Severance and unemployment, do they overlap? after 17 years as a project coordinator

I was offered severance of 17 weeks after being let go as a project coordinator and I am unsure how it affects benefits. Any experience at all would help. I have a mortgage and need to plan. How did your state treat it?

I filed on day one anyway and reported the severance honestly. The agency decided what to do about the timing.

Some states only count certain kinds of severance. A local workforce centre could tell me which.