What is accounting data migration?

Accounting data migration is moving a company's financial records from one system to another: the chart of accounts, opening balances, transaction history, customers and suppliers, open invoices and bills, fixed assets and tax settings. It is the hardest part of changing accounting software and the main reason companies delay it.

Definition

Mapping and validationHardest part

Period start after a closed yearTypical cut-over

ERP and general ledgerCategory

The work is mapping and validation rather than copying. Accounts are mapped to the new chart, history is either loaded in detail or brought in as opening balances at a cut-over date, and every balance is reconciled to the old system before go-live. Migrations fail on dirty master data, unreconciled sub-ledgers and undocumented customisations. Vendors and their partners offer migration services; the AI-native ERPs sell fast migration from QuickBooks and NetSuite as a feature.

Common questions

How long does an accounting data migration take?+

Weeks for a small business moving between cloud ledgers; three to nine months for a mid-market ERP with subledgers, customisations and several entities.

How do you validate a migrated ledger?+

Reconcile the trial balance, aged receivables and payables, bank balances and fixed asset registers in the new system to the old at the cut-over date, then run the first close in parallel.

Should you migrate full history or opening balances?+

Most migrations bring two to three years of detail and opening balances before that. Full history is expensive to clean; opening balances alone lose drill-down.