Does severance delay my unemployment claim? - first time posting

I was offered severance of 18 weeks after being let go as an accountant and I am unsure how it affects benefits. It has been weighing on me all week. The agreement mentions a release and a payment schedule. Who should I ask before signing?

Thanks for writing this out. I went through something close to it last year, and it settled down once I kept a simple log of every call and form.