Practical guides for work and business
Use these guides to check a deadline, understand a tax estimate or interpret a file check. Related tools are labeled so you can go straight to the task.
Tax & finance
Look up the rates for your filing status, then try a calculation with your own figures.
- Guide
2027 Federal Income Tax Brackets and Standard Deduction
See the 2027 IRS tax brackets for each filing status, compare the 2026 and 2027 standard deductions, and work through a federal tax example.
- Tool
Federal Income Tax Calculator
Estimate US federal tax for 2026 or 2027 and see how much income falls into each bracket.
- Tool
US State Tax Calculators
Choose a state to estimate income or sales tax and see which local rules the calculator covers.
E-invoicing & business compliance
Start with the country and transaction type. A deadline check and a file validation answer different questions.
- Guide · DE
ZUGFeRD vs. XRechnung 2027: Unterschiede, Anforderungen und kostenlose Prüfung
Wann passt ZUGFeRD, wann XRechnung? So prüfen Sie PDF und XML, finden typische Fehler und berücksichtigen die deutsche Übergangsregelung.
- Guide · ES
VERI*FACTU 2027: Fechas, requisitos y quién está obligado
Consulta qué plazos de VERI*FACTU siguen en vigor, quién debe adaptar su software, qué excepciones existen y cómo preparar tu facturación.
- Guide · FR
Facturation électronique 2027 : obligations, calendrier et préparation des PME
Les PME et micro-entreprises passent à l’émission et au e-reporting en septembre 2027. Découvrez comment préparer vos factures et votre plateforme.
- Guide
Making Tax Digital April 2027: Who Must Join and How to Prepare
Check whether April 2027 Making Tax Digital applies to your self-employment or rental income. See how to prepare software, records and updates.
- Tool · DE
E-Rechnungspflicht 2027 prüfen
Fristen, Umsatzgrenzen und Ausnahmen für inländische B2B-Umsätze in Deutschland prüfen.
- Tool · DE
ZUGFeRD-Validator
Hybridrechnungen auf PDF/A und eingebettete Rechnungsdaten prüfen.
PDF & document guides
Understand what a PDF check found and which issues need manual review.
International compliance deadlines
Compare deadlines across markets, with a government source and a preparation step for each entry.