Have client who bought another home while she was waiting to sell the home she lived in since 1976 with her husband.

She bought a smaller home and has only lived in the new home for less than a year.

The other home was up for sale and finally sold for in March 2020 for 420k.

Husband passed away in 1999.

They bought the home back in 1976 for $46,000.

Improvements over time were approx. $100k (New Floors, New roof, new siding, new windows)

There is no tax on the 420k, correct?

Thank you,
Douglas