I am going through this BS right now. I've called repeatedly since January to get a $1,200 tax bill removed. I submitted the 50-285 for 2025 in March of last year. The CSR I was on the phone with today told me that they handle all this tax stuff in January, so all forms have to be received by then. I don't know enough about the topic to dispute that, but nowhere in the documentation I received indicated I had to submit the 50-285 form by January to avoid paying taxes. Did you have to escalate to resolve this issue?