Connecting your POS to TallyPrime: a practical guide
How the TallyPrime POST API works, what should and should not sync, and how to get your CA to sign off in a week.
Published 2026-06-24 · Aero Pack POS, Delhi NCR
Why the CA is the real decision maker
Shopkeepers choose the POS; accountants veto it. If the day's sales do not land in Tally cleanly, your CA will ask you to go back to the old system, and you will.
How the connection works
TallyPrime exposes an HTTP/POST API. Your POS posts XML or JSON vouchers to the machine running Tally, on the local network or through a secure tunnel. There is no file export, no copy-paste, no CSV.
Map the ledgers once
Sales by tax rate, output CGST/SGST/IGST, cash, card, UPI, wallet, discount, rounding and party groups. Get this right in the first week and you will never touch it again.
Decide consolidated or bill-wise
Most retail counters post one consolidated daily voucher; B2B-heavy businesses post bill-wise so party ledgers stay accurate. Ask your CA which they want before you configure it.
Run in parallel for one week
Keep doing whatever you do today, and let the sync run alongside. At the end of the week compare the trial balance. When it matches twice in a row, switch the manual process off.
Every quote is written for your counter: the configuration, the quantity and the installation are all part of the number. Send us what you sell on WhatsApp and you will have a firm, itemised quote with a GST invoice — usually the same day.
Ready to see it on your own counter?
An engineer visits with a machine, loads your items and bills a live transaction. Thirty minutes, free, no obligation.