Rebuild Records When Old Software Data Is Unavailable
If your old bookkeeping system no longer provides the data, start by checking backups, exports and access options before rebuilding anything. Missing software access does not necessarily mean all records are gone. Banks, vendors, customers and payment systems may still hold parts of the transaction history.
Inventory what can still be recovered
Look for saved financial reports, general ledger exports, reconciliation reports, invoices and statement files. Ask the former provider or authorized account owner about archival access and backup availability. Record which periods are covered and where gaps remain. A folder of bank statements is useful, but it will not necessarily show invoice applications, business purpose or noncash accounting entries.
Reconstruct from independent records
Use bank and card statements alongside invoices, receipts, lender statements and processor detail. Build from the last reliable balance and reconcile each affected period in sequence. Avoid treating every deposit as a sale or every withdrawal as an expense. Record the source of each reconstructed item and maintain a list of anything that remains uncertain.
Protect the recovered history
Save accessible exports in addition to any restored software file. Retain the documents supporting tax returns and financial reports under the applicable recordkeeping requirements. If past returns were based on records that cannot be recovered or now appear inaccurate, discuss the issue with the tax preparer. The repair plan should reflect the available evidence and scope of the gaps, rather than promise a complete reconstruction before reviewing what survives.