Key takeaways
What this article covers, in order:
- What does "doing GST" actually include?
- DIY, full CA, or something in between?
- When can you safely do it yourself?
- When should you definitely have a CA?
- What does each option really cost?
- How do you actually share books with a CA?
It's the 19th. Your CA isn't picking up, GSTR-3B is due tomorrow, and you realise you have no idea what your tax payable is this month. That's the moment most owners start asking whether they should just file it themselves. If your business is small, domestic and your invoices are clean, you can. If you deal with exports, reverse charge, several states or a notice, a CA is worth every rupee. And for most growing businesses the sensible answer sits in between: you keep the books and handle routine filing, your CA reviews and takes the hard parts, and you both work in the same set of books.
What does "doing GST" actually include?
It's easier to decide once you split the work up, because this isn't all-or-nothing.
There's recording: raising invoices, entering purchase bills, logging payments. There's reconciling: matching purchases with GSTR-2B and making sure customers see your invoices. There's preparing GSTR-1 and GSTR-3B from those books, and filing, which means submitting, paying and signing with EVC or DSC. Then there's judgement, things like whether a credit is blocked or what the place of supply is. And finally representation: notices, audits, the annual return.
Software makes the first four a lot lighter. Judgement and representation are where a professional earns their fee.
DIY, full CA, or something in between?
| You do it all | CA does it all | You + CA in shared books | |
|---|---|---|---|
| Recording transactions | You | You send papers, CA's team enters | You |
| GSTR-2B matching | You | CA | You, CA reviews the oddities |
| Filing GSTR-1 and 3B | You | CA | You after CA sign-off, or CA |
| Annual return, notices | You (risky) | CA | CA |
| Cost | Software only | Monthly retainer | Smaller, review-based fee |
| Your time | Most | Least | Moderate |
| Risk of an expensive mistake | High if anything is complex | Lowest | Low |
| How well you know your numbers | Well | Often not very | Well |
We're not going to quote CA fees. They vary hugely by city, volume and scope. Ask two or three CAs for a written scope and a fee for your situation, and compare like with like.
When can you safely do it yourself?
DIY works when most of this is true. You have one GSTIN in one state. You sell mostly within India at standard rates. You raise dozens of invoices a month, not thousands. You rarely buy from unregistered suppliers and don't pay for services that fall under reverse charge. Someone in the business is comfortable on the GST portal. And you've filed on time and never had a notice.
A freelance consultant billing eight clients a month fits this nicely. So does a small shop with the same dozen suppliers every month.
When should you definitely have a CA?
Get help, or keep the CA you have, if any of these apply:
- exports or SEZ supplies, where zero-rating, LUT and refunds have real consequences if handled wrongly
- reverse charge on legal services, GTA, imported services and so on
- more than one GSTIN, with branch transfers between states
- blocked credits and ITC reversals, which cause a lot of demands
- the annual GSTR-9 and GSTR-9C, where the whole year comes together
- any notice at all
- corrections to earlier periods, which come with time limits
Even confident DIY filers should have a CA's number saved for exactly these moments.
What does each option really cost?
DIY looks free, but the cost is your time plus the price of mistakes. A missed GSTR-3B deadline means 18% a year interest on tax paid late in cash, and a daily late fee (₹50 a day, ₹20 for a nil return, subject to caps; confirm current amounts on the GST portal). An ITC claim that doesn't match GSTR-2B can turn into a demand with interest a year later.
A full-service CA costs a predictable fee. The hidden cost is that you lose touch with your own numbers. You learn your GST liability on the 19th, not during the month when you could have planned for it.
The middle path is a lower review fee, some of your time, and you stay in the loop.
How do you actually share books with a CA?
The middle path only works if you stop emailing spreadsheets. Here's a routine that holds up for most small businesses.
Once, at the start
Invite your CA into your accounting software with their own login. Sit together for an hour and agree the chart of accounts and your item list with HSN/SAC codes, so things are classified properly from day one. Then put in an email who files each return and who signs it. Sounds formal, but it saves an argument later.
Every month
| When | You | Your CA |
|---|---|---|
| During the month | Raise invoices, enter bills, import bank statements | Nothing yet |
| Around the 14th | Check GSTR-2B matching, flag supplier mismatches | Looks at flagged items, advises on ITC |
| Before GSTR-1 is due | Make sure every sale is in | Reviews the GSTR-1 summary |
| Before GSTR-3B is due | Check payable, interest, late fee | Signs off, or files |
| After filing | Save the acknowledgement | Notes anything to carry forward |
On QRMP, shift to the quarterly rhythm: GSTR-1 after the quarter (with optional IFF in between), GSTR-3B by the 22nd or 24th depending on your state, and PMT-06 payments in the first two months.
Once a year
Your CA reviews the full year before you close the books and prepares or checks GSTR-9. For FY 2025-26 that's due 31 Dec 2026 unless the date is extended. It's also a good time to agree what changes for the rest of FY 2026-27.
A few house rules
Keep one set of books, and never edit a downloaded copy and re-upload it. Once a period is filed, leave its invoices alone and use a credit or debit note to fix things. If your CA disagrees with an entry, ask them to flag it rather than quietly overwrite it, so you learn why. And OTPs stay with the owner unless you've agreed in writing that the CA files.
What this looks like for one business
Kavita runs a small textile trading firm in Jaipur. About 15 sales invoices and 25 purchase bills a month. For years she sent a WhatsApp folder of invoice photos to her CA on the 8th and paid a monthly retainer.
She moved to the shared-books approach. Now she raises invoices in software, imports her bank statement every week, and checks GSTR-2B mismatches around the 15th. Her CA logs in before the 20th, looks at the two or three bills Kavita has flagged, and approves GSTR-3B. Kavita files it herself.
The CA's work became a review, so they agreed a lower fee. Kavita knows her payable a week earlier. And when one supplier filed late in Aug 2026, she spotted the missing credit in GSTR-2B herself instead of finding out at year-end.
(Kavita is an illustration, not a customer.)
How HelloBooks helps
HelloBooks is set up for this kind of arrangement. Your CA can be invited to work in the same books, and HelloBooks Free includes 2 users, which is you and your CA. Pro at ₹499/month adds unlimited users and roles if your team is bigger.
On Free, which is ₹0 with no card and no expiry, you get unlimited GSTR-1 and GSTR-3B filing for one GSTIN, filed directly to the GST portal from inside HelloBooks. GSTR-2B reconciliation with ITC tracking means you and your CA see the same mismatches. Before anyone files GSTR-3B, interest and late fee are shown as the GST portal's own figure. Bank statement import keeps the books current between your CA's reviews.
GSTR-9 isn't part of Free. Pro generates GSTR-9 ready to file, which your CA can then review. See GSTR-3B filing, GSTR-2B reconciliation and pricing.
FAQs
Can I file GST returns without a CA?
Yes. Any registered person can file their own returns on the GST portal. You don't legally need a CA for GSTR-1 or GSTR-3B.
Is filing GSTR-3B myself risky?
For a simple business, not especially, as long as you match GSTR-2B before claiming ITC and you file on time. The risk climbs with exports, reverse charge and multiple states.
Will my CA agree to work inside my software?
Most CAs are comfortable with online accounting, and many would rather log in to clean books than squint at photos of bills. Ask early.
If a return is wrong, who's responsible?
The registered taxpayer. That's why it's worth reading what's filed, even when your CA prepared it.
Should my CA have my GST portal password?
Better that your CA has their own login in your accounting software and filing is authorised with your OTP or signature. If you do share portal access, put the terms in writing.
Do the routine bits yourself, keep your CA for the judgement calls, and you'll both have a calmer 20th.
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