By and in large, if you have a u201cnormalu201d return (no unusual income or deductions), if you follow the formula laid out by the IRS on the W-4 you will out when you start with the employer, you will end up just about right.However, if you have unusual income or deductions, that may not be right, so you need to make a good estimate. This is how I make my estimates, note that Iu2019m not a tax professional, Iu2019m just a guy who hates writing a check in April.Determine your expected annual income. Take a typical paycheck and multiply the GROSS PAY (the top line number) by (one of: 52 (If you are paid weekly), 26 (biweekly), 24 (twice a month) or 12 (monthly)), this will give you your annual income. If you have more than one job, add up all of the sums. If you have irregular income, average a couple of months worth to make your best guess.If you are married, do the same drill for your spouse and add the numbers togetherSubtract from that the deductions everyone gets automatically $12,000 if you are single, $24000 if you are married filing jointlyCalculate the amount of tax that will be due on that amount:There are tax charts avaialble at 2022 Federal Income Tax Brackets and New Tax Rates - NerdWalletThatu2019s your tax DueMultiple the amount of tax withheld from your check for FEDERAL INCOME TAX ONLY (do not count Social security, state taxes, or any other dedutions) by the same number you used for incomeCompare the two numbers. Hopefully you will be close to zero. If you are likely to owe more than you want, bump your withholding up (file a new W-4, taking less deductions or having additional withheld from each check). If youu2019re getting too much backu2026my advice (which is not professional!) is to let that ride until the end of this year and verify the accuracy of your estimateu2026then and only then adjust if appropriate.