Benefits in kind (BIK) represent a critical element of compensation strategy for any Luxembourg employer. The tax framework governing non-monetary remuneration — principally company vehicles and housing — is undergoing a multi-year reform launched by the Grand-Ducal regulation of 12 May 2022, with transitional rules running through 2027. Getting these valuations right is essential for payroll compliance and effective cost control.

Article 104(2) of the Income Tax Law (L.I.R.) establishes the core principle: every non-cash benefit must be valued at its average market price at the place and time of use. Circular L.I.R. 104/1 of 16 July 2018, supplemented by circular L.I.R. 104/1bis of 4 February 2020, operationalises this rule with standardised methods — including the switch from the NEDC to the WLTP emissions cycle for vehicles.

Whether you are structuring a compensation package for a new SARL, an SA, or a SOPARFI, understanding BIK mechanics directly impacts employer cost, employee net pay, and tax exposure. The sections below cover every rule you need — company cars, housing, salary sacrifice, and record-keeping — with the transition calendar and rates laid out in clear tables.

1. Company car BIK rates and transition calendar

The Grand-Ducal regulation of 12 May 2022 introduced a phased reform with three distinct periods. Each period determines which rate applies based on the contract signature date, the vehicle registration date, and the powertrain type.

1.1. Overview of applicable rates

Period	Electric vehicles	Thermal / Hybrid	Key conditions
Grandfathering	CO₂ scale: 0.5–1.8%	CO₂ scale: 0.5–1.8%	Contract signed ≤ 31/12/2024 and registered ≤ 31/12/2025
2025–2026	0.5% (Route A or B) or 0.6% (other EVs)	2% flat	Contract signed ≤ 31/12/2026 allows registration until 31/12/2027 at 0.5/0.6%
From 01/01/2027	1% (Route A or B) or 1.2% (other EVs)	2% flat	—

Important: Grandfathered vehicles retain the old CO₂ scale until the contract’s natural expiry — no action required from employer or employee, but keep the signed contract and registration certificate on file for audit purposes.

1.2. Electric vehicle efficiency routes (0.5% rate)

The preferential 0.5% rate is accessible via two alternative routes, both measured under the WLTP cycle:

Route	Consumption limit	Power limit	Introduced by
Route A	≤ 18 kWh/100 km	None	GDR 12/05/2022
Route B	≤ 20 kWh/100 km	≤ 150 kW	GDR 08/05/2023

Electric vehicles meeting neither route are taxed at 0.6% (rising to 1.2% from 2027). The dual-route system widens eligibility while keeping energy-efficiency incentives intact.

1.3. Thermal and hybrid vehicles

From 1 January 2025, all thermal and hybrid vehicles are subject to a uniform 2% rate, regardless of CO₂ emissions. This flat rate continues unchanged from 2027, maintaining a clear fiscal gap in favour of electromobility.

2. Calculating the monthly BIK

2.1. Formula

The monthly benefit in kind equals:

Monthly BIK = Vehicle acquisition price (TTC, after discounts) × applicable rate

The acquisition price includes all options and equipment. It remains fixed for the entire provision period, irrespective of market depreciation.

2.2. Worked example

Parameter	Value
Vehicle price (TTC)	€50,000
Consumption (WLTP)	17 kWh/100 km
Power	160 kW
Qualifying route	Route A (≤ 18 kWh, no power cap)
Applicable rate	0.5%
Monthly BIK	€250

A second vehicle consuming 19 kWh/100 km with 140 kW qualifies via Route B and also attracts the 0.5% rate — same €250 monthly BIK. This amount is added to gross salary for income tax and social security purposes every month.

Practical tip: If a contract is signed by 31 December 2026 but the vehicle delivery is delayed, registration can occur until 31 December 2027 while retaining the 0.5% or 0.6% rate — useful given extended EV delivery times.

3. The logbook alternative

Employees who use their company car sparingly for private purposes may opt for the logbook method instead of the flat-rate percentage.

3.1. Requirements

The logbook must record for every journey: date, start and end mileage, destination, and whether the trip is professional or private. The taxable BIK is then:

BIK = Total vehicle cost × (private km ÷ total km)

Total vehicle cost includes depreciation or lease payments, insurance, maintenance, and fuel or electricity.

Important: The tax administration can cross-check logbooks against expense reports, professional calendars, and geolocation data. The burden of proof lies with the taxpayer — incomplete or inconsistent records expose the employee to reassessment at the flat rate.

4. Company housing valuation

Housing provided by the employer is valued differently depending on whether the employer rents or owns the property. In both cases, charges (electricity, water, heating) covered by the employer are added in full.

4.1. Rules at a glance

Situation	Primary rule	Floor / minima	Furnished	Charges
Employer is tenant	Market value; failing that, 25% of unit value	Never < 75% of rent excl. charges	+10%	Added in full
Employer is owner	25% of unit value	€8/m² (studio/apartment) or €7/m² (other)	+10%	Added in full

The “unit value” is an administrative reference assigned by the Direct Tax Administration to each property in Luxembourg. The retained BIK is always the higher of the formula-based calculation and the applicable minimum.

Practical tip: When setting up a company and considering director housing, model the BIK cost early — particularly for furnished accommodation, where the 10% surcharge applies regardless of furniture quality or value.

5. Salary sacrifice

Section 5 of circular L.I.R. 104/1 excludes flat-rate valuation methods whenever an employee accepts a gross salary reduction in exchange for a benefit in kind. Key rules:

• The benefit must be valued at actual market value, not at the flat rate.
• If the market value equals the salary reduction, the transaction is tax-neutral.
• If the employer’s cost exceeds the salary reduction, the difference is a separate taxable benefit.
• Amendments to the employment contract must clearly state both the salary reduction and the benefit value.

Important: The tax administration scrutinises salary sacrifice arrangements closely to prevent artificial optimisation. Robust documentation — signed contract amendments and independent market valuations — is essential.

6. End-of-contract capping

Article 5 of the Grand-Ducal regulation of 23 December 2016 prevents double taxation when an employee purchases the company vehicle at lease end. The total taxable benefit over the entire provision period is capped at the initial price minus the employee’s purchase price. For this calculation, a reference rate of 1.5% is used regardless of the rate actually applied during provision.

6.1. Example

Element	Amount
Vehicle initial value	€40,000
Provision period	36 months
Monthly BIK taxed	€800
Total BIK already taxed	€28,800
Employee purchase price	€15,000
Maximum taxable benefit (€40,000 − €15,000)	€25,000

Since €28,800 already taxed exceeds the €25,000 cap, no additional BIK arises on the purchase — and an adjustment may be due under the regulation.

7. Record-keeping and accounting obligations

Accurate documentation underpins every BIK arrangement. The employment contract must specify whether the benefit is additional to gross salary or included within it, as this determines payroll treatment and total employer cost.

Important: All BIK-related documents — payslips, vehicle invoices, lease contracts, logbooks, housing valuations, and calculation workbooks — must be retained for 10 years in line with Luxembourg accounting retention rules.

Companies managing multiple BIK regimes simultaneously (grandfathered vehicles alongside new contracts) should maintain a fleet register cross-referencing each vehicle’s contract date, registration date, and applicable rate to streamline audit responses.