Jock Taxes for ChatGPT

Calculate NHL tax

calculate_nhl_tax

Calculate professional-athlete tax for one NHL season with the Jock Taxes engine. Ask the user for a missing team or salary. Do not invent team codes, seasons, salaries, or filing status. Call list_tax_calculator_inputs for allowed values. Send salary when the user has one season total taxed entirely as duty-day pay. Send base_salary plus optional signing_bonus and performance_bonus to match the site Salary + Bonuses form. Do not send salary together with base_salary or a bonus. exempt_signing_bonus_from_jock_tax defaults to true for a split, so the signing bonus is taxed only in the player's domicile. performance_bonus is included only when include_performance_bonus_in_jock_tax is true. art_xvi4_inducement_sb applies to an exempt signing bonus paid by a Canadian club to a U.S. resident. Present the result as a calculation, not as tax or legal advice. Required before this call: team, and salary or base_salary. Match a player with list_team_players only after league, team, and season_id are known. Repeat inputs and defaults from the result in the reply. Results are income tax only unless the user asks for take-home: then send include_payroll_taxes, agent_fee_pct, retirement_contribution (401(k), or RRSP on a Canadian club) or rca_contribution (Canadian clubs), and report result.net_pay. Comparisons then match on net_pay.net_economic, which counts an RCA after its estimated payout tax (rca_payout_tax_rate; default 25% Canadian withholding on the US-duty-day share and the US federal marginal rate on the rest, or 25% on all of it for a US person).

Input Schema

Name	Required	Description
`team`	Yes	Team code, such as BOS.
`salary`	No	One season total in whole dollars, taxed entirely as duty-day pay. Leave this out when sending base_salary.
`season_id`	No	Schedule season as eight digits, such as 20252026. Defaults to the latest season for the league when omitted.
`base_salary`	No	Duty-day base in whole dollars before signing and performance bonuses. Send this with the bonus fields to match Salary + Bonuses. Leave it out when sending salary.
`agent_fee_pct`	No	Agent fee as a percent of gross pay (0-10), treated as a non-deductible cost. Default 0.
`birth_country`	No	Birth country code used with is_us_person.
`filing_status`	No	Single or Married_Joint. Defaults to Single when omitted.
`signing_bonus`	No	Signing bonus in whole dollars. The site adds this into the season total. On NFL it also includes other inducement pay.
`contract_season`	No	Contract season label, such as 2025-26.
`primary_domicile`	No	Resident tax home: a state, a city, or a mode such as local_jurisdiction. Defaults to local_jurisdiction when omitted.
`rca_contribution`	No	Salary deferred into a Retirement Compensation Arrangement by a Canadian club, in USD. Excluded from Canadian employment income until paid out: from worldwide income for a Canadian resident and in full from Canadian-source pay for a non-resident (Martin v. The King, 2024 TCC 153). US tax is unchanged. Not applied for US clubs. Comparisons count it after the estimated tax at payout (see rca_payout_tax_rate). Default 0.
`performance_bonus`	No	Performance bonus in whole dollars. Included in the total only when include_performance_bonus_in_jock_tax is true.
`rca_payout_tax_rate`	No	Estimated tax on the RCA when it is paid out, as a percent (0-100). Default models a player who retires to a no-tax US state and draws the RCA and its refundable tax account down at once: the US-duty-day share, already taxed by the US when contributed, bears Canada's 25% non-resident withholding, and the rest bears the US federal marginal rate on it (37% for a high earner). For a US person, who pays US tax on the whole contribution now, the default is the 25% withholding alone. Lowers net_pay.net_economic, which comparisons match on.
`retirement_catch_up`	No	none (default), 50_plus (+$8,000) or 60_to_63 (+$11,250). Catch-up contributions are always Roth for athletes (prior-year FICA wages over $150,000).
`include_payroll_taxes`	No	Opt in to employee payroll taxes for each team's employer: FICA (Social Security, Medicare, Additional Medicare) and the home state's disability or paid-leave levy for US clubs; CPP/QPP, EI and QPIP for Canadian clubs. Default false. For a Canadian resident it also applies the CPP/QPP and EI credits and the enhanced CPP/QPP deduction on the Canadian return. With any take-home option set, the response adds net_pay (net = cash take-home, net_economic = net plus the 401(k) deferral), agent_fee, retirement_contribution, and payroll_taxes when payroll is on. amounts.total stays income tax only.
`art_xvi4_inducement_sb`	No	Opt in to Canada–U.S. Treaty Art. XVI(4) on an exempt signing bonus from a Canadian club.
`estimated_playoff_games`	No	Extra postseason games. Use 0 when there are none.
`retirement_contribution`	No	Annual retirement contribution in USD. On a US club it is a 401(k) elective deferral capped at the 2026 limit ($24,500 plus catch-up). On a Canadian club it is an RRSP contribution capped at C$33,810, deducted from Canadian taxable income only. Default 0.
`retirement_contribution_type`	No	401(k) only: pretax (default) lowers income-tax wages except in Pennsylvania, Philadelphia, Pittsburgh, Ohio cities, Kansas City and St. Louis; roth lowers nothing. RRSP contributions are always deductible.
`exempt_signing_bonus_from_jock_tax`	No	When true, the signing bonus is taxed in the player's domicile and left out of duty-day allocation.
`include_performance_bonus_in_jock_tax`	No	When true, performance_bonus is part of the season total and of duty-day pay.

Output Schema

Name	Required	Description	Default
`sport`	Yes
`inputs`	Yes
`result`	Yes
`defaults`	Yes
`disclaimer`	Yes

Schema Changelog

Changes observed during successful MCP inspections.

Changed7 schema fields changedOct 26, 2026

addedInput schema / properties / agent_fee_pct

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Agent fee as a percent of gross pay (0-10), treated as a non-deductible cost. Default 0.",
+  "title": "Agent Fee Pct"
+}

addedInput schema / properties / include_payroll_taxes

Added value: +{
+  "anyOf": [
+    {
+      "type": "boolean"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Opt in to employee payroll taxes for each team's employer: FICA (Social Security, Medicare, Additional Medicare) and the home state's disability or paid-leave levy for US clubs; CPP/QPP, EI and QPIP for Canadian clubs. Default false. For a Canadian resident it also applies the CPP/QPP and EI credits and the enhanced CPP/QPP deduction on the Canadian return. With any take-home option set, the response adds net_pay (net = cash take-home, net_economic = net plus the 401(k) deferral), agent_fee, retirement_contribution, and payroll_taxes when payroll is on. amounts.total stays income tax only.",
+  "title": "Include Payroll Taxes"
+}

addedInput schema / properties / rca_contribution

Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Salary deferred into a Retirement Compensation Arrangement by a Canadian club, in USD. Excluded from Canadian employment income until paid out: from worldwide income for a Canadian resident and in full from Canadian-source pay for a non-resident (Martin v. The King, 2024 TCC 153). US tax is unchanged. Not applied for US clubs. Comparisons count it after the estimated tax at payout (see rca_payout_tax_rate). Default 0.",
+  "title": "Rca Contribution"
+}

addedInput schema / properties / rca_payout_tax_rate

Added value: +{
+  "anyOf": [
+    {
+      "type": "number"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Estimated tax on the RCA when it is paid out, as a percent (0-100). Default models a player who retires to a no-tax US state and draws the RCA and its refundable tax account down at once: the US-duty-day share, already taxed by the US when contributed, bears Canada's 25% non-resident withholding, and the rest bears the US federal marginal rate on it (37% for a high earner). For a US person, who pays US tax on the whole contribution now, the default is the 25% withholding alone. Lowers net_pay.net_economic, which comparisons match on.",
+  "title": "Rca Payout Tax Rate"
+}

addedInput schema / properties / retirement_catch_up

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "none (default), 50_plus (+$8,000) or 60_to_63 (+$11,250). Catch-up contributions are always Roth for athletes (prior-year FICA wages over $150,000).",
+  "title": "Retirement Catch Up"
+}

addedInput schema / properties / retirement_contribution

Added value: +{
+  "anyOf": [
+    {
+      "type": "integer"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "Annual retirement contribution in USD. On a US club it is a 401(k) elective deferral capped at the 2026 limit ($24,500 plus catch-up). On a Canadian club it is an RRSP contribution capped at C$33,810, deducted from Canadian taxable income only. Default 0.",
+  "title": "Retirement Contribution"
+}

addedInput schema / properties / retirement_contribution_type

Added value: +{
+  "anyOf": [
+    {
+      "type": "string"
+    },
+    {
+      "type": "null"
+    }
+  ],
+  "default": null,
+  "description": "401(k) only: pretax (default) lowers income-tax wages except in Pennsylvania, Philadelphia, Pittsburgh, Ohio cities, Kansas City and St. Louis; roth lowers nothing. RRSP contributions are always deductible.",
+  "title": "Retirement Contribution Type"
+}

First observedOct 22, 2026

TDQS

A4.5/5.0

Behavior4/5

Does the description disclose side effects, auth requirements, rate limits, or destructive behavior?

Annotations only declare readOnlyHint=false, destructiveHint=false and openWorldHint=false, so the description must supply the meaning, and it does: results are income tax only unless payroll options are sent, default behavior of exempt_signing_bonus_from_jock_tax for a split, and a framing instruction ("Present the result as a calculation, not as tax or legal advice"). It never states whether the call persists anything or what happens on invalid combos beyond the mutual-exclusion rule, leaving a small gap.

Agents need to know what a tool does to the world before calling it. Descriptions should go beyond structured annotations to explain consequences.

Conciseness3/5

Is the description appropriately sized, front-loaded, and free of redundancy?

Front-loaded with purpose and prerequisites, but it runs to roughly 300 words in long unbroken sentences, and the closing net_pay / rca_payout_tax_rate material largely restates the rca_payout_tax_rate schema description and output-schema content. A tool this conditional justifies length, but the redundancy and density cost it.

Shorter descriptions cost fewer tokens and are easier for agents to parse. Every sentence should earn its place.

Completeness5/5

Given the tool's complexity, does the description cover enough for an agent to succeed on first attempt?

For a 21-parameter, output-schema-backed calculator, the description covers the full workflow: gather inputs, validate against list_tax_calculator_inputs, choose salary vs base_salary+bonuses, then extend to take-home with payroll/agent/retirement fields. Nothing an agent needs in order to invoke it correctly is absent.

Complex tools with many parameters or behaviors need more documentation. Simple tools need less. This dimension scales expectations accordingly.

Parameters4/5

Does the description clarify parameter syntax, constraints, interactions, or defaults beyond what the schema provides?

Schema coverage is 100%, so baseline would be 3, but the description adds cross-field logic the schema states only per-field: salary is mutually exclusive with base_salary/bonuses, performance_bonus counts only when include_performance_bonus_in_jock_tax is true, and art_xvi4_inducement_sb is conditioned on a Canadian club paying an exempt bonus to a U.S. resident. That is genuine conditional routing rather than restatement.

Input schemas describe structure but not intent. Descriptions should explain non-obvious parameter relationships and valid value ranges.

Purpose5/5

Does the description clearly state what the tool does and how it differs from similar tools?

Opens with a specific verb+resource+scope: "Calculate professional-athlete tax for one NHL season with the Jock Taxes engine." The league qualifier, plus the named engine, lets an agent separate it from calculate_mlb_tax / calculate_nba_tax / calculate_nfl_tax without opening a schema.

Agents choose between tools based on descriptions. A clear purpose with a specific verb and resource helps agents select the right tool.

Usage Guidelines5/5

Does the description explain when to use this tool, when not to, or what alternatives exist?

Explicit when-to-use rules with alternatives named: call list_tax_calculator_inputs for allowed values, match players with list_team_players only after league/team/season_id are known, and prerequisites stated ("Required before this call: team, and salary or base_salary"). It also gives an anti-pattern ("Do not invent team codes, seasons, salaries, or filing status") and routes to a take-home mode when the user asks for it.

Agents often have multiple tools that could apply. Explicit usage guidance like "use X instead of Y when Z" prevents misuse.

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