Compare the amount of your federal withholdings to last year if you can so you have a starting point. You can use 'Extra withholding', Line 4(c) to add more federal withholding each pay period. If you take the result from the IRS calculator, then subtract the difference for the actual refund you received this year, then divide that by the remaining pay periods for 2025, then put that figure on your W-4, Line 4(c).
You are allowed to change your W-4 as many times as you need to during the year and your employer must make the changes requested.
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