Yes, settlement for wrongful termination is taxable income.
See Are legal settlements taxable?
https://ttlc.intuit.com/questions/2899059-are-legal-settlements-taxable
To report a lawsuit settlement in TurboTax:
i received two checks from a wrongful termination-one check was from back wages and taxes were taken out of that-the second one is 16,875 for non-economic damages including emotional distress. i do not work and live on social security earning only. I was told I would be sent a Form 1099 for the second check. What percentage of the $16,875 will i be taxed?
It is not taxed in a vacuum ... it is added to your other income so it can be taxed anywhere from zero % to 35%.
But only the amount over your Standard Deduction is taxed.
For 2021 the standard deduction amounts are:
Single 12,550 + 1,700 for 65 and over or blind (14,250)
HOH 18,800 + 1,700 for 65 and over or blind
Joint 25,100 + 1,350 for each 65 and over or blind
Married filing Separate 12,550 + 1,350 for 65 and over or blind