Assuming you both only have one job, each of you should give your W-4 form to your employer. The W-4 tells your employer how much to withhold, so there is no point giving your employer your spouse's W-4 form.
You estimate your incomes and 2025 deductions and credits. Then TurboTax fills out the W-4 forms based off that information. If your estimates are an accurate representation of your 2025 tax situation, your tax bill should be approximately zero.
If you have not filed your tax returns yet, you can prepare new W-4s in TurboTax as well. How do I update and print a new W-4?
More information on W-4s and withholding. Keep in mind, you can increase or decrease your withholding multiple times during the tax year if necessary.
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