Use tax preparation software instead of bookkeeping software when the assigned outcome is a calculated, reviewed, authorized, and filed tax return. Bookkeeping software organizes routine transactions and reconciliations; it does not normally model tax forms, elections, carryovers, diagnostics, signatures, electronic transmission, or acceptance states.
This is not permission to skip bookkeeping. Tax preparation is most reliable when it begins with a reconciled bookkeeping package and sends approved outcomes back to future records. The decision boundary therefore depends on the work product, specialized tax logic, filing obligations, and completion evidence—not on whether a bookkeeping application displays tax categories or year-end reports.