Rate (APR) adds the interest rate and the lender's fees, such as origination charges. Federal law requires lenders to show you the APR before you finalize the loan, so it's the fairest number for comparing offers side by side.
The CFPB's explainer on the difference between a loan interest rate and the APR (last reviewed Aug. 28, 2026) defines them this way:
The CFPB's auto loan key terms page adds that the interest rate does not include loan fees, and that the higher the APR, the more you'll pay over the life of the loan.
Under the federal Truth in Lending Act (TILA), lenders have to give you specific disclosures, including the APR, before you're legally obligated on the loan. Because every lender has to show an APR, the CFPB says you can use it to compare auto loans. The CFPB also warns: don't compare one lender's APR to another lender's interest rate. They aren't the same measure.
A hypothetical example (for illustration only, not a real quote): Offer A advertises a lower interest rate but adds a loan fee. Offer B has a slightly higher rate and no fee. Once the fee is folded in, Offer A's APR could land above Offer B's. You'd miss that if you only compared interest rates.
A lower APR helps, but it doesn't settle the decision on its own. The CFPB key-terms page also points out:
So line up offers with the same term and the same amount financed. Then compare APR, monthly payment, and total of payments together.
The CFPB notes that higher credit scores generally get lower rates, and that dealers and lenders are not required to offer you the best available rates. Its advice is to shop around and compare rates from different lenders.
The CFPB also defines a buy rate as the interest rate a lender quotes to your dealer when you apply for dealer-arranged financing. You don't need to know a buy rate to protect yourself. You do need to compare the APR on each final disclosure you're offered.
Before you sit down to talk numbers:
This is general education based on CFPB guidance, not legal or financial advice. Your offers depend on your credit, the vehicle, and the lender.
A low advertised rate is only part of what a loan costs. The APR includes lender fees, so it's the number to compare, as long as the term and amount financed are the same across offers. Shop more than one offer and read the disclosure before you sign.