Fiscal intelligence · NL 2026
Stop paying tax on
returns you didn't make.
See how much tax you overpaid in 60 seconds.
✓ EU-hosted✓ No credit card✓ AFM-compliant✓ Browser-only
Intelligence
Your Advisor-in-a-Box
Connect your broker, your tax system, and your retirement plan — in one intelligence layer built for the Dutch fiscal landscape.
Box 3 Belastingberekening & FIRE Planning
Master Tax Defense
Automated Box 3 Defence
Calculate your exact fiscal leakage and auto-generate the legal Tegenbewijs counter-evidence required by the Belastingdienst.
Legal basisHoge Raad '21 · Kerstarrest
OWR Route✓ Active 2026
Evidence bundle✓ Generated
Estimated saving€2,969/yr
Cash Intelligence
The Sneaky MMF Trap
Know instantly if your "safe" Money Market Funds (like XEON) are triggering a 4.7× Box 3 tax penalty.
6.00%
Fictitious investment rate applied to your MMF
4.7× penalty vs savings forfait
Portfolio & Forecast
Track, Project, Stress-Test
Real-time net worth, exact FIRE date projection, and 1,000 Monte Carlo stress tests across 8 historical crash scenarios.
€40,769
Median at retirement
77.9%
Guardrail survival
Strategic Intelligence that bridges the gap between raw portfolio data and the fiscal reality of your future.
Trusted. Precise. Science-Driven.
Built by investors, for investors — grounded in Dutch fiscal law and tested against Belastingdienst ground truth.
1,075
Tests Passing
Every engine validated against official Belastingdienst parameters and Hoge Raad precedent.
22
Modules
Portfolio, tax, retirement, cash, simulation — every wealth dimension covered.
60sec
To Intelligence
Import your broker CSV and see your full fiscal picture — Box 3, FIRE date, fees — instantly.
5
EU jurisdictions — NL, DE, FR, BE, ES — already tracking your tax position across borders.
Got Questions?
We've got answers.
Everything you need to know about WealthPlannr.
No. WealthPlannr is financial simulation software. We are not licensed under the Wft (Wet op het financieel toezicht) and do not provide financial advice. All calculations are based on 2026 fiscal parameters and should be verified with your belastingadviseur before filing.
Under the Kerstarrest ruling (Hoge Raad, 24 December 2021), you can submit counter-evidence showing your actual returns were lower than the government's fictitious rate. WealthPlannr calculates this gap using your real portfolio data and generates the evidence bundle required for the Opgaaf Werkelijk Rendement (OWR) route.
We support CSV imports from DEGIRO, ABN AMRO, Interactive Brokers (IBKR), Meesman, Rabobank, and Saxo. You can also add assets manually. The CSV parser handles 440+ positions in seconds.
Your portfolio data stays in your browser (localStorage) and is never sent to our servers. AI analysis uses zero-retention API calls — your data is not stored or used for training. We are DPA-secured and EU-hosted via Supabase.
Yes — WealthPlannr is built specifically for investors in the Netherlands, including expats. The 5-Country Tax Matrix lets you model relocation scenarios (e.g. Spain's Beckham Law) and calculate your Dutch exit tax break-even year.
The AI Advisor (powered by Claude) reads your entire portfolio and generates personalised insights across four areas: portfolio analysis, Box 3 optimization, pension gap, and Monte Carlo projections. It's like having a wealth strategist review your position — but available 24/7.
Still have questions?
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