A method for allocating financial statement values across multiple accounts using precise values is provided. The method creates an n.times.m array of rounded allocation values, which are appropriately scaled according to share values for each account. According to one embodiment of the present invention, the method generates rounded allocation values by working across a given line item, account by account, then to a next line item. The method first calculates a relative portion of a respective line item value to be apportioned to accounts 1 to j for a given account j. The method then rounds the calculated portion according to a predetermined degree of precision. Finally, the method calculates a portion applicable to account j as a difference between the calculated portion and a portion calculated for a previous account j-1. The method repeats these steps for each account from a first account to a last account, then each line items from the first line item to the last line item in the financial statement.