A balanced trial balance only proves the arithmetic. To prove a migration you must also match the old books, ageing and stock. Here is a three-layer method.
Why the Trial Balance Is the Proof
Every transaction in a double-entry system has equal debit and credit, so the trial balance always totals the same on both sides. That only proves the arithmetic. What you need after a migration is proof that the numbers equal the old books. So the check has two layers: internal balance, then agreement with the source.
Layer 1: Does It Balance?
Open the trial balance as of the cut-over date. Total debit must equal total credit. If not, a one-sided entry was imported. The most common cause is opening balances loaded without an offsetting account. A well-designed importer uses a temporary opening account and shows it at zero when everything is allocated.
Layer 2: Does It Match the Old Books?
| Check | Compare with | Typical cause of a difference |
|---|---|---|
| Group totals | Old trial balance by group | A ledger mapped to the wrong group |
| Each bank account | Bank book and statement | Cheques issued but not cleared at cut-over |
| Receivables by party | Old outstanding list | Duplicate or merged parties, advance receipts not allocated |
| Payables by party | Old outstanding list | Credit notes missing from bill-wise dues |
| Stock value | Old stock summary | Different valuation method or missing opening rate |
| Tax accounts | Old duties and taxes ledgers | GST balances split or merged differently |
Layer 3: Ageing and Stock
Run receivable and payable ageing and compare bucket totals with the old outstanding statement. Then run the stock balance report and compare quantity and value per item for your top twenty items. A difference of a few rupees from rounding is fine; a systematic difference is a mapping problem.
Write Down Every Difference
Keep a one-page reconciliation: each difference, its cause, who fixed it and the date. Accountants and auditors appreciate it and it prevents the same question being asked again at year end.
Do not post new vouchers until it matches. Fixing a mapping error is easy before transactions exist and painful after.
Then Run in Parallel
During the first month compare the trial balance weekly. If you are moving from Tally, our Tally migration guide covers the data side and the go-live checklist covers the rest. The NexoraERP accounting module provides the Trial Balance, ageing and stock reports used above.
Accounting and GST ERPTally to ERP migrationData migration checklistERP reports and KPIs
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