The Integration
What actually changes between ServiceTitan and the book of record
The reassuring part first. ServiceTitan does not care very much which general ledger sits behind it. It still has no general ledger of its own, it still produces invoices, payments, adjustments, and bills, and it still moves them to the book of record in batches. Your technicians will not notice a thing. The dispatch board, the pricebook, the memberships, and the mobile app are all unchanged.
What changes is the mapping, and that is where the value and the risk both live.
Classes become dimensions
In QuickBooks you had one class field and one location field, and by the time a shop reaches this size those two fields are usually carrying four meanings between them. In Intacct, entity, location, department, and additional dimensions are separate, structured fields. Your ServiceTitan business units now map to real dimensions rather than to an overloaded class list. This is the single biggest reporting upgrade of the move, and it is the reason revenue by trade, by branch, and by business unit stops being a project and becomes a report.
The GL account mapping gets rebuilt, not copied
Every ServiceTitan payment type, invoice item category, business unit, and adjustment type has to point at something in Intacct. Copying your QuickBooks chart of accounts across is the most common shortcut and the most expensive mistake, because a QuickBooks chart in a multi-entity shop is usually bloated with accounts that only exist to compensate for the missing dimensions. Six revenue accounts that really mean six business units become one revenue account with a business unit dimension. Done right, the chart gets smaller and the reporting gets deeper.
The sub-ledger discipline is exactly the same
Intacct does not fix merchant fees. It does not fix batching. A card processor still funds you net of its fee, financing lenders such as GreenSky and Wisetack still fund on their own cycle net of a dealer fee, and membership deferred revenue still has to be recognized correctly. Every clearing account, every reconciliation habit, and every tie-out on our ServiceTitan month-end close checklist carries over unchanged. Shops that expect a new general ledger to fix the sub-ledgers find out in month one that it does not, and they have paid a great deal of money to learn it.