At my death can a bank pay out of trust a certain monthly amount to my handicap son

Good Morning: Based on the limited information provided, you can set up a special needs/supplemental needs trust that can pay out limited amounts from an account to your son.  However, you have to make the trust the owner of the account with the bank and name a trustee (not your son) who will control the funds and pay the money out in a way that you specify in the trust when you set it up.  Please bear in mind that you'll need to work with the bank directly to ensure they will allow the trust to own the account and the trustee access to it.  Every bank has its own forms & procedures for account ownership & access.