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Early Exercise and 83(b) Election
I assume I can/will need to file an 83(b) election, in order to avoid   tax repercussions? What exactly will this save me from? 83(b) election is for restricted stock grants, not for stock purchases. For restricted stocks, you generally pay income tax when they vest. For startups the price difference between the time of the grant and the time of the vesting can be astronomical and by choosing 83(b) you effectively pay income tax on the value of the grant instead of the value of the vest. Then, you only pay capital gains tax on the difference between the sale price and the grant value when you sell. In your case you're exercising an option, i.e.: you're buying a stock, so 83(b) is irrelevant. What you will pay though is the tax on the difference between the strike price and the stock FMV (unless the stocks you end up buying are restricted - which would have been the case if you exercised your options early, but I don't think is going to be the case now). What steps should I take to (in the eyes of the law) guarantee that   the board has received my execution notice? The secretary of the board   is a notorious procrastinator and can be very unorganized. You should read what the grant contract/company policy says on that. Ask the HR/manager. Usually, a certified letter with return receipt should be enough, but you should verify the format, the address, and the timeframe.