Why This Topic Matters for Everyone
Over 4.5 million people in Germany earn income alongside their main employment. Whether it is a Minijob at a retail store, freelance writing, a small e-commerce shop, or rental income from an inherited apartment, the tax consequences vary dramatically depending on the type of side income. Many employees leave hundreds of euros on the table each year because they do not understand the rules or choose a suboptimal income structure.
This comprehensive guide covers all relevant income types, their tax treatment in 2026, the obligations toward the tax authorities, and the best strategies to maximize your net take-home pay. All information is based on the current German Income Tax Act (EStG) and social insurance regulations as of 2026.
Overview of Income Types
German tax law distinguishes seven types of income (section 2 EStG). For side activities, the most relevant are: income from employment (Minijob, Midijob, second job with tax class VI), income from self-employment (freelancers), income from trade or business (commercial side activities), income from renting and leasing, and income from capital assets (interest, dividends, stock gains).
Each income type has its own rules for taxation, social contributions, allowances, and reporting obligations. Choosing the right structure can mean the difference between 0% and 42% tax burden on your side earnings.
The Minijob: Tax-Free Up to EUR 520
The Minijob (marginal employment under section 8 SGB IV) is the most popular form of side income in Germany. Approximately 7 million people hold a Minijob, about 4 million of them alongside a main job. For the employee, a Minijob is completely free of taxes and social contributions. The employer pays flat-rate charges totaling about 30%: 2% flat tax, 15% pension insurance, 13% health insurance, and various levies.
The EUR 520 Limit
Since October 2022, the Minijob threshold has been EUR 520 per month (EUR 6,240 annually). This limit is dynamically linked to the statutory minimum wage. Monthly earnings may exceed EUR 520 in individual months as long as the annual average stays within bounds. Occasional unforeseeable overages are permitted in a maximum of 2 months per calendar year.
Pension Insurance Obligation
Since 2013, Minijob holders are subject to mandatory pension insurance. The employee contribution is 3.6% of gross earnings (EUR 18.72 at EUR 520). In return, you earn full pension credits and waiting time months. You can opt out by submitting a written exemption request to your employer, but you then lose these pension benefits.
Multiple Minijobs
You may hold multiple Minijobs as long as total earnings do not exceed EUR 520 per month. Alongside a main job subject to social insurance, only one Minijob is exempt. Any additional Minijob is combined with the main job and subject to full social contributions and tax class VI.
The Midijob: Transition Zone EUR 520.01 to EUR 2,000
Earnings between EUR 520.01 and EUR 2,000 per month fall into the transition zone (formerly sliding scale). Employee social contributions start near 0% at EUR 520.01 and increase linearly to the full rate at EUR 2,000, while the employer pays the full rate from the start. This makes the Midijob significantly cheaper for employees than regular employment.
Tax-wise, a Midijob as a second job runs through tax class VI, leading to high monthly deductions that can largely be recovered through the annual tax return.
Second Job with Tax Class VI
Any second regular employment beyond the Minijob threshold is automatically assigned tax class VI. This class has no basic tax-free allowance (EUR 12,084 in 2026), no employee expense allowance, and no social insurance deduction allowance. Every euro is taxed from the first euro, resulting in withholdings of typically 25-40% of gross.
The Annual Tax Return as Remedy
In the annual tax return, all income is combined and the actual tax liability calculated. Tax class VI withholdings are often too high, and employees typically receive EUR 500 to EUR 2,000 back. Filing a tax return is almost always worthwhile with a second job.
Freelance Side Activity
Freelancers (section 18 EStG) include writers, designers, consultants, teachers, translators, programmers, artists, and journalists. Freelancers do not pay trade tax and do not need to register a business. They prepare a simple income statement (Einnahmen-Ueberschuss-Rechnung) and can deduct all business-related expenses.
Social Insurance
Side income from freelancing is generally exempt from social insurance as long as your main job is subject to social insurance and the freelance work is truly part-time (less than 20 hours per week, income below main job income).
Registration with the Tax Office
Within one month of starting, you must submit the tax registration questionnaire via ELSTER. The tax office will assign a tax number for your freelance activity.
Commercial Side Activity
Selling goods, providing trade services, or running an online shop generates commercial income (section 15 EStG) and requires a trade registration (Gewerbeanmeldung) at the local trade office (EUR 20-60). Trade tax applies only above a profit threshold of EUR 24,500 annually and is credited against income tax for sole proprietors.
Small Business Regulation (Section 19 UStG)
The Kleinunternehmerregelung exempts self-employed individuals from charging and remitting VAT if annual revenue in the previous year was below EUR 22,000 and is projected to stay below EUR 50,000 in the current year. The main advantage is simplicity: no VAT returns, no VAT on invoices. The main disadvantage is that input VAT on business purchases cannot be reclaimed.
Rental Income as Side Income
Rental income is taxed as income from renting and leasing (section 21 EStG) at your personal income tax rate. No social contributions apply. The tax burden can be substantially reduced through deductible expenses: loan interest, depreciation (AfA, typically 2% of building value per year), maintenance costs, property tax, management fees, insurance, and travel costs to the property.
Capital Gains
Interest, dividends, and stock gains are subject to a flat withholding tax of 25% plus solidarity surcharge (total approximately 26.375% without church tax). Each taxpayer has a saver's allowance of EUR 1,000 (EUR 2,000 for joint filers). Below this threshold, capital gains are tax-free. If your personal income tax rate is below 25%, you can claim a more favorable assessment (Guenstigerpruefung) through your tax return.
Tax Return Obligations
A tax return is mandatory if side income (excluding Minijobs) exceeds EUR 410 per year. For self-employment or rental income, filing is always required. Key attachments include: Anlage N (employment income), Anlage S (self-employment), Anlage G (trade income), Anlage V (rental income), and Anlage KAP (capital gains). The deadline for the 2025 return is July 31, 2026.
Social Insurance with Side Activities
Alongside full-time employment, freelance side income is exempt from social insurance as long as it remains truly part-time. Only one Minijob is social-insurance-free alongside a main job. The contribution assessment ceiling (2026: EUR 5,175 monthly in western states) applies as the upper limit across all employments combined.
Common Mistakes and Pitfalls
Not informing your employer: most employment contracts require disclosure of side activities. Bogus self-employment (Scheinselbststaendigkeit): working exclusively for one client while being integrated into their operations risks reclassification with severe consequences. Forgetting VAT: exceeding the EUR 22,000 threshold without charging VAT constitutes tax evasion. Not documenting expenses: without receipts, no deductions. Ignoring tax prepayments: the tax office may demand quarterly advance payments if expected annual liability exceeds EUR 400.
Optimization Strategies
Choose the right structure: Minijob for earnings up to EUR 520, freelancing for higher earnings with deductible expenses, commercial activity only when trade tax is neutralized by the EUR 24,500 threshold. Maximize business deductions: equipment, travel, training, home office. Use the investment deduction (Investitionsabzugsbetrag) for planned purchases. Our calculator helps you compare all options for your personal situation.
Conclusion
The most tax-efficient side activity depends on your individual circumstances: main income level, type of activity, time commitment, and investment needs. The Minijob remains the simplest and most tax-friendly option for small amounts. For higher earnings, freelancing offers the greatest flexibility and tax optimization potential. Use our calculator to compare the different options for your personal situation.