You won't get a big refund if that's what you are looking for. What will happen is, each week, you will be depositing $100 into the care account while your take-home pay only goes down by $65 or $70. That's where you will see the tax savings. If you also want a large refund, you can adjust your W-4 to have that extra $30 taken out of your check each week, which would then come back to you as a tax refund.
