# Calcuris (npm · calcuris-mcp)

Tax calculators for US, UK, Canada, Australia: income tax, property tax, stamp duty.

- Trust score: 66/100 (medium)
- Change this week: +42
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-08-03

## Components

- npm · `calcuris-mcp`: 66/100 (this document), [markdown](https://verifymcp.io/servers/tresor4k-calcuris-mcp/calcuris-mcp.md), [page](https://verifymcp.io/servers/tresor4k-calcuris-mcp/calcuris-mcp)

## Channel facts

- Registry: `npm`
- Package: `calcuris-mcp`
- Version: `0.1.1`
- Transport: `stdio`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically from public evidence about the published package, including repeated runs of it in an isolated sandbox, and we only credit what we can confirm. Scores are 0–100 per category. Scoring method: https://verifymcp.io/docs/scoring (what has changed: https://verifymcp.io/docs/scoring/changelog)

Scored 2026-08-03.

- **Supply Chain Security**: 87/100
  - No malware found by supply-chain analysis.
  - Only part of the dependency tree could be resolved (95 of 99), so this covers what we could see, not the whole tree.
  - No install/post-install scripts declared.
  - Only part of the dependency tree could be resolved (95 of 99), so this covers what we could see, not the whole tree.
- **Provenance & Transparency**: 45/100
  - Source repository is publicly reachable at the declared URL.
  - Provenance check failed: no build-provenance attestation is published.
  - Clear OSI-approved license (MIT).
  - Actively maintained (last published 20 days ago).
  - Disclosure check failed: no security disclosure policy was found in the source repository.
- **Schema Quality & AI Usability**: 63/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 1623 tokens (~231/item across 7 items; 7 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 23/100
  - Stability observed for 7 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 100/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 100% of tool parameters carry a description.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### Claude

```bash
claude mcp add tresor4k-calcuris-mcp -- npx -y calcuris-mcp
```

### Codex

```bash
codex mcp add tresor4k-calcuris-mcp -- npx -y calcuris-mcp
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "tresor4k-calcuris-mcp": {
      "type": "local",
      "command": [
        "npx",
        "-y",
        "calcuris-mcp"
      ],
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add tresor4k-calcuris-mcp --command npx --arg -y --arg calcuris-mcp
```

### Hermes

```yaml
mcp_servers:
  tresor4k-calcuris-mcp:
    command: "npx"
    args: ["-y", "calcuris-mcp"]
```

### Other

```json
{
  "mcpServers": {
    "tresor4k-calcuris-mcp": {
      "command": "npx",
      "args": [
        "-y",
        "calcuris-mcp"
      ]
    }
  }
}
```

## Changelog

Every change recorded for this component, newest first. Days that predate change tracking, or that we cannot explain, say so: "we were watching and nothing happened" and "we were not watching" are different claims.

### 2026-08-02 (score 66, +61)

- [security regression] Provenance: unverified → fail
- [security improvement] Known CVEs: unverified → partial
- [security improvement] Install scripts: unverified → pass
- [security improvement] Malware scan: unverified → pass
- [functional regression] Security disclosure: fail → unverified
- [functional improvement] MCP protocol: unverified → pass
- [functional improvement] Maintenance: unverified → pass
- [functional improvement] Stability: unverified → 0.20
- [functional improvement] Dependency health: unverified → partial
- [functional improvement] License: unverified → pass
- [functional improvement] Schema quality: unverified → excellent
- [functional improvement] Tool coverage: unverified → 100
- [functional] Licence: MIT

### 2026-08-01 (score 5, −13)

- [functional regression] Tool coverage: 100 → unverified

### 2026-07-31 (score 18, −7)

- [functional] We updated how we score, so this day's move reflects our rubric, not a change to the server

### 2026-07-30 (score 25, −18)

- [security regression] Malware scan: pass → unverified

### 2026-07-28 (score 43, +19)

- [functional regression] Security disclosure: unverified → fail
- [functional improvement] Tool coverage: unverified → 100
- [functional] First check of Schema quality: fail
- [functional] First check of Schema quality: fail
- [functional] First check of Tool coverage: 100
- [functional] First check of Schema quality: unverified

### 2026-07-27 (score 24)

First indexed and scored.

## MCP tools (7)

### `us_income_tax` (~254 tokens)

US federal + state income tax

Computes US federal income tax (2026 IRS brackets, post-OBBBA) plus an estimated state income tax, with a full progressive bracket breakdown. Example: { grossIncome: 95000, filingStatus: "single", stateCode: "CA" }. Estimate for guidance — 2026 rates from official sources (IRS/Tax Foundation/CRA/ATO/state revenue offices/HMRC).

Input parameters:

- `dependents` (integer): Number of qualifying children for the Child Tax Credit.
- `filingStatus` (string, required): IRS filing status: single, mfj (married filing jointly), hoh (head of household), mfs (married filing separately).
- `grossIncome` (number, required): Gross annual income in USD.
- `itemizedAmount` (number): Total itemized deductions in USD (only used if useItemized is true and it exceeds the standard deduction).
- `preTaxContributions` (number): Annual pre-tax 401(k)/traditional IRA contributions, reduces taxable income.
- `stateCode` (string): Optional two-letter state code to also estimate state income tax. Omit to skip state estimation.
- `useItemized` (boolean): Use itemized deductions instead of the standard deduction.

### `us_paycheck` (~362 tokens)

US paycheck / take-home pay

Computes US take-home pay per pay period: federal withholding, Social Security, Medicare (+ Additional Medicare), state tax, and net pay, for salaried or hourly workers. Example: { payType: "salary", annualSalary: 80000, payFrequency: "biweekly", filingStatus: "single", stateCode: "TX" }. Estimate for guidance — 2026 rates from official sources (IRS/Tax Foundation/CRA/ATO/state revenue offices/HMRC).

Input parameters:

- `annualSalary` (number): Annual salary in USD (used when payType is "salary").
- `dependents` (integer): Number of dependents (informational, not withheld via CTC in this engine).
- `extraWithholding` (number): Additional federal withholding requested PER PAY PERIOD (W-4 line 4c).
- `filingStatus` (string, required): IRS filing status used for federal withholding.
- `hourlyRate` (number): Hourly rate in USD (used when payType is "hourly").
- `hoursPerWeek` (number): Hours worked per week (used when payType is "hourly", or to derive an hourly-equivalent when salaried).
- `payFrequency` (string, required): Pay period frequency.
- `payType` (string, required): Whether pay is a fixed annual salary or an hourly rate.
- `preTaxHealth` (number): Pre-tax health/HSA (section 125) contribution PER PAY PERIOD (reduces federal/state AND FICA taxable income).
- `preTaxRetirement` (number): Pre-tax 401(k) contribution PER PAY PERIOD (reduces federal/state taxable income, not FICA).
- `stateCode` (string): Optional two-letter state code to also withhold state tax. Omit to skip.

### `us_property_tax` (~203 tokens)

US property tax

Estimates annual/monthly US property tax from a home value and either a custom rate or a state's real 2026 effective property tax rate. Example: { homeValue: 350000, stateCode: "NJ" }. Estimate for guidance — 2026 rates from official sources (IRS/Tax Foundation/CRA/ATO/state revenue offices/HMRC).

Input parameters:

- `assessmentRatioPct` (number): Percent of market value actually assessed (default 100; some states assess less than market value).
- `exemption` (number): Homestead exemption amount in USD, subtracted from the assessed value.
- `homeValue` (number, required): Market value of the home in USD.
- `ratePct` (number): Optional custom effective property tax rate (%). Overrides the state's rate if both are given.
- `stateCode` (string): Optional two-letter state code. When provided (and ratePct is not), the state's real 2026 effective property tax rate is used automatically.

### `ca_income_tax` (~241 tokens)

Canada federal + provincial income tax

Computes Canadian federal + provincial/territorial income tax, CPP/QPP (+ CPP2/QPP2), EI/QPIP, and net take-home pay for a given province, 2026 rates. Example: { grossIncome: 75000, provinceCode: "ON" }. Set compareAllProvinces: true to get every province/territory side by side. Estimate for guidance — 2026 rates from official sources (IRS/Tax Foundation/CRA/ATO/state revenue offices/HMRC).

Input parameters:

- `compareAllProvinces` (boolean): If true, also return the same calculation for every province/territory (ignores provinceCode for the comparison table, but a single result for provinceCode is still returned as "result").
- `grossIncome` (number, required): Annual employment income in CAD.
- `provinceCode` (string, required): Two-letter province/territory code. Valid codes: AB, BC, MB, NB, NL, NS, NT, NU, ON, PE, QC, SK, YT.
- `rrspContribution` (number): Annual RRSP contribution in CAD (deducted from taxable income).

### `au_income_tax` (~154 tokens)

Australia resident income tax

Computes Australian resident income tax (2025-26 ATO brackets) plus Medicare levy, Medicare levy surcharge, LITO offset, and HELP/HECS repayment. Example: { taxableIncome: 95000, privateHospitalCover: true, hasHelpDebt: false }. Estimate for guidance — 2026 rates from official sources (IRS/Tax Foundation/CRA/ATO/state revenue offices/HMRC).

Input parameters:

- `hasHelpDebt` (boolean): True if the taxpayer has an outstanding HELP/HECS debt (triggers compulsory repayment).
- `privateHospitalCover` (boolean): True if covered by private hospital insurance (avoids the Medicare Levy Surcharge).
- `taxableIncome` (number, required): Annual taxable income in AUD.

### `au_stamp_duty` (~266 tokens)

Australia stamp duty (land transfer duty)

Computes Australian state/territory stamp duty on a property purchase, including first-home-buyer concessions and the foreign purchaser surcharge where applicable. Example: { propertyValue: 750000, stateCode: "NSW", firstHomeBuyer: false, foreignResident: false, principalResidence: true }. Set compareAllStates: true to compare every state/territory for the same property value. Estimate for guidance — 2026 rates from official sources (IRS/Tax Foundation/CRA/ATO/state revenue offices/HMRC).

Input parameters:

- `compareAllStates` (boolean): If true, also return the same calculation for every state/territory.
- `firstHomeBuyer` (boolean): True if the buyer qualifies as a first home buyer (applies concession where available).
- `foreignResident` (boolean): True if the buyer is a foreign person (applies the foreign purchaser surcharge).
- `principalResidence` (boolean): True if this will be the buyer's principal place of residence (owner-occupier); false for an investment purchase.
- `propertyValue` (number, required): Purchase price / property value in AUD.
- `stateCode` (string, required): State/territory code. Valid codes: NSW, VIC, QLD, WA, SA, TAS, ACT, NT.

### `uk_dividend_tax` (~143 tokens)

UK dividend tax

Computes UK dividend tax using HMRC's stacking method (dividends sit on top of other income), including the tapered Personal Allowance and the £500 dividend allowance, with a year-over-year comparison. Example: { otherIncome: 40000, dividends: 15000, year: "2026/27" }. Estimate for guidance — 2026 rates from official sources (IRS/Tax Foundation/CRA/ATO/state revenue offices/HMRC).

Input parameters:

- `dividends` (number, required): Gross dividends received in GBP.
- `otherIncome` (number, required): Salary / other taxable income in GBP, excluding dividends.
- `year` (string, required): UK tax year.

## Diagnostics

Captured diagnostic sections: Provenance, Dependencies. The full working is on the page: https://verifymcp.io/servers/tresor4k-calcuris-mcp/calcuris-mcp#diagnostics

## Score history

- 2026-08-03: 66
- 2026-08-02: 66
- 2026-08-01: 5
- 2026-07-31: 18
- 2026-07-30: 25
- 2026-07-28: 43
- 2026-07-27: 24

## Links

- npm package: https://www.npmjs.com/package/calcuris-mcp
- Socket report: https://socket.dev/npm/package/calcuris-mcp
- Repository: https://github.com/tresor4k/calcuris-mcp
- Website: https://calcuris.com/
- Changelog RSS feed: https://verifymcp.io/servers/tresor4k-calcuris-mcp/calcuris-mcp/changelog.xml
- Changelog JSON feed: https://verifymcp.io/servers/tresor4k-calcuris-mcp/calcuris-mcp/changelog.json
- HTML version of this page: https://verifymcp.io/servers/tresor4k-calcuris-mcp/calcuris-mcp