@aherasimovich wrote:
Can you please point to official IRS document which says that is 60 days? I tried to do in company where I work but they told me it is 30 days, but I missed by 5 days 🙂
Yes, I'm sorry, it is 30 days. I may have been thinking of a different tax provision. Under Treasury Regulation 1.125.4, you have 30 days after a "change of status" event to change your benefit election. If you miss that window, you have to wait for the next open enrollment period.
https://www.law.cornell.edu/cfr/text/26/1.125-4
