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# Issue invoice

> Issue a domestic invoice for a contractor with one or more lines. Input schema, a tools/call example and an example result.

Source: https://cotlet.dev/docs/mcp/ifirma/issue_invoice

Docs sections: [Get started](https://cotlet.dev/docs.md) · [REST API](https://cotlet.dev/docs/api.md) · [MCP](https://cotlet.dev/docs/mcp.md) · [SDKs & CLI](https://cotlet.dev/docs/sdks.md) · [Integrations](https://cotlet.dev/docs/integrations.md)

Issue a domestic invoice for a contractor with one or more lines.

iFirma MCP tools: https://cotlet.dev/docs/mcp/ifirma.md

MCP tool: `ifirma_write → issue_invoice`

Access: write. Confirm: waits for the user's OK before it runs.

Issues the invoice with the next number in the series, the same as "Wystaw". Lines need name, quantity, unit, unit price and VAT rate; a line that is not exempt may also need a PKWiU code. The invoice is not sent to KSeF or to the buyer until you call send_invoice_to_ksef or send_invoice_email. By default you confirm each call; you can switch that off for this tool.

## Parameters

| Name | Type | Required | Description |
|---|---|---|---|
| `contractor_id` | string | yes | Contractor ID from list_contractors or create_contractor. |
| `lines` | array | yes | Lines: {name, quantity, unit, unit_price, vat_rate}. vat_rate is 23, 8, 5, 0 or exempt. |
| `calculate_from` | string | no | net or gross: which price you give. Default: net. |
| `issue_date` | string | no | YYYY-MM-DD. Default: today. |
| `sale_date` | string | no | YYYY-MM-DD. Default: issue date. |
| `due_date` | string | no | YYYY-MM-DD. |
| `payment_method` | string | no | transfer, cash or card. |
| `notes` | string | no | Remarks printed on the invoice, up to 1000 characters. |

## tools/call

```json
{
  "jsonrpc": "2.0",
  "id": 1,
  "method": "tools/call",
  "params": {
    "name": "ifirma_write",
    "arguments": {
      "operation": "issue_invoice",
      "arguments": {
        "contractor_id": "c_4817",
        "calculate_from": "net",
        "issue_date": "2026-10-14",
        "sale_date": "2026-10-14",
        "due_date": "2026-10-28",
        "payment_method": "transfer",
        "lines": [
          {
            "name": "Website retainer",
            "quantity": 2,
            "unit": "month",
            "unit_price": 500,
            "vat_rate": 23
          }
        ]
      }
    }
  }
}
```

## Example response

```json
{
  "content": [
    {
      "type": "text",
      "text": "{ ... same JSON as structuredContent ... }"
    }
  ],
  "structuredContent": {
    "id": 7020118,
    "number": "41/2026",
    "draft": false,
    "buyer": "Blue Fern Studio",
    "net": 1000,
    "vat": 230,
    "gross": 1230,
    "currency": "PLN",
    "issue_date": "2026-10-14",
    "due_date": "2026-10-28",
    "ksef_status": null
  },
  "isError": false
}
```

Previous: [Save invoice draft](https://cotlet.dev/docs/mcp/ifirma/save_invoice_draft.md)
Next: [Send invoice to KSeF](https://cotlet.dev/docs/mcp/ifirma/send_invoice_to_ksef.md)

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