Our new accounting system duplicated last year's bank activity. Where should we start the correction?
Duplicate Bank Feeds After a Software Migration. A specific owner scenario, the facts that change the answer, and the records needed for a tax review.
By AE Tax Advisors Team · Updated October 28, 2026
Freeze the affected import and reconcile the migration before changing tax accounts. Duplicate feed entries can affect multiple periods and need a transaction-level correction rather than one offsetting plug.
A specific business-owner situation
A company migrates bookkeeping software and imports historical activity already included in opening balances. Revenue and expenses now appear twice. The original ledger, opening entries and feed dates should establish which records are duplicated.
Illustrative example, not a client result.
What to establish before filing
- Preserve both systems and stop duplicate imports.
- Match opening balances to detailed transaction history.
- Determine whether incorrect figures reached any filed return.
Which fact changes the answer?
A duplicated transaction differs from an opening balance carrying an unresolved payment. Reconcile bank and account balances before using date alone to decide which entries survive.
A mistake to avoid
Deleting every old-dated entry can remove legitimate outstanding items along with duplicates.
Records that support the decision
- Old-system export.
- Migration settings.
- Opening trial balance.
- Bank reconciliations and returns.
The decision to document
Ask for an account-by-account migration reconciliation and correction log. Confirm the tax preparer receives the corrected ledger and any explanation of previously filed figures.
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Related questions
- How do I reconcile calendar-year W-2 totals to my company's fiscal-year tax return?
- Can we write an old payment-clearing balance to miscellaneous expense to finish the tax return?
Sources and editorial context
General educational information prepared with AI assistance. No individual professional review is claimed. Apply the relevant tax-year rules to the actual records. Editorial policy · AI disclosure.