When in doubt, mark "single" regardless of marital status. Leave the rest of the form blank except for extra withholding if desired. (Tip: don't claim dependents on your W4 if you like a big tax refund). I have provided prefilled W4s to request the highest withholding amount when desired. Your marital status and what is used for withholding can be different.
W4 Forms (2025)
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