Mortgage interest

How much of your mortgage interest is tax-deductible?

Please specify your household situation and the date of completion of your main residence: we will calculate your deduction limit straight away.

Provide the following two details:

Household

Number of children

Date of availability of your main property

The availability date is the moment your property became ready to be lived in, with heating, basic sanitary facilities, a kitchen area and a habitable room, even if you only moved in later. For a new construction, it is the handover of the keys. The availability date is therefore the date on which you could actually move into the property, and it remains decisive for calculating the deductible interest limit.

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Simulator – Mortgage interest deduction for your main residence

When you take out a mortgage for your main residence in Luxembourg, the debit interest you pay is deductible up to an annual limit. This limit depends on the date your property became available for use and on the size of your household.

Why use this mortgage interest deduction simulator?

find out the maximum debit interest you can deduct for your main residence,
account for your household and your number of children,
anticipate the tax impact of your mortgage on your Luxembourg tax return.

What is the deductible interest limit per person?

The deductible ceiling applies per person in the household (the taxpayer, their spouse or partner in the case of joint taxation, and each dependent child). It depends on the date your main residence became available:

After 31/12/2023: interest is fully deductible (no ceiling).
Between 31/12/2019 and 01/01/2024: 4.000€ per person.
Between 31/12/2014 and 01/01/2020: 3.000€ per person.
Before 01/01/2015: 2.000€ per person.

For example, a married couple with one child whose property became available in 2021 can deduct up to 12.000€ (4.000€ × 3 persons).

Frequently asked questions:

What counts as the availability date?

It is the moment your property became ready to be lived in (heating, basic sanitary facilities, a kitchen area and a habitable room), even if you only moved in later. For a new construction, it is the handover of the keys.

How is the household size counted?

Count one person if you are single or two if you are married or in a partnership taxed jointly, plus each dependent child. The per-person ceiling is then multiplied by this number.

What if my property became available after 31/12/2023?

In that case the debit interest on your main residence is fully deductible, and your household size does not change the result.

Estimate your deductible mortgage interest in just a few clicks and prepare your tax return with peace of mind.