Do you have to file a tax return in multiple states? You may hear that question every year from your accountant. Having a requirement to file tax returns in multiple states is becoming more and more prevalent. If you have employees who work in another state, have property in another state, ship to other states, or even if you perform work in your state for an out of state business you could potentially have a liability to register and file tax returns in that state depending on the laws of that state. That list is not all-inclusive!