GST & Tax

Omako has built-in GST support for Indian businesses. Tax is calculated automatically on each invoice based on your settings.

Setting Up GST

Before your invoices can calculate GST correctly, make sure you have:

1. Your GSTIN entered in Settings → Workspace Settings
2. Your client's GSTIN entered on their client record (for B2B invoices)

Supply Types

Each invoice has a supply type that determines how GST is split:

Supply Type	When to use	Tax applied
IGST	Interstate supply (your state ≠ client's state)	Single IGST rate
CGST + SGST	Intrastate supply (same state)	Half CGST + half SGST
Export	Supply to an overseas client	Zero-rated (0% GST)
Nil	Exempt supply	No GST

TIP

Omako detects the likely supply type based on your workspace state and the client's address, but always verify before sending.

How Tax is Calculated

For each line item:

Line total = Quantity × Unit price
Tax amount = Line total × Tax rate

After all line items:

Subtotal        = Sum of all line totals
Discount        = Flat or percentage discount (if any)
Taxable amount  = Subtotal − Discount
Total GST       = Sum of all line item taxes
Grand total     = Taxable amount + Total GST

All amounts are rounded to 2 decimal places using standard rounding (ROUND_HALF_UP).

TDS (Tax Deducted at Source)

If your client is required to deduct TDS before paying you, enable TDS on the invoice and set the TDS rate. Omako will calculate:

TDS amount   = Taxable amount × TDS rate
Net payable  = Grand total − TDS amount

The net payable is the amount you will actually receive after TDS deduction.

Composition Scheme

If your business is registered under the GST Composition Scheme, enable the Composition scheme flag on the invoice. This changes how tax is displayed to comply with composition dealer rules.

GST on the Invoice PDF

The invoice PDF shows a full tax breakdown:

• For IGST invoices: a single IGST column
• For CGST + SGST invoices: separate CGST and SGST columns

Both formats are GSTR-1 compliant.

GST Reports

All GST data from your invoices is automatically included in the Reports section for quarterly filing. See GST Compliance Reports →.