When both spouses work full time, it can be a recipe for under-withholding (filing jointly or married filing separately), if you aren't paying close attention (particularly to Step 2 of the Form W-4). It can get particularly tricky (and may require some calculation) if both spouses work and have different income levels. Here's a great article that explains significant changes to the W-4 that happened with the 2017 TCJA and how you can use the form to get to more accurate withholding.
The good news is that TurboTax gives you a calculator to help you get this right! Check it out and let us know if you still have questions.
One thing to keep in mind is that the changes you are making will only impact the rest of the year. If you have been under-withheld for much of the year and want to get caught up, you can always make an estimated tax payment. Here's the IRS page where you can do that.
Hope this helps.
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Regards,
Karen
TurboTax Expert
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