 Other bureaus initiate automated clearing house (ACH) transactions from the client, and remit payment either electronically or in the form of paper checks against the bureau's holding account.Because finance transactions can be enormous (thousands to hundreds of thousands per pay period per client), bureaus often consider the interest earned ("float") on those amounts in the interim to be a substantial source of revenue.The interim is the period of time between when the funds are collected from the employer (client), and either when the paper checks are cashed, or when electronic payments (in the case of taxes) become due on their due dates.