How to Build and Manage a Cap Table

Your cap table is a legal document that shows who owns what percentage of your company at any given moment. Get it wrong early and you'll spend tens of thousands in legal fees fixing it later — or worse, you'll discover at your Series A that your ownership structure makes you unfundable.

This guide walks you through building a cap table from scratch, managing it through each funding stage, and avoiding the mistakes that trip up most first-time founders.

What a Cap Table Actually Is

A cap table (short for capitalization table) is a spreadsheet or software record that tracks:

• Who owns shares in your company
• What type of shares they own (common, preferred, options, warrants)
• How many shares they own and at what price
• What percentage of the fully diluted company each holder represents

Fully diluted is the key phrase. It means the total ownership percentage assuming every option, warrant, SAFE, and convertible note has converted into equity. Always calculate ownership on a fully diluted basis when making decisions. Anything else is misleading.

Stage 1: Incorporation

When you incorporate a Delaware C-Corp (the standard for VC-backed startups), you authorize a pool of shares — typically 10,000,000 shares at a par value of $0.0001 per share.

You're not issuing all those shares immediately. You're just telling the state you could issue up to that number.

Right after incorporation, your cap table looks like this:

That's it. Two founders, ten million shares split evenly. Simple.

Choosing Your Authorized Share Count

10 million is standard. Go too low (say, 1 million) and you'll run out of shares to issue without doing a stock split. Go too high and you're paying more in state filing fees for no reason.

Stage 2: Founder Vesting

Here's the mistake founders make: they issue shares outright at incorporation without a vesting schedule. Then one co-founder leaves after six months — and walks away with 30% of the company for doing almost nothing.

Standard founder vesting: 4-year vest with a 1-year cliff.

This means:

• Nothing vests for the first 12 months (the cliff)
• After month 12, 25% vests all at once
• Then 1/48th of the total vests every month for the remaining 36 months
• After 48 months, you're fully vested

Shares are issued at incorporation, but subject to a repurchase right — the company can buy back unvested shares at cost if a founder leaves. This is functionally identical to vesting from the company's perspective.

If you're a solo founder, you still want vesting. It signals to investors that you're serious about the long game, and it protects you if you bring on co-founders later.

83(b) Election — File It Within 30 Days

When you receive restricted stock (shares with a repurchase right), file an 83(b) election with the IRS within 30 days of the grant. This lets you pay taxes on the low current value of the shares now, rather than on the much higher value when they vest.

Miss the 30-day window and you could owe taxes on hundreds of thousands of dollars of "income" as shares vest — even if you've never sold a share. Talk to a startup attorney within your first week.

Stage 3: Advisors

Advisors get equity, but far less than most people think they should get.

Standard advisor grants: 0.1% to 0.5%, also on a 2-year vest (sometimes with a 6-month cliff, sometimes none).

Use the FAST (Founder Advisor Standard Template) from the Founder Institute. It's free, widely accepted, and saves negotiation time.

The mistake founders make is being too generous too early. An advisor who takes a call once a quarter is worth 0.1%. Someone actively making introductions and attending monthly calls might justify 0.25%. No one justifies 2% unless they're the one customer who keeps the lights on.

After adding two advisors at 0.25% each, your cap table looks like:

Stage 4: The Option Pool

Before your seed round, you'll create an Employee Stock Option Pool (ESOP) — shares set aside to grant to future employees and contractors as options.

Standard option pool size: 10-15% of the fully diluted cap table post-round.

Why post-round? Because investors will insist the option pool be created before the money goes in. This is called the "option pool shuffle" — it dilutes founders before the investment, not after. It's a real negotiation point at seed stage.

If an investor says "we need a 20% option pool," push back. Ask what their hiring plan assumes. 10-12% is standard for a seed round. 20% is aggressive and primarily dilutes you, not them.

To create the pool, you either issue new authorized shares or reserve unissued ones. You'll need board approval.

Cap table after creating a 10% option pool:

Stage 5: SAFEs and Convertible Notes

Most seed rounds use either a SAFE (Simple Agreement for Future Equity) or a convertible note rather than issuing equity directly. These instruments convert into equity at your next priced round.

SAFE (Y Combinator's instrument): no interest, no maturity date, simpler docs. Standard terms include a valuation cap and sometimes a discount rate.

Convertible Note: debt that converts to equity. Has interest (typically 4-8%) and a maturity date (12-24 months). More paperwork, more complexity. Most modern seed deals use SAFEs.

How the Valuation Cap Works

Say you raise a $500K SAFE with a $5M cap. At your Series A, investors price the round at a $20M pre-money valuation. The SAFE holder converts as if the price was $5M, not $20M — so they get 4x more shares than a Series A investor paying the same amount.

SAFEs and notes don't appear as shares on your cap table until they convert. But you absolutely need to model their impact. If you raise $1M on a $5M cap and close a priced round at $10M pre-money, that $1M converts into roughly 20% of the company (before new investors). That's significant dilution you need to see coming.

Don't stack SAFEs carelessly. Founders who raise multiple rounds on SAFEs with different caps end up with brutal dilution at conversion. Model it every time you add a new instrument.

Stage 6: Priced Round Conversion

Your Series A is a priced round — investors pay a specific price per share, you issue new preferred shares, and all your SAFEs and notes convert.

The mechanics:

1. Agree on a pre-money valuation with lead investor (say, $12M)
2. Divide by total fully diluted shares to get the price per share
3. Convert SAFEs and notes based on their caps/discounts
4. Issue new preferred shares to Series A investors
5. The new option pool (if required) is also created here

Pre-Money vs Post-Money Formula

Post-money valuation = Pre-money valuation + new investment

If pre-money is $12M and you raise $3M, post-money is $15M. Your ownership percentage is calculated on the post-money, fully diluted basis.

Your ownership % = (your shares) / (total fully diluted shares post-round)

That denominator includes: existing common shares, option pool, converted SAFE shares, and new preferred shares. Get this wrong and you'll think you own more than you do.

Example: After a $3M Series A at $12M pre-money on a $15M post-money cap:

Cap Table Tools: Carta vs. Pulley vs. AngelList Equity

Spreadsheets work until they don't. Once you have more than 10 holders or your first convertible instrument, move to software.

Carta

The market leader. Used by over 40,000 companies. Pros: comprehensive, accepted by law firms and auditors, excellent for 409A valuations. Cons: expensive for early-stage companies ($3,000+/year), customer service can be slow.

Pulley

Built specifically for startups, founder-friendly pricing (free up to 25 stakeholders). Clean UI, faster to set up than Carta, excellent modeling tools. Gaining serious market share. Good choice for pre-Series A companies.

AngelList Equity

Free. Integrates with AngelList funding infrastructure. Great if you're raising on AngelList's rolling fund or SPV structures. Less comprehensive than Carta for complex cap tables.

Our recommendation: Use Pulley from incorporation through Series A. Switch to Carta if your Series A lead requires it (some do).

Common Cap Table Mistakes

1. Not having a vesting schedule on founder shares. If a co-founder leaves before the cliff, you want protection. Always vest.

2. Promising equity verbally. Verbal equity promises are either unenforceable or create legal headaches. Document everything in writing before anyone starts working.

3. Excessive advisor equity. Giving 1-2% to advisors who don't add real value creates dead equity that comes back to haunt you at every funding round.

4. Ignoring dilution from multiple SAFEs. Each SAFE you raise dilutes you at conversion. Model the impact before you sign.

5. Skipping the 83(b) election. The IRS does not care that you forgot. File within 30 days.

6. Using an LLC instead of a C-Corp. VCs cannot invest in LLCs cleanly. Convert to a Delaware C-Corp before you start fundraising. Doing it later costs more.

7. Not having a lead attorney. Clerky and Stripe Atlas are fine for basic incorporation. But by the time you're raising from VCs, you need a startup lawyer at a firm like Cooley, Gunderson, or Wilson Sonsini. The cost is real; so is the protection.

What to Do Next

1. Incorporate as a Delaware C-Corp if you haven't (Stripe Atlas is fine for this)
2. Issue founder shares with 4-year / 1-year cliff vesting
3. File your 83(b) elections within 30 days
4. Set up Pulley (free tier is sufficient until seed)
5. Before raising your first SAFE, run a model showing what conversion looks like at three different priced round valuations
6. Before creating an option pool, calculate exactly what hiring you need to cover with it

Keep your cap table clean. Investors read it like a résumé. Messy ownership structure signals messy decision-making.