You may receive some UI benefits for a week if you work less than full time. You must continue to look for and be able to work. You must report your gross wages (wages before deductions) earned each week and not just take-home pay.  To report your earnings for the week, simply add the total hours you worked Sunday through Saturday for the week for which you are requesting payment and multiply your total hours worked by your hourly rate of pay.  For example, if you worked a total of 12 hours at a rate of $8.50 per hour, you would report $102 in earnings for the week (12 hours x $8.50/hour = $102).

The benefits paid when working less than full time will be reduced. To calculate your partial unemployment benefits, take your weekly wages and subtract $20 or 20 percent of your weekly benefit amount (WBA), whichever is greater. That amount is your deduction, which will be subtracted from your WBA and rounded down to an even dollar amount. See example below. Any withholding for federal taxes, etc., is taken from this amount. 

Check out the DES online partial benefit calculator.