Migrations fail on expectations rather than on technology. So, plainly: ledgers, groups, stock items, opening balances and Day Book vouchers come across. Historical sales do not arrive as itemised GST invoices — they arrive as balanced journals with exact totals, and the line detail stays in your Tally file.
Your chart of accounts comes across with its group structure rather than as a flat list, so the trial balance reads the way you are used to.
Items with their units, opening quantities and rates, including alternate units where you use them.
Party-wise and account-wise, reconciled against your Tally trial balance before anything else is imported.
Historical vouchers as balanced journals with exact totals, so the ledger history and the period figures are right.
The import is previewed and reconciled against your Tally figures before it is committed, rather than committed and then checked.
The onboarding team does the first import alongside you. This is the step where a migration is either done properly or done twice.
No — historical vouchers arrive as balanced journals with exact totals rather than as itemised GST invoices with lines, HSN codes and tax splits. The period figures and the party ledgers are correct; the line detail stays in Tally, which is why most businesses keep the old file as an archive.
They should, and the import is reconciled against your Tally trial balance before anything else is brought in. If they do not tie at that point, nothing further is imported until they do.
Yes, and for a month it is a sensible thing to do. Enter in both, compare the trial balance at month end, and switch when you are satisfied rather than on a date somebody picked.
A financial year boundary, almost always. It makes the opening balances clean, the comparatives meaningful and the numbering straightforward.
Start free, bring your ledgers and balances across, and reconcile against your Tally trial balance.