On line 4 of you Arkasas W4, you will enter the additional amount you want withheld.
Then you will take the $350 per month multiplied by 12 months for the yearly amount and then divide the yearly amount by the number of pay periods you have. It will be 26 if you get paid biweekly and 52 if you get paid weekly. Then enter this amount on line 4 of the W4.
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