Claiming zero exemptions will calculate more taxes to be withheld from your pay then having 0 taxes withheld/taken out. Having an additional amount withheld is often easier to estimate at the end of the year than the amount that shows on the withholding charts.
You should visit your employer and ask them to help you look at the charts so you can figure out how much you need to have withheld and then set your withholding exemptions or amount to that.
Unfortunately, the withholding charts are constantly having changes made to them by our legislators for various reasons and do not remain constant
