KUDTAX TOOLS
KudTax Tools & Utilities
Free interactive tools for online sellers, tax advisors, and accountants.
DATEV Export Validator
Free online tool to validate DATEV EXTF files (ASCII/CSV). Check headers, data row syntax, and field formats before sending to your tax advisor.
Amazon Fee Calculator
Calculate Amazon FBA fulfillment fees, referral fees, margins, and net profits per product for EU marketplaces.
VAT Calculator (Gross / Net)
Calculate gross, net, and Value Added Tax (VAT) values instantly for Germany (19% / 7%) and standard EU tax rates.
EU VAT Number Validator
Validate EU VAT identification number format and syntax for cross-border B2B compliance.
WHY KUDTAX TOOLS?
Free E-Commerce Accounting Tools for Merchants & Tax Advisors
GoBD-Compliant Validation
Compliance with GoBD guidelines is essential when compiling accounting stacks. Our online tools help verify syntax, amounts, and field structures before exporting.
DATEV Interfaces & EXTF Formats
Prevent costly booking errors and tax advisor rejections. Validate DATEV EXTF headers, consultant numbers, and fiscal year constraints directly in browser.
Accurate Fee & Margin Calculations
Calculate Amazon FBA fulfillment costs, referral fees, and unit net profit margins across German, European, and global marketplaces.
100% Local Data Processing
Privacy first: All calculations and file validations run 100% locally inside your web browser. No confidential accounting or customer data is uploaded to external servers.