Fast Billing is where you raise GST tax invoices; your accounting is where the books live. Instead of keying every invoice twice, Fast Billing posts a confirmed invoice to Tally and other accounting tools as a sales voucher with GST — receipts as receipt vouchers, credit and debit notes as Cr/Dr notes, and approved supplier bills as purchase vouchers. Your accounting stays the book of record; Fast Billing feeds it so nothing is re-keyed.
The join between billing and the accounts is where re-keying and mismatches usually creep in. With the accounting sync there is nothing to re-key: the invoice raised once in Fast Billing posts to Tally and other accounting tools as the matching voucher, GST heads and all — and your accounting stays where the statutory books live.
Because the document is raised once and mapped once, each step feeds the next. There is no export-and-import cycle and no drift between the invoice register and the books.
Every link below moves a document from Fast Billing to your accounting as the matching voucher, so the invoice register and the accounts never drift apart.
Fast Billing owns the sale document. When you confirm a GST tax invoice, the accounting sync builds the matching sales voucher in Tally or your other accounting tool, and a receipt or note syncs the same way. The party, the amount and the CGST/SGST/IGST split carry across from the invoice you already raised — the accounts team never re-types a single line.
Tax is computed on the invoice from your tax configuration and the item and party tax maps — so CGST and SGST for an intra-state sale, or IGST for an inter-state one, are already split correctly before anything posts. At setup you map each head to its ledger, against your existing company. From then on the sales voucher carries those heads to the matching GST ledgers, so the party-wise GST position reconciles without a manual split.
When billing runs in one system and the accounts run in another, the gap between them is where errors live — an invoice typed twice, a GST head that doesn't tie out, a receipt nobody posted. With the accounting sync there is no gap: the document is raised once and posts to your accounting from there. Fast Billing stays the operational front-end where invoices, payments and follow-up live; your accounting stays the book of record, and both show the same amount and GST.
Confirmed tax invoices post as sales vouchers, carrying the taxable value and CGST/SGST/IGST straight from the invoice you raised in Fast Billing.
Customer payments recorded against invoices post as receipt vouchers with advance adjustment, so the outstanding position stays in step.
Credit notes on returns and debit notes for extra charges post as Cr/Dr notes, so the customer ledger is corrected without a manual journal.
Supplier bills, once approved, post as purchase vouchers — so payables and receivables both flow from one platform.
Both Tally ERP 9 and TallyPrime are supported, configured against your existing company — and the same approach feeds other accounting tools.
Fast Billing is the operational billing front-end, not a general-ledger replacement — your accounting keeps the statutory books, fed without re-keying.
In a 30-minute demo we'll raise a GST tax invoice, map the ledgers to your accounting, post it as a sales voucher and record the receipt — one entry, books aligned.
