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Under MN law, accrued vacation is treated as a "wage
earned" and an employer must either allow the employee to take the paid time off or pay the employee for the cash value of those days. See Lee v. Fresenius Medical Care, Inc., 741 N.W.2d 117 (Minn. 2007) Furthermore, employers can only deduct from a salaried employee's pay if the employee misses a FULL work day due to illness or personal reasons.
Here, you clearly worked, both because you were fixing the credit card issue for the benefit of your employer and because you were in the offer reading and answering emails on your phone. Therefore, your employer would not typically be able to deduct from your salary. Since they must pay you for your salary, they cannot count this day as a vacation day and take away a day of your accrued vacation, as this essentially amounts to a "forfeiture" of your vacation since you were already entitled to be paid for the day. So, this would typically be a circumstance in which your employer's conduct is unlawful.
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