There is no income tax liability if your taxable income does not exceed the basic allowance. The basic tax-free amount for single taxpayers is € 9,744 in 2021. For jointly assessed spouses/life partners, the basic allowance doubles to €19,488. If your income exceeds the basic allowance, the incurrence of an income tax liability depends on the type of income received in the specific individual case. For example, every employee is entitled to a lump-sum employee allowance of € 1,000.
You can determine your expected income tax using the wage and income tax calculator of the Federal Ministry of Finance.