A working guide to gst software for gstr 2a reconciliation for Indian businesses: what 2A and 2B actually are, how to match, and what to do about the invoices that simply are not there.
The four kinds of mismatch
- In your books, not in 2B. Either the supplier has not filed, or you typed the invoice number or date differently from them.
- In 2B, not in your books. A purchase you never recorded — genuinely missed, or recorded against the wrong period.
- In both, different values. A rate difference, a rounding difference, or a credit note only one side has recorded.
- In both, different tax heads. Usually a place-of-supply disagreement: they billed IGST, you booked CGST + SGST.
Each has a different fix, and only the first one is ever the supplier’s fault as often as people assume. Fix your own side first — it is faster and it is free.
GSTR-2A: a statement that keeps moving
GSTR-2A is not a return you file. It is a dynamic statement the portal assembles from what your suppliers have reported about supplies made to you — and because it is dynamic, it changes as they file, including for periods you closed months ago.
That is both its use and its limitation. It is good for seeing what has turned up since you last looked and for chasing a supplier who has not filed. It is awkward as the basis of a credit claim, precisely because a figure you reconciled in May is not necessarily the same figure in July.
Which is why GSTR-2B exists alongside it: a static statement generated once per period, which is what a claim should be matched against. The sensible division is to claim against 2B and use 2A to watch what is still arriving.
If you are reconciling 2A, match on supplier GSTIN plus invoice number plus date rather than on amount. Amounts collide between invoices; that combination does not.
What Billixo does to reduce the work
- AI bill scanning. Photograph the supplier bill and the GSTIN, invoice number, date, lines and tax come back as a draft — no retyping, so no transcription mismatch.
- Supplier records with GSTIN and state, held once and reused, so the same supplier is never entered two slightly different ways.
- Purchase entries that keep the supplier’s own invoice number and date, exactly as printed, which is what the match is made on.
- Correct tax heads on purchases, derived from the supplier’s state rather than chosen.
- Period discipline, so a purchase booked into the wrong month is visible rather than silent.
- Exports in CSV, Excel and JSON, so your reconciliation can happen wherever you or your CA prefer.
A reconciliation method that finishes
- Download GSTR-2B for the period from the GST portal.
- Export your own purchase register for the same period.
- Match on supplier GSTIN + invoice number + invoice date. Do not match on amount — amounts collide, that combination does not.
- Normalise the obvious differences first: leading zeros, slashes, spacing in invoice numbers. A surprising share of "missing" invoices are the same invoice written two ways.
- Split the remainder into the four categories above.
- Fix everything on your side — wrong period, wrong number, unrecorded purchase.
- Chase the suppliers who have genuinely not filed, while you still owe them money.
- Keep the working file. When a notice arrives eighteen months later, it is the only thing that reconstructs what you did and why.
When to do it, and who should
Monthly, close to the filing date, by whoever entered the purchases — not by the CA in a batch at year end.
The person who entered the bill can look at a mismatch and remember the transaction. Someone reconciling nine months later can only see two rows that do not agree, and will make the safest assumption, which is usually to give up the credit.
This is the one compliance job where doing it yourself is genuinely cheaper than delegating it.
The cheapest reconciliation is the one you avoid
Every hour spent reconciling is an hour spent finding transcription errors. The way to spend fewer of them is to stop transcribing.
That is the strongest practical argument for scanning supplier bills rather than typing them: the invoice number and date come off the document itself, which is precisely the field pair the match is made on.
Businesses that scan their purchase bills report the same thing — the reconciliation does not become clever, it becomes short, because the only remaining mismatches are the real ones.
HSN and SAC codes, and how many digits you need
Every line on a tax invoice needs an HSN code for goods or a SAC for services. How many digits depends on your aggregate turnover in the preceding financial year — smaller businesses report fewer digits than larger ones, and B2B and B2C invoices are treated differently.
Because the requirement is tied to turnover and has been tightened in stages, the practical answer is to store the fullest code you can against each product once, and let the software report at the level required. A six-digit code can always be truncated; a two-digit one cannot be expanded.
Billixo keeps the code on the product record and carries it onto every line automatically, and its AI HSN lookup will suggest one from a plain description when you genuinely do not know.
Invoice numbering: one unbroken series per year
The invoice number has to be consecutive, unique within the financial year, and no more than sixteen characters of letters, numbers, slashes and hyphens. Gaps invite questions. Duplicates cause them.
This is the single most common reason a spreadsheet-based billing setup fails an audit: two people billing on two machines, both starting from the last number they remember. A system that issues the number centrally cannot make that mistake.
The series restarts on 1 April, and Billixo restarts it for you rather than waiting to be told.
The AI, and what it is actually for
The useful application of AI to billing is not a chatbot. It is the twenty minutes a day spent retyping things that already exist on paper.
- Scan a supplier bill. Photograph it; the lines, the GSTIN, the tax and the totals come back as a draft you check rather than a form you fill.
- Find the HSN code. Describe the product in plain words and get a code to confirm, instead of scrolling a list of eleven thousand.
- Ask about your own numbers. "What is outstanding over sixty days?" answered from your data, not a manual.
- Write the reminder. A polite, specific chase for an overdue invoice, ready to send on WhatsApp.
Nothing is sent anywhere until you ask for it, and the platform runs on whichever model it has been configured with — including one hosted on your own server.
Who this actually suits
It fits a business that raises between a handful and a few hundred invoices a month and would rather not think about GST between the 10th and the 20th: traders, distributors, retail counters, workshops, agencies, consultants, contractors and manufacturers who sell on invoice.
It fits less well if you need deep manufacturing costing, multi-currency consolidation, or payroll — those are different products, and pretending otherwise wastes your evaluation time.
If you are not sure which side of that line you fall on, the free plan answers it in an afternoon at no cost. Start free now.
Free, and what it costs you instead
Free software usually costs you something that is not money: your data held hostage, an export that does not work, ads inside your invoice, or a "free" tier so narrow it is a demo with a login screen.
The line here is drawn differently. Export works on the free plan — CSV, Excel and JSON — because data you cannot get out is not data you own. The invoice is a real compliant invoice, not a sample. The limits are on volume and on the conveniences, not on whether the thing works.
Start free now. If it does not suit you, take your data with you.
Where your data lives
On the server this platform is installed on. Every record carries a company identifier and every query is scoped to the signed-in account at the framework level, so one business cannot read another’s data by any route, including a crafted one.
Sign-in is rate limited, sessions can be restricted to one device per user, and passwords are stored hashed. Exports are available on every plan, free included: if you ever want to leave, your data leaves with you.
Frequently asked questions
Do I need separate reconciliation software?
Many businesses do not. If your purchase register is clean and exports properly, the comparison itself is straightforward. Dedicated tools earn their place at high volume or across many GSTINs.
Should I reconcile against 2A or 2B?
Against 2B for credit decisions, because it is static for the period. Use 2A to understand why something is or is not appearing, since it updates as suppliers file.
What should I match on?
Supplier GSTIN, invoice number and invoice date together. Matching on amount produces false positives constantly, because round numbers repeat.
Do I need to install anything?
No. It runs in a browser, on a laptop, desktop or phone, so there is nothing to install, nothing to update and nothing tied to one machine. If the office computer dies, you sign in from another one and everything is there.
Are the invoices valid for GST?
Yes. Every invoice carries the fields Rule 46 requires — GSTIN, HSN/SAC on each line, place of supply, the correct CGST/SGST or IGST split, and a consecutive invoice series that restarts each financial year.
Start free, decide later
You do not have to choose a plan to begin. Start on Free, use it for as long as it suits you, and upgrade only when a limit actually gets in your way — never automatically, and never because a countdown ran out.
Open the software demo → — or create the free account from the same page.
Read the full details → on the home page, including pricing and the AI features.
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