Au

Ask Claude: "What's my take-home pay on $95k in NSW?" — and get the exact answer instantly.

An open-source Python MCP server that gives Claude Desktop accurate Australian tax, super, HECS, and CGT calculations — all using 2025-26 ATO rates.

Get Early Access (Free Beta) · GitHub

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What It Does

Tool	Example question
calculate_payg_tax	"What's my PAYG tax on $95k?"
calculate_super_contribution	"How much super on $120k with 5% salary sacrifice?"
calculate_hecs_repayment	"I earn $82k with $35k HECS — what do I repay this year?"
calculate_cgt	"I sold shares for $25k (bought $10k, held 2 years). CGT?"
salary_package_comparison	"Compare $90k vs $110k in VIC after tax and stamp duty"

All figures use 2025-26 ATO rates and current legislation.

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5-Second Install

1. Clone the repo

git clone https://github.com/liamfraz/au-mcp-server.git
cd au-mcp-server

2. Add to Claude Desktop config (~/Library/Application Support/Claude/claude_desktop_config.json on macOS):

{
  "mcpServers": {
    "au-financial": {
      "command": "uv",
      "args": ["run", "--directory", "/absolute/path/to/au-mcp-server", "python", "server.py"]
    }
  }
}

3. Restart Claude Desktop — done. Ask Claude any Australian tax question.

No uv? Use pip install -r requirements.txt then point command to your Python binary.

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Pricing

Tier	Price	Who it's for
Individual (Beta)	$0 / month	Anyone using Claude Desktop personally
Business	$29 / month (coming soon)	Teams, accountants, hosted API access

Beta is free while we collect feedback. Lock in free access now:

Get Early Access — Free During Beta

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Example Queries

Once connected, try asking Claude:

• "What is my PAYG tax on a $95,000 salary?"
• "How much super will my employer contribute on $120k?"
• "I have $35,000 HECS debt and earn $82,000 — what's my repayment this year?"
• "I bought shares for $10,000, sold for $25,000 after 2 years. What's my CGT if I earn $75,000?"
• "Compare $90k vs $110k salaries in VIC including stamp duty."

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Tool Reference

calculate_payg_tax

income        float   Annual taxable income (AUD)
filing_year   str     "2025-26" (default)

Returns: income_tax, medicare_levy, total_tax, net_income, effective_rate_pct, marginal_rate_pct

calculate_super_contribution

salary                float   Annual base salary (AUD)
employee_contrib_pct  float   Extra salary-sacrifice % (default 0)

Returns: employer_super, total_concessional, within_concessional_cap, cap_headroom, total_package

calculate_hecs_repayment

income      float   Annual HELP repayment income (AUD)
hecs_debt   float   Outstanding HELP balance (AUD)

Returns: repayment_rate, annual_repayment, years_to_repay

calculate_cgt

purchase_price   float   Cost base (AUD)
sale_price       float   Sale proceeds (AUD)
hold_years       float   Holding period in years
income           float   Other taxable income (AUD)

Returns: capital_gain, discount_eligible, taxable_gain, estimated_cgt, effective_cgt_rate

salary_package_comparison

salary_a   float   First salary (AUD)
salary_b   float   Second salary (AUD)
state      str     NSW | VIC | QLD | WA | SA | TAS | ACT | NT

Returns: Full after-tax breakdown for both salaries + stamp duty + difference summary

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Disclaimer

These calculations are for illustrative purposes only and do not constitute financial or tax advice. Always consult a registered tax agent or financial adviser for your specific situation. Figures are based on publicly available ATO 2025-26 information.