GSTR-3B Calculator
Combine outward tax and ITC to preview your GSTR-3B cash position.
Enter your period’s output tax and input credit to preview GSTR-3B.
How the calculation works
GSTR-3B is where tax gets paid. Preview it by combining output tax from sales with the input credit you can use, then see the cash needed.
- Output tax
Table 3.1(a): CGST + SGST + IGST on outward supplies - ITC applied
Credits used per utilisation rules against each head - Net cash
Any liability left after credits = cash to deposit via challan
Worked example
Output tax ₹18,000 (as above) against ₹10,000 of ITC.
You enter
You get
Important points to keep in mind
- GSTR-3B is a self-declared summary — keep invoice-level backup from GSTR-1 books.
- Interest at 18% p.a. applies on cash short-paid after the due date.
- Reverse-charge liabilities (Section 9(3)/9(4)) add to output tax but get no ITC offset in the same table section.
- Once numbers look right, prepare the actual GSTR-3B inside GSTSelf.
Frequently asked questions
What's the difference between GSTR-1 and GSTR-3B?
GSTR-1 lists invoice-level outward supplies; GSTR-3B summarises both supplies and input credit and is where payment actually happens.
Can ITC cover the entire liability?
Yes when credits are sufficient and head-compatible. Otherwise the shortfall must be paid in cash before filing.
Is this calculator valid for QRMP filers?
The arithmetic is identical quarterly; just make sure you're using the whole quarter's figures.
Related GST tools
Prepare your returns in GSTSelf
Done estimating? Prepare the actual return.
GSTSelf walks you through your invoices, builds GSTR-1 and GSTR-3B data, and keeps everything on your device — no uploads, no account.