Side Business in Germany 2026: Part-Time Self-Employment Explained

Testing an idea as a software engineer, designer or coach on the side without quitting your full-time job — for many in 2026, that's the first step toward a real business in Germany. The catch: tax, social security and labor law all treat part-time self-employment differently than full-time. Get it wrong and you risk back-payments, employer warnings, or a forced reclassification by your health insurer. Here is the plan.

When does self-employment count as 'part-time'?

There is no fixed income threshold. What matters is the ratio between your main job and side activity:

• Less than 20 hours per week of self-employed work
• Side income regularly lower than your main-job income
• Your main job remains your livelihood

As soon as one of those flips, your insurer can reclassify you as primarily self-employed — with significantly higher contributions. See Freelancer vs. Trader for the boundary.

Do you need your employer's permission?

There is no blanket approval requirement, but:

• Read your employment contract — many include disclosure or approval clauses.
• Non-compete: you can't run a competing activity. Coding for the same customer outside work is off-limits.
• Working time act: combined hours with your main job can't exceed 48 per week (4-month average).
• Vacation rules: no comparable activity during paid time off (§ 8 BUrlG).

Rule of thumb: telling your employer is always safer than starting in secret.

Registration: Trade or Liberal Profession?

Depends on the activity:

• Liberal profession (Freiberufler) — programmers, designers, coaches, copywriters, consultants: just notify the tax office via the tax registration questionnaire.
• Trade (Gewerbe) — retail, sales, services outside the catalog: file a Gewerbeanmeldung at the trade office (€20–65). The tax office and chamber of commerce are notified automatically.

Mixed activity? You'll need both. When unclear, call the Finanzamt — it's free.

Health insurance: the 20-hour rule and income limits

The 2026 thresholds that matter:

• < 20h/week + side income < main income = part-time, your main-job insurance keeps applying.
• Family-insured (mitversichert)? Self-employment income capped at €505/month (€608 with the standard expense allowance). Above that, you must take out your own membership.
• Bezugsgröße 2026 sets the bar for primary self-employment assessment — 75 % of it is about €2,800/month.

Once your side income exceeds your main income, or you regularly hit 20+ hours, you can be reclassified as primarily self-employed. Notify your insurer of changes — back-payments are expensive.

Taxes: income tax, VAT and the small-business rule

Three things to handle:

• Income tax: both incomes are assessed jointly. Your side income lands in the top marginal rate of your main job — budget 35–45 %. See estimated tax payments for the self-employed.
• VAT: if prior-year revenue was under €25,000 and current-year projected under €100,000, the Kleinunternehmer rule applies — no VAT on invoices, no input deduction.
• Trade tax (Gewerbe only): €24,500/year allowance. Most side businesses stay under it.

If your side activity is going to last more than 6 months, build a rough tax estimate up front. Otherwise the year-end assessment hits hard.

Bookkeeping — even a side hustle needs receipts

Side or full-time, every invoice must include the legally required fields. From 2025, domestic B2B sales must use structured e-invoices. Receipts must be collected digitally per GoBD and kept 8 years. Excel ages out fast for a real side business — bookkeeping software with receipt scanning and automatic EÜR is standard.

Conclusion

Going part-time self-employed in Germany in 2026 is the most pragmatic path to a real business: low risk, salary backing, real market testing. Three routines do the heavy lifting — notify your insurer, stay under the hour and income thresholds, run clean books from day one. Norman gives you free bookkeeping and invoicing — perfect for testing a side business without overhead.