Cash flow is rarely ruined by one big mistake. More often it’s a slow leak: an assessment you didn’t expect, a discussion that drags on, an invoice you can’t collect because a contract clause is vague, or a “we’ll come back to it” from an authority that lands right when you’re already stretched. That’s why one quiet legal update matters more than it looks. On 23 December 2025, the Ministry of Finance announced the publication of the Wet stroomlijning fiscaal inzagerecht (law streamlining the fiscal right of inspection). It sounds technical, but the promise is simple: you shouldn’t have less information about your own tax case than the Inspector does, especially when an assessment or a formal decision is made.

The idea isn’t new. A change in the AWR, the Algemene wet inzake rijksbelastingen, our general tax law, was set to give taxpayers the right to request access to their fiscal file. That rule would enter into force on 31 December 2025. The problem is practical: the Tax Administration and Customs said the “on request” version isn’t workable as written, because the relevant pieces of a file are scattered across processes and systems. Without the right digital plumbing and clear boundaries, you get the worst of both worlds: a legal right on paper, and long waits in real life.

So the new law flips the logic. Instead of a passive right, where you must ask, wait, chase, and hope, the goal becomes an active right. In plain language: you should automatically get access to the relevant documents through the digital portal of the Tax Administration or Customs, without first filing a request. For small businesses, this matters because disputes are rarely about “tax theory.” They’re about timing, proof, and clarity. When you can see what information was used, what was missing, and what weighed in a decision, you can respond faster, correct errors earlier, and keep a discussion from turning into a months-long drain on attention and liquidity.

I see how this plays out in a very ordinary situation: a small company receives an assessment that doesn’t match its own administration. The owner knows the numbers are right but can’t tell where the mismatch is coming from, an interpretation, a data source, an internal note, a missing attachment. Without visibility, you either overreact or underreact. You might pay “to make it go away,” harming cash flow, or you might object too late or with the wrong focus, wasting time and trust. Automatic access won’t remove the need for good bookkeeping, but it can reduce the fog. And when the fog lifts, decisions get cheaper: fewer hours, fewer back-and-forth emails, less stress in the middle of a busy quarter.

There is one quiet catch: “automatic access through the portal” only helps if your own administration can meet it halfway. If your invoices, bank movements, and agreements are scattered across inboxes and folders, you’ll still spend your evenings reconstructing history. The practical upgrade is not dramatic. Tighten your dossier habits: keep contracts where you can find them, match invoices to payments, store supporting documents with the same discipline you expect from your clients. And make sure someone in the business checks the portal regularly, not because you expect trouble, but because surprises are expensive precisely when they arrive late.

This law takes effect on 31 December 2025, and it sits inside the wider Belastingplan 2026 package. I like its direction: less chasing, more symmetry, fewer information gaps. For micro-entrepreneurs, the win is not “more rights” in the abstract; it’s fewer hours spent proving what you already know. Keep your administration calm and consistent, keep your digital access in order, and treat clarity as a form of risk control. Not loud, not glamorous, just the kind of small adjustment that protects your time and your cash when the unexpected letter arrives.