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.

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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%+.

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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.