Founders treat the cap table like paperwork — something the lawyer handles, something you glance at before a raise and forget about after. That's backwards. The cap table is the single most binding document in your company, and most of the damage it does happens quietly, years after the round closed.
The clause that bites later
Liquidation preferences are the classic example. A 1x non-participating preference sounds harmless in a term sheet — it just means investors get their money back first in a sale. But stack three rounds of 1x preferences on top of each other, add a modest acquisition offer, and founders can walk away with almost nothing even after building something real. Nobody explains this at signing, because at signing everyone is focused on the valuation number, not the waterfall.
Dilution compounds faster than it feels
A 20% raise doesn't feel like much in isolation. Do it three times and you've given up half the company before you've hired a VP of anything. Model your dilution across the NEXT two rounds, not just this one, before you sign. If you don't have a spreadsheet that shows your ownership after a hypothetical Series A and B, build one before your next conversation with an investor — it takes an hour and it will change what you negotiate for.
Read the pro rata rights, not just the price
Pro rata rights let early investors keep buying into future rounds to maintain their percentage. Reasonable in isolation. But if you've handed out broad pro rata to a dozen small checks, you can end up with a cap table so crowded that a lead investor for your next round won't touch it — there's no room left for them to take a meaningful stake. Keep pro rata rights for investors who actually add value beyond the check.
The habit that actually helps
Re-read your own cap table every six months, out loud, as if you were explaining it to a new hire. If you stumble explaining any clause, that's the one to get your lawyer to walk you through properly — not at your next raise, now.