How Luxembourg taxes your savings, dividends and share gains — and the six-month rule that matters most

Luxembourg treats the three main kinds of investment return completely differently. Interest is taxed at a flat 20% deducted at source and then forgotten about. Half of a qualifying dividend is exempt, and the rest is taxed at your ordinary rate. And a gain on shares held for more than six months is, for most private investors, not taxed at all.

That last rule is unusually generous by European standards, and it is the one that shapes how portfolios are actually managed here.

Interest: 20%, final, and a threshold that behaves like a cliff

Under the RELIBI regime, interest paid to a Luxembourg-resident individual by a Luxembourg paying agent is subject to a 20% withholding which constitutes definitive taxation. You do not declare it, and it does not push your other income up the scale. For a higher-rate taxpayer that is a substantially better outcome than the progressive scale would produce.

The regime covers bonified interest on accounts with credit institutions — savings, sight and time deposits — and interest on bonds. It does not cover:

• Interest on current or sight accounts not exceeding an annual rate of 0.75%.
• Returns from collective investment funds.
• Housing savings accounts.
• Securities that were not publicly issued.

The €250 trap

A small-deposit exemption covers up to €250 of annual interest per person per paying agent. It is critical to understand what this is not: it is a threshold, not a deductible slice. If qualifying interest with a given bank comes to €260, the withholding applies to the entire €260 — not to the €10 above the line. Spreading savings across two banks so that each stays under €250 is therefore a genuine, if modest, planning point.

The withholding is final for residents in almost all cases. Where the interest constitutes commercial, agricultural or liberal-profession income, the 20% is instead credited against the final liability rather than discharging it. And interest from a foreign paying agent falls outside automatic withholding: a resident may opt into an equivalent 20% regime, declaring it by 31 December of the year following the income year.

Dividends: half exempt, and the withholding you get back

Luxembourg dividends paid to a resident individual suffer a 15% withholding tax at source, which is not final — it is credited against your final assessment. On the return itself, half of the dividend is exempt where it is paid by a qualifying company, and only the remaining half enters taxable income at your ordinary rate.

Two allowances then apply to investment income assessed by return:

• An annual exemption of €1,500, doubled to €3,000 for jointly taxed spouses.
• A lump-sum allowance for acquisition costs of €25, or €50 where both spouses receive such income. Actual qualifying costs may be claimed instead if they are higher.

The €1,500 exemption is frequently misapplied. It concerns investment income taxable by assessment — dividends, foreign interest brought into the return. It is not an additional exemption stacked on top of interest that has already been finally taxed under RELIBI.

Share gains: the six-month line

For a private investor, a capital gain on securities is taxable only if it is speculative, and speculative means an interval between acquisition and disposal of no more than six months. Hold longer than six months and the gain falls outside the ordinary speculative charge entirely.

• Speculative gains are added to income and taxed at ordinary progressive rates.
• A €500 small-gain threshold applies: aggregate speculative profit for the calendar year is not taxable when it stays below €500. Like the RELIBI threshold, this is a cliff — cross it and the whole gain is taxable, not just the excess.
• Losses within the speculative period can be set against speculative gains of the same year.

The substantial participation exception

The six-month rule does not help a significant shareholder. Where the taxpayer holds a substantial participation — more than 10% of the entity's capital — the gain remains taxable however long the holding has run. Two details make this wider than it looks:

• The test looks back five years: it is enough to have held more than 10% at any time during the five years preceding the disposal.
• Holdings are aggregated — direct and indirect holdings of the taxpayer are combined with those of a spouse or partner and of minor children.

A family that collectively owns 12% of a company cannot escape the charge by splitting the shareholding between its members, and a founder who diluted below 10% two years ago is still caught.

Crypto-assets follow the same logic

Luxembourg has never created a separate regime for virtual currencies. The tax administration treats them as intangible assets, which means the framework above applies rather than anything exotic:

• Held privately and disposed of within six months, the gain is speculative and taxed at ordinary rates, sharing the same €500 annual threshold as securities.
• Held privately for more than six months, the gain generally falls outside the speculative charge.
• Where the activity amounts to a commercial undertaking — frequency, use of borrowing, professional organisation — the profit is business income, taxed as commercial profit and outside the six-month protection entirely.
• Mining and staking rewards are receipts to be valued when received, not simply untaxed appreciation.

The practical difficulty is evidential rather than legal. Establishing an acquisition date and a euro cost for each disposal is the taxpayer's burden, and exchanges rarely produce it in a form the administration will accept without work.

Pension and life-assurance products

Two long-term savings vehicles sit outside all of the above and are taxed on their own terms. Contributions to a private pension plan are deductible up to €4,500 a year from tax year 2026, but the contract must run at least ten years and cannot pay out before age 60; at maturity an annuity is 50% exempt while a lump sum is taxed as extraordinary income at the half-global-rate. Premiums on qualifying life, sickness, accident, disability and third-party liability policies fall instead under the combined €672 ceiling shared with personal loan interest. Choosing between deducting a premium now and being taxed on the proceeds later is a genuine calculation, and it turns on whether your marginal rate is likely to be higher today or in retirement.

A worked example

Take a resident couple, jointly taxed, in 2026:

• €300 of interest from a Luxembourg savings account. Above the €250 threshold, so the bank withholds 20% on the full €300 — €60. Nothing is declared.
• €4,000 of dividends from a qualifying company. Half is exempt, leaving €2,000. The €3,000 joint exemption covers it entirely, so no tax arises, and the 15% withheld at source comes back.
• A €7,000 gain on shares bought fourteen months earlier. Outside the six-month window and no substantial participation, so it is not taxable.
• A €420 gain on shares bought and sold within three months. Speculative, but below the €500 annual threshold, so it escapes.

Total tax on the year's investment income: €60.

What to watch

Two things deserve attention. First, foreign accounts are visible: Luxembourg exchanges information automatically under the Common Reporting Standard, so interest earned abroad is not invisible to the administration, and the voluntary 20% regime exists precisely to give residents a clean way to settle it. Second, the six-month rule is a rule about securities — it does not extend to property, where the speculative period is five years, nor should its generosity be assumed for every asset class.

Our guides to the tax-exempt defence bond, filing your return and the tax classes cover the surrounding rules.