Not sure if this is even do-able, but we just had to request a duplicate 1099 form for my dad's taxes. He is 92, Alzheimers/dementia/Parkinson's, and I am his POA. Trying to figure out if there is a legal way for me to access his account, since he is no longer capable of managing it himself. His monthly check currently goes into his checking account, which is fine; my main concern now is any forms I might need for things like taxes. Thanks in advance...
Your POA gives you the authority to access his checking and other accounts for the purpose of managing his money and paying his bills. Take a copy of the POA document with you to the bank for them to have.
As far as his taxes go, they are filled out on the same forms like anyone else's, signed by you as his POA and you may want to send a copy of the POA in with the return. If you don't want to do his taxes, then have a CPA do them.
You could call SS and see if they will just mail tax info again to your dads address if that is still valid.
Lastly, since you are POA, you might consider forwarding his mail to your address so that you can get a handle on his finances, bills, etc. you can do that and set a start and end date.