How to calculate full credit card penalty interest? Many people don’t know how to calculate overdue interest on credit cards. If you forget to repay for a few days, a week, a month, or three months, how is the interest calculated? How to calculate interest plus handling fee and overdue fee? 1. Full penalty interest: After the repayment deadline is exceeded, regardless of whether the credit card has made partial repayments that month, the card issuer will calculate interest on the cardholder based on the total consumption amount. If a cardholder spends 8,000 yuan on March 8, the bill received on April 7 will show that the "repayment amount for this period" is 8,000 yuan and the "minimum repayment amount" is 800 yuan. If the cardholder repays 800 yuan according to the minimum repayment amount on April 25, the repayment date, then the recurring interest in the next statement on May 7 will be: 8,000 yuan × 0.05% × 48 days ( March 8 - April 25) + 7,200 yuan × 0.05% × 12 days (April 25 - May 7) = 192 yuan + 43.2 yuan = 235.2 yuan. If you only repaid 7,999 yuan on the repayment date, which is 1 yuan less, then the recurring interest in the statement on May 7th is: 8,000 yuan × 0.05% × 48 days + 1 yuan × 0.05% × 12 Day=192.006 yuan. 2. Interest accrual on outstanding payments: If the cardholder makes partial repayment, the repayment portion can be interest-free, and the bank only calculates interest on the outstanding portion. The interest on the bill of 8,000 yuan that is underpaid is 0.03 yuan. The interest calculation on the unpaid part means that if the cardholder makes partial repayment, the repaid part can get interest-free treatment. The bank only calculates interest on the unpaid part. Interest is calculated based on the unpaid portion. The cardholder also consumed 8,000 yuan on March 8 and repaid 800 yuan according to the minimum repayment amount on April 25, the repayment date. The cardholder can enjoy the 800 yuan returned on this day. From the consumption date to the repayment date, the recurring interest on the bill on May 7 is: 7,200 yuan × 0.05% × 60 days (March 8-May 7) = 216 yuan, which is The full penalty interest can save 19.2 yuan. If you repay 7,999 yuan on April 25, and you pay 1 yuan less, then the recurring interest in the statement on May 7 is: 1 yuan × 0.05% × 60 days = 0.03 yuan, and the interest will be less than the full penalty The interest rate is significantly reduced, and you can pay 191.976 yuan less.