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fiscaliste

Calculate Luxembourg personal income tax using IRPP tax classes and the 2025 progressive barème.

11|Updated May 9, 2026
Search Tags:#deductions#credits#luxembourg#irpp#tax class#frontaliers#rt s
One-click install
npx skills add https://github.com/gregherbe76/Luxembourg-Paperasse --skill fiscaliste-gregherbe76
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: fiscaliste
Source: https://github.com/gregherbe76/Luxembourg-Paperasse/tree/main/fiscaliste
Command: npx skills add https://github.com/gregherbe76/Luxembourg-Paperasse --skill fiscaliste-gregherbe76

SYSTEM DOCUMENTATION & REQUIREMENTS

💡 This Skill includes references (resource) components.

What problem does it solve?

It helps you determine Luxembourg personal income tax (IRPP) for individuals by correctly applying tax classes, progressive tax rates, deductions, and credits, including special handling for cross-border workers (frontaliers).

Core Features & Use Cases

  • Tax class selection (1 / 1a / 2) with guardrails for residence status, family situation, and child-related rules (including the 2018 reforms for couples).
  • IRPP computation workflow for common profiles: salary (RTS with annual adjustment), pensions, investment income, and key fiscal mechanisms like splitting for class 2.
  • Frontaliers (non-residents/assimilated residents) guidance using Luxembourg tax treatment and treaty-specific telework tolerances, including the assimilation-to-resident process and related thresholds.
  • Optimization checks for lawful levers such as deductions (e.g., mortgage interest limits, PER, insurance premiums, pension schemes) and credits (e.g., CIS/CIM, boni pour enfant), plus common error prevention.

Quick Start

Calculate my Luxembourg IRPP for year 2025 by telling me my tax class (1/1a/2), residency and nationality, family situation with children (ages), and income breakdown (salary and any other income), including whether I am a cross-border worker and the number of telework days.

Frequently Asked Questions about fiscaliste

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I calculate my Luxembourg personal income tax for 2025?▼

The IRPP computation applies the progressive barème to your income based on your assigned tax class, incorporating mechanisms like class 2 splitting, eligible deductions, and tax credits to produce the final liability.

How are tax classes 1, 1a, and 2 selected for Luxembourg IRPP?▼

Tax class selection depends on your residency status, family situation, and dependent children, applying guardrails that include the 2018 reforms for couples to accurately determine your class 1, 1a, or 2 status.

How does Luxembourg tax calculation work for cross-border frontaliers?▼

For cross-border frontaliers, the calculation applies treaty-specific telework tolerances and assimilation-to-resident thresholds, requiring your residency status and telework days to determine the correct non-resident tax treatment.

Can I deduct mortgage interest and insurance premiums from Luxembourg income tax?▼

Yes, you can reduce your taxable income through lawful deductions like mortgage interest limits, PER, insurance premiums, and pension schemes, alongside applying tax credits such as CIS/CIM and boni pour enfant.

What income sources are supported for Luxembourg tax computation?▼

The computation supports salary (RTS with annual adjustment), pensions, investment income, and real estate related taxation scenarios, applying the progressive barème and class-specific mechanisms to each income source.

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