After 500+ migrations across Tally, Sage, MYOB, QuickBooks Desktop, Xero, QuickBooks Online and Zoho Books, certain mistakes come up again and again — almost always when a migration is done quickly, without a specialist, or without a validation step. Here are the seven we see most often.

1. Migrating Without a Pre-Migration Data Audit

Jumping straight into migration without first reviewing the source data for duplicates, incomplete records, or inconsistent naming (the same customer entered three different ways, for example) just carries the mess forward. A short audit before migration catches these issues while they're cheap to fix.

2. Copying the Old Chart of Accounts Exactly

Old systems accumulate accounts that made sense five years ago and don't anymore. Migrating without rationalising the Chart of Accounts means inheriting clutter — and reports in the new system that are just as hard to read as they were in the old one.

3. Ignoring Multi-Currency or Tax Rate Mismatches

Tax codes and currency settings don't always map one-to-one between platforms. A common error: GST/VAT rates applied to the wrong accounts after migration, which only gets noticed when the next tax return doesn't reconcile — by which point weeks of transactions may already carry the error.

4. Skipping the Test Migration

A test migration with a sample of data — checked thoroughly before the full migration runs — catches mapping errors early. Businesses that skip straight to a full migration sometimes discover a systemic error only after every transaction has already moved, which is far more expensive to fix.

5. No Reconciliation Report at the End

Without a formal reconciliation — old system balance vs. new system balance, account by account — there's no way to be confident the migration is actually accurate. "It looks right" is not the same as "it's verified correct."

6. Deleting or Disabling the Old System Too Soon

Even a well-executed migration should run in parallel with the old system for at least one reporting cycle. We've seen businesses lose access to historical data entirely because a Tally license lapsed or a desktop computer was retired before anyone confirmed every figure transferred correctly.

7. Treating Migration as Purely a Technical Task

The technical transfer of data is only half the job. Staff also need to be trained on the new platform's workflows — invoicing, bank reconciliation, reporting — or productivity drops in the weeks after go-live regardless of how clean the migrated data is.

Every one of these mistakes is avoidable with a structured process: audit, map, test, migrate, reconcile, train. Skipping any one step is where things go wrong.

This is the exact process we follow on every migration — which is why our standard deliverable includes a full reconciliation report and staff training, not just the data transfer.