Hi,
Not sure what you mean, but here are two possible options:
If you are inheriting something, then the tax calculator is here. And FWIW, any amount is too high, especially on inheritance gathered through earned incomes (product of labour). Here's the link:
https://prosentti.vero.fi/Pelalaskuri/E ... overo.aspx . At the bottom, there is the
Perintöverolaskuri
If you are getting some "advance of inheritance" as you say, I am not sure of that. The quickest that I can think of is as a "gift", which is also as far as I know subject to taxes!

Again as far as I remember, there was a tax-free limit, was it 6000 Eur/ year from a parent to a child. (Disclaimer: I am NOT sure of this, so you need to check this).
Hope this helps.