Ok ... take a deep breath. What you put on the W-4 ONLY influences how the employer does the withholding. It does NOT need to match what is on your tax return at all. In fact prior to 2019 HOH was not even an option on the W-4 AND withholding at single will actually benefit you on the return.
That said you can hand in a new W-4 form to your employer anytime ...
Your W-4 form determines how much tax will be withheld from your pay. Use the Tax Withholding Estimator on the IRS web site to figure out what to put on your W-4 form. It will let you adjust your withholding to get the approximate refund amount that you want. Check it again in January. What you need for a full year at the new job might be different from what you need for the rest of this year.
Tax Withholding Estimator
