Abstract: A pocket-sized checkbook adapted to a register-type checkbook cover for simultaneously recording a checking transaction automatically while a check is being written. A plurality of vertically-offset, overlapping checks are removably attached to a checkbook having a back flap adapted for insertion into a pocket of a register-type checkbook cover. A record sheet is also removably attached to the checkbook for insertion beneath the particular check being written and on top of the remaining unused checks. The record sheet has vertically arranged spaces disposed beneath and corresponding to selected spaces on the face of the checks for duplicating certain information written thereon and computing a balance. A pressure sensitive medium associated with the checks and record sheet transfers the information written on the check to the record sheet, while a separate memo portion of the record sheet may be provided for recording additional information.