Accruals are used in accounting to report either future benefits or future liabilities. In accounting accrued interests are generally computed and recorded at the end of a specific accounting period as adjusting journal entries used in accrual-based accounting. In finance, accrued interest is the interest on a bond or loan that has accumulated since the principal investment, or since the previous coupon payment if there has been one already.
Negative Accrued Interest Amount on Bonds; In a normal situation, e.g. when you buy a bond in May you will receive the full interest on 30/06. However since you bought that bond only in May the seller also has a right for a part of the total interest, being the time that he was the owner of the bond.