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How does 83b election work when paying fair market value at time of grant?
The tax cost at election should be zero.  The appreciation is all capital gain beyond your basis, which will be the value at election. IRC §83 applies to property received as compensation for services, where the property is still subject to a substantial risk of forfeiture.  It will catch unvested equity given to employees. §83(a) stops taxation until the substantial risk of forfeiture abates (i.e. no tax until stock vests) since the item is revocable and not yet truly income.  §83(b) allows the taxpayer to make a quick election (up to 30 days after transfer - firm deadline!) to waive the substantial risk of forfeiture (e.g. treat shares as vested today). The normal operation of §83 takes over after election and the taxable income is generally the value of the vested property minus the price paid for it.  If you paid fair market value today, then the difference is zero and your income from the shares is zero. The shares are now yours for tax purposes, though not for legal purposes.  That means they are most likely a capital asset in your hands, like other stocks you own or trade.  The shares will not be treated as compensation income on vesting, and vesting is not a tax matter for elected shares. If you sell them, you get capital gain (with tax dependent on your holding period) over a basis equal to FMV at the election.  The appreciation past election-FMV will be capital gain, rather than ordinary income.  This is why the §83(b) election is so valuable.  It does not matter at this point whether you bought the restricted shares at FMV or at discount (or received them free) - that only affects the taxes upon §83(b) election.