apriltax File your GST →
apriltax

Help Centre

Step-by-step guides for filing GSTR-1 with apriltax. Every guide uses real screenshots - one line per step.

Getting started 3 guides Downloading your reports 3 guides Reviewing your numbers 4 guides Validation checks 13 guides Uploading your data 6 guides TCS Matching 4 guides GST filing basics 7 guides

Getting started

Login → add your business → start filing. Under two minutes, start to finish.

Downloading your reports

Where to find the GST report on each marketplace before you upload it to apriltax.

Reviewing your numbers

What the Review step shows, how to read each section, and how to dig into invoice-level detail.

Validation checks

30 automated checks run on your return before you file - what they are, and how to fix the ones that fail.

? What does AprilTax check before I file?
All 30 checks, grouped - HSN, tax arithmetic, documents, e-commerce, reconciliation.
? A validation check failed - what happens now?
Critical vs advisory findings, and the fix → re-run loop.
? Why am I asked to set my turnover slab?
The ₹5 Cr slab decides your HSN rules - filing can't proceed without it.
? A check says my HSN code is "not in the GST master list" - how do I fix it?
The portal rejects unknown HSN codes - correct them in the Review HSN modal.
? Table 12 doesn't match my sales totals - what do I do?
HSN summary vs Tables 4-11 mismatch - usually fixed by regenerating.
? A marketplace row shows negative sales or the wrong tax sign - is that a problem?
Negative net supply is usually fine; an opposite-sign tax needs a fix.
? A check flags "gaps in my invoice series" - should I worry?
Usually cancelled or unused numbers - advisory only, filing isn't blocked.
? "HSN code must be present on every B2B invoice line" - how do I fix it?
B2B lines always need an HSN of at least 4 digits - fill them in the HSN review table.
? My turnover is over ₹5 Cr - what extra HSN checks apply?
6-digit codes everywhere, B2C included, and both HSN sections in the JSON.
? "TCS statement differs from uploaded sales" - what do I do?
The portal's TCS statement and your files disagree - review it in the TCS Match step.
? "TCS statement operators appear in Table 14" flagged an operator - why?
An operator on your TCS statement is missing from Table 14, or listed under the wrong GSTIN.
? "GSTIN format invalid" - my own, or a buyer's. How do I fix each?
A GSTIN that isn't 15 valid characters gets rejected at the portal - here's both fixes.
? Other validation flags, decoded - quick reference
The occasional checks: cancellation rate, GST over 40%, duplicate operators, POS mismatch.

Uploading your data

What to upload for each marketplace - and how to bring in sales from Snapdeal, Myntra, Jio or your own website.

TCS Matching

Reconcile your sales against the GST portal's TCS statement - platform by platform, state by state - and rectify the gaps.

GST filing basics

Monthly vs quarterly vs yearly returns - which applies to you, the real due dates, and how to switch frequency on the GST portal.

Stuck? We reply in minutes.
A real apriltax team member, not a bot.