(Optional) A logical value that specifies the way to calculate the total accrued interest when the date of settlement is later than the date of first_interest. If calc_method is omitted, it is assumed to be TRUE. - If calc_method evaluates to TRUE or is omitted, ACCRINT returns the total accrued interest from issue to settlement. - If calc_method evaluates to FALSE, ACCRINT returns the accrued interest from first_interest to settlement.
calc_method