Should I Claim 0 Or 1 on my W-4?

If you can be claimed by someone else such as a parent or spouse, you should use 0 on your W-4. If you cannot be claimed by another, it is your choice to use 0 or 1. Using 0 will mean more taxes would come out of each paycheck, but you have a better chance of a refund at the end of the year.