Raise an invoice and the tax splits itself, the ledger balances itself and GSTR-1 is ready when the month ends.
Orbit Agency GSTIN 29ABCDE1234F1Z5 · Place of supply 29-Karnataka
| Item | SAC | Rate | Amount |
|---|---|---|---|
| Brand identity design | 998391 | 18% | ₹8,000.00 |
| Website copy | 998391 | 18% | ₹2,000.00 |
Journal entry
Most small businesses do their GST twice: once on the invoice, and again in a spreadsheet when the return is due.
compter does it once. The invoice you send is the entry in your books and the line in your return, so the three can never disagree.
Invoices
Search invoices New invoice| Number | Customer | Supply | Total | Status |
|---|---|---|---|---|
| INV-2026-0042 | Orbit Agency | CGST + SGST | ₹11,800.00 | Paid |
| INV-2026-0041 | Saffron Foods, Pune | IGST | ₹2,68,800.00 | Sent |
| INV-2026-0040 | Kaveri Textiles | CGST + SGST | ₹56,000.00 | Overdue |
| INV-2026-0039 | Marina Studio, Chennai | IGST | ₹57,600.00 | Paid |
| INV-2026-0038 | Walk-in customer | CGST + SGST | ₹1,048.95 | Paid |
Per-line HSN or SAC and rate, place of supply worked out, a PDF with the rupee set properly, and credit notes that reverse exactly.
Bring a bank or UPI statement as CSV. Duplicates are flagged and each line lands in an account by what it says.
Every statement line is matched, partly matched or left for you, and the difference shows until it is zero.
Balance sheet, income statement and cash flow come straight from the entries, for any date or period.
Your business is in Bengaluru, Karnataka. Give an amount, a GST rate and the customer's city, and see what compter posts.
Place of supply 29-Karnataka, same state as you: CGST + SGST
| Taxable value | ₹10,000.00 |
|---|---|
| CGST 9% | ₹900.00 |
| SGST 9% | ₹900.00 |
| Invoice total | ₹11,800.00 |
| Account | Debit | Credit |
|---|---|---|
| 1200 Accounts Receivable | 11,800.00 | |
| 4000 Sales Revenue | 10,000.00 | |
| 2201 CGST Output | 900.00 | |
| 2202 SGST Output | 900.00 |
Debits and credits both ₹11,800.00. Balanced.
The ledger, the GST maths and the GSTR-1 export live in accounting-core, a Rust crate under the MIT or Apache-2.0 licence. Read exactly how your tax is worked out.
Read the source
let gst = GstCalculator::new(false); // same state
let split = gst.calculate_by_category(
BigDecimal::from(10000),
GstCategory::Higher, // 18%
None,
)?;
assert_eq!(split.cgst_amount, BigDecimal::from(900));
assert_eq!(split.sgst_amount, BigDecimal::from(900));Nothing reaches the ledger unless debits equal credits. GST sits on output accounts 2201 to 2203, apart from revenue.
A sent invoice is never rewritten. A credit note reverses it line by line, and both show in your return.
Your workspace opens with a chart of accounts, GST output accounts and your GSTIN and state on every invoice.
compter is web-based GST invoicing and double-entry accounting software for Indian businesses. You raise GST invoices, and each one posts itself to your books and to your GSTR-1 return.
Yes. Each invoice line carries its HSN or SAC code and GST rate. compter compares the place of supply with your registered state: the same state gives CGST and SGST, another state gives IGST.
compter exports GSTR-1 as the JSON file the GST portal accepts, with invoices already sorted into B2B, B2CL and B2CS. You upload that file on the GST portal to file the return.
Yes. Import a bank or UPI statement as a CSV file. You see a preview first, lines already in your books are flagged as duplicates, and each payment is put in an account based on its description. You can then reconcile the statement against your books line by line.
Raise a credit note. A sent invoice is never rewritten; the credit note reverses it line by line, and both appear in your books and your GSTR-1 return.
The engine is. The ledger, the GST calculations and the GSTR-1 export live in accounting-core, a Rust library available under the MIT or Apache-2.0 licence on GitHub.
Already have one? Sign in