One of the most important things you can do is open an IRS Account. You actually already have one, you just need to establish online access to it. With all the cuts to IRS staffing, I highly recommend this. Most tax problems with the IRS can be solved if you have access to your account, especially if you’re using my services to help you.
Just go to irs.gov/your-account and follow the instructions. You’ll need a smartphone, an e-mail account you can check on your phone, and your driver’s license. It can be a bit of a challenge, but once it’s done, it’s done, and then don’t ever lose your login e-mail or password. Good luck.