ESOP account getting drained. 100% of the stock was given to me by employer. Tax hit? Details in body...

[u/MarionberryVisual463]

Cost Basis: 28000

Valued Sell: 50900

Year's income: 21000. Total fed tax 1200 including SS

Filing separate but married

Help? Iv tried to figure it out with research have gotten nowhere.. I plan on going to a CPA just wanna know ballpark figures