Second Job and Tax Class 6 in Germany: Why Your Side Hustle Net Income Feels So Low

Why a second job in Germany is usually taxed in Tax Class 6

The German wage tax system operates on a central assumption: every employee has one primary employment relationship. This main job is taxed according to Tax Classes I through V. In these classes, various legal tax-free allowances—most notably the basic tax-free allowance (Grundfreibetrag), which ensures a subsistence level of income is exempt from taxation—are fully applied.

As soon as you take on a second, third, or any additional job that is subject to social security contributions, the tax office cannot grant these allowances a second time. This is managed via the electronic system known as ELStAM (Elektronische Lohnsteuerabzugsmerkmale). Because your primary employer is already utilizing your personal tax-free allowance, the tax office has no way to apply it again to your secondary income. Consequently, every subsequent employer is legally required by the tax authorities to register you in Tax Class 6.

The core issue with Tax Class 6 is the complete absence of personal relief amounts. It acts as an "accumulator" tax class designed to capture taxes on supplementary income without allowing for the standard deductions that make your primary paycheck feel more manageable.

How heavily Tax Class 6 can reduce your monthly net income

• Zero Basic Tax-Free Allowance: While a significant portion of your income in your main job remains tax-free up to the subsistence level, in Tax Class 6, wage tax is deducted starting from the very first euro you earn.
• No Child Tax-Free Allowances: These are strictly linked to your primary tax class and are not applied to secondary employment.
• No Employee Lump Sum (Arbeitnehmerpauschbetrag): The standard deduction for work-related expenses is fully utilized in your main job and cannot be doubled for the same calendar year.

Through this system, the tax office secures a precautionary, high advance payment on your total annual income. This protects the state against potential tax underpayments at the end of the year. While it acts as a safeguard for the government, for the individual employee, it results in a seemingly disproportionate, heavy monthly deduction.

When to distinguish between Minijobs, part-time second jobs, and classic side jobs

For many, the deduction in Tax Class 6 feels like a punitive tax rather than a withholding measure. While Tax Class 6 is progressive just like the others, it effectively pushes your total income into a higher bracket much faster. Because it starts from a tax-free allowance of zero, the tax progression bites immediately and with maximum intensity.

Beyond wage tax, if the side job is a regular position subject to social security, you must also pay standard contributions for health insurance, pension insurance, long-term care insurance, and unemployment insurance. When you combine these with the solidarity surcharge (if applicable) and church tax, the total deduction rate on your second job can easily exceed 50 to 60 percent of the gross amount. It is not uncommon for employees to receive less than half of their gross second-job earnings in their bank account.

To get a better idea of how different tax classes impact your specific situation, it is recommended to use specialized calculators. You can analyze your tax class distribution using our Tax Class Calculator for Germany, while our Gross-Net Calculator for Germany can provide a precise simulation of potential deductions based on your specific gross wage.

Disclaimer: All online values and calculations are provided as non-binding estimates. The final tax assessment and the exact determination of your tax burden take place exclusively through your annual income tax return (Einkommensteuererklärung) processed by your local tax office.

1. The Minijob (Marginal employment)

Not every side hustle automatically leads into the Tax Class 6 trap. The consequences depend entirely on the legal and financial structure of the employment contract. Understanding these categories is essential for financial planning.

2. The second job subject to social security contributions

The Minijob is the gold standard for those who want to earn extra money without the complications of Tax Class 6. The current statutory limit is 538 euros per month (as of 2024). This limit is dynamic and linked to the minimum wage; it will adjust automatically if the minimum wage rises. As long as your monthly income does not exceed this limit, the job remains tax-free for you and generally exempt from social security contributions. The employer pays a flat-rate tax (usually 2 percent), which covers the tax liability. The Minijob does not appear on your electronic tax card (ELStAM) and does not force you into Tax Class 6.

Practical comparison: Minijob vs. Tax Class 6

If you earn more than 538 euros but no more than 2,000 euros (the "transition zone" or *Übergangsbereich*), you are in a Midijob. Here, you pay reduced social security contributions compared to a full-time job, but your tax situation changes. If this is a secondary job, you are still subject to Tax Class 6. However, because you are still below the full contribution threshold, your net pay might be slightly higher than in a full-time position, though it still carries the burden of the high tax withholding rate.

Common misconceptions regarding side jobs and net income planning

Once you cross the threshold of a Minijob (and do not fall into a specific exempt category), the position becomes a regular employment relationship. It is fully subject to taxes and social security contributions. In this case, Tax Class 6 is mandatory for the second job. Your main job remains unaffected in its original tax class.

Misconception 1: "The money from Tax Class 6 is lost forever"

The following example illustrates the difference between an optimized Minijob and a regular second job under Tax Class 6 for a single person (Tax Class I in their main job).

*Note: This assumes the employee opts out of pension insurance contributions for the Minijob. Also, note that for married couples, if you hold a combination like Tax Class III/V, your tax burden on a second job may fluctuate significantly due to the overall household income level, making Tax Class 6 calculations complex.

The example above highlights the classic paradox: working more (Scenario B) can initially lead to a lower monthly bank balance than working a controlled Minijob. However, remember that the "missing" tax money in Scenario B is not lost—it is simply a prepayment to the state.

Misconception 2: "A second job isn't worth it because of Tax Class 6"

When dealing with secondary income, several myths can cloud your judgment. Understanding the reality of the system helps you make better decisions about your career and financial health.

Misconception 3: "I can simply combine two Minijobs tax-free"

This is the most dangerous misconception. Tax Class 6 is a withholding tax, not a final tax. At the end of the year, you are required (or strongly advised) to file an income tax return (*Einkommensteuererklärung*). The tax office then calculates your actual tax liability based on your total annual income from all sources. Because the system withholds taxes as if you are earning at a high rate all year, you will almost certainly have overpaid. This overpayment is returned to you as a tax refund. You are essentially providing an interest-free loan to the government throughout the year.

Myth 2: "I should avoid a second job because of the high deductions."

While the monthly cash flow in Tax Class 6 is frustrating, mathematically, earning more gross income always results in higher total annual net income. The tax progression might feel punitive, but it cannot eat up 100 percent of your earnings. You simply need to account for the fact that a portion of your income is deferred until you file your taxes. If you need liquidity *today*, a Minijob is better. If you are looking for total annual wealth growth, a regular second job is still a net positive.

Myth 3: "I can hide my second job from my main employer."

In Germany, your main employer will typically see that you have a second job, as both employment relationships are linked via the ELStAM system. While you generally do not need "permission" to take a second job (unless specified in your contract or if it conflicts with the Working Hours Act), your main employer will be aware of the existence of another tax liability. It is usually best to check your employment contract regarding secondary employment clauses (*Nebentätigkeitsklausel*) to avoid contractual issues, regardless of the tax implications.

How to reclaim overpaid taxes: A step-by-step guide

Since you are in Tax Class 6, the tax office forces you to file a tax return because there is a high probability of tax discrepancies. Here is how you can ensure you get your money back:

1. Collect your documents: Wait until the beginning of the following year. Your employers will submit your *Lohnsteuerbescheinigung* (Wage Tax Statement) to the tax office electronically, and you will receive a copy.
2. Use Tax Software: Do not try to calculate this on paper. Use certified ELSTER-based tax software or online tax portals. These tools automatically import your data from the tax office and calculate exactly how much Tax Class 6 deduction was "excessive."
3. Include all expenses: During your tax return, you can deduct income-related expenses (*Werbungskosten*) from your second job. These include travel costs, equipment, or home office expenses, further lowering your taxable income and increasing your potential refund.
4. Submit early: The sooner you submit, the sooner you get your refund. The tax office typically processes these returns within 6 to 12 weeks.

Frequently Asked Questions (FAQ)

Can I switch my second job out of Tax Class 6?

No. Tax Class 6 is mandatory for any secondary employment. You cannot request that the tax office switch your secondary job to Tax Class 1 or 4.

What happens if I have three jobs?

One job remains in your primary tax class (usually the one with the highest salary to minimize withholding). All subsequent jobs will automatically fall into Tax Class 6.

Will my tax refund be huge?

It depends on your total annual income. If your total annual income from both jobs does not push you into a high tax bracket, you might get a significant portion of the Tax Class 6 deductions back. If your combined income is very high, you might owe additional tax or receive a smaller refund. Always use a simulation tool before counting on a refund.

What if I quit my main job?

If you quit your main job and keep your "second" job, that job becomes your only job. You must notify your employer and the tax office so that they move your primary job out of Tax Class 6 and into the correct primary tax class (e.g., Tax Class 1). This is crucial, or you will continue to be taxed at the Class 6 rate unnecessarily.

In summary: If you want to boost your monthly income quickly and without bureaucratic hassle, a classic Minijob up to the statutory limit is the best approach. If you intend to work more and earn a higher gross amount, you must be prepared to accept the temporary financial "pain" of Tax Class 6, knowing that this is a timing issue rather than a loss of earnings. With a properly filed tax return, the system corrects itself, and the "missing" net income finds its way back to your bank account.

For a detailed overview of what you can actually expect to keep, we recommend checking out our comprehensive guide on related calculator.