katrina2388

I can understand how this could happen. The interest on the loans each month is calculated daily. Lets say a 10k loan at 5% equals ~$1.37 interest on the loan every day. If on automated payments, the interest should be very predictable as you will make payments the same day each month. In this way the amount of interest would only vary by a day or two (not including reduced interest from the lower monthly balance)

On the other hand, if not on automated payments you could make the payment anytime before the due date. Say you pay on the 15th every month, thats an even 30 days or ~$41. Maybe you forget one month and don't remember until the 22nd. That adds an extra 7 days interest and your payment will reflect the extra $10 or so. The next month you return to paying on the 15th, but since you paid on the 22nd last time there is only 21 days of interest on your balance. Your payment would then show more allocated to principal and less to interest (than normal).

If this is not the case, I have noticed that Citibank (Student Loan Corporation) interest/principal amounts often seem random on one of my loans. I have not called to investigate, since it has been working in my favor (causing me to pay LESS interest) over the time it has been occurring.