If you have agreed on a fixed gross salary with your employer, every tax reduction directly increases the amount of money that lands in your account. Here are some legal ways you can increase your monthly income.
Income tax is calculated only after your non-taxable "Personal deduction" is subtracted from your base. By adding certain factors, this non-taxable portion grows, which reduces the tax base.
Pro tip on redistribution!
If both partners work, children should be registered on the parent with the higher gross salary to maximize the non-taxable portion, as the parent with the lower salary might not have enough tax to be reduced at all.
It is cheaper for the employer to pay you certain allowances on which no contributions are paid than to increase your gross salary. This includes:
The state often offers certain tax exemptions or refunds of part of the tax for young people up to a certain age limit (e.g., up to 40 years for annual personal income tax).