Speaking as a German. Filing tax forms is almost always a good idea for salaried workers because of the plethora of expenses that can be deducted from your tax

Speaking as a German. Filing tax forms is almost always a good idea for salaried workers because of the plethora of expenses that can be deducted from your taxable income: - handyman bills - expenses for the commute to work - donations to political parties and registered charities (I save 400€ in taxes on that item alone because of regular donations to my hackerspace) - some types of insurance premiums - etc.