Box 3 filing
Prepare your Box 3 filing without losing the thread
Start with the Aangifte Copilot to surface Box 3 exposure first, then continue with the exact follow-up steps and calculators that matter for your filing.
Surface savings, investments and foreign-asset follow-up early
The copilot lets you declare Box 3 exposure up front so the filing review is not starting from a blank state.
Move from filing questions to the right Box 3 calculator only when needed
Belastbaar can then recommend the Box 3 calculator and related follow-up only when it is relevant to your case.
Keep manual-only document reminders visible while you fill the return
You keep a side-by-side overview of what is estimated, what is confirmed, and what must still be entered manually.
Frequently asked questions
What documents are most helpful for Box 3 preparation?
Year-end bank statements, broker statements, debt overviews, and supporting documents for crypto or foreign accounts are usually the most important.
Why not start directly with the Box 3 calculator?
Because the filing copilot first determines whether Box 3 is actually relevant and then puts the Box 3 follow-up in the wider filing context.