The New Belgian Investment Deduction: Basic 10%, Digital 20%, Thematic 40%

Most Belgian small business owners leave money on the table every year because their accountant either does not ask, does not know, or does not have the right paperwork in time. The reformed investment deduction can be €5,000 to €40,000 a year for an SME making normal capital investments. Here is the founder's view.

What it does, in one sentence

When you buy equipment, software, vans, machinery, or pay for an R&D project, you can deduct extra taxable income on top of the normal depreciation. Pure subtraction from your tax bill. You still own the asset. The state pays a percentage of it back through lower tax.

The three pillars, in plain language

1. Basic — 10% on almost any business purchase.

Buy a printer for €500, deduct an extra €50 from your taxable base. Buy a delivery van for €30,000, deduct an extra €3,000.

If the purchase is digital — invoicing software, CRM, e-commerce platform, cybersecurity — the rate doubles to 20%.

2. Thematic — 40% on green and clean investments.

This is the new big one. If you install solar panels, buy an electric van, or invest in waste-reduction equipment, you get a 40% additional deduction. Buy €40,000 of solar, get €16,000 off your taxable base.

The catch: you need a certificate from the relevant regional or federal authority, and you must request it within 3 months after your financial year closes. Miss the window and you lose the deduction entirely. Most accountants do not chase this — chase it yourself.

3. Technology — 13.5% to 20.5% on R&D.

If your business invests in research and development — your own product, your own software, lab equipment — the technology deduction kicks in. Choose 13.5% one-shot or 20.5% spread over the depreciation period.

This pillar stacks with the R&D tax credit and the wage withholding tax exemption for researchers. A small Belgian software startup using all three correctly can effectively reduce its tax bill on R&D spend by 50%+.

A real number

Imagine you spend €100,000 in 2026 on a mix:

• €25,000 in standard equipment → €2,500 extra deduction
• €15,000 in digital tools (CRM, cybersecurity) → €3,000
• €40,000 in solar + electric van → €16,000
• €20,000 in R&D equipment → €4,100 (staggered)

Total extra deduction: €25,600.

At 25% corporate tax, that is €6,400 in cash tax savings for one year of investments. Repeat for three years and you have €19,200 — enough to fund one of those investments outright.

The five mistakes that kill the deduction

1. You forget to ask for the thematic certificate within 3 months of year-end. The most common failure. Put it in your calendar.
2. You buy a car. Most passenger cars are excluded. Vans, electric, and very specific cases qualify.
3. You sell the asset within 3 years. Pro-rata clawback. Plan disposals.
4. You buy abroad and use the asset abroad. Belgian deduction requires Belgian use.
5. You let your accountant skip Form 275U. The form is mandatory. Without it, the deduction does not exist in the eyes of the tax authority.

What to actually do

• Send your accountant a list of every capital investment over €1,000 you made this year by mid-February 2027 (for a calendar-year company). Earlier if you want the thematic certificate.
• For green and digital investments, ask: "Are we claiming this under the thematic / digital sub-rate?" If the answer is silence, you have a problem.
• If you do R&D, ask your accountant about the R&D tax credit + technology deduction + partial wage withholding tax exemption stack. These three together are the largest legal subsidy available to Belgian SMEs.

The reform is recent enough that many accountants are still operating on the pre-2025 rules. You are the founder. You make sure the money reaches you.

Legal basis: Art. 68 to 77 CIR/WIB 92, restructured by the Programme Law of 22 December 2023 and the Royal Decree of 20 December 2024 establishing the thematic lists. Effective for assets acquired or created from 1 January 2025.

The reform consolidates the pre-existing patchwork (basic deduction at 8%, increased deductions at 13.5% for digital, environment, energy savings, 13.5% for R&D, etc.) into a structured three-pillar system. The rates apply to the acquisition or investment value, excluding non-deductible costs (e.g., non-recoverable VAT only when correctly applied).

Pillar 1 — Basic deduction (Art. 69 WIB)

Rate: 10% for SMEs and self-employed; 0% for large enterprises (only the digital sub-rate available).

Eligible assets:

• Tangible and intangible fixed assets, depreciable, acquired or produced during the financial year.
• Exclusive professional use in Belgium.
• Not on the exclusion list (Art. 75 WIB): housing, certain passenger cars, assets used by employees for private purposes.

Digital sub-rate: 20%.

Defined assets (Royal Decree of 20 December 2024):

• Software for invoicing, accounting, customer relationship management (CRM), e-commerce.
• Cybersecurity assets.
• The "digital" character must be assessed on the primary function of the asset, not on incidental digital components.

Mechanics:

• Deduction applied to the taxable base of the financial year of investment.
• One-shot only (no staggered option in pillar 1).
• Carry-forward of unused basic deduction without time limit, but subject to ordering rules with other deductions (DRD, FRD, NID, R&D credit).
• Pro-rata clawback if the asset leaves professional use within three years.

Pillar 2 — Thematic deduction (Art. 70 WIB)

Rate: 40% for SMEs / self-employed; 30% for large enterprises.

Themes (4 lists per Royal Decree):

1. Efficient energy use and renewable energy.
2. Emission-free transport.
3. Environmentally friendly investments.
4. Supporting digital investments.

The lists are exhaustive — only assets on the list qualify. Two assets that look functionally identical can have different treatment if only one appears on the list.

Certificate procedure:

• Competent authority varies per theme: federal (energy savings via FPS Economy) or regional (Brussels, Flanders, Wallonia for environment and sustainable transport).
• Application window: within 3 months after the close of the financial year of acquisition. Strict and non-extendable.
• Documentation: invoice, technical specifications, intended use, location of installation.
• The certificate is mandatory in the tax file (Form 275U Annex).

No carry-forward of unused thematic deduction beyond the financial year of investment (subject to the general loss carry-forward via the unused taxable base reduction).

Pillar 3 — Technology deduction (Art. 70bis WIB)

Rate: 13.5% one-shot or 20.5% staggered (annualised across the depreciation period).

Eligible:

• R&D fixed assets (tangible and intangible).
• Patents acquired or self-developed, used in the conduct of R&D.

Anti-double-dip: the technology deduction does not stack on the same asset with the basic deduction. Choose one. It does stack with the R&D tax credit (Art. 289quater WIB) and the partial wage withholding tax exemption for researchers (Art. 275/3 WIB).

Documentation requirement: the R&D character of the activity must be substantiated, typically via a BELSPO advance ruling or a similar formal opinion. The FPS Finance increasingly cross-references R&D claims with BELSPO files.

Filing & forms

• Companies: Form 275U (annex to the corporate income tax return Form 275.1).
• Self-employed: Form 276U (annex to the personal income tax return Part 2).
• Thematic certificate: attached to the tax file; the original number must be referenced in the form.

Ordering of deductions (Art. 207 WIB)

The 2024 reform also tightened the order of deductions and the "deduction basket" limitation (Belgian implementation of Pillar 2 / OECD GloBE). For SMEs not in scope of Pillar 2, the practical ordering remains:

1. Current year tax losses.
2. Carried-forward tax losses (capped at 70% of taxable base above €1m).
3. Notional interest deduction.
4. Investment deductions (basic, then thematic, then technology).
5. R&D tax credit (refundable).

Three audit risks

1. Thematic certificate timing. A certificate dated more than 3 months after FY-close is fatal. The FOD has issued no tolerance.
2. Asset-use change. Sale, lease-back, or relocation abroad within 3 years triggers a notification obligation and pro-rata clawback. Compliance failure is sanctioned at 10–20% surcharge.
3. Digital sub-rate scope creep. Treating a generic ERP module or a standard accounting suite as "digital" when the primary function is general administration risks a reassessment to the standard 10% rate.