The personal allowances worksheet is for your record only. Your employer will only get bottom part of the W-4 form. Its hard to say how much of a refund you will receive unless I have more information about your income and expenses. If you claim 1 on your W-4 and your refund is about 2 week paycheck, changing the W-4 to 0 you refund might be about 3 weeks
Enrolled Agent
10 years self employed , Income Tax Preparation & Representation