Income Tax Calculator Skill

Overview

Income Tax Calculator works by applying the official federal income tax brackets to your gross income after the standard deduction. It calculates the tax owed at each bracket level and returns a detailed breakdown including effective and marginal tax rates.

Live Test Income Tax Calculator Skill Skill →

The tool

Once your client is connected to the VerveKit server, this appears in its tool list as IncomeTaxCalculatorSkill. It is read-only and open-world — it fetches and never mutates anything on your side — so most clients call it without asking you to confirm.

{
  "name": "IncomeTaxCalculatorSkill",
  "arguments": {
    "income": "85000",
    "rate": "22"
  }
}

You do not name the tool yourself; the model picks it. Asking about 85000 in the terms this skill covers is enough for it to reach for IncomeTaxCalculatorSkill on its own — naming it explicitly also works, and is the way to force the call.

Connecting

One server URL covers every skill in the catalog, including this one. Authorization is OAuth: the client opens a browser once, and there is no key to paste into a config file.

{
  "mcpServers": {
    "vervekit": {
      "url": "https://api.vervekit.com/v1/mcp"
    }
  }
}

https://api.vervekit.com/v1/mcp

Per-client setup — Claude, Cursor, VS Code, ChatGPT — is on the MCP setup page.

Arguments

These are the properties on the tool's inputSchema, so a well-behaved client validates them before the call is made. Premium arguments are accepted on every plan but only take effect on plans that include them.

What the model gets back

The result carries a structuredContent object matching the tool's declared outputSchema, so a client reads fields without parsing prose. status is "ok" and error is null on success; a null field means the value was not available for that input, not that the call failed.

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{
  "status": "ok",
  "error": null,
  "data": {
    "year": 2025,
    "filing_status": "single",
    "income": 85000,
    "standardDeduction": 15000,
    "taxableIncome": 70000,
    "totalTax": 10852.5,
    "effectiveRate": "12.77%",
    "marginalRate": "22%",
    "incomeAfterTax": 74147.5,
    "monthlyTax": 904.38,
    "monthlyIncome": 6178.96,
    "brackets": [
      {
        "rate": 0.1,
        "ratePercent": "10.0%",
        "rangeMin": 0,
        "rangeMax": 11925,
        "taxableAmount": 11926,
        "taxAmount": 1192.6
      },
      {
        "rate": 0.12,
        "ratePercent": "12.0%",
        "rangeMin": 11926,
        "rangeMax": 48475,
        "taxableAmount": 36550,
        "taxAmount": 4386
      },
      {
        "rate": 0.22,
        "ratePercent": "22.0%",
        "rangeMin": 48476,
        "rangeMax": 103350,
        "taxableAmount": 21524,
        "taxAmount": 4735.28
      }
    ]
  }
}

Response fields

Paths are relative to data. Premium fields are absent rather than zeroed on plans that do not include them, so check for presence instead of comparing to 0.

Failure modes

Errors come back as tool errors carrying a sentence the model can act on, not a bare status code. Error handling covers the full list.

A call costs 2 credits each time the tool actually runs; a model that reasons about the tool without calling it costs nothing.

Use cases

Job Offer Evaluation

When weighing multiple job offers, candidate compensation portals calculate net take-home pay and federal tax obligations across different filing statuses.

Payroll Withholding Estimation

HR platforms estimate employee annual federal tax liability and monthly deductions directly from gross salary inputs to forecast withholdings.

Retirement Distribution Modeling

To model retirement drawdowns, financial advisors project changes in effective and marginal rates as client taxable distributions shift across tax bands.

Custom Rate Invoicing

Compute estimated tax obligations and remaining net earnings for freelance contracts using custom tax percentages and project deductions.

Other ways to use Income Tax Calculator Skill

Set up Income Tax Calculator Skill on VerveKit, or reach the same source a different way. Your VerveKit account and credits work on all of them — one key, one balance.

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