What to outsource, and what to keep
Outsource the volume: transaction coding, reconciliations, AP and AR processing, and the month-end checklist. It's repeatable, it's checkable, and it eats the most hours.
Keep the judgment: tax positions, revenue recognition calls, anything your auditors will question. Your controller or CPA firm should own those, with clean books underneath.
Payroll sits in the middle. Preparing it can be outsourced; approving and submitting it should stay with someone on your side.
