How is a US consultant with a single-member LLC taxed after moving to Belgium in 2026?
Moving to Belgium in 2026 with a US LLC? Belgium may tax the LLC, investments and worldwide income, subject to treaty relief and the exact facts involved.
A US citizen who becomes a Belgian tax resident in 2026 is generally taxable in Belgium on worldwide income. A single-member US LLC may also acquire Belgian corporate residence or a Belgian permanent establishment when its management and work are carried out from Belgium. Tax-treaty and foreign-tax-credit mechanisms can often prevent actual double taxation, but the correct treatment depends on the individual situation.
The figures below are illustrative and relate to income year 2026, assessment year 2027. Amounts have been rounded.
When does a person moving from the United States become a Belgian tax resident?
Belgian tax residence is determined primarily by where a person has their effective home or the seat of their wealth.
Registration in the Belgian National Register creates a presumption that the person is a Belgian resident. The factual circumstances remain important, but the position becomes particularly clear where the newcomer establishes a household in Belgium with a spouse or legal cohabitant.
For married persons and legal cohabitants, Belgian law places the tax domicile where the household is established. According to the source analysis, this presumption is irrebuttable.
As a result, the following factors will not normally prevent Belgian residence when the household is established in Belgium:
travelling abroad for several months;
retaining a US mailing address;
continuing to invoice American clients;
describing the move as a temporary or one-year test;
maintaining US bank, investment or retirement accounts.
The Belgium–United States tax treaty also contains residence tie-breaker rules. In a typical case where the permanent home and centre of vital interests are in Belgium, those rules are likely to point to Belgium.
Once Belgian residence begins, Belgium generally taxes the person’s worldwide income, including professional profits, dividends, investment gains and occasional artistic income.
Does US citizenship mean that income is taxed twice?
US citizens remain subject to US federal taxation on their worldwide income even when living abroad.
The Belgium–United States treaty contains a saving clause that preserves the United States’ right to tax its citizens as though the treaty did not exist, subject to specified exceptions.
This means that a US citizen living in Belgium may have filing and tax obligations in both countries. However, actual double taxation can often be reduced or eliminated through:
Belgian exemptions where the treaty assigns taxing rights to the United States;
US foreign tax credits for Belgian tax;
the treaty’s special re-sourcing rules for US citizens;
coordinated treatment of professional, pension and investment income.
The result depends on the nature and source of each category of income. It is not enough to compare the headline tax rates of the two countries.
How does legal cohabitation affect the Belgian tax return?
Belgian legal cohabitants are treated in the same way as married couples for personal income tax purposes.
During the calendar year in which legal cohabitation is declared, the partners normally continue to submit separate Belgian tax returns.
From the following income year, they generally submit a joint return. This is not optional.
A joint return does not necessarily mean that all income is combined and taxed at one common rate. Each partner’s income is still calculated separately within the joint assessment.
For example, where legal cohabitation begins during income year 2026:
separate resident returns are generally filed in 2027 for income year 2026;
a joint return normally applies from income year 2027 onward.
How does Belgium classify a single-member US LLC?
A single-member LLC may be treated as a disregarded entity for US federal income tax purposes. Its profits are then reported directly by its owner.
Belgium does not necessarily follow that US tax election.
Belgian classification generally looks at the entity’s legal characteristics. Because a US LLC usually has separate legal personality, Belgium may treat it as an opaque company that is legally and fiscally distinct from its shareholder.
This creates a classification conflict:
the United States may treat the LLC’s profits as the owner’s personal income;
Belgium may treat the LLC as a separate company;
withdrawals may have a different character in Belgium from their character in the United States.
The treatment cannot therefore be determined solely from the LLC’s US tax return.
Can the US LLC become a Belgian-resident company?
A foreign company may become taxable in Belgium when its place of effective management is located in Belgium.
This risk is significant where:
the sole owner and manager lives in Belgium;
important business decisions are made from Belgium;
contracts and client relationships are managed from Belgium;
most or all services are personally performed from Belgium;
the entity has little independent activity or substance in the United States.
In that situation, Belgium may consider the LLC to be a Belgian-resident company subject to Belgian corporate income tax.
The standard Belgian corporate income tax rate stated in the source analysis is 25%. A reduced rate of 20% may apply to an initial tranche of profits for qualifying small companies, subject to conditions that can include minimum director remuneration.
Even when the LLC is not considered fully resident in Belgium, it may have a Belgian permanent establishment. Profits attributable to the work performed through that Belgian establishment may then be taxable in Belgium.
Does leaving profits inside the LLC avoid Belgian tax?
Not necessarily.
Keeping profits in the LLC does not automatically prevent Belgian taxation if the entity is managed from Belgium or has a Belgian permanent establishment.
Amounts later distributed to the Belgian-resident owner may also be characterised as dividends. The source analysis refers to the ordinary Belgian dividend tax rate of 30%.
A further issue is the Belgian Cayman tax regime for legal constructions. Depending on the LLC’s characteristics and the way its income is taxed, the regime may involve:
mandatory disclosure in the Belgian personal income tax return;
look-through taxation of certain income;
an extended 10-year audit period;
possible taxation of undistributed reserves when the founder leaves Belgium.
Whether the full Cayman-tax treatment applies depends on the entity’s precise legal and tax characteristics. The reporting risk alone means that the classification should be examined before the LLC continues operating from Belgium.
Can US-taxed LLC income be exempt from Belgian tax?
Belgian administrative guidance provides a favourable mechanism in certain cases where a Belgian resident receives income from a US LLC that was taxed transparently in the United States.
However, the source of the underlying income remains essential.
The mechanism is more relevant where the LLC earns genuine US-source income, such as income from US activities or US real estate.
It is much less likely to protect consulting profits where:
the owner performs the services physically from Belgium;
the business is effectively operated from Belgium;
the value-generating activity takes place in Belgium.
In such circumstances, Belgium may regard the profits as Belgian-source business income and retain the right to tax them.
What structures are commonly considered for a temporary move?
There is no universal structure, but the main approaches are generally the following.
Operating directly as a Belgian self-employed person
The consultant registers as a Belgian self-employed person and invoices clients through the Belgian activity.
Professional profits are then taxed transparently as Belgian professional income. Personal income tax rates can reach 50%, plus a municipal surcharge of approximately 6% to 7% of the calculated tax in many Brussels municipalities.
Genuine business expenses may be deductible.
Services supplied to US business clients are generally outside the scope of Belgian VAT, although the consultant will still normally require:
a Belgian enterprise number;
VAT identification;
appropriate invoices and records;
Belgian bookkeeping and tax filings.
A pre-existing LLC may potentially be kept dormant, provided it does not continue invoicing for work that is actually carried out from Belgium.
Continuing to operate through the LLC
The LLC may continue operating, but the Belgian corporate-residence, permanent-establishment and Cayman-tax issues must then be accepted and managed.
This can involve:
a Belgian corporate income tax return;
Belgian accounting obligations;
a Belgian personal income tax return;
US federal filings;
foreign-account reporting in both countries;
possible tax on distributions.
Having the LLC contract with the Belgian individual
An intermediate structure in which the LLC invoices clients and separately pays the owner for services can raise transfer-pricing and profit-allocation questions.
The remuneration must reflect the economic value of the Belgian activity. This type of arrangement should not be implemented without a documented cross-border analysis.
Which country’s social security applies?
A self-employed person carrying out an activity in Belgium is normally subject to the Belgian social-security system for the self-employed.
The source analysis refers to Belgian contributions of approximately 20.5% of net professional income up to a ceiling, with reduced rates above that level. The exact ceilings and rates are indexed.
Belgium and the United States are, however, parties to a social-security totalization agreement.
Under the rule described in the analysis, a self-employed person who transfers an existing activity from one country to the other for five years or less may remain covered by the system of the original country.
For a temporary transfer from the United States to Belgium, the person may therefore be able to:
remain covered by US Social Security;
continue paying US self-employment tax;
continue earning US Social Security credits;
obtain an exemption from Belgian self-employed social contributions.
A certificate of coverage must generally be requested from the US Social Security Administration.
The exemption also means that the person does not build Belgian social rights through those contributions. Belgian health-insurance access or private health cover must therefore be organised separately.
The position should be reviewed if the stay exceeds five years or the person becomes a director of a Belgian or foreign company.
How are US brokerage investments taxed in Belgium?
A Belgian resident must consider Belgian taxation even when the investment account remains with a US broker.
Foreign dividends
Foreign dividends are generally taxable in Belgium at 30%.
A US citizen may also owe US tax on the same dividends. According to the source analysis, Belgian individuals do not benefit from a general Belgian credit for the US tax on those dividends.
The combined burden may therefore be higher than it was before Belgian residence began.
Capital gains from 1 January 2026
The source analysis states that, from 1 January 2026, Belgium taxes realised capital gains on financial assets such as shares, ETFs and crypto-assets at a flat rate of 10%.
The analysis identifies:
an annual exemption of €10,000 per person;
indexation of the exemption;
a possible increase toward €15,000 where the exemption is unused;
deductibility of losses realised during the same year.
For assets acquired before 2026, the taxable gain is measured using the asset’s value on 31 December 2025, rather than the original historical purchase price. This protects appreciation accumulated before the new regime began.
Where the account is held with a foreign broker, Belgian tax will not normally be withheld automatically. The resident must identify and report the taxable gains through the Belgian return.
Timing can therefore matter. Gains realised:
before Belgian residence begins;
while the person is a Belgian resident; or
after a genuine departure from Belgium
may produce different Belgian consequences.
The US treatment must be coordinated separately because the United States may tax the same disposal.
Belgian stock-exchange transaction tax
Belgian residents may owe the Belgian stock-exchange transaction tax, or TOB, on transactions executed through a foreign broker.
Because a US broker will not generally collect the Belgian tax, the investor may need to calculate, declare and pay it personally.
Annual tax on securities accounts
The Belgian annual tax on securities accounts applies only where the relevant average account value exceeds €1 million.
An illustrative portfolio in the range of approximately $100,000 to $150,000 would therefore be below that threshold.
Reporting foreign accounts
Belgian residents must notify foreign bank and brokerage accounts to the Central Point of Contact of the National Bank of Belgium.
The accounts must also be mentioned annually in the Belgian personal income tax return.
The treatment of certain US retirement accounts can require interpretation. The prudent approach described in the source analysis is to disclose them.
How are a 401(k) and Roth IRA treated?
Taxation while the funds remain invested
Belgium does not generally tax the internal accumulation inside recognised foreign pension vehicles merely because the account holder becomes Belgian resident.
Holding a 401(k) or Roth IRA during a Belgian stay should therefore not, by itself, create annual Belgian tax on the internal growth.
The reporting obligations for foreign accounts remain relevant.
Taxation when money is withdrawn
The Belgium–United States treaty generally assigns pension taxation to the country of residence.
However, it contains an important exception for payments that would have been exempt in the source country if the recipient had remained resident there.
A qualifying Roth IRA distribution that is tax-free in the United States may therefore also qualify for exemption in Belgium.
A Belgian–US competent-authority agreement confirms which US retirement arrangements, including IRAs, are recognised for the relevant treaty provisions.
The result should nevertheless be verified against the exact account and distribution conditions before a withdrawal is made.
Continuing to make contributions
Contributions to US retirement accounts do not generally produce a Belgian income-tax deduction.
On the US side, IRA and Roth IRA contributions require eligible taxable compensation. Earned income excluded under the Foreign Earned Income Exclusion, or FEIE, cannot generally support an IRA contribution.
A person who excludes all earned income under the FEIE may therefore lose contribution eligibility for that year.
Because Belgian tax rates are often higher than US federal rates, claiming US foreign tax credits may be more useful than relying on the FEIE. The foreign-tax-credit route can also preserve eligible compensation for US retirement contributions.
Ordinary Roth IRA income limits and the rules for arrangements such as a solo 401(k) must also be considered.
How is occasional artistic or teaching income treated?
A Belgian resident must declare worldwide occasional income, even where the annual amount is only a few thousand dollars.
If the activity is genuinely occasional, it may be treated as miscellaneous income, taxed separately at 33%, plus the applicable municipal surcharge.
If the activity becomes regular, organised or profit-oriented, it may instead be treated as professional income.
Where the person is already registered as self-employed for another activity, including the artistic or teaching work in that professional status may be administratively simpler.
Performances physically carried out in another country may be taxable there under the artiste provisions of the applicable treaty. Belgium may then provide relief under the relevant treaty mechanism.
For qualifying performances in Belgium, the Belgian small-fees scheme for artists may protect modest payments when all statutory conditions are satisfied.
What US filing obligations continue after the move?
US filing obligations do not disappear when a US citizen becomes Belgian resident.
Depending on the facts, they may include:
an annual Form 1040;
reporting of self-employment income;
US self-employment tax where US Social Security coverage continues;
an FBAR once the aggregate value of foreign financial accounts exceeds $10,000;
potentially Form 8938;
continued LLC information reporting;
foreign-tax-credit forms.
Belgian bank accounts opened after the move can therefore create new US reporting obligations.
For income taxed in Belgium, the US foreign tax credit will often be the principal relief mechanism. The treaty’s re-sourcing provisions may be needed to make the credits usable for a US citizen resident in Belgium.
What should be arranged before and after moving?
Before the move
The main preparatory steps are generally:
determine whether the LLC will continue operating, become dormant or be replaced by a Belgian self-employed activity;
request the US certificate of social-security coverage;
review intended investment sales or portfolio rebalancing;
collect LLC formation documents, financial statements and recent US tax returns;
review retirement-contribution eligibility;
organise appropriate health coverage.
On arrival in Belgium
A newcomer may need to:
register with the municipality;
complete the legal-cohabitation formalities where applicable;
obtain a Belgian enterprise number;
activate VAT identification;
organise bookkeeping;
notify foreign accounts to the Central Point of Contact.
During the year
Recurring obligations can include:
maintaining proper professional records;
submitting VAT filings where required;
making quarterly Belgian advance tax payments;
calculating and declaring TOB on foreign-broker transactions;
documenting travel, work locations and business decisions;
coordinating Belgian and US tax positions.
Belgian advance payments are particularly important for self-employed persons because insufficient payments can lead to a tax surcharge.
Belgian filing deadlines
A person who becomes resident during 2026 will generally file the first Belgian resident return in 2027 for income year 2026, corresponding to assessment year 2027.
The exact annual deadline is published by the Belgian tax administration.
If the person later leaves Belgium, a special departure return may become due shortly after departure. Deregistration alone is not conclusive where the household, permanent home or centre of vital interests remains in Belgium.
Frequently asked questions
Can I keep my US LLC after moving to Belgium?
Yes, the LLC can legally continue to exist. However, if it is managed from Belgium and the work is performed in Belgium, it may become subject to Belgian corporate tax, permanent-establishment rules and additional reporting obligations.
Can I keep invoicing US clients and pay tax only in the United States?
Generally not when the services are physically performed from Belgium by a Belgian tax resident. Belgium may tax the resulting professional or company profits, while US tax is coordinated through treaty relief and foreign tax credits.
Does keeping money inside the LLC postpone Belgian tax?
Not automatically. Belgium may tax the LLC’s profits at company level, and later withdrawals may be treated as dividends taxable at 30%. The Cayman-tax rules may also need to be examined.
Is Belgian self-employed social security always payable?
No. Under the Belgium–United States totalization agreement, a temporary transfer of an existing self-employed activity for five years or less may remain covered by US Social Security if a valid certificate of coverage is obtained.
Are capital gains realised through a US broker exempt in Belgium?
No automatic exemption applies merely because the broker is located in the United States. According to the source analysis, qualifying gains realised during Belgian residence from 1 January 2026 can be subject to the Belgian 10% capital-gains tax after the annual exemption.
Is a Roth IRA tax-free in Belgium?
Holding the account does not generally create annual Belgian tax on its internal growth. A qualifying distribution that would be exempt in the United States may also benefit from treaty protection in Belgium, but the exact account and withdrawal conditions must be verified.
Sources
Advisius — Tax residence of married couples and legal cohabitants
Law of assent to the Belgium–US income tax convention of 27 November 2006
Belgian–US competent-authority agreement on recognised pension plans under Article 17
SSA POMS RS 02001.271 — Self-employment rule under the agreement with Belgium
SPF Finances — Foreign accounts: Central Point of Contact and annual declaration
This article presents a general framework and does not constitute a personalised tax opinion. Tax rules, thresholds and administrative practices may change each year, and the correct treatment depends on the taxpayer’s exact residence, activities, entity documents, income sources and filing position.
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