For entrepreneurs
Rekenbox Pro
€39/year
- Detailed PDF reports
- Save calculations and compare versions
Calculate. Create. Check.
All your financial tools,
in one place.
Know what you take home. Create your documents. Check your figures. Start free, without an account.
Calculate 19 tools
VAT calculatorAdd VAT to a price or extract it from a total.Profit marginCompare profit, margin and markup.Break-even revenueHow many sales cover your fixed costs?Loan repaymentMonthly payments and a complete repayment schedule.Margin scheme VATVAT on the positive margin of an eligible used item.DepreciationBook value, residual value and annual depreciation.Investment deductionSmall-scale investment deduction for 2026.Income taxFrom sole trader profit to income tax, healthcare contribution and net income.Provisional tax assessmentHow much remains to reserve for income tax and healthcare contribution?Freelance hourly rateA rate covering your net income, costs and tax.Gross to net salaryNet salary and holiday pay using payroll tax tables.Employer costsGross salary plus holiday allowance and employer contributions.Sole trader or limited companyCompare net income, tax and retained profits.Director salary and dividendCalculate salary, corporate tax and dividend in one overview.Holiday payGross holiday allowance and an estimated net payment.Minimum wageMinimum hourly wage and minimum pay for hours worked.Company car taxTaxable company car benefit and estimated net effect.Private or business carCompare annual car costs as a sole trader.Statutory interest and collection costsInterest by period and collection cost calculation.
Create 8 tools
Create invoiceEnter the details and download your PDF document.Create credit noteEnter the details and download your PDF document.Create quoteEnter the details and download your PDF document.Payment reminderCreate a reminder for an unpaid invoice.TimesheetRecord time by date and project, with totals and export.Mileage logTrips, odometer readings and business mileage in one export.Cash bookCash receipts, payments and running balance.SEPA payment fileCreate an XML file for euro transfers within the EEA.
Check 8 tools
XAF CheckerCheck auditfiles for balances, dates, VAT and references.Check UBL invoiceInvoice data, lines, VAT and totals from UBL XML.Check invoice amountsCheck entered invoice amounts, VAT and duplicate invoice numbers.Check IBANCheck country code, length and checksum.Check VAT numberCheck the format of a European VAT number.Normalise bank CSVConvert a bank export to consistent columns and dates.Check trial balanceCheck debit/credit, duplicate accounts and balance differences.Check payroll calculationCompare a regular payslip with the 2026 calculation table.
For entrepreneurs and advisers
A good conversation starts with clear figures.
Keep your scenarios, take a documented report with you or give clients a calculator on your website. Rekenbox works alongside your current bookkeeping.
Rekenbox
Start free. Get more from Pro.
All calculators, document makers and basic checks are free. Pay for reports, saved work and collaboration when you need them.
Single report · €19
For one decision or file. See the result and preview before paying. No account required.
Keep your existing bookkeeping
Rekenbox is a standalone product. You do not need a Winstwaker bookkeeping subscription.
For advisers
Rekenbox Professional
€249/year
- Detailed PDF reports
- Save calculations and compare versions
- Reports with your own branding
- 5 team members including owner
- 5 widgets on your own website
- 10,000 API calculations per month
- Bulk processing
For platforms and firms
Rekenbox White-label
€499/year
- Detailed PDF reports
- Save calculations and compare versions
- Reports with your own branding
- 10 team members including owner
- 25 widgets on your own website
- 100,000 API calculations per month
- Bulk processing
- Widgets without Rekenbox branding
Only need a widget or API?
For your own application
One Rekenbox widget
€99/year
- 1 widget on your own website
For your own application
Rekenbox API
€99/month
- 100,000 API calculations per month
- Bulk processing
Prices in euros, including applicable VAT. Subscriptions renew automatically and can be cancelled in your account for the next period. You can request a refund of your initial purchase within 14 days. There are no automatic overage charges above your API limit. Storage: 100 MB per personal or team workspace.
Try first, choose later
Use every free tool without signing in. Before paying for a report, you see your own results, the contents and the retention period. Pro requires an account to keep purchases, scenarios and your subscription in one place.