Deductible Business Expenses in Belgium: 2026 Tax Guide

In Belgium, legally reducing taxable income through a rigorous deduction of business expenses is one of the key strategies for tax optimization for self-employed individuals and SME executives. However, Belgian law imposes a strict framework and precise criteria for determining which expenses are fully deductible, which expenses are subject to caps, and how legal status (individual or SRL) affects these deductions.

This comprehensive guide provides an overview of the rules applicable for the 2026 tax year, the implementation of mandatory electronic invoicing via Peppol, vehicle taxation, and the trade-offs between individual and corporate status.

The 4 Legal Conditions for Deducting a Business Expense in 2026

For an expense to qualify as a business expense for tax purposes and reduce your taxable income, it must meet all four of the following legal conditions:

• Connection to professional activity: The expense must be directly intended to generate or maintain taxable professional income.
• Taxable period: The expense must have been incurred or paid during the relevant tax year or period.
• Conclusive evidence: The existence of the expense and its exact amount must be substantiated by valid supporting documents (invoice, receipt, fee statement).
• Exclusion of personal use: Any use for personal purposes is excluded from the deduction; only the portion strictly related to professional activity may be taken into account.

Important note: If an expense includes a portion for personal use (mixed-use expense), a precise breakdown must be provided to isolate only the portion related to business activity. Specific rules or exceptions apply, particularly in cases of separate re-invoicing to a third party.

New for 2026: Mandatory electronic invoicing via Peppol

As of January 1, 2026, Belgium’s accounting and administrative framework has been modernized with the requirement for structured electronic invoicing.

• Scope of the measure: Structured electronic invoicing has become mandatory for most transactions between Belgian businesses (B2B) subject to VAT.
• Peppol standard channel: The Peppol network serves as the standardized exchange channel for sending and receiving these structured documents, subject to certain regulatory exceptions.
• Impact on deductibility: The traceability of supporting documents has been strengthened. To deduct an expense and recover the VAT (when it is deductible), retaining these structured invoices has become the standard practice for proving the existence and compliance of the expense.

Which business expenses are 100% deductible?

When expenses are exclusively business-related and do not include any personal use, they may be deducted in full from your income.

Expenses that are generally 100% deductible include:

• Rent and utilities for business premises: rent for an office, workshop, or retail space, as well as associated utilities (water, electricity, heating, maintenance).
• Supplies and small equipment: the purchase of office supplies, stationery, and commonly used items that are consumed quickly.
• Professional consulting fees: invoices issued by your accountant, tax advisor, lawyer, or other specialized consultants.
• Professional insurance: premiums covering professional liability insurance, legal protection, or coverage for business premises.
• Training and seminars: expenses for training and professional development directly related to the practice of your profession.

Expenses with Limited or Capped Deductibility in 2026

Belgian lawmakers apply tax restrictions to certain categories of expenses due to their dual nature or an inherent element of personal benefit. The non-deductible portion constitutes what is known as a non-allowable expense (DNA), which must be added back to taxable income.

1. Restaurant expenses

• Tax deduction rate: 69% deductible for income tax (IPP or ISoc).
• Non-deductible portion (DNA): 31% of the expense is automatically added back to the taxable income base.
• VAT treatment: VAT on restaurant expenses is generally not recoverable, except in specific situations (e.g., seminars, sales events, or training sessions organized under certain conditions).

2. Entertainment Expenses and Business Gifts

• Entertainment expenses: 50% deductible (the remaining 50% constitutes non-deductible expenses).
• Business gifts: Also generally 50% deductible, provided they are given for business purposes.

3. Business vehicle expenses

Vehicle expenses are a category that is subject to particularly close scrutiny and regulation:

• Variable deduction: The deductibility of vehicle expenses is not subject to a single fixed percentage. It depends on the engine type, CO2 emissions level, date of purchase or signing of the lease agreement, as well as the applicable tax regime.
• No General Rule: Arbitrary percentages should be avoided without a detailed review of the vehicle in question and its contract.

Current Expense vs. Depreciation of an Investment

Not all cash outflows are treated the same way for accounting and tax purposes:

• Current expense: A low-value purchase or one consumed immediately (supplies, subscriptions, minor services) is recognized directly as an expense and fully reduces the profit for the fiscal year in which the expense occurred.
• Fixed Assets (Depreciation): Equipment intended for use over several years (computer hardware, machinery, office furniture, vehicles) must be recorded as assets on the balance sheet. Their acquisition cost is then gradually deducted over their estimated useful life through annual depreciation.

Self-Employed Individual vs. LLC: What Are the Implications for Your Expenses and Taxes?

The choice of legal structure significantly affects how business expenses and overall taxation are handled.

1. Self-employed individual

• Calculation of Deductions: For goods or services used for both personal and business purposes (e.g., a personal computer or phone used for both personal and business purposes), only the personal portion is excluded from the calculation of business expenses.
• Income Tax & Social Security Contributions:
• Net profits are directly subject to Individual Income Tax (IPP).
• In 2026, the top IPP tax bracket of 50% applies to taxable income starting at €51,070.
• Social security contributions amount to 20.50% on income up to €75,024.54, then 14.16% on the portion above that threshold.
• When municipal surcharges are added, the marginal tax rate reaches approximately 61.4%. In the highest income brackets, less than €40 remains available for every €100 of additional profit generated.

2. The Limited Liability Company (SRL)

• Treatment of mixed-use assets: An asset made available to the executive by the LLC and used for private purposes constitutes a Benefit of Any Kind (ATN), which is taxable to the executive.
• Flexible Taxation:
• Profits retained by the company are subject to corporate income tax (ISoc) at the standard rate of 25%, or at a reduced rate of 20% on the first €100,000 for eligible SMEs.
• Profits distributed as dividends are subject to the standard 30% withholding tax on income from securities, or the favorable VVPRbis regime at a rate of 18% (applicable as of July 1, 2026, subject to compliance with legal criteria).
• Relevance threshold: The decision to incorporate is generally considered when annual profits reach an indicative threshold of €50,000 to €60,000, particularly if not all of the income needs to be withdrawn to meet household needs.

Frequently Asked Questions (FAQ)

Is a simple sales receipt sufficient to claim a deduction for an expense in 2026?

A receipt can be used to prove an expense for income tax purposes if it contains the necessary details. However, to claim a VAT refund, a complete invoice (bearing the customer’s VAT number) is required. In B2B transactions between Belgian taxable entities, structured invoices sent via the Peppol network have been mandatory since January 1, 2026.

What are the reduced tax rates applicable to SMEs organized as limited liability companies (SRLs)?

For SRLs, corporate income tax (ISoc) applies a reduced rate of 20% on the first €100,000 of profits (instead of the standard rate of 25%), provided the company meets the legal criteria and the minimum compensation requirement for the executive.

What is the VVPRbis withholding tax rate on dividends in 2026?

As of July 1, 2026, the preferential VVPRbis withholding tax is 18% on dividend distributions, provided that all capital and holding period requirements set forth by law are met. The standard withholding tax, meanwhile, remains set at 30%.

Is the deduction for car expenses the same for all vehicles?

No. There is no single flat rate. A vehicle’s tax deductibility depends directly on its CO2 emissions, its engine type, the date the lease or purchase agreement was signed, and the tax regime applicable to it.

How much does it cost to form an SRL in 2026?

The average cost of the incorporation procedures and fees is estimated at approximately €2,700 (including approximately €1,650 for the notarial deed, €750 for the financial plan and support services, and €300 for the business registration office and publications).

Summary and Optimization Tips

To maximize your deduction for business expenses in Belgium in 2026 while ensuring your tax security:

1. Strictly comply with the four legal requirements to avoid having any expenses reclassified as non-deductible during an audit.
2. Comply with the Peppol network for receiving and sending your B2B invoices.
3. Clearly distinguish between direct expenses and depreciation when managing your equipment.
4. Perform a customized simulation to assess whether switching to an SRL is advisable if your annual profit is between €50,000 and €60,000 or higher, in order to compare the effect of the marginal tax rate for the IPP (61.4%) against the corporate income tax (ISoc) and VVPRbis rates.

For any analysis specific to your vehicle fleet, your depreciation, or the decision between operating as an individual and as an SRL, consulting with a certified public accountant or tax specialist remains the best way to ensure your tax options are secure.