In this guide · 8 sections
- Use four lines: what is due, who it affects, by when, and a calm close such as "Check your own case with your tax consultant".
- Never write fees, "best" or "No. 1", client results, or "like / follow / share our page" — the ICAI Code says members should not solicit people to visit or like their page (3.3.12).
- Instagram now allows up to five hashtags on a post or Reel (announced December 2025). Use 3–5 specific ones, not generic lists.
- On LinkedIn, 2–3 hashtags at the end are plenty. Facebook needs one or two at most. Google Business Profile posts need none — write plain text.
- Limits worth knowing: Instagram captions up to 2,200 characters, LinkedIn posts up to 3,000. But a tax caption rarely needs more than 300.
The poster does the visual work; the caption is what makes a client act. A good caption under a GSTR-3B poster tells the reader in five seconds whether it concerns them and what to do. A poor one — "Important update!!! Contact us for best GST services #gst #tax #ca #india #business..." — is ignored at best, and at worst breaks the ICAI's rules on what a member may say. This guide gives a four-line structure, ten ready captions, hashtag guidance for each platform, and the lines a CA should never write.
The four-line caption structure
Almost every tax or compliance caption can be written in four short lines:
- What is due — the exact return, payment or change, with the period. "GSTR-3B for November 2026".
- Who it affects — so readers can skip it if it is not them. "Monthly GST filers".
- By when — the date, with the year when it is a one-off. "Due 20 December 2026".
- A calm close — what the reader should do, without selling. "Please share your data by the 17th" or "Check your own case with your tax consultant."
Then the firm name and, on Instagram, LinkedIn and Facebook, a few hashtags. That is it. Four lines are read; ten lines are skimmed. If the poster already shows the date, the caption still repeats it — captions are what search and screen readers pick up, and some people only read the text.
The same structure suits a tax update ("What changed / who it affects / from when / talk to your consultant") and a festival greeting needs even less: one line of wishes and the firm name. Timing and wording for reminders are covered in due date reminder posts, and greetings in festival greeting posts.
Ten example captions
Copy these, change the period and dates to the current ones, and check each date on the official portal before posting — dates are often extended by notification.
GST
1. GSTR-3B for November 2026 is due on 20 December 2026 for monthly filers.
Please share your purchase and sales details with us by 17 December.
— [Firm name], Chartered Accountants, [phone]
#GST #GSTR3B #[YourCity]
2. GSTR-1 for monthly filers: due on the 11th of every month for the previous month's sales.
Matching invoices in GSTR-1 and GSTR-3B avoids mismatch notices later.
Check your filing frequency with your tax consultant.
#GST #GSTR1
3. Annual GST return (GSTR-9) for FY 2025-26: due 31 December 2026, unless extended.
Applies to registered taxpayers who must file the annual return.
Reconciling your books with GSTR-1 and GSTR-3B early makes it easier.
#GST #GSTR9 #AnnualReturn
Income tax
4. Third advance tax instalment: 75% of the year's estimated tax is due by 15 December 2026.
For taxpayers whose tax is not fully covered by TDS.
If your income has changed this year, review your estimate with your tax consultant before the date.
#AdvanceTax #IncomeTax
5. ITR filing for most salaried individuals: due 31 July 2027 for income of FY 2026-27.
Keep Form 16, interest certificates and your AIS ready.
Filing early leaves time to fix mismatches.
#ITR #IncomeTax #TaxFiling
6. Got an SMS or email about an income tax notice?
Check it on the income tax e-filing portal before you reply or pay — genuine notices can be verified there.
Never share OTPs or passwords on a call.
— [Firm name], [phone]
TDS
7. TDS deducted in November 2026 must be deposited by 7 December 2026.
Applies to all deductors — businesses, firms and individuals required to deduct TDS.
Late deposit attracts interest. Check your challans with your consultant.
#TDS #IncomeTax
8. Quarterly TDS statements for October–December 2026: due 31 January 2027.
For salary and non-salary deductions alike.
Share your challan details and deductee PANs early.
#TDS #TDSReturn
Festival and general
9. Wishing you and your family a bright and prosperous Diwali.
— Team [Firm name]
#HappyDiwali
10. Financial year 2026-27 ends on 31 March 2027.
If you plan tax-saving investments under the old regime, they must be made by that date.
Not sure which regime suits you? Discuss it with your tax consultant.
#TaxPlanning #YearEnd
Notice what is missing from all ten: no fees, no "best", no "lowest price", no "DM us to file", no "like and share", no client stories. Each one is information plus the firm's name and contact.
In OneClick Scheduler you add the poster and one caption and publish to Instagram, Facebook, LinkedIn and Google Business Profile together — or schedule the week in one sitting.
Lines a CA should never write in a caption
The ICAI Code of Ethics allows members to post information on social networking sites, subject to conditions. In a caption, these are the usual slips:
- Calls to like, follow, share or visit the page. Paragraph 3.3.12 of the Code says a firm can provide the link to its page, but members should not solicit people to visit or like their page. "Follow us for daily updates" and "Like and share" are out.
- Fees and offers. "ITR filing at ₹499", "Diwali discount on GST registration". Fees are not to be advertised.
- Exaggerated or comparative claims. "Best CA in Pune", "No. 1 tax experts", "fastest refunds".
- Testimonials and results. "Our client saved ₹2 lakh", a client's thank-you note, a screenshot of a refund.
- Catch words and slogans. A tagline that works like a brand slogan can be read as a catch word; keep the sign-off to the firm name.
- Push promotion of audit and attestation services. "Book your tax audit now" — exclusive services are for pull media only.
- Fear. "Heavy penalty!!! Last chance!!!" A line on interest or late fee is fine; panic is not.
The full list, with paragraph references, is in what a CA can post on social media and Google.
OneClick Scheduler: Schedule the week ahead, or let auto-post rules handle due dates and festivals.
Try itHashtags: how many on each platform
Instagram announced in December 2025 that it would limit posts and Reels to five hashtags, saying that fewer, more targeted hashtags work better than many generic ones. The old habit of pasting 30 tags in the first comment is gone. For a practice, use three to five:
- One or two topic tags: #GST, #GSTR3B, #IncomeTax, #ITR, #TDS, #AdvanceTax.
- One local tag: #[YourCity] or #[YourCity]Business, so people near you see it.
- Optionally one language or audience tag: #HindiTaxTips, #SmallBusinessIndia.
Skip tags like #CA, #CharteredAccountant, #Tax or #India — they are so broad that your post is lost among millions, and #BestCA is a claim in hashtag form.
LinkedIn lets you add hashtags to a post or document. Two or three at the end of the post are enough: one topic (#GST, #IncomeTax), and one for the audience if relevant (#MSME, #Startups). Hashtags in the middle of sentences make a post hard to read. More on LinkedIn in LinkedIn for CA firms.
Hashtags do little on Facebook Pages. Use one or two topic tags, or none. The same caption as Instagram is fine if you trim the tags.
Google Business Profile
No hashtags. Google posts are read by people looking at your profile in Search and Maps; hashtags there are just clutter. Google's own tips for posts ask you to avoid extra characters and text that adds no value. Write the four lines in plain sentences. OneClick Scheduler uses one caption for all the platforms you select in a post, so either keep the hashtags to two or three on the last line, or make a second post for Google with the same poster and the caption without tags. One more Google caution: posts that include a phone number in the description may be rejected if Google cannot verify it is connected to the business — let the profile's own call button do that job.
Caption length and limits by platform
| Platform | Limit | What works for a tax post |
|---|---|---|
| 2,200 characters; up to 5 hashtags | 3–5 lines; the first line must make sense on its own, because the rest is hidden behind "more" | |
| 3,000 characters per post | 4–8 lines; a short explanation is welcome here | |
| Facebook Page | Long captions allowed | Same as Instagram, fewer tags |
| Google Business Profile | Keep it short | 2–4 plain sentences, no hashtags, no phone number in the text |
For a due-date post, 200–300 characters is plenty everywhere. Length is not the goal; a clear first line is.
A simple workflow for the week
- On Monday, list the week's posters: the due dates, one tax update, any greeting.
- Write the four lines for each, using the examples above as templates. Keep a shared document of your best captions so staff can reuse them.
- Check every date against the GST portal or the income tax portal on the day you write it.
- Add hashtags: two or three specific ones on the last line work on Instagram, LinkedIn and Facebook alike; leave them out of anything going only to Google.
- Schedule the posts. In OneClick Scheduler you add the poster and caption once and publish to all four platforms; if you use the auto-post rules for due-date and festival posters, you can add a short line of your own to those captions too.
Read each caption once more just before it goes out — especially the date and the year. A caption with last year's date does more harm than no caption.
Frequently asked questions
How many hashtags should a CA firm use on Instagram?
Three to five. Instagram announced in December 2025 that it is limiting posts and Reels to five hashtags. Use one or two topic tags (#GST, #ITR), one local tag, and skip broad tags like #CA or #Tax.
Should I use hashtags on Google Business Profile posts?
No. Hashtags do nothing useful in Google posts, and Google asks businesses to avoid extra characters and text that adds no value. Write two to four plain sentences.
Can I write "follow us for more tax updates" in a caption?
Better not. Paragraph 3.3.12 of the ICAI Code of Ethics says a firm can provide the link to its social media page, but members should not solicit people to visit or like their page.
What should a due-date caption say?
Four lines: what is due, who it affects, by when, and a calm close such as "Please share your data by the 17th" or "Check your own case with your tax consultant", followed by the firm name.
What is the caption limit on Instagram and LinkedIn?
Instagram captions can be up to 2,200 characters; LinkedIn posts up to 3,000 characters. A tax or due-date caption rarely needs more than 300.
Sources
- ICAI — Code of Ethics 2026 (3.3.12: no soliciting visits or likes; conditions on write-ups)
- Social Media Today — Instagram limits hashtags to five per post or Reel (December 2025, quoting Instagram)
- Meta for Developers — Instagram media reference (caption up to 2,200 characters)
- LinkedIn Help — Post and share updates (up to 3,000 characters)
- LinkedIn Help — Upload and share documents (hashtags optional in the description)
- Google Business Profile Help — About posts (tips; phone numbers in post descriptions may be rejected)
OneClick Scheduler posts your poster and caption to Instagram, Facebook Pages, LinkedIn and Google Business Profile from one screen; auto-post rules can add your own line to every due-date and festival poster. Free to post now; a 7-day scheduling trial for new users.
