How to Catch Up on Months of Bookkeeping Before Tax Season
Find the last month your books were reconciled to the bank, gather every statement since then, and rebuild one month at a time, oldest first: record and categorize every transaction, reconcile each account to its statement, then true up payroll, sales tax and loans before you move on. Work back from your deadline. S corporation and partnership returns are due March 15, C corporation and individual returns April 15, and your tax preparer needs the finished books before then.
How do I know how far behind my books are?
Find the last month that was reconciled, not just entered. A month is caught up when every bank, card and loan account in the books matches its statement for that month. Everything after that point is behind, even if the transactions were imported from the bank feed.
Signs your books are behind:
- Uncategorized transactions or a large "Ask my accountant" balance.
- The bank balance in your books does not match the bank statement.
- Accounts that have never been reconciled, or months with no entries.
- Personal and business spending mixed in the same accounts.
- You can't say whether last year was profitable.
What do I need to gather before I start?
Collect everything first, so the rebuild doesn't stop halfway through a month:
- Bank and credit card statements for every month behind.
- Loan and line-of-credit statements, showing principal and interest.
- Payroll reports for the same months.
- Payment processor and marketplace reports, such as Stripe, Square, Shopify or Amazon.
- Bills and receipts for larger purchases, and records of any equipment or vehicles bought or sold.
- W-9s and payment totals for contractors.
- Sales-tax filings, if you collect sales tax.
- Your last filed tax return, and access to QuickBooks or Xero if you use them.
Most banks let you download past statements from online banking. For older months, request them early: they can take a while to arrive.
In what order should I catch up the books?
Oldest month first, one month at a time, because each month's closing balances are the next month's opening balances:
- Set the starting point. Confirm opening balances from the last reconciled month or your last filed return.
- Record every transaction. Work from the statements, not memory, and categorize each one. Leave nothing uncategorized.
- Reconcile every account. Each bank, card and loan account must match its statement before you move to the next month.
- True up payroll, sales tax and loans. Match payroll to the payroll reports, sales tax to what was filed, and split loan payments into principal and interest.
- Separate personal and business. Record owner draws and contributions instead of mixing them into expenses.
- Review the balance sheet. Anything that doesn't tie gets fixed, and every correction is documented, not buried.
- Close and lock each month. Then start the next one.
The routine that keeps each month closed afterwards is in The Month-End Close Checklist. If you are not sure which method your books should use, see Cash vs Accrual Accounting.
How do I plan the catch-up around tax season?
Work back from your return's due date. For a calendar-year company, a realistic plan looks like this:
| When | What to have done |
|---|---|
| Now, in the fourth quarter | Find where the books stop, request missing statements and start the oldest months |
| December | Caught up through November; contractor payments and W-9s complete |
| January 31 | W-2s and 1099-NEC forms sent |
| February | December closed, the year locked and the package handed to your tax preparer |
| March 15 / April 15 | S corporation and partnership returns, then C corporation and individual returns, filed or extended |
If a due date falls on a weekend or legal holiday, it moves to the next business day. This guide is general information, not tax advice.
Catch up contractor payments early: the 1099-NEC deadline comes before the returns. See Who Needs a 1099-NEC, and What Changes for 2026 Payments?
What if I can't catch up before the deadline?
File an extension rather than a return built on books you know are wrong. An extension gives you more time to file, not more time to pay: tax owed is still due by the original deadline, and interest and penalties can apply to anything paid late. Estimate what you owe from the months you have caught up, pay it by the original date, and finish the books before the extended deadline.
Can I catch up my books myself?
If you are only a few months behind, with one business and a modest number of transactions, yes: follow the order above and reconcile every month. Outside help usually pays for itself when you are more than a few months behind, several LLCs share one bank account, payroll or sales tax is involved, or a lender is waiting for financial statements.
How do I stay caught up afterwards?
Close the books every month on a fixed calendar: reconcile every account, review the balance sheet and lock the month. A month takes hours to close when it is current and days when it has piled up with eleven others.
How does Korven catch up books?
At Korven, a senior specialist rebuilds your books in QuickBooks Online or Xero, inside your existing setup: transactions reconstructed, every account reconciled to the bank, payroll, sales tax and loans trued up, and errors documented rather than buried. Several LLCs sharing one account are separated entity by entity. You get a tax-ready package and lender-ready statements, then a clean cut-over to monthly books so you don't fall behind again. Korven prepares your books and tax file; our licensed CPA partner prepares, signs and files your return.
How pricing works. Catch-up is one fixed price for the whole job, set by how many months are behind, your transaction volume and how messy the records are, with a timeline. It is confirmed in writing after a free review, before any work starts. Never hourly.
The Korven Guarantee. Measurable improvement in 30 days, or we keep working. Free.
See Months Behind? One Flat Price to Catch Up and How Do I Prepare My Small Business for Tax Season?
What else do people ask about catching up on bookkeeping?
How far back can catch-up bookkeeping go?+
Should I catch up the oldest month first?+
Can I file my taxes without catching up the books?+
What if my LLCs share one bank account?+
How does Korven price catch-up bookkeeping?+
Books rebuilt and reconciled until a lender or the IRS can read them, with a timeline in your quote.
Read more →The documents and deadlines once the books are caught up.
Read more →The monthly close that keeps you from falling behind again.
Read more →Get your Free Finance Review. We look at where your books stand, give you the three biggest problems in writing, and a fixed quote with a timeline if you want our help. No obligation.
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