Abstract: Modular computerized tax return preparation systems that allow tax data determinations to be performed when the user indicates that tax data will not be entered, which may be for various reasons including the user declining to provide personal information (such as a social security number or other personal identification information), not knowing the requested data, or not having the requested data readily available. A user interface controller presents an interview screen requesting data tax return data and the user responds that the requested data applies to the user but is not being entered or will be entered at a later time. A placeholder is generated or selected for interim use until the requested data is provided by the user, and when provided, tax data determinations and calculations can be repeated as necessary if the provided data differs from the placeholder.