Why Side Freelancing Is Booming
More and more employees in Germany are starting freelance work alongside their main job. Reasons include additional income, building a second pillar, pursuing creative ideas, or gradually transitioning to full self-employment. Digitalization has dramatically lowered the entry barrier -- a laptop and internet connection suffice for many activities.
However, starting as a part-time freelancer comes with legal and tax obligations you should understand before writing your first invoice.
Step 1: Freelance vs. Trade
Not every self-employment qualifies as freelance. The Income Tax Act (section 18 EStG) defines liberal professions as: scientific, artistic, literary, educational, or teaching activities. Specifically: doctors, architects, engineers, lawyers, tax advisors, journalists, translators, designers, programmers (debated -- assessed by complexity), teachers, artists, and consultants with specialized expertise. If you do not fall under liberal professions, you must register a trade.
Step 2: Tax Office Registration
Within one month of starting, submit the tax registration questionnaire (Fragebogen zur steuerlichen Erfassung) via ELSTER. Key information includes: type of activity, projected income for the founding year and following year, small business regulation election (yes or no), and bank details for refunds. The tax office assigns a tax number for your freelance activity.
Step 3: Inform Your Employer
Most employment contracts contain a clause requiring disclosure or approval of side activities. Your employer may only refuse for legitimate reasons: direct competition, endangering work performance, or violation of the Working Time Act (maximum 48 hours total per week). Document the notification and approval in writing.
Step 4: Income Statement (EUER)
Freelancers prepare a simple income statement: Revenue minus business expenses equals profit. The profit is taxed at your personal income tax rate.
Commonly Overlooked Deductions
Computer, tablet, smartphone (at least 50% business use), software and cloud services, proportional internet and phone costs (typically 40-60% for mixed use), home office allowance (EUR 6 per day, maximum EUR 1,260 annually), professional literature and online courses, travel costs to clients (EUR 0.30 per km), office supplies, professional liability insurance, and professional association fees.
Step 5: Taxes and Advance Payments
Freelance profit is added to your total income and taxed at your marginal rate. Since income tax is already withheld from your main job, the side income typically faces a marginal rate of 30-42%. The tax office may require quarterly advance payments if the expected annual liability exceeds EUR 400. Set aside 30-40% of net profit for taxes.
Step 6: Writing Proper Invoices
Every invoice must contain: full name and address of provider and client, tax number or VAT ID, sequential invoice number, invoice date, service period, description and scope of service, net amount, and either VAT (19% or 7%) or the small business regulation reference.
Common Pitfalls
Bogus self-employment: working exclusively for one client risks reclassification. Working Time Act: total hours (main job plus freelancing) must not exceed 48 hours per week on average. Missing tax reserves: failing to plan for quarterly advance payments and annual settlements. Underpricing: many part-time freelancers undercharge by ignoring overhead costs.
Conclusion
Freelancing alongside your main job can be a lucrative second pillar if you understand and follow the tax and legal framework. Registration is straightforward, bookkeeping manageable, and the tax optimization options (business deductions, small business regulation, home office) are diverse. Start with a realistic assessment of your capacity and pricing -- our side income tax calculator helps with the numbers.