The estimated tax is based on your overall tax situation. In this situation you are dealing with lucrative capital gains tax rates. You can use the rate that applies to you below. First review the information about stock basis to allow you to determine your taxable gain.
Depending on your overall tax rate for your regular income, you will use 10% or 15% of the gain as an estimated payment assuming you do have taxable income without this income. The payment will be due on April 18, 2022 for the 2022 tax year.
There was a stock basis when your wife was granted the shares in her equity package. Try to locate the paperwork that came with them at the time. Next review the links below to determine which type the stocks were. Then the information will help you determine the cost basis for your wife.
Worse case scenario is that you have no cost basis or are unable to arrive at a cost basis - the full amount of your purchase price from the new company will be capital gain since you held the stock more than one year. This would not be the normal scenario. It's quite likely you will be able to determine the cost basis.
Best case scenario is that you arrive at a cost basis and only the difference between that and the purchase price will be taxable at capital gains tax rates.
Capital Gain Tax Rates
The tax rate on most net capital gain is no higher than 15% for most individuals. Some or all net capital gain may be taxed at 0% if your taxable income is less than or equal to $40,400 for single or $80,800 for married filing jointly or qualifying widow(er).
A capital gain rate of 15% applies if your taxable income is more than $40,400 but less than or equal to $445,850 for single; more than $80,800 but less than or equal to $501,600 for married filing jointly or qualifying widow(er); more than $54,100 but less than or equal to $473,750 for head of household or more than $40,400 but less than or equal to $250,800 for married filing separately.
However, a net capital gain tax rate of 20% applies to the extent that your taxable income exceeds the thresholds set for the 15% capital gain rate.
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