# Estimate New Zealand sole-trader income tax

Estimate a sole trader’s annual income tax, ACC earners’ levy and take-home profit, with the balance to pay, effective and marginal rates, and whether provisional tax starts next year.

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

## Tool reference

MCP tool ID: `nz_business_income_tax`. Availability: Live. Country: New Zealand.

Credit use: 1 credit.

## Input schema

```json
{
  "$schema": "https://json-schema.org/draft/2020-12/schema",
  "type": "object",
  "properties": {
    "tax_year": {
      "type": "string",
      "enum": [
        "2025-26",
        "2026-27"
      ]
    },
    "taxable_business_profit": {
      "type": "number",
      "minimum": 0,
      "maximum": 100000000
    },
    "other_taxable_income": {
      "type": "number",
      "minimum": 0,
      "maximum": 100000000
    },
    "other_acc_liable_earnings": {
      "description": "Other ACC-liable earnings, such as salary or wages, used to coordinate the maximum liable earnings for the self-employed levy estimate. The employee levy itself is not included in this ACC amount.",
      "type": "number",
      "minimum": 0,
      "maximum": 100000000
    },
    "tax_already_paid": {
      "description": "Combined tax already paid. Provide source_deductions_paid and provisional_tax_paid separately when the residual income tax and provisional-tax requirement must be assessed.",
      "type": "number",
      "minimum": 0,
      "maximum": 100000000
    },
    "source_deductions_paid": {
      "description": "Income-tax credit from PAYE, RWT or schedular deductions after removing any employee ACC Earners' levy included in gross PAYE. If you only know total PAYE, subtract the employee ACC levy before passing this amount; see the IRD return guide.",
      "type": "number",
      "minimum": 0,
      "maximum": 100000000
    },
    "provisional_tax_paid": {
      "description": "Actual provisional-tax payments already made for this income year.",
      "type": "number",
      "minimum": 0,
      "maximum": 100000000
    },
    "ietc_eligible": {
      "description": "Confirm full-year IETC eligibility; set false if not eligible. Use ietc_eligible_months for partial-year eligibility.",
      "type": "boolean"
    },
    "ietc_eligible_months": {
      "description": "Number of whole months eligible for IETC (0 to 12). Overrides the full-year assumption when supplied.",
      "type": "integer",
      "minimum": 0,
      "maximum": 12
    }
  },
  "required": [
    "tax_year",
    "taxable_business_profit"
  ],
  "additionalProperties": false
}
```

## Example input

```json
{
  "tax_year": "2026-27",
  "taxable_business_profit": 92000,
  "other_taxable_income": 0
}
```

## Usage notes

- Uses the progressive personal rates for the year you choose.
- Business expense deductions are not inferred: enter taxable profit.
- Not a replacement for filing an IR3 return.