WhatsApp for chartered accountants: ITR documents, GST return reminders and fee follow-ups

Vinod Kulkarni and Pratibha Rao run a chartered accountancy practice in Kothrud, Pune: two partners, nine staff including four article assistants, about 650 income tax clients and 90 GST clients (an invented example). In July the firm’s WhatsApp is five phones. Form 16 photos arrive on whichever number the client last used. A trader sends his September purchase bills at 11 pm on the 10th to an article assistant whose articleship ended in August. Twice a day someone asks “is my return filed?”, and the answer is in a spreadsheet on another desk.

WhatsApp for chartered accountants works when the firm, not each staff phone, owns the conversation. This playbook covers the CA firm’s WhatsApp from end to end: one number with a desk per team, collecting ITR documents without breaking Meta’s rules on identity documents, GST return reminders with dates you’ve checked, status updates, fee reminders and the tax-tips broadcast. Lenders and insurance agents have their own version in the NBFC and insurance playbook; this one is for practices that file returns.

What a CA firm’s WhatsApp carries

Message	Who sends first	Category if you send it first	Season
”Which documents do you need?”	Client	Reply (service)	June to July, and audit season
Pending documents reminder	Firm	Utility	Filing season
GSTR-1 and GSTR-3B reminders	Firm	Utility	Every month or quarter
Computation ready, return filed	Firm	Utility	Filing season
Fee due	Firm	Utility	After each engagement
Budget changes, tax tips	Firm	Marketing	Whenever you write them

Everything the client starts is a service message for 24 hours. Everything the firm starts after that needs an approved template, and the category sets the price: ₹0.1150 for utility and ₹0.8631 for marketing per delivered message to an Indian number, before GST, on Meta’s rate card effective 1 October 2026. Our guide to how Meta sorts marketing, utility and service has the full test.

Step 1: one firm number, a desk per team

Put the firm’s number on the WhatsApp Business Platform through a provider and answer from a shared inbox. Give each desk its own team inbox: ITR, GST, accounts. Assign every client to one staff member, so “who is handling the Hinjewadi trader?” has an answer on the screen, and let the partners see every desk.

Two rules make it stick. Staff reply from the inbox, never from their own WhatsApp. When an article assistant’s term ends, their clients are reassigned that afternoon with the full thread, including every question asked and every document received. Our piece on customers stuck in staff phones makes the longer case, and the shared inbox guide covers setup.

Internal notes do the work the margin of the file used to: “client says no capital gains this year; confirm with AIS before filing”. They stay on the client’s record, not in someone’s notebook.

Step 2: document collection, and what not to ask for in the chat

This is where a CA firm has to read Meta’s rules closely. WhatsApp’s Business Messaging Policy, updated 23 September 2026, says: “Don’t share or ask people to share full length individual payment card numbers, financial account numbers, personal ID card numbers, or other sensitive identifiers.” Meta’s template review page lists, as a rejection reason, requesting sensitive identifiers including “documents from users that might contain sensitive identifiers”, and adds that “requesting partial identifiers (ex: last 4 digits…) is OK”.

PAN cards, Aadhaar, bank statements and Form 16 all carry exactly those numbers. Our reading, and it is a reading, not legal advice:

Keep in the WhatsApp chat	Take through your own upload link or office
The checklist for this client and this year	PAN and Aadhaar copies
Questions: “Did you sell any shares or property?”	Bank statements and passbook pages
Sales and purchase summaries for GST, and queries on them	Form 16 and salary slips
The computation summary for approval, with PAN masked	Capital-gains statements showing account numbers
Confirmation that something arrived	Anything a client would not want forwarded

Clients will still send a Form 16 photo into the chat, unasked. Don’t forward it to a staff group. Save it into the client’s file the same day, because Meta’s media page says a media ID from a webhook is only downloadable for 7 days. Reply that it’s received, and point to the upload link for next time.

If a client sends a large scanned file, Meta’s cap on incoming media is 100 MB; past that you get error 131052 and nothing arrives. Ask for the PDF the employer or broker issued rather than a phone photo of a printout. It’s smaller and readable.

The reminder template names no documents. The list sits behind the link, so the template doesn’t request identity documents:

Hi {{1}}, your income tax return for {{2}} is waiting on a few items from you. The list and the secure upload page are at the link below. Your contact at our office is {{3}}.

Buttons: Open my checklist (URL), I have a question. It concerns the client’s own return and sells nothing, so we expect utility.

Step 3: deadline reminders, with dates you have checked

Every date in a reminder should come from the department’s own page, read in the week you send it. Dates move.

On 18 October 2026 the income tax e-filing portal’s news page carried Circular No. 07/2026 dated 28 September 2026. It extends the AY 2026-27 return deadline for the persons at Sl. No. 2 of the table under Explanation 2 to section 139(1), the audit cases, from 31 October to 21 November 2026, and the audit report date from 30 September to 21 October 2026. For every other category, use the due date notified for the year and check it on the portal before you send.

On the same day the GST portal’s home page listed these upcoming due dates:

Return	Period	Due date shown on gst.gov.in, 18 Oct 2026
GSTR-1, monthly	September 2026	11 October 2026
GSTR-1, quarterly	July to September 2026	13 October 2026
GSTR-3B, monthly	September 2026	20 October 2026
GSTR-3B, quarterly	July to September 2026	22 or 24 October 2026 (the portal lists both)
CMP-08	July to September 2026	18 October 2026

Send two reminders per filing: one asking for the data about five days before the firm’s internal cut-off, and one before the tax payment is due.

Hi {{1}}, GSTR-1 for {{2}} is due on {{3}}. Please share your sales bills and credit notes for the period by {{4}} so we can file on time. Reply here if there were no sales this period.

Keep the return name, period and dates as variables filled from your own calendar, not typed into the approved wording. CBDT’s recent notifications on the portal already refer to the Income-tax Act, 2025, and form names will keep changing.

A reminder to an existing client about their own return is utility. “Last date is near, file with us for ₹999” sent to people who aren’t clients is marketing, at 7.5 times the price.

Step 4: status updates that stop the “is it filed?” calls

Three messages cover most of a return: documents received, computation ready for approval, return filed.

Hi {{1}}, your income tax return for {{2}} was filed on {{3}}, acknowledgement number {{4}}. If it still needs e-verification, tap below and we'll help.

Buttons: Help me e-verify, All done. We don’t read the acknowledgement number as a sensitive identifier, but the PAN is one, so leave it out and let the client download the full acknowledgement from their own e-filing account. For the computation, send a summary with the PAN masked and buttons for Approve and Call me first. The approval sits in the thread with a time stamp, which is better than “he said OK on the phone”.

Step 5: fee reminders without the awkward call

A reminder that a fee is due for work the client already agreed to is a payment reminder on an existing account. Meta’s utility examples include “Reminder: Your monthly payment for” a service “will be billed on” a date.

Hi {{1}}, a reminder that our fee of ₹{{2}} for {{3}} is due on {{4}}. Payment details are at the link below. Reply here if you have any question about the bill.

Keep it factual. Meta’s template review rejects content “threatening a customer with legal action”, and a line about stopping work reads close enough to that to be worth leaving out. Put the firm’s bank and UPI details behind the link rather than in the message.

An offer to renew next year’s compliance retainer is different. Meta lists attempts “to renew subscriptions” as marketing “even if requested by users”, so send it as a marketing template to clients who opted in.

Step 6: tax tips are marketing, so ask first

A Budget summary or “five deductions salaried clients miss” is a marketing message, however useful. It needs the client’s opt-in, which Meta says must clearly state they’re agreeing to messages from your firm, by name. Ask at onboarding: “Can we send you tax updates on WhatsApp, about twice a month?” Record the answer. The opt-in guide has wording and record-keeping.

Split the list: salaried clients don’t need GST notes, and traders don’t need HRA tips. Every newsletter carries a Stop updates button that works the same day. Chartered accountants also have the ICAI’s own rules on advertising and solicitation; read them before anything goes to people who aren’t already clients.

Data care: PAN, Aadhaar and the DPDP Rules

Never put a full PAN, Aadhaar or bank account number in a template variable. Meta allows partial identifiers, so “PAN ending 234F” is fine if you need to tell two family members apart. Never forward one client’s chat or file to another client; Meta’s policy says so in as many words.

India’s Digital Personal Data Protection Rules were notified in November 2025. Registration of consent managers starts around mid-November 2026, and the notice and consent duties apply from around May 2027. A firm with every client file on staff phones can’t easily secure or delete records on request. Our opt-in and DPDP guide covers the dates; this is general information, not legal advice. (Terms such as utility template are in our glossary.)

What it costs

Illustrative numbers for Vinod and Pratibha’s firm, on Meta’s India rate card effective 1 October 2026, before GST.

Message, July (filing season)	Category	Volume	Meta cost
Replies to clients, about 6 each	Service	3,900	1,000 free, then 2,900 × ₹0.1150 = ₹333.50
Pending-documents reminders, 2 each	Utility	1,300	₹149.50
Computation ready and return filed	Utility	1,300	₹149.50
GST reminders, 2 per client	Utility	180	₹20.70
Fee reminders	Utility	300	₹34.50
Tax tips, twice to 400 opted-in clients	Marketing	800	₹690.48

About ₹1,380 for the busiest month. In an ordinary month (180 GST reminders, 100 fee reminders, replies inside the free 1,000, and the newsletter) it’s about ₹720, and the newsletter is ₹690 of it.

Checklist

• One firm number, a team inbox per desk, every client assigned
• Staff reply from the inbox only; reassign the day someone leaves
• An upload link for PAN, Aadhaar, bank statements and Form 16
• A document-reminder template that names no documents
• Every due date checked on incometax.gov.in or gst.gov.in the week you send
• Return name, period and dates as variables, not fixed wording
• Filed-return template without the PAN
• Fee reminder that states facts and threatens nothing
• Opt-in recorded before the first tax-tips message
• Incoming files saved to the client’s file within 7 days

Start with the desk inboxes and the GST reminder. The next GSTR-3B date is on the portal’s home page; check it today and the first template has its date.