Failure to file a tax return by the deadline will result in a penalty of up to 10% of the tax due, up to a maximum of EUR 25,000. Additional fines may also be imposed.
Late tax payments are subject to an interest penalty 0.6% per month. If an extension is granted by the tax authorities, the late payment interest penalty is reduced to 0 - 0.2%.
Irregularities in a return can result in penalties EUR ranging from 5% to 25% of the underpaid tax or undue refund.
When an incorrect return is filed for the purpose of evading tax, a penalty of 4 times the tax evaded is imposed. For more serious cases of fraud, a penalty of 10 time the tax evaded is imposed, as well as potential imprisonment of 1 month up to 5 years.