How the box works
Your BV (besloten vennootschap, the Dutch private limited company) pays corporate tax as normal, but the slice of profit attributable to qualifying software is effectively taxed at 9%. “Qualifying” means: self-developed (outsourcing under your direction is fine), technically new to you, and covered by an S&O declaration for the development period. Profit from plain resale or services free of your own innovation stays outside.
The front door: S&O via the WBSO
You apply to the Dutch enterprise agency (RVO) in advance, per concrete development project. For a BV the WBSO benefit runs through payroll on your R&D wages — which is why this scheme intertwines with your director salary: your development hours must flow through the company as wages. A missing declaration keeps the box shut, however innovative the product.
Attribution: precise or flat-rate
The precise route calculates which share of profit stems from the innovation — very workable for a product BV where nearly everything does, and often fixed in an advance agreement with the tax authority. The flat-rate route lets smaller companies place a capped, fixed share of profit in the box with zero calculation: less benefit, zero discussion — the sober choice for many a micro-SaaS.
When it pays, and when to start
The box earns its keep once structural profit sits in the BV anyway: the gap between 9% and 19% (or 25.8%) then works every year, compounding with the retention engine from the BV guide. In a loss phase it yields nothing — but today’s S&O declarations are tomorrow’s entry tickets. Serious builders collect them from year one; the wider playing field is at the Netherlands for AI founders.