APR

Annual Percentage Rate (APR) is the true annual cost of borrowing money, expressed as a yearly percentage. Unlike the nominal interest rate (which covers only the interest charged on the principal), APR includes all mandatory costs of the loan — processing fees, administrative charges, insurance premiums required by the lender, and other mandatory expenses — spread over the loan tenure.

APR enables borrowers to make an accurate, apples-to-apples comparison between different loan offers. A loan with a lower interest rate but high fees may have a higher APR — and therefore be more expensive — than a loan with a slightly higher interest rate but fewer fees.

In India, the Reserve Bank of India requires all regulated lenders to disclose the annualised interest rate (which is effectively the APR concept), but the term APR itself is used interchangeably with "effective interest rate" or "annualised cost of credit."

APR = [(Total Interest + Total Fees) / Principal / Tenure in years] × 100

A more precise formula that accounts for compounding:

APR ≈ 2 × n × F / (P × (N + 1))

Where n = number of payment periods per year, F = total finance charges, P = principal, N = total number of payments.

For complex loan structures, APR is best calculated using the IRR of all cash flows (disbursement as positive, all repayments including fees as negatives).

You take a personal loan of ₹5,00,000 at a stated interest rate of 12% per annum for 3 years (36 months).

• Monthly EMI = ₹16,607
• Processing fee = 2% = ₹10,000 (deducted upfront; net disbursement = ₹4,90,000)

The actual cash flows are: receive ₹4,90,000, pay ₹16,607 for 36 months.

Using IRR on these cash flows gives an effective monthly rate of approximately 1.09%, which annualises to APR ≈ 13.1% — not the advertised 12%.

Use the APR calculator to compute the true cost of any loan.

• Compare APR, not interest rate: When comparing home loans, personal loans, or car loans from multiple lenders, always compare APR (or the stated effective annual rate) — not the nominal interest rate.
• Reducing balance vs flat rate: Banks in India calculate EMI interest on a reducing balance basis. Some finance companies use a flat rate, which results in a much higher effective APR. A 10% flat rate is equivalent to approximately 18–19% APR on a reducing balance.
• Amortisation and APR: In a fully amortising loan, the APR equals the IRR of the cash flows when all fees are correctly accounted for in the disbursement amount.
• Credit card APR: Credit cards in India charge 3–4% per month on revolving balances, which annualises to 36–48% APR — among the most expensive forms of credit. Pay the full balance every month.
• Prepayment and APR: If you prepay a loan, the effective APR increases because the upfront fees (processing charge) are amortised over a shorter period. Factor this into your prepayment decision.