Number 1: 
EarningsCall
Earnings call transcripts, audio, and data from 9,000+ public companies via API
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- DR 32 no change since last check
APIs & SDKs · Australia
AfterTax AU
Free Australian tax API and MCP server for AI agents
- Community votes
- 0
- DR by Ahrefs
- 0 no change since last check
Ahrefs Domain Rating benchmarked 13 Nov 2026, rebuilt 13 Nov 2026.
Connect AI assistants or use a JSON API and JavaScript library to calculate Australian take-home pay, tax withholding, refunds and superannuation using ATO
What it is
AfterTax AU provides a free Australian tax API and MCP server for AI agents and developers. It calculates take-home pay, PAYG withholding, tax refunds, superannuation and validates Australian business numbers using the ATO's published formulas and tax rates.
The service offers three ways to access these calculations: connect Claude, ChatGPT, Cursor or any MCP client to the MCP server; use the JSON API with no sign-up or API key required; or install the open-source JavaScript library via npm.
All calculations are tested against the ATO's published sample data and matched to the dollar for 2025–26 and 2026–27. The tool covers PAYG withholding for various scenarios including foreign residents, study loans, Medicare levy variations, seniors and pensioners, and bonuses. It also calculates annual tax estimates with offsets, Medicare levy and surcharge, and study loan repayments.
What it is built with
- Take-home pay calculator for Australian salaries and hourly rates
- PAYG withholding calculation using ATO Schedule 1 formulas
- Bonus and commission withholding calculation
- Annual tax estimate with offsets and Medicare levy
- Superannuation guarantee calculation at 12%
- ABN, ACN and TFN validation using check-digit algorithms
- MCP server integration for Claude, ChatGPT and Cursor
- JSON API accessible without sign-up or API key
- Open-source JavaScript npm library with no dependencies
- Tax rates and thresholds for 2025–26, 2026–27 and 2027–28
Pricing
Pricing model: Open source
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AfterTax AU metrics
| Metric | Value |
|---|---|
| Domain Rating | 0 no change since last check |
| Trust Flow | 0 no change since last check |
| Citation Flow | 0 no change since last check |
| Referring domains | 0 no change since last check |
| External backlinks | 0 no change since last check |
Ahrefs Domain Rating benchmarked 13 Nov 2026, rebuilt 13 Nov 2026. Majestic benchmarked 13 Nov 2026, rebuilt 13 Nov 2026. Link data built by Majestic. Trust Flow, Citation Flow and Topical Trust Flow are trademarks of Majestic-12 Ltd.
AfterTax AU domain build sheet
Open the build sheet
| Domain age | 0 days |
|---|---|
| Registered | |
| Expires | |
| Registrar | Cloudflare, Inc. |
| DNSSEC | Not signed |
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Questions from the bench
- What makes AfterTax AU different from using AI model memory for tax calculations?
- Australian tax rates changed on 1 July 2026, and PAYG withholding uses the ATO's own formulas and rounding, not the tax brackets. AI models trained before then get these numbers wrong. AfterTax AU uses the ATO's published formulas and matches every row of the ATO's sample data.
- How is the calculator tested for accuracy?
- The calculator is tested against all of the ATO's published sample data: 432 rows for each of 2025–26 and 2026–27, covering weekly, fortnightly and monthly pays across tax scales and Medicare levy adjustments. It matches all of them to the dollar.
- What are the three ways to use the API?
- You can connect Claude, ChatGPT, Cursor or any MCP client to the MCP server; call the JSON API with query parameters or POST JSON; or install the open-source JavaScript library via npm.
- What does the calculator not cover yet?
- Working holiday makers, back payments, termination payments, Fair Work award rates, and your exact final tax which depends on your full income, deductions and offsets and is worked out when you lodge a tax return.
- Can AfterTax AU provide personal tax advice?
- No. AfterTax AU provides general information only, not financial or tax advice. For personal tax advice or to look at your tax affairs, contact the ATO or a registered tax agent.
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