The actual interest rate of installment repayment is equal to the interest to be repaid divided by the principal and then divided by the number of years.

For example, to pay back the interest of 3000 yuan, the principal for two years is 1 * *, so the annual interest rate is 15%.

The loan interest rate of formal lending institutions is generally within the scope permitted by law, and the general annualized interest rate is within 24%, and the maximum interest rate cannot exceed 36%. If it exceeds 36%, that is; The calculation method of annualized interest rate is also simple. Divide one year's interest by the principal, daily interest multiplied by 365 days is the annual interest, and monthly interest multiplied by 12 is the annual interest.

Extended data:

The real interest rate method uses the real interest rate to amortize the excess and discount, and the amortization amount of the actual excess and discount is squeezed out backwards. The calculation method is as follows:

1, the interest expense calculated at the actual interest rate = the actual interest rate of the initial bond purchase price.

2. Interest calculated at face value = face value coupon rate.

3. When issuing the premium, the amortization amount of the current premium = interest calculated at the actual interest rate-interest expense calculated at face value.

4. In the case of discount, the amortization amount discounted in the current period = interest expense calculated at face value-interest calculated at intensity interest rate.