MaCalculatriceEnLigne

calculate_belgian_income_tax

Calculate Belgian personal income tax (IPP/PB) using 2026 progressive brackets. Returns: {income, tax_free_amount, taxable_base, income_tax, effective_rate_pct, marginal_rate_pct, ...}. See list_bundles for related 'finance-belgique' calculators.

Input Schema

TableJSON Schema

Name	Required	Description	Default
`income`	Yes	Annual taxable income in euros

Output Schema

TableJSON Schema

Name	Required	Description
`result`	No	Computed result. Object whose fields depend on the tool (e.g. {tax, marginal_rate, brackets} for tax tools, {volume_l, gallons} for volume tools).
`source`	No	Authoritative source for the rule or formula (e.g. "Article 197 CGI", "NF DTU 21").
`formula`	No	Human-readable formula or method used (e.g. "I=P·r·t", "Magnus formula").
`reference_url`	No	Link to a calcul2 page documenting the calculation in detail.

Schema Changelog

Changes observed during successful MCP inspections.

First observedJul 13, 2026

TDQS

A3.8/5.0

Behavior3/5

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

No annotations are provided, so the description carries the full burden. The description does not disclose behavioral traits such as idempotency or side effects, but since it's a pure calculation, minimal disclosure is acceptable. No contradiction with annotations.

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

Conciseness5/5

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

Two sentences: first states purpose and output, second directs to related tools. No unnecessary words; front-loaded with essential information.

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

Completeness4/5

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

Given the complexity of Belgian income tax, the description specifies the tax year and output fields. With an output schema present, the description does not need to detail return values. Could mention assumptions (e.g., deductions), but overall adequate.

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

Parameters3/5

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

The input schema has 100% coverage with a description for 'income' ('Annual taxable income in euros'). The tool description adds no additional meaning beyond this, so baseline score of 3 is appropriate.

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?

The description clearly states the verb 'Calculate', the resource 'Belgian personal income tax (IPP/PB)', and specifies 'using 2026 progressive brackets'. It distinguishes itself from sibling tax calculators by the country and acronym.

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

Usage Guidelines3/5

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

The description directs users to 'list_bundles' for related calculators, implying a context but not explicitly stating when to use this tool versus alternatives like other Belgian tax tools. No when-not or exclusion criteria are provided.

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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