Per the IRS:
"A taxpayer's filing status typically depends on whether they are considered unmarried or married on December 31, which determines their filing status for that entire year. More than one filing status may apply in certain situations"
How a taxpayer’s filing status affects their tax return
Thus it will be wise to anticipate possible situations where you will end up owing taxes as in the case of changing filing status.
You can adjust your W-4 any time of the year including adjusting your filing status for valid reasons. Also since you are making adjustments in the middle of the year, it may be the case that you may have to increase your withholdings to avoid underpayment of taxes penalty.
Underpayment Penalty
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