How do I catch up on bookkeeping that is months behind?

A step-by-step catch-up plan:

1. Pick the start date, usually the first day of your financial year or the last month you know is right.
2. Gather statements for every business account, plus sales reports from payment apps and online marketplaces.
3. Enter one month at a time, starting with the earliest. Statements are your list of what happened; receipts back up the details.
4. Find missing receipts. Check email confirmations and vendor accounts. Note any expense where you only have the statement line.
5. Reconcile each month before moving on, so errors do not carry forward.
6. Mark personal items as owner draw, not expenses.
7. List unpaid invoices and chase them.
8. Check tax deadlines you may have missed. For the 2026 tax year, the 4th estimated payment is due January 15, 2027 and Schedule C returns April 15, 2027.

Then set a weekly 15-minute slot so it does not happen again. If you are a year or more behind, a bookkeeper may quote the work as a separate catch-up project. General information, not tax advice.