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APIs & Partnerships

Belastbaar APIs

Bring reliable Dutch tax context into your product

Reduce support load, improve user trust, and ship faster with tax data, calculations, and embedded experiences — built with the same year-versioned tax system behind Belastbaar.

What we can offer

Clear value today, with a path to deeper integration when you’re ready.

Year-versioned tax data

Access Dutch tax brackets, thresholds, and allowances by tax year — designed for predictable, structured integration.

Calculation services (partnership)

Discuss calculation endpoints and scenario comparisons tailored to your product’s user journeys.

Embedded experiences (roadmap)

Embeddable flows and widgets to add tax understanding directly into your UI — without forcing users to leave your product.

Integration models

Pick what fits your product and timeline.

API-first

Integrate via API endpoints for tax data, calculations, or tailored responses.

Embed widget

Drop in a branded/white-label widget (roadmap) for quick distribution and great UX.

Partnership

Co-design data, pricing, SLA, and compliance requirements with your team.

Where this helps

Teams using tax intelligence to reduce friction and increase trust.

Payroll & HR

Salary insights, expat scenarios, and employee-facing tax explanations.

Fintech & budgeting apps

Better net-income projections, scenario planning, and educational context.

Expat services

Accurate, bilingual tax guidance and 30% ruling related assistance.

Accountancy & advisory

Automation helpers, internal tooling, and structured tax references.

Principles

Accuracy and source discipline

We keep tax data centralized and versioned by year — so answers stay consistent and explainable.

Safe-by-default

Read-only patterns by default, with explicit authentication for account features.

Professional collaboration

We align on scope, timelines, and measurable outcomes before shipping — then iterate quickly.

FAQ

A few common questions from teams evaluating a partnership.

Let’s discuss your integration

Tell us what you’re building and what success looks like. We’ll propose the fastest path to a reliable integration.

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Belastbaar provides educational information about Dutch taxes. For official advice, always consult a qualified tax professional or the Dutch Tax Authority.

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