I'm not sure about your calculations since I can't see them. I would suggest you look at your form 1040 for 2023 and what your tax amount is on line 24. Subtract any credits on lines 27 - 31 that you think you will have in 2024 and that will tell you what your federal income tax was for 2023. If your income will be similar in 2024, then that is the amount of tax you will need to pay in during 2024. Look at the amount of tax withheld on your pay stubs and annualize that amount and compare it to your tax in 2023. If you are short, divide the shortage by the number of pays you have left in the year and that will tell you how much additional tax to have withheld each pay for the rest of the year. If your income will increase in 2024, multiply the increase by 24% and that should be a good estimate of how much you need to increase your 2023 tax before you do your calculations.
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