Calcuris
NPM · CALCURIS-MCP · SCANNED SEP 23
Tax calculators for US, UK, Canada, Australia: income tax, property tax, stamp duty.
Available components
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. How we score → Why this is hard to score →
Supply Chain Security98
- No malware found by supply-chain analysis.Pass
- No known CVEs affecting this package version or its production dependencies.Pass
- No install/post-install scripts declared.Pass
- 31 of 96 dependencies flagged as unhealthy. View diagnostics → Partial
Provenance & Transparency45
- Source repository is publicly reachable at the declared URL. View diagnostics → Pass
- Provenance check failed: no build-provenance attestation is published. See how to fix → View diagnostics → Fail
- Clear OSI-approved license (MIT).Pass
- Actively maintained (last published 71 days ago).Pass
- Disclosure check failed: no security disclosure policy was found in the source repository. See how to fix → Fail
Schema Quality & AI Usability65
- AI-judged instruction clarity (excellent).Pass
- 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. See how to fix → Fail
- Usage-examples check failed: none of the tools include examples. See how to fix → Fail
Stability & Change Management100
- No destabilizing schema changes in the last 30 days.Pass
Tool Coverage100
- 100% of tools have a non-trivial description (not blank, and not just the tool's name).Pass
- 100% of tool parameters carry a description.Pass
Tool Safety100
- No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.Pass
- We read all 7 captured tool definition(s), and no name or description among them implies an irreversible operation.Pass
- An AI judge read all 7 captured unit(s) of tool text and found none that tries to manipulate the model reading it.Pass
Capabilities100
- Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.Pass
How do I install the Calcuris MCP server?
Calcuris runs locally as an npm package, launched with npx -y calcuris-mcp. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.
npm · calcuris-mcp
claude mcp add tresor4k-calcuris-mcp -- npx -y calcuris-mcp
{
"mcpServers": {
"tresor4k-calcuris-mcp": {
"command": "npx",
"args": [
"-y",
"calcuris-mcp"
]
}
}
} {
"servers": {
"tresor4k-calcuris-mcp": {
"command": "npx",
"args": [
"-y",
"calcuris-mcp"
]
}
}
} codex mcp add tresor4k-calcuris-mcp -- npx -y calcuris-mcp
{
"$schema": "https://opencode.ai/config.json",
"mcp": {
"tresor4k-calcuris-mcp": {
"type": "local",
"command": [
"npx",
"-y",
"calcuris-mcp"
],
"enabled": true
}
}
} openclaw mcp add tresor4k-calcuris-mcp --command npx --arg -y --arg calcuris-mcp
mcp_servers:
tresor4k-calcuris-mcp:
command: "npx"
args: ["-y", "calcuris-mcp"] {
"McpServers": {
"tresor4k-calcuris-mcp": {
"Transport": "stdio",
"Command": "npx",
"Arguments": [
"-y",
"calcuris-mcp"
]
}
}
} assistant mcp add tresor4k-calcuris-mcp -t stdio -c npx -a -y calcuris-mcp
{
"mcpServers": {
"tresor4k-calcuris-mcp": {
"command": "npx",
"args": [
"-y",
"calcuris-mcp"
]
}
}
} Every change we have recorded for this component, newest first. Security-relevant changes are always shown. ▲ marks a change for the better, ▼ a change for the worse; unmarked changes are neutral.
- 23 Sept 26 0
- Stability: 0.97 → pass security
- Security disclosure: unverified → fail ▼ functional
- 22 Sept 26 +1
- Security disclosure: fail → unverified ▼ functional
- 20 Sept 26 +1
- Security disclosure: unverified → fail ▼ functional
- 19 Sept 26 0
- Security disclosure: fail → unverified ▼ functional
- 18 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 80 to 83. That category is still filling its 30-day observation window: 24 days of observed history at the previous scan, 25 at this one. The score rises as the window fills, whether or not the server changes.
- 17 Sept 26 −3
- Stability: pass → 0.80 functional
- 16 Sept 26 0
- Stability: 0.97 → pass security
- 15 Sept 26 +1
No change was recorded against any check on this day. Stability & Change Management went from 93 to 97. That category is still filling its 30-day observation window: 28 days of observed history at the previous scan, 29 at this one. The score rises as the window fills, whether or not the server changes.
Diagnostic detail from the automated scan of this channel: what the scanner observed at each step, so you can see exactly where a check passed or failed. It is informational only and never changes the trust score.
Captured 23 Sept 2026 · Analysed npm/calcuris-mcp@0.1.1
Provenance No attestation
The registry publishes no build provenance for this version, so there is nothing to verify.
| Result | No attestation |
|---|---|
| Ecosystem | npm |
Background: How many MCP packages publish verified provenance →
Dependencies 96 packages
| Packages resolved | 96 |
|---|---|
| Stale | 31 |
| Tree resolution | Complete |
Background: SBOMs and build attestations, explained →
The tools this component advertises to a client, with an estimated token cost for each. Expand a tool to see its parameters and schema. The per-tool counts are indicative and are not scored directly; the schema's total context footprint is one signal in Schema Quality & AI Usability. A tool's description is untrusted text the model reads on every call, which is what makes this list a security surface and not just an inventory: how tool poisoning works →
au_income_tax Australia resident income tax ~154
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).
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | Annual taxable income in AUD. |
No output schema declared.
No examples provided.
au_stamp_duty Australia stamp duty (land transfer duty) ~266
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).
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | Purchase price / property value in AUD. |
| stateCode | string | yes | State/territory code. Valid codes: NSW, VIC, QLD, WA, SA, TAS, ACT, NT. |
No output schema declared.
No examples provided.
ca_income_tax Canada federal + provincial income tax ~241
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).
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | Annual employment income in CAD. |
| provinceCode | string | yes | 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). |
No output schema declared.
No examples provided.
uk_dividend_tax UK dividend tax ~143
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).
| Name | Type | Req | Description |
|---|---|---|---|
| dividends | number | yes | Gross dividends received in GBP. |
| otherIncome | number | yes | Salary / other taxable income in GBP, excluding dividends. |
| year | string | yes | UK tax year. |
No output schema declared.
No examples provided.
us_income_tax US federal + state income tax ~254
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).
| Name | Type | Req | Description |
|---|---|---|---|
| dependents | integer | – | Number of qualifying children for the Child Tax Credit. |
| filingStatus | string | yes | IRS filing status: single, mfj (married filing jointly), hoh (head of household), mfs (married filing separately). |
| grossIncome | number | yes | 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. |
No output schema declared.
No examples provided.
us_paycheck US paycheck / take-home pay ~362
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).
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | 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 | yes | Pay period frequency. |
| payType | string | yes | 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. |
No output schema declared.
No examples provided.
us_property_tax US property tax ~203
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).
| Name | Type | Req | Description |
|---|---|---|---|
| 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 | yes | 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. |
No output schema declared.
No examples provided.
What is the Calcuris MCP server?
Calcuris is an MCP server listed in the public MCP registry as io.github.tresor4k/calcuris-mcp. Tax calculators for US, UK, Canada, Australia: income tax, property tax, stamp duty. This page covers its npm package (calcuris-mcp).
Is the Calcuris MCP server safe to use?
Calcuris scores 82 out of 100 on VerifyMCP. We found no known CVEs affecting it as of 23 September 2026. It declares no install or post-install scripts. That is a record of what we were able to check automatically, not an endorsement. The category breakdown on this page shows every signal behind the number, including the ones we could not confirm.
What tools does the Calcuris MCP server expose?
Calcuris exposes 7 tools: us_income_tax, us_paycheck, us_property_tax, ca_income_tax, au_income_tax, and 2 more. Their descriptions and schemas cost roughly 1,623 tokens of context every time the server is loaded.
Is the Calcuris MCP server still maintained?
Calcuris is still listed as active in the MCP registry. We last reached this channel on 23 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.
What licence is the Calcuris MCP server under?
Calcuris declares the MIT licence, which is OSI-approved. That covers the source only, and says nothing about the cost of any service it calls.