Tax, this is Casey. - Hi Casey, how are you? - I'm good, how about you? - I'm a little confused. I'm trying to fill out the tax return, and I do not know what a five-digit PIN number is. - That's one of my most frequently asked questions. It's just any five-digit number of your choosing, and I usually tell people to use their zip code because it's so easy to remember. - And do I have to use the same number every year or I don't change it up? - You can use a different five-digit number every year. It only applies to this tax return. - And when I'm looking for this PIN number on my return, where do I find it? - You'll find it on the actual paper return, on the signature line, right here. - And if I have any questions, this is the number I use for when I call the IRS, right? - Yes, when you need to talk to the IRS, they'll ask you what this number is, and that's how they know that you're you. - Well, thank you so much, Casey. - No problem. You can call me back anytime. I'm here from 9:00 to 5:00, and my phone number is 888-802-4299.