Hey - we in tilted finance try to answer quick
Er... do you mean have less taxes taken out of your check? You should be able to adjust the number of dependants (amount of taxes) anytime throughout the year. I'd contact your Human Resources Person/Department and get the appropriate paperwork...
I'm not a lawyer, but I believe it is legal to put false information for the number of dependants so that you can adjust the amount accordingly, but you certainly have to be accurate when you are filing for the IRS. For example, if you want more taxes taken out, you can put 0 for dependants, if you want very little taxes taken out, you can put 5...