what should my allowances be on w4
If you claim the perfect number of allowances, you'll owe no tax and end up with a refund of $0. Image: DonkeyHotey, Flickr. The W4 form is short and might seem like it should be easy to fill out, yet it still confuses many people. A key confounding issue is how many allowances to claim on the W4.mage: DonkeyHotey, Flickr The W4 form is short and might seem like it should be easy to fill out, yet it still confuses many people. A key confounding issue is how many allowances to claim on the W4. Let's take a look at the W4 form, at what allowances are, and at some strategies you might employ.