Changelog
A timeline of every update to NumBoxHub — new calculators, data refreshes, content improvements, and bug fixes.
June 2026
Added 12 new guides across US & German content
Includes how to negotiate salary, retirement planning basics, stock options & taxes, overtime pay, and German guides on parental allowance, unemployment benefits, and Christmas bonus taxation.
Launched Glossary page
Centralized financial and tax terminology reference covering US and German tax terms, retirement accounts, payroll concepts, and investment vocabulary.
Updated sitemap.xml
Added all new guide URLs, state-level calculator pages, and static pages for better indexing.
May 2026
Initial release of all calculators
Launched US Federal Tax Estimator, Paycheck Calculator, Retirement Calculator, Capital Gains Calculator, Hourly-to-Salary Calculator, German Brutto-Netto Rechner, Gehaltsrechner, Mehrwertsteuer Rechner, Abgeltungsteuer Rechner, Riester-Rente Rechner, Compound Interest Calculator, Loan Calculator, and Tip Calculator — all with 2026 tax data.
Added 50 US state-level pages
State-specific paycheck calculators covering all 50 states and DC with local tax rates and simplified assumptions.
Published Methodology page
Documented calculation methods, data sources, and accuracy verification processes for all tools.
Published US and German guide libraries
14 English guides and 10 German guides covering tax brackets, deductions, Social Security, church tax, social contributions, and more.
April 2026
Project started
Began development of NumBoxHub as an independent financial calculator project focused on US and German tax planning tools.
How to Report Issues
Found a calculation error or outdated tax data? Report it via our contact page. Include the calculator page URL, your input values, expected result, and the official source you're comparing against. We aim to respond within 3 business days and update affected calculators promptly.