Estimated personal income tax (taking into account taxable income from your permanent job)

Hello everyone, I have a question about personal income tax. Since I also have a permanent job, my total personal income tax will have to be calculated on my total income (once I have filed my tax return). It is possible that with 100 euro more taxable income, I will end up in a different tax bracket. Is it possible to use this tool to estimate your personal income tax, taking into account your other taxable income? Of course, this will never be exact, but it will give me a rough idea of what ‘surprises’ await me after I file my tax return. Thank you in advance for your help.