Skip to content
Tax Declaration

Tax Declaration 2025: What Business Owners in Germany Need to Know

BM Wirtschaftskanzlei

Key Deadlines for 2025

The German tax system has firm deadlines that business owners must respect. Missing them can result in surcharges and penalties.

For the 2024 tax year:

  • Without tax advisor: Submission deadline is September 1, 2025
  • With tax advisor: Extended deadline until May 31, 2026
  • VAT advance returns: Monthly or quarterly, depending on your previous year’s VAT liability

Working with a professional tax advisor like Bajc & Kollegen (our certified partner) automatically extends your deadline by several months — one of many practical advantages.

What You Need to Prepare

Gathering documents early makes the entire process smoother:

  • Income records: Revenue statements, invoices issued
  • Expense documentation: All business-related receipts, subscriptions, insurance
  • Bank statements: Complete statements for all business accounts
  • Payroll documents: If you employ staff
  • Asset records: Purchases, depreciation schedules
  • Previous year’s tax assessment: For reference and carry-forward items

Pro tip: With BM Wirtschaftskanzlei’s digital workflow, most of this is already captured throughout the year. Clients who use our ongoing bookkeeping service have their tax declaration prepared with minimal additional effort.

Common Mistakes to Avoid

  1. Mixing private and business expenses. Keep strict separation — it’s the number one audit trigger.
  2. Forgetting deductible items. Home office costs, professional development, travel — many legitimate deductions go unclaimed.
  3. Late submission. Even with an extension, don’t wait until the last week. Quality suffers under time pressure.
  4. Not planning ahead. Tax optimization works best when you plan before year-end, not after.

How BM Wirtschaftskanzlei Helps

We handle the entire process: from ongoing bookkeeping throughout the year to preparing your annual financial statements and coordinating with Bajc & Kollegen for the final tax submission. All digital, all transparent, with a dedicated contact person.

Questions about your 2025 tax declaration? Contact us — we’re happy to help.