# ccpcrate — Canadian CCPC corporate tax (remote · ccpcrate.ca)

Deterministic Canadian CCPC rate stack: small business deduction and grinds, Part IV, RDTOH.

- Trust score: 62/100 (medium)
- Change this week: +3
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-09-20

## Components

- remote · `ccpcrate.ca`: 62/100 (this document), [markdown](https://verifymcp.io/servers/ca-ccpcrate-ccpcrate/ccpcrate.md), [page](https://verifymcp.io/servers/ca-ccpcrate-ccpcrate/ccpcrate)

## Channel facts

- Endpoint: `https://ccpcrate.ca/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.1.0`

## Trust breakdown

How this component scores in each security and reliability category. Every signal is checked automatically against the live server, 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 2026-09-20.

- **Endpoint Security**: 46/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - Authorisation not fully verified: no authorisation is required to call this server, and 4 tool(s) never declared a destructiveHint. The MCP spec treats an absent hint as destructive by default, so we cannot call this surface safe.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - HSTS check failed: the Strict-Transport-Security header is absent.
  - DNSSEC check failed: this domain isn't protected by DNSSEC.
- **Transport & Reachability**: 100/100
  - Verified streamable-http transport via a live MCP handshake.
- **Schema Quality & AI Usability**: 57/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 2600 tokens (~650/item across 4 items; 4 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 40/100
  - Stability observed for 12 of 30 days with no destabilising changes; credit accrues until the full window elapses.
- **Tool Coverage**: 99/100
  - 100% of tools have a non-trivial description (not blank, and not just the tool's name).
  - 97% of tool parameters carry a description.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 4 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 5 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a current MCP spec version (2026-07-28).

## Install

### How do I install the ccpcrate — Canadian CCPC corporate tax MCP server?

ccpcrate — Canadian CCPC corporate tax is a hosted endpoint at https://ccpcrate.ca/mcp, so there is nothing to install locally. Ready-made configuration for Claude, Cursor, VS Code, Codex and 5 more is on this page, copied from each client's own documentation.

### Claude

```bash
claude mcp add --transport http ca-ccpcrate-ccpcrate 'https://ccpcrate.ca/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "ca-ccpcrate-ccpcrate": {
      "url": "https://ccpcrate.ca/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "ca-ccpcrate-ccpcrate": {
      "type": "http",
      "url": "https://ccpcrate.ca/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.ca-ccpcrate-ccpcrate]
url = "https://ccpcrate.ca/mcp"
```

### opencode

```json
{
  "$schema": "https://opencode.ai/config.json",
  "mcp": {
    "ca-ccpcrate-ccpcrate": {
      "type": "remote",
      "url": "https://ccpcrate.ca/mcp",
      "enabled": true
    }
  }
}
```

### OpenClaw

```bash
openclaw mcp add ca-ccpcrate-ccpcrate --url 'https://ccpcrate.ca/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  ca-ccpcrate-ccpcrate:
    url: "https://ccpcrate.ca/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "ca-ccpcrate-ccpcrate": {
      "Transport": "http",
      "Url": "https://ccpcrate.ca/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add ca-ccpcrate-ccpcrate -t streamable-http -u 'https://ccpcrate.ca/mcp'
```

### Other

```json
{
  "mcpServers": {
    "ca-ccpcrate-ccpcrate": {
      "type": "http",
      "url": "https://ccpcrate.ca/mcp"
    }
  }
}
```

The mcpServers block is a cross-client convention. Remote transports vary, so check your client's docs.

## 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.

### 2026-09-19 (score 62, +1)

No change was recorded against any check on this day. Stability & Change Management went from 33 to 37. That category is still filling its 30-day observation window: 10 days of observed history at the previous scan, 11 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-17 (score 61, +1)

No change was recorded against any check on this day. Stability & Change Management went from 27 to 30. That category is still filling its 30-day observation window: 8 days of observed history at the previous scan, 9 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-15 (score 60, +1)

No change was recorded against any check on this day. Stability & Change Management went from 20 to 23. That category is still filling its 30-day observation window: 6 days of observed history at the previous scan, 7 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-13 (score 59, +1)

No change was recorded against any check on this day. Stability & Change Management went from 13 to 17. That category is still filling its 30-day observation window: 4 days of observed history at the previous scan, 5 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-10 (score 58, +1)

No change was recorded against any check on this day. Stability & Change Management went from 3 to 7. That category is still filling its 30-day observation window: 1 days of observed history at the previous scan, 2 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-09-09 (score 57, 0)

- [functional improvement] Stability: unverified → 0.03

### 2026-09-08 (score 57)

First indexed and scored.

## MCP tools (4)

### `ccpcrate_resolve` (~1007 tokens)

Resolve the CCPC rate stack for one taxation year

Compute the federal Part I / Part IV / refundable / RDTOH / dividend-refund lines and the provincial layer for one CCPC and one taxation year. Returns a readable summary plus the structured result: lines (rounded, as printed), unrounded audit values, facts, warnings, layers, balances carried forward, the inputs still missing, engine and rules versions and a request hash. Deductions are negative, taxes positive. A missing required input is an error, not a default. Paid: 0.25 USD per call in USDC over x402 (Base); without a payment the call returns the x402 payment requirements.

Input parameters:

- `activeBusinessIncome` (number): T2 line 400: income from an active business carried on in Canada
- `aggregateInvestmentIncome` (number): T2 line 440: aggregate investment income (s.129(4))
- `allowableCapitalLosses` (number): Sch 6: allowable capital losses of the year
- `businessLimitAllocated` (number): Business limit allocated to this corporation (Sch 23 line 410 if associated, else the statutory limit). 0 = allocation zero
- `capitalGainsDividends` (number): Capital-gains dividends received (full amount; half to CDA)
- `cdaOpening` (number): Capital dividend account opening balance (returns cda_closing)
- `dividendsPaidEligible` (number): Eligible dividends paid (designated) in the year
- `dividendsPaidNonEligible` (number): Non-eligible taxable dividends paid in the year
- `dividendsPaidOfWhichConnected` (number): How much OF the dividends paid above went to connected corporations — a portion of dividendsPaidEligible + dividendsPaidNonEligible, never an amount on top of them. Raises the cascade warning on the…
- `dividendsReceivedConnected` (array): Dividends from connected corporations (s.186(4)) — Part IV only through the payer's refund
- `dividendsReceivedPortfolioEligible` (number): Eligible taxable dividends from non-connected payers (Part IV → ERDTOH)
- `dividendsReceivedPortfolioNonEligible` (number): Non-eligible taxable dividends from non-connected payers (Part IV → NERDTOH)
- `foreignBusinessTaxCredit` (number): T2 line 636: foreign business income tax credit
- `foreignInvestmentIncome` (number): T2 line 445: foreign investment income
- `foreignNonBusinessTaxCredit` (number): T2 line 632: foreign non-business income tax credit
- `groupAaiiPriorYear` (number): T2 line 417: Σ Sch 7 line 745 of the associated group for taxation years ending in the preceding calendar year. REQUIRED whenever a business limit is claimed
- `lossesByYearOfOrigin` (object): Sch 4 Part 6: opening balances by year of origin, e.g. {"2011": 263564}
- `netIncomeAccounting` (number): Holdco: net income per financial statements
- `netIncomeForTax` (number): Holdco: net income for tax purposes (Sch 1 result) — overrides the derivation
- `nonCapitalLossesClaimedAgainstPartI` (number): Non-capital losses claimed against Part I income
- `nonCapitalLossesClaimedAgainstPartIV` (number): Non-capital / farm losses claimed against Part IV (s.186(1)(c),(d)) — the loss amount
- `nonCapitalLossesOpening` (number): Sch 4: non-capital loss pool at the start of the year
- `otherPropertyIncome` (number): Holdco: property income other than dividends and capital-gains dividends
- `propertyExpenses` (number): Holdco: deductible property expenses of the year (total)
- `province` (string, required): Province of the permanent establishment (two-letter code)
- `provincialProportion` (number): Share of taxable income allocated to the province (Reg. 402). Default 1
- `qc` (object): Québec inputs (CO-771)
- `rdtohOpening` (object): Opening ERDTOH / NERDTOH in T2 terms. Omitted = 0 with a warning when it matters
- `taxYear` (object, required)
- `taxableCapitalGains` (number): Sch 6: taxable capital gains (the included half)
- `taxableCapitalGroupPriorYear` (number): T2 line 415: taxable capital employed in Canada of the group, prior year. Omit when under 10 M
- `taxableIncome` (number): Part I taxable income (T2 line 360). Omit for a holdco and supply the income lines instead; the engine derives it

### `ccpcrate_group` (~270 tokens)

Resolve an associated group

Compute a whole associated group (s.256) in one call: federal line 417 as the sum of the members' prior-year adjusted investment income, the Schedule 23 allocation of the business limit, and every member's return in payer-before-recipient order so that a connected dividend's Part IV under s.186(1)(b) is filled in from the payer's own refund instead of being asked for. Returns each member's lines plus what the grind costs the group and which member causes it — the case a single-corporation computation cannot show. 0.25 USDC covers the group and its first 2 computed members, then 0.05 per additional member, never more than 1. Members that only contribute line 417 are free.

Input parameters:

- `groupAaiiPriorYear` (number): Federal line 417 for the group, when the per-member figures are not available. A member's own input.groupAaiiPriorYear still wins
- `members` (array, required): The associated corporations (s.256). A member with no input still counts toward line 417. Order does not matter — the engine computes payers before recipients
- `taxYear` (object): The group's taxation year, used to read the statutory business limit when no member computes

### `ccpcrate_explain` (~964 tokens)

Explain a resolution

Free diagnostic pass over the same input as ccpcrate_resolve: which layers run, the defaults the engine would apply, every warning with its meaning (grind binding, provincial asymmetries, missing inputs), the rule rows in force for the year with sources and verification status, the open verifications, and what the paid computation would return. Contains no computed amounts — the numbers are in ccpcrate_resolve.

Input parameters:

- `activeBusinessIncome` (number): T2 line 400: income from an active business carried on in Canada
- `aggregateInvestmentIncome` (number): T2 line 440: aggregate investment income (s.129(4))
- `allowableCapitalLosses` (number): Sch 6: allowable capital losses of the year
- `businessLimitAllocated` (number): Business limit allocated to this corporation (Sch 23 line 410 if associated, else the statutory limit). 0 = allocation zero
- `capitalGainsDividends` (number): Capital-gains dividends received (full amount; half to CDA)
- `cdaOpening` (number): Capital dividend account opening balance (returns cda_closing)
- `dividendsPaidEligible` (number): Eligible dividends paid (designated) in the year
- `dividendsPaidNonEligible` (number): Non-eligible taxable dividends paid in the year
- `dividendsPaidOfWhichConnected` (number): How much OF the dividends paid above went to connected corporations — a portion of dividendsPaidEligible + dividendsPaidNonEligible, never an amount on top of them. Raises the cascade warning on the…
- `dividendsReceivedConnected` (array): Dividends from connected corporations (s.186(4)) — Part IV only through the payer's refund
- `dividendsReceivedPortfolioEligible` (number): Eligible taxable dividends from non-connected payers (Part IV → ERDTOH)
- `dividendsReceivedPortfolioNonEligible` (number): Non-eligible taxable dividends from non-connected payers (Part IV → NERDTOH)
- `foreignBusinessTaxCredit` (number): T2 line 636: foreign business income tax credit
- `foreignInvestmentIncome` (number): T2 line 445: foreign investment income
- `foreignNonBusinessTaxCredit` (number): T2 line 632: foreign non-business income tax credit
- `groupAaiiPriorYear` (number): T2 line 417: Σ Sch 7 line 745 of the associated group for taxation years ending in the preceding calendar year. REQUIRED whenever a business limit is claimed
- `lossesByYearOfOrigin` (object): Sch 4 Part 6: opening balances by year of origin, e.g. {"2011": 263564}
- `netIncomeAccounting` (number): Holdco: net income per financial statements
- `netIncomeForTax` (number): Holdco: net income for tax purposes (Sch 1 result) — overrides the derivation
- `nonCapitalLossesClaimedAgainstPartI` (number): Non-capital losses claimed against Part I income
- `nonCapitalLossesClaimedAgainstPartIV` (number): Non-capital / farm losses claimed against Part IV (s.186(1)(c),(d)) — the loss amount
- `nonCapitalLossesOpening` (number): Sch 4: non-capital loss pool at the start of the year
- `otherPropertyIncome` (number): Holdco: property income other than dividends and capital-gains dividends
- `propertyExpenses` (number): Holdco: deductible property expenses of the year (total)
- `province` (string, required): Province of the permanent establishment (two-letter code)
- `provincialProportion` (number): Share of taxable income allocated to the province (Reg. 402). Default 1
- `qc` (object): Québec inputs (CO-771)
- `rdtohOpening` (object): Opening ERDTOH / NERDTOH in T2 terms. Omitted = 0 with a warning when it matters
- `taxYear` (object, required)
- `taxableCapitalGains` (number): Sch 6: taxable capital gains (the included half)
- `taxableCapitalGroupPriorYear` (number): T2 line 415: taxable capital employed in Canada of the group, prior year. Omit when under 10 M
- `taxableIncome` (number): Part I taxable income (T2 line 360). Omit for a holdco and supply the income lines instead; the engine derives it

### `ccpcrate_rules` (~109 tokens)

Rules table

The statutory rates and parameters the engine uses (14 jurisdictions, effective dates, application modes, sources, verification status), filterable by jurisdiction, key and date. Free.

Input parameters:

- `date` (string): Only the rows in force on this date (default: every row, all periods)
- `jurisdiction` (string): Jurisdiction; omit for all
- `key` (string): Row key (e.g. sbd_rate, business_limit, passive_income_grind); omit for all keys

## Diagnostics

Captured diagnostic sections: TLS, DNSSEC, Authorisation, Transports. The full working is on the page: https://verifymcp.io/servers/ca-ccpcrate-ccpcrate/ccpcrate#diagnostics

## Score history

- 2026-09-20: 62
- 2026-09-19: 62
- 2026-09-18: 61
- 2026-09-17: 61
- 2026-09-16: 60
- 2026-09-15: 60
- 2026-09-14: 59
- 2026-09-13: 59
- 2026-09-12: 58
- 2026-09-11: 58
- 2026-09-10: 58
- 2026-09-09: 57
- 2026-09-08: 57

## Common questions

### What is the ccpcrate — Canadian CCPC corporate tax MCP server?

ccpcrate — Canadian CCPC corporate tax is an MCP server listed in the public MCP registry as ca.ccpcrate/ccpcrate. Deterministic Canadian CCPC rate stack: small business deduction and grinds, Part IV, RDTOH. This page covers its hosted endpoint (https://ccpcrate.ca/mcp).

### Is the ccpcrate — Canadian CCPC corporate tax MCP server safe to use?

ccpcrate — Canadian CCPC corporate tax scores 62 out of 100 on VerifyMCP. 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 ccpcrate — Canadian CCPC corporate tax MCP server expose?

ccpcrate — Canadian CCPC corporate tax exposes 4 tools: ccpcrate_resolve, ccpcrate_group, ccpcrate_explain, ccpcrate_rules. Their descriptions and schemas cost roughly 2,350 tokens of context every time the server is loaded.

### Does the ccpcrate — Canadian CCPC corporate tax MCP server require authentication?

No. We connected to ccpcrate — Canadian CCPC corporate tax without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the ccpcrate — Canadian CCPC corporate tax MCP server still maintained?

ccpcrate — Canadian CCPC corporate tax is still listed as active in the MCP registry. We last reached this channel on 20 September 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

## Links

- Remote endpoint: https://ccpcrate.ca/mcp
- Repository: https://github.com/polud/ccpcrate
- Website: https://ccpcrate.ca/
- Changelog RSS feed: https://verifymcp.io/servers/ca-ccpcrate-ccpcrate/ccpcrate.xml
- Changelog JSON feed: https://verifymcp.io/servers/ca-ccpcrate-ccpcrate/ccpcrate.json
- HTML version of this page: https://verifymcp.io/servers/ca-ccpcrate-ccpcrate/ccpcrate