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Rates & InterestAPRLetter A

Annual Percentage Rate (APR)

The true annualized cost of borrowing, reflecting the nominal interest rate plus lender origination fees, points, and closing costs.

Overview & Practical Application

The Annual Percentage Rate (APR) provides a standardized, complete annualized measurement of the cost of credit. While the nominal interest rate only reflects the interest charged on the principal balance, the APR bundles the interest rate together with all mandatory prepaid finance charges, loan origination fees, discount points, underwriting costs, and processing fees.

Under the federal Truth in Lending Act (TILA) and Consumer Financial Protection Bureau (CFPB) regulations, all lenders are legally required to disclose the APR prominently on Loan Estimates (LE) and Closing Disclosures (CD).

Comparing APRs across competing lenders allows borrowers to evaluate loans on an apples-to-apples basis, ensuring that an apparently low interest rate is not offset by inflated upfront lender fees.

Fixed-Rate vs. 5/1 Adjustable-Rate Mortgage (ARM)Fixed (6.5%)ARM (Variable)Year 0Year 5 (Reset)Year 10Year 30ARM offers lower initial payments for 5 years, then exposes borrower to market rate fluctuations.
Visual Infographic: Annual Percentage Rate (APR)

Mathematical Formula & Calculation

APR = [ ((Total Fees + Total Interest) / Principal) / Loan Term in Days ] * 365 * 100

Calculates the total finance charge per dollar borrowed, annualized over the loan tenure.

Variable Definitions:

  • Total Fees=All mandatory prepaid finance charges, origination points, and underwriting fees
  • Total Interest=Cumulative interest charged over the full amortization term
  • Principal=The base loan amount borrowed
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Test real-world numbers and see instant underwriting results.

Nominal Note Rate6.250%
Effective True APR6.402%
ℹī¸ True APR reflects the cost of borrowing including $4,500 in upfront fees over 30 years.

Real-World Underwriting Example

Scenario: Lender A offers a $300,000 30-year mortgage at 6.00% interest with $6,000 in upfront origination fees. Lender B offers 6.25% interest with $0 in fees.

Calculation:
Lender A Nominal Rate: 6.00% | APR: 6.22%
Lender B Nominal Rate: 6.25% | APR: 6.25%

Takeaway: If you plan to stay in the home for the full 30 years, Lender A with the lower APR is cheaper. If you plan to sell or refinance in 3 years, Lender B may save you money by avoiding upfront fees.

Key Underwriting Takeaways

  • APR is almost always higher than the nominal interest rate because it incorporates upfront lender fees.
  • APR assumes you keep the loan for the entire term; early refinancing or selling alters the effective cost.
  • Fixed-rate APR differs from adjustable-rate APR, which projects composite introductory and index margins.
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Mortgages

Amortization

The mathematical scheduling of equal periodic loan payments that systematically reduce both interest and outstanding principal over time.

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Mortgages

Closing Costs

The processing, legal, title, appraisal, and governmental fees paid by buyers and sellers at the formal closing of a real estate transaction.

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