US workplace terms
83(b) election
A US tax filing, due within 30 days of receiving shares that will vest, choosing to be taxed on their value now rather than as they vest. It can save a lot of tax if the shares grow, and the deadline is strict.
A plain-English explanation of how this usually works in the US, not legal, tax or financial advice. Rules differ between states and change over time, so check your own situation. Disclaimer.
You'll hear it as
File your 83(b) election within 30 days, or it's too late.
Videos.
No video mentions 83(b) election by name yet. These are on the same topic, Careers & hiring.