Hello, thank you for your question. Please see below for our calculator to estimate your W4 witholding form. Try to fill out to the best of your knowledge and compare with what you currently have in your payroll systems. If they match, you can submit another W4 and elect extra withholding (Step 4 c on the actual W4 form) at a fixed amount per paycheck. Hope this helps!
https://turbotax.intuit.com/tax-tools/calculators/w4/
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