India Specific · CGST Act §9(3) / IGST Act §5(3)

GST Reverse Charge (RCM) Calculator

Compute the GST liability under the Reverse Charge Mechanism — the supplier doesn't collect tax, the recipient self-assesses it. Splits CGST/SGST or IGST, and flags Input Tax Credit eligibility.

EndpointPOST /v1/india-specific/gst-rcm-calculatorVersionv1.0.0StandardCGST Act §9(3) / IGST Act §5(3)Added2026-05-16
Try it interactively →Raw schema JSON

Inputs

base_amount_inrRequirednumber (₹)Invoice Amount
required · min 1 · max 100000000 · default 10000
gst_rate_pctenumGST Rate
default "18" · one of: 0, 5, 12, 18, 28
transaction_typeenumSupply Type
default "intra_state" · one of: intra_state, inter_state
Intra-state → CGST + SGST. Inter-state → IGST.
itc_eligiblebooleanITC Eligible
default true
Most business-use supplies are eligible. Common ineligibles: motor vehicles for personal use, food & beverages, club memberships.

Outputs

gst_rate_pctnumber (%)GST Rate
cgst_inrnumber (₹)CGST
sgst_inrnumber (₹)SGST
igst_inrnumber (₹)IGST
total_tax_inrnumber (₹)Total Tax (to deposit)
itc_amount_inrnumber (₹)Input Tax Credit
net_cost_inrnumber (₹)Net Cost to Business
compliance_notestringNote

Example request

curl · POST /v1/india-specific/gst-rcm-calculator
curl -X POST https://api.toolsamurai.com/v1/india-specific/gst-rcm-calculator \
  -H "Authorization: Bearer sk_free_•••••••••••••••" \
  -H "Content-Type: application/json" \
  -d '{
  "base_amount_inr": 10000,
  "gst_rate_pct": "18",
  "transaction_type": "intra_state",
  "itc_eligible": true
}'

Example response

200 OK
{
  "ok": true,
  "tool": "gst-rcm-calculator",
  "domain": "india-specific",
  "version": "1.0.0",
  "result": {
    "gst_rate_pct": …,
    "cgst_inr": …,
    "sgst_inr": …,
    "igst_inr": …,
    "total_tax_inr": …,
    "itc_amount_inr": …,
    "net_cost_inr": …,
    "compliance_note": "…"
  },
  "meta": { "latency_ms": …, "request_id": "req_…" }
}

Tags

gstrcmreverse-chargeindiataxitc