BahiFlow: how a chartered accountancy firm stopped chasing clients for invoices every GST deadline

BahiFlow's managing partner described the tenth to the twentieth of every month as "deadline week that lasts ten days". Articled assistants spent it messaging clients for invoices, receiving blurry photos at midnight, typing invoice details into accounting software, and then discovering on the last day that a client had forgotten half their purchases.

The firm had grown by word of mouth to hundreds of clients, mostly small traders and manufacturers. Each new client added more WhatsApp threads, more spreadsheets tracking who had sent what, and more late nights. Hiring more staff was not keeping up.

We spent the week before a GST deadline in the firm's office. The pattern was clear within a day. Collecting documents was the bottleneck, not preparing returns. Clients were not careless; they simply did not know what the firm needed each month, and a WhatsApp message sent at the wrong moment was easy to forget.

We also noticed the firm's unwritten knowledge: which clients always sent sales but forgot purchases, which ones needed a phone call rather than a message, and which filings each client needed. None of it was written down anywhere except in staff members' heads.

Most of the firm's clients were not going to learn a new app, so we designed two ways in. Clients who wanted structure got a simple Android app showing exactly what was due each month and a camera to capture it. Everyone else could keep using WhatsApp: documents sent to the firm's business number were filed automatically against the right client and month.

Automatic reminders did the chasing. A few days before each deadline, clients with missing documents got a polite, specific message in Gujarati or English — not "please send documents" but "we have your sales invoices for March; we still need purchase invoices and the bank statement".

A compact team, because the firm wanted results before the next quarterly filing season.

These decisions were made with the partners, who knew better than anyone what their clients would and would not tolerate.

Everything that shipped, organised around the firm's monthly cycle: collect, extract, prepare, file.

Invoices in the firm's world are anything but standard: printed, handwritten, photographed on a shop counter, sometimes two to a page. We combined OCR with an LLM extraction step that returns structured fields, then validated the results against rules — GSTIN format and checksum, tax arithmetic, date sanity — before anything reached a staff member.

Staff review every extracted invoice, but instead of typing they confirm, with uncertain fields highlighted. We measured extraction accuracy on a set of real invoices from the firm and only widened the rollout once staff were confirming far more than correcting.

The first full GST cycle on BahiFlow was noticeably quieter. Most clients had sent documents before the reminders even started, and staff spent their time reviewing returns instead of collecting paper. The partners' favourite screen turned out to be the compliance calendar, which showed every client and every filing on one page for the first time.

Specific reminders work; generic ones do not. Telling a client exactly what is missing got a response; asking for "documents" got ignored.

Keep the existing channel. Letting clients continue to use WhatsApp, while BahiFlow organised everything behind it, removed the biggest adoption barrier.