Use Global Income Tax Calculator in your AI

 Download brotools-global-income-tax-calculator.zip Open the tool

A .zip skill: SKILL.md (how to answer), references/ (every input, its range and the Quick Starts) and scripts/build_link.py (builds and checks the link).

Install the skill

Pick your assistant. The demo plays the steps; press a step to jump to it.

    Menus move as these apps update: look for Skills (Claude: Settings, Customize; ChatGPT and Grok: Plugins; Gemini: Customise; Copilot: inside an agent). Gemini takes the unzipped folder; the others take the zip as it is. No skill support on your plan? Attach brotools-global-income-tax-calculator.zip or its SKILL.md to the chat and say "use this skill".

    Effective 7 November 2026. AI changes quickly: the UI, plans and features may be different by the time you see this.

    How to use it

    Ask as you would ask a friend. With the skill on, the AI keeps your figures, researches the rest, and hands you the link. It does not give the answer itself: the tool does, once you open the link.

    I have offers of S$180,000 in Singapore and HK$1,300,000 in Hong Kong. Which leaves more after tax?

    Using skill brotools-global-income-tax-calculator Searched: Singapore income tax for an Employment Pass holder, YA2027 Searched: Hong Kong salaries tax and MPF, 2026/27 Ran scripts/build_link.py: link checked

    Assumptions

    1. Singapore: an Employment Pass holder, so no CPF, taxed as a resident on S$180,000 a year.
    2. Hong Kong: single, with MPF at 5% capped at HK$1,500 a month.
    3. Currency: shown in US dollars at the rates the page dates, for reading only.

    Your scenario

    Open Global Income Tax Calculator on this scenario

    https://tool.adjiebrotots.com/global-income-tax-calculator/#load&v=1&dispCur=USD&why.dispCur=Read%20both%20in%20US%20dollars%20to%20compare%20them&json=%7B%22jobs%22:%5B%7B%22country%22:%22SG%22,%22sgRes%22:%22ep%22,%22amount%22:180000%7D,%7B%22country%22:%22HK%22,%22amount%22:1300000%7D%5D%7D&note=Singapore%20against%20Hong%20Kong,%20November%202026

    Open the link to see the result.

    Open this scenario
    • Your figures stay yours. Anything you state goes in as you said it; correct any assumption and the AI sends a new link.
    • Checked before you see it. The skill's script checks every input's name, range and choices before the AI sends the link, so it opens the scenario listed.
    • The tool shows what the AI chose. When the link opens, a banner lists each value the AI set and why, with an Undo back to your own inputs.

    Ready to try it?

    Download the skill Read the guide Open the tool All Brotools skills