2021 Tennessee Code
Chapter 4 - Elective Share of Surviving Spouse
§ 31-4-101. Right to Elective Share

If the decedent and the surviving spouse  were married to each other:  The elective-share   percentage is:
less than 3 years 10% of the net estate
3 years but less than 6 years 20% of the net estate
6 years but less than 9 years 30% of the net estate
9 years or more 40% of the net estate