A down round does not change a founder's existing tax basis. Your per-share cost stays at the amount you paid, and the lower price only shrinks the sale-proceeds-minus-basis math on a future exit.
Tax basis means your cost for tax purposes. A down round means new shares sell below the prior round's per-share price. For example, stock bought for $1,000 keeps a $1,000 total basis even if the company later raises at half the prior valuation.
Table of Contents
- Why Your Old Basis Stays Put
- Does an 83(b) Election Change the Answer?
- What Happens to New Option Grants?
- Who Absorbs Anti-Dilution Adjustments?
- Does the Holding Clock Restart?
Why Your Old Basis Stays Put
The Internal Revenue Service explains that stock basis generally starts as the amount paid, and that basis is used to calculate gain or loss only on a later sale, exchange, or other disposition in how basis is figured. The tax event is the exit, not the market move in between.
That is why a price decline by itself leaves historic cost intact. The Internal Revenue Service treats the original cost as preserved in the basis rules, while lower proceeds reduce the eventual gain calculation. If you paid $0.001 per share, you still hold $0.001 basis after a down round.
Does an 83(b) Election Change the Answer?
An Internal Revenue Code Section 83(b) election moves taxation of restricted founder stock to the grant date. A founder who pays full fair market value at formation generally reports zero ordinary income then.
The down round does not reopen that grant-date calculation. Your election-year income stays as reported, and your basis still reflects what you paid plus any amount taxed at grant.
What Happens to New Option Grants?
A priced down round forces a new Section 409A common-stock valuation. Treasury Regulation 1.409A-1 treats recent arm's-length stock sales as material information the old report cannot ignore, according to Indinero in why the valuation must be refreshed.
That lower fair market value becomes the practical floor for new option strike prices. Future employee and founder top-up grants can then be priced lower without creating discounted deferred compensation.
- Confirm a new valuation is complete before issuing top-up grants
- Price new options at or above the new fair market value
- Keep grant dates, board consents, and valuation date aligned
Who Absorbs Anti-Dilution Adjustments?
A down round shifts percentage ownership from unprotected common and founders to protected preferred investors when anti-dilution terms apply. Founders own a smaller slice, but that dilution is separate from per-share tax basis.
The related tax issue falls mainly on preferred holders. An anti-dilution cut in conversion price that increases their proportionate interest can be a deemed stock distribution, even with no cash paid. That treatment affects investors, not founder common basis.
Does the Holding Clock Restart?
Your original shares keep their own holding period through a down round. New replacement shares start their own period instead.
The Internal Revenue Service provides that qualified small business stock gain exclusion requires holding for more than five years, with up to 100% exclusion for stock acquired after Sept. 27, 2010, as described in the exclusion holding rules. Track old and new lots separately so a later sale uses the right start date for each block.