I know the basics of the calculation. My questions is really about the timing. A client paid their scheduled bond payment on 5/16, two weeks prior to the scheduled due date of 6/1. I need to book an accrual for interest as of 6/30 based on the amount of interest per the amortization schedule. My question is does the accrual period begin from the last actual date of payment(5/16) or the scheduled accrual date of 6/1? Note: Calculation is based on 30/360. Thanks for any help! Also, please provide any FASB/GASB guidance if possible.