Bookkeeping · Reconciliation & Close · Brief · Working level
Opening balance problems: where they come from and the clean-start fix
Wrong opening balances poison every reconciliation after them. The four common sources, how to diagnose which one you have, and the clean-start procedure that fixes it.
Every reconciliation stands on the one before it: this month's opening balance is last month's proven closing balance. When the opening balance is wrong, every reconciliation after it inherits the error — you can tick every transaction perfectly and still end each month off by the same stubborn amount. The repair is rarely archaeology; it is usually a clean start from a date you can prove.
Where wrong opening balances come from
The four usual suspects and their fingerprints:
| Source | How it happens | Fingerprint |
|---|---|---|
| Setup from memory | Account created with a guessed balance, no statement | Books never reconciled cleanly, from day one |
| Bank-feed overlap | Feed imports transactions predating the entered opening balance | Difference equals specific early transactions, doubled |
| Edited history | A reconciled transaction changed or deleted later | Reconciliations were clean, then a past month "broke" retroactively |
| Missing accountant entries | Year-end adjusting entries never posted back | Books disagree with the return; equity and depreciation off |
The third is the most common in practice and the reason locking closed periods exists; the fourth is the post-back failure described in year-end close vs. monthly. To identify which you have, find the last month that reconciled cleanly — binary-search the history if needed — and examine what changed immediately after.
The clean-start fix
- Choose the clean-start date: a statement closing date, ideally the most recent month-end (or year-end, if the accountant will bless it).
- Get the certified number: the bank statement balance on that date, adjusted for genuinely outstanding items you can list by name.
- Compute the gap between that true balance and the ledger's balance on the same date.
- Post one adjustment dated the clean-start date, with a memo showing the whole calculation.
- Lock everything on and before that date, and reconcile normally from the next day forward.
| Account | Debit | Credit |
|---|---|---|
| Cash | 412.00 | |
| Opening balance adjustments (equity) | 412.00 |
Direction depends on which way the books are off. Route the offset through an equity account your accountant approves — not miscellaneous income or expense, where it would distort the P&L and potentially the return.
The offset account matters. The gap is accumulated history, not a current-period profit or loss; parking it in equity keeps this year's income statement honest while the accountant decides at year-end whether any of it has tax character. If a return has already been filed on the broken numbers, stop and involve the accountant before posting anything — books must keep matching filed returns, and record-retention rules in Publication 583 mean the broken history gets preserved, not overwritten.
Preventing the relapse
The clean start only holds if the causes stop: lock periods after every close, set the bank feed's start date to the day after the opening balance, and post the accountant's entries back every year. Do those three and the opening balance becomes what it should always have been — the one number in the reconciliation you never think about.
Frequently asked questions
- Why is my ledger's opening balance wrong?
- Four usual sources: the account was set up from memory instead of a statement; a bank feed imported transactions that predate the opening balance, double-counting them; someone edited or deleted a transaction in a prior reconciled period; or an accountant's adjusting entries were never posted back. Each leaves a different fingerprint in the reconciliation history.
- How do I fix a wrong opening balance?
- Pick a clean-start date — a statement date, ideally a month- or year-end — and post one adjustment dated that day so the ledger balance equals the statement balance exactly. Route the offset through equity (or per your accountant's instruction), document the calculation, lock the prior period, and reconcile normally from there forward.
- Should I re-do old reconciliations after fixing an opening balance?
- Only if the misstated months feed a tax return that has not yet been filed, or a lender needs restated figures. Otherwise, the clean start deliberately trades perfect history for a provably correct present — re-litigating a year of broken months usually costs more than the information is worth. Ask your accountant before restating anything filed.