I have a client that will inherit the proceeds from the sale of property.  I understand that this will be entered on their tax return.  The issue is the sale may have completed the end of the year but they will not get their proceeds till 2021.  Do they claim the income on 2020 return or 2021 when the proceeds are received.

I appreciate any answers that will clear this for me so I can pass on to my client.

Sandy