# Tallyfern Rates (Canada) (remote · mcp.tallyfern.com)

Read-only Canadian GST/HST rates, small-supplier check and CRA allowance rates, with CRA sources.

- Trust score: 83/100 (high trust)
- Change this week: +1
- Registry status: active
- Liveness: live
- Owner verified: no
- Last scored: 2026-11-06

## Components

- remote · `mcp.tallyfern.com`: 83/100 (this document), [markdown](https://verifymcp.io/servers/com-tallyfern-rates/mcp.md), [page](https://verifymcp.io/servers/com-tallyfern-rates/mcp)

## Channel facts

- Endpoint: `https://mcp.tallyfern.com/mcp`
- Transports: `streamable-http`
- Auth: `none`
- Version: `0.3.4`

## 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 2026-11-06.

- **Endpoint Security**: 69/100
  - The endpoint's TLS certificate is valid, in date, and uses a strong key.
  - No authorisation is required to call this server. Nothing on it is marked destructive, but we can't show that an anonymous caller can only read: full credit needs the server to list at least one tool and every tool to be verifiably read-only. We use a best-effort check of tool names and descriptions to tell read-only tools from tools that change things, so some genuinely read-only tools may not get full credit. Names that start with a read verb (get, list, read, search and similar) and accurate readOnlyHint annotations help. Meet that to earn full credit, or require authorisation.
  - HTTPS enforcement could not be verified: the plaintext port answered with HTTP 405, which proves neither a plaintext path nor enforcement.
  - The HSTS (Strict-Transport-Security) header is present.
  - 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**: 74/100
  - AI-judged instruction clarity (excellent).
  - Context-footprint check failed: tool/resource definitions use about 771 tokens (~154/item across 5 items; 5 tools + 0 resources), over budget; trim descriptions and params.
  - Usage-examples check failed: none of the tools include examples.
- **Stability & Change Management**: 100/100
  - No destabilizing schema changes in the last 30 days.
- **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.
  - Structured output schemas are declared (100% of tools); any adoption earns full credit.
- **Tool Safety**: 100/100
  - No prompt-injection markers were found in the server instructions, tool names or descriptions we captured.
  - We read all 5 captured tool definition(s), and no name or description among them implies an irreversible operation.
  - An AI judge read all 6 captured unit(s) of tool text and found none that tries to manipulate the model reading it.
- **Capabilities**: 100/100
  - Implements a supported MCP spec version (2025-11-25); the latest is 2026-07-28.

## Install

### How do I install the Tallyfern Rates (Canada) MCP server?

Tallyfern Rates (Canada) is a hosted endpoint at https://mcp.tallyfern.com/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 com-tallyfern-rates 'https://mcp.tallyfern.com/mcp'
```

### Cursor

```json
{
  "mcpServers": {
    "com-tallyfern-rates": {
      "url": "https://mcp.tallyfern.com/mcp"
    }
  }
}
```

### VS Code

```json
{
  "servers": {
    "com-tallyfern-rates": {
      "type": "http",
      "url": "https://mcp.tallyfern.com/mcp"
    }
  }
}
```

### Codex

```toml
[mcp_servers.com-tallyfern-rates]
url = "https://mcp.tallyfern.com/mcp"
```

### opencode

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

### OpenClaw

```bash
openclaw mcp add com-tallyfern-rates --url 'https://mcp.tallyfern.com/mcp' --transport streamable-http
```

### Hermes

```yaml
mcp_servers:
  com-tallyfern-rates:
    url: "https://mcp.tallyfern.com/mcp"
```

### Netclaw

```json
{
  "McpServers": {
    "com-tallyfern-rates": {
      "Transport": "http",
      "Url": "https://mcp.tallyfern.com/mcp"
    }
  }
}
```

### Vellum

```bash
assistant mcp add com-tallyfern-rates -t streamable-http -u 'https://mcp.tallyfern.com/mcp'
```

### Other

```json
{
  "mcpServers": {
    "com-tallyfern-rates": {
      "type": "http",
      "url": "https://mcp.tallyfern.com/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.

### 2026-11-06 (score 83, 0)

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

### 2026-11-02 (score 83, 0)

- [security] Stability: 0.97 → pass

### 2026-11-01 (score 83, +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.

### 2026-10-30 (score 82, +1)

No change was recorded against any check on this day. Stability & Change Management went from 87 to 90. That category is still filling its 30-day observation window: 26 days of observed history at the previous scan, 27 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-28 (score 81, +1)

- [functional] Server version: 0.3.2 → 0.3.3

### 2026-10-26 (score 80, +1)

No change was recorded against any check on this day. Stability & Change Management went from 73 to 77. That category is still filling its 30-day observation window: 22 days of observed history at the previous scan, 23 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-24 (score 79, +1)

No change was recorded against any check on this day. Stability & Change Management went from 67 to 70. That category is still filling its 30-day observation window: 20 days of observed history at the previous scan, 21 at this one. The score rises as the window fills, whether or not the server changes.

### 2026-10-23 (score 78, 0)

- [security] Tool “cra_automobile_allowance_rate” rewrote its description, which is the text the model reads
- [security] Tool “cra_meal_travel_allowance” rewrote its description, which is the text the model reads
- [security] Tool “gst_hst_rate_by_province” rewrote its description, which is the text the model reads
- [security] Tool “gst_hst_small_supplier_check” rewrote its description, which is the text the model reads
- [security] Tool “ontario_hst_basics” rewrote its description, which is the text the model reads
- [functional regression] Schema quality: 122 → 154
- [functional] Server version: 0.3.0 → 0.3.2

## MCP tools (5)

### `gst_hst_small_supplier_check` (~165 tokens)

GST/HST small supplier ($30,000) check

Apply the CRA's $30,000 small-supplier tests (single calendar quarter and four consecutive calendar quarters) to taxable revenue by calendar quarter. Says whether the person must register for the GST/HST, when they stop being a small supplier, the effective date of registration, and headroom for next quarter. Most businesses only (not charities/public service bodies). Returns structuredContent with status, headline, the triggering quarter (or null), per-quarter rolling totals, next-quarter headroom, sources and an as-of date.

Input parameters:

- `quarters` (array, required): Consecutive calendar quarters, no gaps (use 0 for quarters with no sales).
- `taxiOrRideshare` (boolean): True if self-employed taxi or commercial ride-sharing driver (must register regardless).

Output parameters:

- `asOf` (string): Date the rules were last verified
- `currency` (string): Currency of all amounts: Canadian dollars
- `dataVersion` (string): Version of the Tallyfern Rates dataset, e.g. 2026.10.03
- `disclaimer` (string): Not-tax-advice notice
- `explanation` (array): Short plain-language points explaining the result
- `headline` (string): One-sentence answer
- `latest` (object): Summary for the most recent quarter given
- `nextQuarter` (object): The quarter after the latest one given, with remaining headroom
- `quarters` (array): Each quarter checked, oldest first
- `relatedLink` (string): Related free Tallyfern tool or page
- `rule` (string): Identifier of the rule set applied (ca-gst-hst-small-supplier)
- `ruleVersion` (string): Version of that rule set, e.g. 1.0.0
- `sources` (array): Official canada.ca pages used for this answer
- `status` (string): Result of the small-supplier tests
- `threshold` (number): Small-supplier threshold (30000)
- `trigger`: The first quarter that triggered registration, or null

### `gst_hst_rate_by_province` (~115 tokens)

GST/HST and PST rates by province

Current GST/HST rate for a Canadian province or territory (or all 13), with the PST/QST rate CRA lists for reference. From CRA's 'Charge and collect the GST/HST' table. Returns structuredContent with one rate row (or all 13), the effective-from date, notes, the canada.ca source and an as-of date.

Input parameters:

- `province` (string): Province or territory code or name, e.g. "ON", "Ontario", "QC", "Yukon".

Output parameters:

- `asOf` (string): Date (YYYY-MM-DD) the figures were last checked against the source pages
- `dataVersion` (string): Version of the Tallyfern Rates dataset, e.g. 2026.10.03
- `disclaimer` (string): Not-tax-advice notice
- `effectiveFrom` (string): Rates effective on or after this date
- `notes` (array): Caveats: place of supply, zero-rated/exempt supplies, PST shown for reference
- `rate` (object): The requested province or territory (when one was given)
- `rates` (array): All 13 provinces and territories (when no province was given)
- `relatedLink` (string): Related free Tallyfern tool or page
- `source` (object): Official source for these figures

### `cra_automobile_allowance_rate` (~167 tokens)

CRA per-km automobile allowance rate

CRA reasonable per-kilometre allowance rates for employer-paid vehicle allowances (2026 default; 2025 also available): first 5,000 km and after, provinces vs territories. Optionally calculates the allowance for a number of business kilometres. Returns structuredContent with the per-km rates for provinces and territories, the rates for the given region, an optional tiered calculation, the source and an as-of date.

Input parameters:

- `kilometres` (number): Business kilometres in the calendar year, to calculate an allowance.
- `province` (string): Province or territory code or name, e.g. "ON", "Ontario", "QC", "Yukon".
- `year` (number): Calendar year (2026 or 2025). Default 2026.

Output parameters:

- `applicable` (object): Rates that apply to the given province or territory
- `asOf` (string): Date (YYYY-MM-DD) the figures were last checked against the source pages
- `calculation` (object): Allowance for the given kilometres
- `currency` (string): Currency of all amounts: Canadian dollars
- `dataVersion` (string): Version of the Tallyfern Rates dataset, e.g. 2026.10.03
- `disclaimer` (string): Not-tax-advice notice
- `rates` (object): CRA per-km allowance rates for that year
- `region` (object): The province or territory given, if any
- `relatedLink` (string): Related free Tallyfern tool or page
- `scope` (string): Who these rates are for (employer allowances to employees) and who they are not for
- `source` (object): Official source for these figures
- `territoryExtraPerKm` (number): Extra $ per km for the territories over the provincial rate
- `year` (integer): Year the per-km rates apply to (2026 or 2025)

### `cra_meal_travel_allowance` (~168 tokens)

CRA simplified meal and vehicle rates

CRA simplified-method rates (latest published tax year): flat meal rate per meal and maximum per day, and vehicle cents/km by province or territory where travel begins. These apply to moving expenses, northern residents deductions and medical travel, not to employer per-diems. Optionally calculates amounts. Returns structuredContent with the tax year, meal rates, vehicle cents/km (one province or all), optional vehicle and meal amounts, scope notes, the source and an as-of date.

Input parameters:

- `days` (integer): Number of days (caps meals at the daily maximum).
- `kilometres` (number): Kilometres driven, to calculate a vehicle amount (needs province).
- `meals` (integer): Number of meals.
- `province` (string): Province or territory where the travel begins.

Output parameters:

- `asOf` (string): Date (YYYY-MM-DD) the figures were last checked against the source pages
- `dataVersion` (string): Version of the Tallyfern Rates dataset, e.g. 2026.10.03
- `disclaimer` (string): Not-tax-advice notice
- `latestPublishedNote` (string): Which tax year the CRA page showed as of the check date
- `mealAmount` (object): Meal amount (when meals or days were given)
- `meals` (object): Simplified-method meal rates
- `region` (object): Province or territory where travel begins, if given
- `relatedLink` (string): Related free Tallyfern tool or page
- `scope` (string): What these rates apply to (moving expenses, northern residents deductions, medical travel) and what they don't
- `source` (object): Official source for these figures
- `taxYear` (integer): Tax year of the simplified rates returned (latest published on the CRA page)
- `vehicleAmount` (number): Kilometres × cents per km, converted to CAD dollars (when kilometres and province were given)
- `vehicleCentsPerKm` (number): Cents per km for the province where travel begins
- `vehicleCentsPerKmByProvince` (object): Cents per km by province code (when no province was given)

### `ontario_hst_basics` (~79 tokens)

Ontario HST basics

Plain-language basics for Ontario businesses: the 13% HST rate, the $30,000 small-supplier threshold, the 29-day registration deadline and place-of-supply rule, with CRA sources. Returns structuredContent with the Ontario rate row, the threshold, the registration deadline in days, sources and an as-of date.

Output parameters:

- `asOf` (string): Date (YYYY-MM-DD) the figures were last checked against the source pages
- `dataVersion` (string): Version of the Tallyfern Rates dataset, e.g. 2026.10.03
- `disclaimer` (string): Not-tax-advice notice
- `province` (string): Always ON (Ontario)
- `rate` (object): Ontario's HST rate row from CRA's table
- `registerWithinDays` (integer): Days to register after the effective date of registration (29)
- `relatedLink` (string): Related free Tallyfern tool or page
- `smallSupplierThreshold` (number): Small-supplier threshold (30000)
- `sources` (array): Official canada.ca pages used for this answer

## Diagnostics

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

## Score history

- 2026-11-06: 83
- 2026-11-05: 83
- 2026-11-04: 83
- 2026-11-03: 83
- 2026-11-02: 83
- 2026-11-01: 83
- 2026-10-31: 82
- 2026-10-30: 82
- 2026-10-29: 81
- 2026-10-28: 81
- 2026-10-27: 80
- 2026-10-26: 80
- 2026-10-25: 79
- 2026-10-24: 79
- 2026-10-23: 78
- 2026-10-22: 78
- 2026-10-21: 78
- 2026-10-20: 78
- 2026-10-19: 77
- 2026-10-18: 77
- 2026-10-17: 76
- 2026-10-16: 76
- 2026-10-15: 75
- 2026-10-14: 75
- 2026-10-13: 74
- 2026-10-12: 74
- 2026-10-11: 73
- 2026-10-10: 73
- 2026-10-08: 72
- 2026-10-05: 71

## Common questions

### What is the Tallyfern Rates (Canada) MCP server?

Tallyfern Rates (Canada) is an MCP server listed in the public MCP registry as com.tallyfern/rates. Read-only Canadian GST/HST rates, small-supplier check and CRA allowance rates, with CRA sources. This page covers its hosted endpoint (https://mcp.tallyfern.com/mcp).

### Is the Tallyfern Rates (Canada) MCP server safe to use?

Tallyfern Rates (Canada) scores 83 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 Tallyfern Rates (Canada) MCP server expose?

Tallyfern Rates (Canada) exposes 5 tools: gst_hst_small_supplier_check, gst_hst_rate_by_province, cra_automobile_allowance_rate, cra_meal_travel_allowance, ontario_hst_basics. Their descriptions and schemas cost roughly 694 tokens of context every time the server is loaded.

### Does the Tallyfern Rates (Canada) MCP server require authentication?

No. We connected to Tallyfern Rates (Canada) without credentials and it answered, so anything it exposes is reachable by anyone who knows the address.

### Is the Tallyfern Rates (Canada) MCP server still maintained?

Tallyfern Rates (Canada) is still listed as active in the MCP registry. We last reached this channel on 6 November 2026. Those dates come from our own scans of the registry and the channel itself, not from anything the publisher announced.

### What did VerifyMCP test on the Tallyfern Rates (Canada) MCP server?

VerifyMCP ran 12 checks on Tallyfern Rates (Canada), covering TLS certificate, Authorization, HSTS header, DNSSEC and 8 more. One item could not be completed, a gap on our side rather than a finding about Tallyfern Rates (Canada): HTTPS. Supply Chain Security and Provenance & Transparency do not apply to a hosted endpoint, so they were not tested. The score does not measure everything, and the scoring documentation lists what it leaves out.

## Links

- Remote endpoint: https://mcp.tallyfern.com/mcp
- Website: https://tallyfern.com/
- Changelog RSS feed: https://verifymcp.io/servers/com-tallyfern-rates/mcp.xml
- Changelog JSON feed: https://verifymcp.io/servers/com-tallyfern-rates/mcp/changelog.json
- Trust report (JSON): https://verifymcp.io/servers/com-tallyfern-rates/mcp.json
- HTML version of this page: https://verifymcp.io/servers/com-tallyfern-rates/mcp