On booxx.nl you'll find five free calculators for freelancers (zzp'ers) in the Netherlands, using 2026 rates and the same calculation core as the accounting software booxx: what you keep after Dutch income tax and the Zvw contribution, the minimum hourly rate you need, whether you meet the hours criterion of 1,225 hours, how much VAT is in an amount, and how much small-scale investment deduction (KIA) an investment gives you. With €50,000 turnover and €5,000 costs you keep about €3,132 a month in 2026, if you meet the hours criterion. If you want €3,000 a month net, with 1,100 billable hours and €5,000 costs you need to charge at least about €43.07 an hour excluding VAT. They work without an account, in Dutch, English, Polish, Hungarian and Romanian.
The essentials
Net income calculator
Turnover and costs in; income tax, Zvw contribution and net income per year and per month out.
Hourly rate calculator
Desired net income, billable hours, weeks and costs in; profit, turnover and minimum hourly rate out.
Hours criterion
Hours per week and weeks in; whether you reach 1,225 hours and whether the second condition applies to you.
Calculate VAT
An amount with or without VAT, at 21%, 9% or 0%: the three lines of your invoice.
KIA
Investment and profit in; the deduction from the 2026 table and what it saves in tax.
Price and languages
Free, no account; in Dutch, English, Polish, Hungarian and Romanian.
Which calculator for which question
Just starting out? Work out your hourly rate first: it is the floor at which you can live from your work. Already running your business? The net income calculator shows what is left of your profit and how much to set aside each month for the assessment.
The hours check tells you whether you are entitled to the self-employed deduction; if you do not meet the hours criterion, you lose it. The VAT calculator is for every invoice, and the KIA calculator for the moment you buy tools, a laptop or a van.
What the calculators assume
The net income, hourly rate and KIA calculators use the 2026 rates and tax credits and assume you are below the Dutch state pension age and have no other income and no tax partner besides your business. Anything else a calculator assumes is stated underneath it. If that does not fit your situation, the result is an indication, not your assessment.
Tax amounts are rounded to whole euros; the VAT calculator works in cents, as on an invoice.
From one sum to your whole year
A calculator works once with the figures you type in. In booxx those figures come from your own books: turnover from your invoices, costs from your receipts and your bank. The IB & Zvw reservation screen uses the same calculation to work out what to set aside for the assessment. You can try it for 90 days without a payment method.
Updated October 2, 2026. General explanation of the Dutch rules, not tax advice — for your own situation, decide together with your accountant or the Dutch Tax Administration.
Frequently asked questions
Are the calculators free?
Yes. You do not need an account: enter your figures and see the result straight away, in Dutch, English, Polish, Hungarian or Romanian.
Which rates do the calculators use?
Those for 2026: the income tax brackets, the general tax credit and the labour tax credit, the 4.85% Zvw contribution, the €1,200 self-employed deduction and the 12.7% SME profit exemption. It is the same calculation as in the accounting software booxx, and a check makes sure the two stay equal to the cent.
Can I use the result for my tax return?
No, it is an indication. Your return is about your actual figures for the whole year, and a tax partner, your own home or other income can change the result. If in doubt, ask the Dutch tax office (Belastingdienst) or an accountant.
Create a set of books, send your first invoice and see whether it works for you. The first 90 days are free and no payment method is asked for, so there is nothing to cancel later.