Your filing status is determined as of December 31, 2021. If you are divorced by that date you file as single for the year. You cannot file a joint return if you are divorced by the year's end. If you think you are not having enough tax withheld from your paychecks now, then you have a few months left in 2021 to have more withheld by changing the W-4 you give to your employer.
https://ttlc.intuit.com/community/tax-topics/help/what-to-know-about-the-new-2020-irs-form-w-4-emplo...
https://www.irs.gov/pub/irs-pdf/fw4.pdf
https://www.irs.gov/individuals/tax-withholding-estimator
**Disclaimer: Every effort has been made to offer the most correct information possible. The poster disclaims any legal responsibility for the accuracy of the information that is contained in this post.**
