Do you mean 403(b)? Or 401(a)?
If you can certify that the withdrawal was due to a COVID-19-related hardship, there are several special provisions that apply (for withdrawals up to $100,000 per person).
- you are exempt from the extra 10% penalty for early withdrawal if you are under age 59-1/2
- you can spread the tax out over 3 years
- you can return the money to the account within 3 years so it can continue to grow for your retirement.
We can't tell you how much tax to have withheld, it depends on your other income, deductions and credits. The income tax rates for most taxpayers are 15%, 22% or 24%. If you wanted to spread the tax out over 3 years, you could have less withheld this year, but you would have to come up with the rest next year unless you return part of the distribution to the account instead.
See here
https://www.irs.gov/newsroom/irs-provides-guidance-under-the-cares-act-to-taxpayers-with-net-operati...
You can also use the IRS calculator to estimate the tax you will owe.
https://www.irs.gov/individuals/tax-withholding-estimator
If the withdrawal is NOT related to a COVID-19 hardship, then you will be subject to regular income tax, plus a 10% penalty for early withdrawal if you are under age 59-1/2. (There may be an exception to the penalty for certain types of retirement accounts if you retire due to permanent disability.) Taxes would be 15%, 22% or 24% for most taxpayers. However, if you are retired and collecting social security, this additional income could also cause more of your social security to be taxed. You can't spread out the taxes on a regular retirement withdrawal.
