Calculate, create and check
All tools, results and available basic exports. Including creating and downloading an invoice. No account or payment details.
Browse all free tools →36 free tools · No account needed
Small money tasks. Sorted.
Create a credit note, explain a VAT rounding difference or open an accounting file. Free, without an account. You can also calculate Dutch income, hourly rates and business costs.
Your result is free. A report from €19 or saving with Pro is optional. No Winstwaker subscription required.
What do you need to do?
An answer you can use.
Free
Need to correct an invoice?
Create a full or partial credit note. Download PDF and UBL right away.
Open tool →FreeA cent difference in VAT?
Compare rounding per good or service with rounding on the total.
Open tool →FreeReceived an XML invoice?
Read UBL invoice lines and check the amounts. Export the lines as CSV.
Open tool →FreeNeed entries from an XAF file?
Open XAF 3.x or 4.0 locally and export entries to CSV for Excel.
Open tool →Calculate 20 tools
VAT calculatorAdd VAT to a price or extract it from a total.FreeProfit marginCompare profit, margin and markup.FreeBreak-even revenueHow many sales cover your fixed costs?FreeLoan repaymentMonthly payments and a complete repayment schedule.FreeMargin scheme VATVAT on the positive margin of an eligible used item.FreeDepreciationBook value, residual value and annual depreciation.FreeInvestment deductionSmall-scale investment deduction for 2026.FreeVAT rounding differenceCompare VAT rounded per good or service with VAT rounded on the total.FreeIncome taxFrom sole trader profit to income tax, healthcare contribution and net income.FreeProvisional tax assessmentHow much remains to reserve for income tax and healthcare contribution?FreeFreelance hourly rateA rate covering your net income, costs and tax.FreeGross to net salaryNet salary and holiday pay using payroll tax tables.FreeEmployer costsGross salary plus holiday allowance and employer contributions.FreeSole trader or limited companyCompare net income, tax and retained profits.FreeDirector salary and dividendCalculate salary, corporate tax and dividend in one overview.FreeHoliday payGross holiday allowance and an estimated net payment.FreeMinimum wageMinimum hourly wage and minimum pay for hours worked.FreeCompany car taxTaxable company car benefit and estimated net effect.FreePrivate or business carCompare annual car costs as a sole trader.FreeStatutory interest and collection costsInterest by period and collection cost calculation.Free
Create 8 tools
Create invoiceEnter the details and download your PDF document.FreeCreate credit noteEnter the details and download your PDF document.FreeCreate quoteEnter the details and download your PDF document.FreePayment reminderCreate a reminder for an unpaid invoice.FreeTimesheetRecord time by date and project, with totals and export.FreeMileage logTrips, odometer readings and business mileage in one export.FreeCash bookCash receipts, payments and running balance.FreeSEPA payment fileCreate an XML file for euro transfers within the EEA.Free
Check 8 tools
XAF CheckerCheck auditfiles for balances, dates, VAT and references.FreeCheck UBL invoiceInvoice data, lines, VAT and totals from UBL XML.FreeCheck invoice amountsCheck entered invoice amounts, VAT and duplicate invoice numbers.FreeCheck IBANCheck country code, length and checksum.FreeCheck VAT numberCheck the format of a European VAT number.FreeNormalise bank CSVConvert a bank export to consistent columns and dates.FreeCheck trial balanceCheck debit/credit, duplicate accounts and balance differences.FreeCheck payroll calculationCompare a regular payslip with the 2026 calculation table.Free
Clear about free and paid
Pay when you need more than the result.
A record for your files
A detailed PDF report with inputs, results, assumptions and sources. Useful when discussing a BV decision with your adviser. Preview your own report first.
Calculate and preview →Save and compare later
Save calculations in your account, compare versions and create reports. Useful when revisiting a rate or profit forecast.
See Pro and terms →Why do we charge?
Rekenbox is a commercial product by Winstwaker. Reports and subscriptions generate revenue and fund development, maintenance and support. Saved files, accounts, widgets and API requests also require server capacity and operation.
When is free enough?
If you only need a calculation, a document or a file check, you do not need a paid plan. Payment adds record keeping and reuse; it does not turn a calculation into personal tax advice.
For firms: Professional (€249 per year) adds branding, teamwork, bulk checks, widgets and API access. Compare plans →
Rekenbox · 2026
VAT rounding difference: per line or total
Compare VAT rounded per good or service with VAT rounded on the total.Free · No accountGuide & example ↓
The comparison, amounts per entry and CSV download are free and run on your own device.
The free tool runs on your device. A report or saving in your account is optional and uses server storage. What costs money, and why?Understand your result
How this tool works
A VAT difference can result from rounding each supplied good or service or rounding only on the total. Enter one net amount per good or service and choose the rate for all entries. See both VAT amounts, their difference and both gross totals. Compare each rate group separately when rates are mixed. This comparison explains only this rounding effect; discounts, other taxable bases or input errors can also cause differences.
Common questions
Can I choose whichever VAT amount is lower?
The Dutch Tax Administration permits both methods but requires consistent use of one approach. Do not switch between invoices to obtain the lowest amount. The source linked to this tool explains the rule.
Is this the same as rounding a VAT return?
No. This tool compares invoice amounts in cents. VAT returns have separate whole-euro rounding rules. This tool also does not check mixed VAT rates in a single calculation.
Which details do you need?
- VAT rate for these entries
- Goods or services
Assumptions and scope
- Enter one net amount in cents per supplied good or service. All entries use the same rate. Compare mixed rates separately.
- The Dutch Tax Administration permits both rounding methods. Use one method consistently; do not switch to choose the lowest amount. This is not a VAT return calculation.
Year: 2026 · Version 2026.1
Sources for this tool
- Belastingdienst — Btw-bedrag afronden · calculation source checked 2026-09-05
Rekenbox is a product by Winstwaker. The tool applies a calculation model to your inputs; a result or paid report is not a personal assessment by an adviser.