Belgium runs its annual compliance through three channels that do not share a deadline. Annual accounts go to the National Bank of Belgium (NBB) and become public through the Central Balance Sheet Office. The corporate income tax return goes to the federal tax administration through the Biztax platform. Ownership information goes to the register of ultimate beneficial owners. A company that treats the three as one task will usually miss one of them.

This guide covers the besloten vennootschap or société à responsabilité limitée (BV/SRL), the most common vehicle for a foreign-owned subsidiary, and notes where the public limited company (NV/SA) and a branch differ. It is written for founders and for legal, finance and operations teams.

Updated November 9, 2026. Belgian filing dates are set by statute and by annual notices of the tax administration, so use the dates below as the usual pattern for a 31 December year-end and confirm them with the NBB and FPS Finance.

Entity compliance Belgium: the quick answer

• Prepare the annual accounts and submit them to the shareholders' meeting for approval within six months after the financial year-end.

• File the approved accounts with the NBB within 30 days after approval, and in any case no later than seven months after year-end, according to the NBB and professional guides.

• File the corporate income tax return on Biztax by the last day of the seventh month after year-end, which is 30 September for a calendar-year company in the 2026 assessment year.

• Pay quarterly advance tax payments, file VAT returns, and keep payroll and social security filings current.

• Confirm the beneficial owner register and check transfer pricing forms if the group is large enough.

What determines a Belgian company's compliance requirements?

Size and legal form decide the content of the accounts and the audit. Belgian law classifies companies as micro, small, large and very large by balance sheet total, turnover and employees, and the class decides which model of annual accounts to file and whether a statutory auditor is needed. Small companies below the thresholds can often use an accountant instead of an auditor, but larger companies and those with a supervisory duty need an auditor.

Ownership also matters. A foreign parent does not change the Belgian filing duties, but a group above the transfer pricing thresholds files local file and master file forms, and a group in scope of the global minimum tax rules has extra disclosures. Ask your adviser which regime the group is in.

Annual entity requirements in Belgium: the core checklist

1. Annual accounts and the shareholders' meeting

The managing body prepares the annual accounts and the management report and submits them to the ordinary general meeting. Professional guides state that the meeting must approve the accounts on the statutory date and at the latest within six months after the year-end. The body may postpone approval for three weeks, and the meeting may postpone it by majority vote. Keep the minutes, the signed accounts and any auditor's report together.

2. Filing with the National Bank of Belgium

The NBB states that the accounts must be filed within 30 days from approval by the general meeting. Professional sources add that the filing must happen no later than seven months after the end of the financial year, which is 31 July for a calendar-year company. The NBB advises against last-minute filing because its application can saturate near the deadline. Filing is electronic and uses the structured format of the Central Balance Sheet Office.

Late filing leads to a surcharge. Professional sources describe surcharges that build up in steps to as much as EUR 1,200 for larger companies, with lower amounts for small ones. The managing body can also face liability for late filing, so treat the seven-month limit as firm.

3. Corporate income tax return

Companies file the corporate income tax return electronically on Biztax through the MyMinfin portal. The deadline is the last day of the seventh month after the financial year-end, and the tax administration fixed it at 30 September 2026 for companies whose year ends between 31 December 2025 and 28 February 2026. The return builds on the annual accounts, so close the books early. The standard corporate rate is commonly cited as 25 percent, with a reduced rate for qualifying small companies, so confirm the rate with your adviser.

4. Advance payments

Companies pay corporate income tax in quarterly advance payments, with dates published by FPS Finance. Skipping them leads to an increase in the final tax bill, and new companies have a start-up regime that exempts the first years from the increase. Plan the cash for each quarter.

5. Beneficial owner register and fee forms

Belgian entities report their ultimate beneficial owners to the UBO register and keep the data current. Professional sources mention annual confirmation of the data, so check the current procedure with the Treasury. Companies that pay fees, commissions or benefits to third parties also file fee forms (281.50) with the tax administration, and missing them can lead to a disallowance of the expense.

Tax and indirect tax obligations

The standard VAT rate is 21 percent, and returns are filed monthly or quarterly through Intervat depending on turnover. Intra-EU supplies need an EC sales listing, and VAT-registered businesses file an annual listing of Belgian customers, which professional sources describe as the annual sales listing. Payments to non-residents may attract withholding tax, and dividends to a foreign parent carry withholding that the EU parent-subsidiary rules and treaties can reduce or remove when conditions are met.

Groups above the thresholds file transfer pricing forms. For a 31 December 2025 year-end, professional sources give 30 September 2026 for the local file form 275LF and 31 December 2026 for the master file form 275MF.

Foreign-owned subsidiaries

Belgium has no general limit on foreign ownership of a BV. The company needs at least one director, who need not be Belgian, and a registered office in Belgium. Foreign corporate shareholders provide documents that may need an apostille and a translation. The company registers in the Crossroads Bank for Enterprises, which gives it its enterprise number.

Banks apply due diligence to foreign-owned accounts, and the UBO register must show the real owners. Intercompany loans, management fees and royalties need written agreements and arm's-length pricing, and interest deductibility limits can apply. Branches of foreign companies file the accounts of the foreign company with the NBB.

First-year and event-triggered obligations

In the first year, the company is incorporated by notarial deed, the capital is paid in, the company registers with the Crossroads Bank and with VAT, and it registers with the social security office if it hires. The first financial year can be longer or shorter than twelve months, so set the year-end deliberately.

Events that trigger filings include a change of directors, a transfer of shares, a capital increase, a change of registered office, a merger and a liquidation. Most are published in the Belgian Official Gazette after a filing with the enterprise court, and ownership changes need a UBO update. Companies in liquidation still file accounts with the NBB, and the NBB gives specific rules for that case.

Employment and local requirements

Belgian employment law is detailed and collective. Joint committees set sector wages and conditions, and wages follow automatic indexation. Employers register with the social security office, file quarterly social security declarations and withhold payroll tax monthly. Employees receive double holiday pay and, in many sectors, a thirteenth month. Notice periods depend on seniority, and works councils or union delegations appear once headcount thresholds are met.

Build a compliance calendar for Belgium

A compliance calendar turns the rules above into dated tasks with named owners. Start from the financial year-end and the incorporation anniversary, then add the recurring monthly and quarterly items. Review it each quarter, because deadlines, extensions and registry systems change.

• January to March: close the books and prepare the annual accounts.

• By 30 June: hold the shareholders' meeting and approve the accounts.

• Within 30 days of approval and by 31 July: file the accounts with the NBB.

• By 30 September: file the corporate income tax return on Biztax.

• Quarterly: advance tax payments, VAT returns and social security declarations.

• By 31 December: transfer pricing master file, if the group is in scope.

Common mistakes

• Treating the NBB filing and the tax return as the same deadline.

• Waiting for the last week to file and meeting a saturated system.

• Holding the shareholders' meeting too late to meet the seven-month limit.

• Skipping advance payments and paying a tax increase.

• Forgetting fee forms for payments to third parties.

• Leaving the UBO register out of date after a change at the parent.

Entity compliance Belgium: frequently asked questions

When must Belgian annual accounts be filed with the NBB?

Within 30 days after approval by the general meeting and in any case no later than seven months after the financial year-end.

When is the Belgian corporate income tax return due?

The last day of the seventh month after year-end, which was 30 September 2026 for calendar-year companies.

Is an audit required for a BV?

Larger companies need a statutory auditor based on size criteria, while small companies below the thresholds can often use an accountant instead.

What is the Belgian standard VAT rate?

21 percent, with returns filed monthly or quarterly through Intervat.

Are Belgian accounts public?

Yes. The NBB publishes filed accounts through the Central Balance Sheet Office.

Do I need a local director?

A BV needs at least one director, who need not be Belgian.

How CoverPin can help

CoverPin helps finance, legal and operations teams track entity obligations across countries. See our international entities overview, learn about compliance advisory, or browse more guides in our legal and compliance resources.

This article is general information, not legal, tax or accounting advice. Confirm current requirements with the relevant authority or a qualified local adviser before acting.