If you disagree with a tax judgment of the Court of Appeal, an appeal in cassation to the Supreme Court may be possible. The Supreme Court does not rehear your tax case as a court of fact. Its focus is errors in applying the law, procedural rules and legally relevant defects in reasoning. A specialist tax lawyer can investigate whether your objections fit these categories. There is no general requirement for lawyer representation when initiating and conducting tax cassation; a lawyer must, however, be engaged for oral pleading. Have the deadline, financial stake and available next steps assessed at the same time.
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1. Distinguish a complaint on a point of law from dissatisfaction with evidence
A cassation assessment starts with the legal foundation of the judgment. Did the Court of Appeal use the correct statutory test? Was an essential submission addressed? Is an inference supported by comprehensible reasoning? Such questions differ from wanting a court to find your statement more credible after all. A factual finding cannot simply be weighed again because you disagree with the result or read a document differently.
For each potential complaint, ask your specialist to explain which passage is challenged and why that defect might lead to a different decision. The distinction between fact and law can be difficult, especially when classifying contracts for tax purposes. A cassation opinion must therefore contain more than a list of unfavourable considerations. Also have it record why a complaint may serve no purpose if another independent ground already supports the outcome.
2. First establish whether cassation is available and the deadline
Read the judgment’s reference to remedies and have an adviser check whether cassation is available. In ordinary tax proceedings, cassation follows an appeal to the Court of Appeal. Do not assume a direct route from the district court without separate advice. The Supreme Court states a six-week deadline for a cassation appeal. Therefore do not wait to request an assessment until you have completed a detailed personal reconstruction of the case.
The deadline starts the day after prescribed notification to the parties, usually dispatch or digital availability of the judgment. Keep the covering letter and portal details: the date of public pronouncement need not be decisive. Exclude the notification day from the count and then count 42 calendar days. Next check the final day and any weekend or public holiday rules. A 2026 opinion explains the significance of that notification; the opinion is not an individual deadline decision or a substitute for checking the file.
3. Gather the existing litigation file in full
Provide the district court and Court of Appeal judgments, all notices of appeal, statements of defence, supplementary documents, written pleadings and relevant hearing records. Add a contents list organising each document by date and court. State which attachments were actually filed. A document held only by your accountant does not thereby form part of the court file. That distinction matters when assessing potential complaints about the handling of your submissions.
New facts and new evidence cannot be used for the first time in cassation to rebuild the substance of the tax case. If you discover an unknown bank statement after the appeal judgment, tell your lawyer, but do not expect the Supreme Court to base a new factual finding on it. Have any other possibilities assessed separately. The cassation specialist must be able to locate where an essential submission already appeared in the file.
4. Choose tax cassation expertise and record the engagement
Mandatory representation in civil cassation must not automatically be applied to tax proceedings. According to the Supreme Court, parties in tax cases may in principle act themselves or choose a representative; a lawyer is required for oral pleading. The absence of a general requirement says little about the difficulty. Good complaints require knowledge of tax legislation, cassation technique and the limits of judicial review.
Ask who prepares the cassation opinion, who writes the notice of appeal and who monitors deadlines. Agree whether the initial engagement covers only a feasibility assessment or also filing, responding to the defence and further procedural steps. Indicate whether the same tax question arises for other years. An independent second assessment may be useful if your earlier adviser was closely involved in a disputed procedural choice, without that in itself proving an error by that adviser.
5. Make a focused filing and monitor the portal
A notice of appeal must identify the judgment challenged and the grounds for seeking its quashing. The Supreme Court provides information about content and filing. Check the current digital rules for your capacity: legal persons and professional representatives are subject to mandatory digital litigation, whereas an individual acting personally may have a choice. Use the official instructions and procedural rules for your specific situation.
If the assessment cannot be completed before the deadline, immediately have an adviser assess how cassation can be initiated on time and which opportunities to supplement or remedy deficiencies are available. A request for extra time is not in itself a safe replacement for the remedy. Record acknowledgements and make one person responsible for all messages. Also keep an organised copy of the file outside the portal; access to a digital file is not a permanent archiving solution.
6. Budget for what follows without assuming victory or full reimbursement
Discuss what a favourable cassation decision can actually achieve. Quashing the judgment need not mean the assessment immediately lapses or the desired amount is repaid. Further consideration after referral may be needed. Ask which factual disputes would remain open and what budget they would require. Even a formally strong complaint may provide little practical benefit if the same result remains possible after the defect is remedied.
Include your own advisory costs, court fee, possible further assistance and payment position in your decision. Any litigation costs award is no guarantee of reimbursement of the entire bill. Separately check whether a deferral decision remains valid during cassation and whether further contact with the collector is needed. A cassation appeal and a request prompted by cash-flow problems serve different purposes; do not let either disappear behind the substantive discussion.
7. Fictional example: a contract was classified incorrectly
Suppose a business owner loses on appeal because the court places an agreement within a tax scheme. The owner wants to submit statements from new witnesses in cassation. A more useful first step is to examine the facts established by the Court of Appeal and the legal test it used. This fictional scenario may involve a question of law, but may also depend largely on evaluation of evidence that is not repeated in cassation.
For advice, prepare the contract, disputed considerations and references to earlier arguments. Ask the specialist for an assessment of the promising complaint, the interest in pursuing proceedings and costs of any referral proceedings. Meanwhile have the deadline monitored. A sober negative opinion can be a valuable result if it prevents you expecting an expensive third round of factual assessment that the Supreme Court cannot provide.
Frequently asked questions
Do I need a cassation lawyer in a tax case?
Tax cassation has no general requirement for lawyer representation as in civil cassation. A lawyer is required for oral pleading. Ask a specialist which procedural steps suit your case.
Can the Supreme Court assess new evidence?
The Supreme Court does not repeat the assessment of facts and cannot use new facts and evidence to rebuild your case factually. The existing litigation file is central.
Does winning cassation immediately mean the tax assessment is quashed?
That does not follow automatically. The precise decision may require further consideration after referral. Have the possible next stages and costs explained beforehand.
Sources
These sources relate to this page. For a specific case, check current rules and your own documents.
- Hoge Raad — fiscale cassatieprocedure Accessed: 2026-10-23
- Hoge Raad — cassatie Accessed: 2026-10-23
- Parket Hoge Raad — conclusie ECLI:NL:PHR:2026:421 Accessed: 2026-10-23
- Hoge Raad — Procesreglement Accessed: 2026-10-23
- Hoge Raad — digitale toegang vanaf 2026 Accessed: 2026-10-23
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Editorial team Tax law in the Netherlands
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