# Estimate a period's BAS GST return in Australia

Estimate the GST labels on a business activity statement from your period totals, on a cash or accrual basis, for the simpler or full reporting method.

Canonical: https://aroai.com/tools/au_gst_return_estimate/

## Tool reference

MCP tool ID: `au_gst_return_estimate`. Availability: Live. Country: Australia.

Credit use: 1 credit.

## Input schema

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "period_start": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$"
    },
    "period_end": {
      "type": "string",
      "pattern": "^\\d{4}-\\d{2}-\\d{2}$"
    },
    "accounting_basis": {
      "type": "string",
      "enum": [
        "cash",
        "accrual"
      ]
    },
    "reporting_method": {
      "type": "string",
      "enum": [
        "simpler",
        "full"
      ]
    },
    "gst_on_sales_from_records": {
      "description": "Record-derived GST on sales; used for 1A when supplied.",
      "type": "number",
      "minimum": 0,
      "maximum": 100000000
    },
    "gst_on_purchases_from_records": {
      "description": "Record-derived GST on purchases; used for 1B when supplied.",
      "type": "number",
      "minimum": 0,
      "maximum": 100000000
    },
    "sales": {
      "type": "object",
      "properties": {
        "g1_total_inclusive": {
          "type": "number",
          "minimum": 0,
          "maximum": 100000000,
          "description": "GST-inclusive G1 sales for accounting_basis: cash = received; accrual = sales first attributed to this period by invoice or any earlier payment (whichever comes first). Include categories below."
        },
        "export_sales": {
          "description": "GST-inclusive export sales included in G1.",
          "type": "number",
          "minimum": 0,
          "maximum": 100000000
        },
        "other_gst_free_sales": {
          "description": "Other GST-free sales included in G1.",
          "type": "number",
          "minimum": 0,
          "maximum": 100000000
        },
        "input_taxed_sales": {
          "description": "Input-taxed sales included in G1.",
          "type": "number",
          "minimum": 0,
          "maximum": 100000000
        }
      },
      "required": [
        "g1_total_inclusive"
      ],
      "additionalProperties": false
    },
    "purchases": {
      "type": "object",
      "properties": {
        "capital_total_inclusive": {
          "type": "number",
          "minimum": 0,
          "maximum": 100000000,
          "description": "GST-inclusive total capital purchases for accounting_basis: cash = paid; accrual = invoiced or paid, whichever comes first."
        },
        "non_capital_total_inclusive": {
          "type": "number",
          "minimum": 0,
          "maximum": 100000000,
          "description": "GST-inclusive total non-capital purchases for accounting_basis: cash = paid; accrual = invoiced or paid, whichever comes first."
        },
        "non_creditable_total_inclusive": {
          "description": "GST-inclusive purchases in this period that are not creditable for GST.",
          "type": "number",
          "minimum": 0,
          "maximum": 100000000
        }
      },
      "required": [
        "capital_total_inclusive",
        "non_capital_total_inclusive"
      ],
      "additionalProperties": false
    }
  },
  "required": [
    "period_start",
    "period_end",
    "accounting_basis",
    "reporting_method",
    "sales",
    "purchases"
  ],
  "additionalProperties": false
}
```

## Example input

```json
{
  "period_start": "2026-07-01",
  "period_end": "2026-09-30",
  "accounting_basis": "cash",
  "reporting_method": "simpler",
  "sales": {
    "g1_total_inclusive": 132000
  },
  "purchases": {
    "capital_total_inclusive": 0,
    "non_capital_total_inclusive": 44000
  }
}
```

## Usage notes

- Simpler BAS returns G1, 1A and 1B; full reporting adds G2, G3, G10 and G11.
- Omitted GST-free or input-taxed sales are assumed nil and mark the estimate incomplete.
- Labels omit cents, as the statement does.