Startup Legal & Finance Basics — Build a Startup

The handshake that cost $2 billion

In 2003, the Winklevoss twins hired Mark Zuckerberg to build a social networking site called HarvardConnection. There was no formal contract — just a verbal agreement and some emails.

Zuckerberg went on to build Facebook instead. The Winklevoss twins sued, claiming Zuckerberg stole their idea. The case dragged through courts for years. In 2008, they settled for $65 million in cash and Facebook stock. By Facebook's IPO in 2012, that stock was worth over $1 billion.

Whether Zuckerberg "stole" the idea is debatable. What's not debatable: if the Winklevoss twins had a proper contract — with clear IP assignment, deliverables, and timelines — the outcome would have been very different. A $500 legal agreement could have prevented years of litigation and hundreds of millions in settlements.

The boring stuff — incorporation, contracts, IP protection, accounting — isn't sexy. But it's the foundation that everything else sits on. Get it wrong, and no amount of great product or brilliant marketing can save you.

65MWinklevoss settlement ($)

500cost of a basic operating agreement ($)

50%of small businesses face legal issues in first 5 years

Choosing your business structure

The first legal decision: what type of entity to create. In the US, there are four main options (other countries have equivalents):

Structure	Best for	Tax treatment	Liability protection	Can raise VC?
Sole proprietorship	Freelancers, side hustles	Pass-through (personal taxes)	None — your personal assets are at risk	No
LLC	Small businesses, lifestyle businesses	Pass-through or elect S-Corp	Yes — separates business and personal	Possible but unusual
S-Corp	Profitable small businesses with payroll	Pass-through with payroll tax savings	Yes	No (ownership restrictions)
C-Corp (Delaware)	Venture-backed startups	Corporate tax (double taxation)	Yes	Yes — the standard

🔑If you're planning to raise VC, incorporate as a Delaware C-Corp

Almost every VC-funded startup in the US is a Delaware C-Corporation. Why Delaware? It has the most developed body of corporate law, the most predictable courts (the Court of Chancery specializes in business disputes), and every startup lawyer and investor is familiar with its rules. VCs won't invest in an LLC or sole proprietorship — the structures aren't compatible with how venture funding works (preferred stock, liquidation preferences, etc.).

There Are No Dumb Questions

"I'm not in the US. Does this apply to me?"

The principles are universal, but the structures differ. In the UK, you'd form a Ltd (private limited company). In the EU, each country has equivalents (GmbH in Germany, SAS in France). If you plan to raise US venture capital, many international founders incorporate a Delaware C-Corp as the parent company and operate through a local subsidiary. Consult a lawyer in your jurisdiction.

"Do I need to incorporate before I start building?"

Not necessarily. You can validate your idea as a sole proprietor. But incorporate before you: (1) take anyone's money, (2) sign contracts with customers, (3) hire anyone, or (4) build IP you want to protect. The cost is $500-$1,500 with a service like Stripe Atlas, Clerky, or a local lawyer.

LLC vs. C-Corp: the decision tree

Are you raising VC?

Delaware C-Corp

Is this a lifestyle business?

LLC (your state)

Planning to raise later?

Delaware C-Corp

LLC (your state)

The short version: If you ever want to raise venture capital, go with a Delaware C-Corp. For everything else, an LLC in your home state is simpler, cheaper, and more tax-efficient.

Intellectual property: what to protect and how

Your startup's IP is often its most valuable asset. Here are the four types of intellectual property protection:

Type	What it protects	How long	Cost	When to use
Trademark	Brand names, logos, slogans	Indefinite (if renewed)	$250-$1,000+ filing fee	When you have a brand name worth protecting
Patent	Inventions, processes, methods	20 years	$10,000-$30,000+	When you have a truly novel technical invention
Copyright	Creative works, code, content	Life + 70 years	Free (automatic)	Automatic for any original work you create
Trade secret	Proprietary processes, formulas, data	Indefinite (if kept secret)	Free (just keep it secret)	When secrecy is more practical than a patent

⚠️Patents are expensive and often unnecessary

First-time founders often think they need a patent immediately. In practice, most software startups don't file patents early (or ever). A patent costs $10K-$30K, takes 2-3 years to process, and is only valuable if you can afford to enforce it in court (which costs $500K+). For most startups, speed to market is better protection than a patent. The exception: if you have a genuinely novel technical invention that a large competitor could replicate easily.

What every startup MUST do for IP protection:

Assign all IP to the company. Every founder, employee, and contractor should sign an IP assignment agreement stating that everything they create for the company belongs to the company — not to them personally.

Use NDAs selectively. Non-disclosure agreements protect confidential information you share with contractors, potential partners, or employees. Don't ask investors to sign NDAs (they won't, and asking makes you look naive). Do ask contractors and partners.

Register your trademark. Once you've settled on a name and it has value, file a trademark with the USPTO ($250-$350 per class). This prevents others from using your name.

Document your trade secrets. If you have proprietary processes, algorithms, or data, document that they're secret and limit access. Courts won't protect "trade secrets" that you share openly.

⚡

IP Protection Strategy

50 XP

You've built a SaaS tool that uses a unique algorithm to match freelancers with projects. You have a brand name ("MatchWork"), a proprietary matching algorithm, and a growing database of freelancer profiles. What IP protection would you pursue, and in what order? 1. Brand name "MatchWork" → Protection type: ___ Priority: ___ 2. Matching algorithm → Protection type: ___ Priority: ___ 3. Freelancer database → Protection type: ___ Priority: ___ 4. Source code → Protection type: ___ Priority: ___ _Hint: Think about what's most at risk, what's cheapest to protect, and what's most valuable to the business._

Contracts every startup needs

You don't need a full-time lawyer on day one, but you need these documents:

Contract	What it does	When you need it
Co-founder agreement	Defines equity splits, roles, vesting, and what happens if someone leaves	Before writing a line of code
IP assignment	Transfers all work created by founders/employees/contractors to the company	Before anyone builds anything
Contractor agreement	Defines scope, payment, IP ownership, and confidentiality for freelancers	Before hiring any contractor
Employee offer letter + at-will agreement	Defines salary, equity, role, and terms of employment	Before first hire
Terms of service + privacy policy	Defines rules for users of your product	Before launching to the public
NDA (non-disclosure agreement)	Protects confidential information shared with third parties	Before sharing secrets with partners or contractors

There Are No Dumb Questions

"Can I use templates from the internet?"

For early-stage documents, yes — with caution. YC's open-source documents (SAFE, template documents at ycombinator.com/documents) are widely used and investor-friendly. Stripe Atlas provides templates for incorporation and basic agreements. Clerky offers automated legal documents. But for anything involving significant money or complex terms, get a lawyer to review.

"When do I actually need a lawyer?"

Get a startup lawyer when you: (1) raise your first round of funding, (2) give equity to anyone, (3) sign a contract worth more than $10K, or (4) receive a legal threat. Many startup lawyers offer deferred-fee arrangements for early-stage companies — they charge lower rates now in exchange for handling your future fundraising (where they make their real money).

Accounting basics: what founders must know

You don't need to be an accountant, but you need to understand four things:

1. Revenue vs. profit

Revenue is money coming in. Profit is what's left after expenses. A company with $1M in revenue and $1.2M in expenses has negative profit — it's losing $200K per year.

2. Burn rate and runway

✗ Without AI

✗How much money you spend per month
✗Example: $50K/month in expenses
✗Higher burn = faster cash depletion
✗Includes salaries, rent, tools, marketing

✓ With AI

✓How many months until you run out of money
✓Example: $300K in bank / $50K burn = 6 months
✓Start fundraising at 6 months of runway
✓Below 3 months = emergency mode

The formula: Runway (months) = Cash in bank / Monthly burn rate

If you have $500K and burn $40K/month, you have 12.5 months of runway. Start your next fundraise when you have 6 months left — fundraising takes 3-6 months.

3. Unit economics

Unit economics answer: "Do we make money on each customer?"

Metric	Formula	What it tells you
CAC (Customer Acquisition Cost)	Total marketing spend / New customers	How much it costs to get one customer
LTV (Lifetime Value)	Average revenue per customer x Average lifespan	How much one customer is worth over their lifetime
LTV:CAC ratio	LTV / CAC	Is the business viable? 3:1 or better is the benchmark

If it costs you $100 to acquire a customer (CAC) and that customer pays you $30/month for an average of 12 months (LTV = $360), your LTV:CAC ratio is 3.6:1 — healthy.

LTV per $100 CAC at different ratios. Below 1:1, you lose money on every customer.

4. Cash vs. accrual accounting

Method	When you record revenue	Best for
Cash basis	When money hits your bank account	Simple, early-stage startups
Accrual basis	When you earn the revenue (even if not yet paid)	Required for larger companies, GAAP compliance

Start with cash basis. Switch to accrual when your accountant tells you to (usually when revenue exceeds $1M or you raise a significant round).

⚡

Calculate Your Runway

25 XP

Your startup's financials: - Cash in bank: $240,000 - Monthly expenses: Salaries $25,000 + Tools $3,000 + Marketing $5,000 + Office $2,000 = $35,000/month - Monthly revenue: $8,000 Calculate: 1. Gross burn rate (total monthly expenses): ___ 2. Net burn rate (expenses minus revenue): ___ 3. Runway based on net burn: ___ 4. When should you start fundraising? ___ _Hint: Net burn = expenses - revenue. Runway = cash / net burn. Start fundraising at 6 months of runway remaining._

Tax considerations for startups

Taxes aren't exciting, but mistakes here can be costly. The key things to know:

For US C-Corps:

Corporate tax rate is 21% (federal) on profits
You don't pay corporate tax if you're not profitable (most early startups)
Founders pay personal income tax on any salary they take
83(b) election — File this within 30 days of receiving restricted stock. It tells the IRS to tax your shares at their current (low) value, not their future (hopefully higher) value. Missing this deadline can cost you hundreds of thousands in taxes. Your lawyer should handle this on day one

For LLCs:

Pass-through taxation — profits/losses flow to your personal tax return
Self-employment tax applies (15.3% on top of income tax)
Quarterly estimated tax payments are required

For everyone:

Keep business and personal finances completely separate — separate bank accounts, separate credit cards
Track every expense from day one — use QuickBooks, Xero, or even a spreadsheet
Hire a bookkeeper ($200-$500/month) when your monthly transactions exceed 50

⚠️The 83(b) election is the most expensive mistake founders make

If you're a US founder receiving restricted stock in a C-Corp, you have exactly 30 days to file an 83(b) election with the IRS. If you miss the deadline, you could owe taxes on the appreciated value of your stock when it vests — potentially hundreds of thousands of dollars on stock you can't sell. There is no extension. Set a calendar reminder the day you incorporate.

⚡

Entity Structure Quiz

25 XP

For each startup scenario, recommend the best entity structure: 1. Two founders building a VC-backed AI startup. Plan to raise $2M seed round. → ___ 2. A freelance designer starting a one-person consulting business. → ___ 3. Three friends opening a local coffee shop. No plans to raise outside funding. → ___ 4. A solo founder building a profitable SaaS tool. No plans for VC. Revenue: $15K/month. → ___ _Hint: Consider whether they need VC, how many owners there are, and tax implications._

There Are No Dumb Questions

"Do I need an accountant from day one?"

Not necessarily. Use QuickBooks or Xero and do basic bookkeeping yourself for the first 6-12 months. Hire a bookkeeper when you have more than ~50 transactions/month. Hire an accountant (CPA) for your first tax return and whenever you raise money or bring on employees. Budget $2,000-$5,000/year for accounting at the early stage.

"What about international taxes if I have customers in other countries?"

Digital products and SaaS are generally taxed where the company is incorporated, not where the customer is. But VAT/GST in the EU, UK, and Australia may apply to sales to individuals in those regions. Stripe Tax and services like Paddle handle this automatically. Don't ignore it — the penalties for failing to collect VAT can be severe.

Key takeaways

Incorporate early — before taking money, signing contracts, hiring anyone, or building IP. Delaware C-Corp for VC-backed startups; LLC for everything else
Protect your IP — IP assignment agreements are non-negotiable for all founders, employees, and contractors
Get the essential contracts — co-founder agreement, IP assignment, contractor agreements, and terms of service are must-haves before launch
Understand your numbers — burn rate, runway, CAC, LTV, and the LTV:CAC ratio are the metrics that determine survival
File your 83(b) election within 30 days if you're a US founder receiving restricted stock in a C-Corp
Separate business and personal finances from day one — future you will thank present you at tax time
Use templates from YC, Stripe Atlas, or Clerky for early documents — but get a lawyer for fundraising and significant contracts

Knowledge Check

1.Why do most VC-backed US startups incorporate as Delaware C-Corporations?

2.What is the 83(b) election, and why is it critical for founders?

3.A startup has $180,000 in the bank, $30,000/month in expenses, and $10,000/month in revenue. What is their runway?

4.Which contract is MOST important to have signed before building a product with a co-founder?

The handshake that cost $2 billion

In 2003, the Winklevoss twins hired Mark Zuckerberg to build a social networking site called HarvardConnection. There was no formal contract — just a verbal agreement and some emails.

65MWinklevoss settlement ($)

500cost of a basic operating agreement ($)

50%of small businesses face legal issues in first 5 years

Choosing your business structure

The first legal decision: what type of entity to create. In the US, there are four main options (other countries have equivalents):

Structure	Best for	Tax treatment	Liability protection	Can raise VC?
Sole proprietorship	Freelancers, side hustles	Pass-through (personal taxes)	None — your personal assets are at risk	No
LLC	Small businesses, lifestyle businesses	Pass-through or elect S-Corp	Yes — separates business and personal	Possible but unusual
S-Corp	Profitable small businesses with payroll	Pass-through with payroll tax savings	Yes	No (ownership restrictions)
C-Corp (Delaware)	Venture-backed startups	Corporate tax (double taxation)	Yes	Yes — the standard

🔑If you're planning to raise VC, incorporate as a Delaware C-Corp

There Are No Dumb Questions

"I'm not in the US. Does this apply to me?"

The principles are universal, but the structures differ. In the UK, you'd form a Ltd (private limited company). In the EU, each country has equivalents (GmbH in Germany, SAS in France). If you plan to raise US venture capital, many international founders incorporate a Delaware C-Corp as the parent company and operate through a local subsidiary. Consult a lawyer in your jurisdiction.

"Do I need to incorporate before I start building?"

Not necessarily. You can validate your idea as a sole proprietor. But incorporate before you: (1) take anyone's money, (2) sign contracts with customers, (3) hire anyone, or (4) build IP you want to protect. The cost is $500-$1,500 with a service like Stripe Atlas, Clerky, or a local lawyer.

LLC vs. C-Corp: the decision tree

Are you raising VC?

Delaware C-Corp

Is this a lifestyle business?

LLC (your state)

Planning to raise later?

Delaware C-Corp

LLC (your state)

The short version: If you ever want to raise venture capital, go with a Delaware C-Corp. For everything else, an LLC in your home state is simpler, cheaper, and more tax-efficient.

Intellectual property: what to protect and how

Your startup's IP is often its most valuable asset. Here are the four types of intellectual property protection:

Type	What it protects	How long	Cost	When to use
Trademark	Brand names, logos, slogans	Indefinite (if renewed)	$250-$1,000+ filing fee	When you have a brand name worth protecting
Patent	Inventions, processes, methods	20 years	$10,000-$30,000+	When you have a truly novel technical invention
Copyright	Creative works, code, content	Life + 70 years	Free (automatic)	Automatic for any original work you create
Trade secret	Proprietary processes, formulas, data	Indefinite (if kept secret)	Free (just keep it secret)	When secrecy is more practical than a patent

⚠️Patents are expensive and often unnecessary

What every startup MUST do for IP protection:

Register your trademark. Once you've settled on a name and it has value, file a trademark with the USPTO ($250-$350 per class). This prevents others from using your name.

Document your trade secrets. If you have proprietary processes, algorithms, or data, document that they're secret and limit access. Courts won't protect "trade secrets" that you share openly.

⚡

IP Protection Strategy

50 XP

Contracts every startup needs

You don't need a full-time lawyer on day one, but you need these documents:

Contract	What it does	When you need it
Co-founder agreement	Defines equity splits, roles, vesting, and what happens if someone leaves	Before writing a line of code
IP assignment	Transfers all work created by founders/employees/contractors to the company	Before anyone builds anything
Contractor agreement	Defines scope, payment, IP ownership, and confidentiality for freelancers	Before hiring any contractor
Employee offer letter + at-will agreement	Defines salary, equity, role, and terms of employment	Before first hire
Terms of service + privacy policy	Defines rules for users of your product	Before launching to the public
NDA (non-disclosure agreement)	Protects confidential information shared with third parties	Before sharing secrets with partners or contractors

There Are No Dumb Questions

"Can I use templates from the internet?"

For early-stage documents, yes — with caution. YC's open-source documents (SAFE, template documents at ycombinator.com/documents) are widely used and investor-friendly. Stripe Atlas provides templates for incorporation and basic agreements. Clerky offers automated legal documents. But for anything involving significant money or complex terms, get a lawyer to review.

"When do I actually need a lawyer?"

Get a startup lawyer when you: (1) raise your first round of funding, (2) give equity to anyone, (3) sign a contract worth more than $10K, or (4) receive a legal threat. Many startup lawyers offer deferred-fee arrangements for early-stage companies — they charge lower rates now in exchange for handling your future fundraising (where they make their real money).

Accounting basics: what founders must know

You don't need to be an accountant, but you need to understand four things:

1. Revenue vs. profit

Revenue is money coming in. Profit is what's left after expenses. A company with $1M in revenue and $1.2M in expenses has negative profit — it's losing $200K per year.

2. Burn rate and runway

✗ Without AI

✗How much money you spend per month
✗Example: $50K/month in expenses
✗Higher burn = faster cash depletion
✗Includes salaries, rent, tools, marketing

✓ With AI

✓How many months until you run out of money
✓Example: $300K in bank / $50K burn = 6 months
✓Start fundraising at 6 months of runway
✓Below 3 months = emergency mode

The formula: Runway (months) = Cash in bank / Monthly burn rate

If you have $500K and burn $40K/month, you have 12.5 months of runway. Start your next fundraise when you have 6 months left — fundraising takes 3-6 months.

3. Unit economics

Unit economics answer: "Do we make money on each customer?"

Metric	Formula	What it tells you
CAC (Customer Acquisition Cost)	Total marketing spend / New customers	How much it costs to get one customer
LTV (Lifetime Value)	Average revenue per customer x Average lifespan	How much one customer is worth over their lifetime
LTV:CAC ratio	LTV / CAC	Is the business viable? 3:1 or better is the benchmark

If it costs you $100 to acquire a customer (CAC) and that customer pays you $30/month for an average of 12 months (LTV = $360), your LTV:CAC ratio is 3.6:1 — healthy.

LTV per $100 CAC at different ratios. Below 1:1, you lose money on every customer.

4. Cash vs. accrual accounting

Method	When you record revenue	Best for
Cash basis	When money hits your bank account	Simple, early-stage startups
Accrual basis	When you earn the revenue (even if not yet paid)	Required for larger companies, GAAP compliance

Start with cash basis. Switch to accrual when your accountant tells you to (usually when revenue exceeds $1M or you raise a significant round).

⚡

Calculate Your Runway

25 XP

Tax considerations for startups

Taxes aren't exciting, but mistakes here can be costly. The key things to know:

For US C-Corps:

Corporate tax rate is 21% (federal) on profits
You don't pay corporate tax if you're not profitable (most early startups)
Founders pay personal income tax on any salary they take
83(b) election — File this within 30 days of receiving restricted stock. It tells the IRS to tax your shares at their current (low) value, not their future (hopefully higher) value. Missing this deadline can cost you hundreds of thousands in taxes. Your lawyer should handle this on day one

For LLCs:

Pass-through taxation — profits/losses flow to your personal tax return
Self-employment tax applies (15.3% on top of income tax)
Quarterly estimated tax payments are required

For everyone:

Keep business and personal finances completely separate — separate bank accounts, separate credit cards
Track every expense from day one — use QuickBooks, Xero, or even a spreadsheet
Hire a bookkeeper ($200-$500/month) when your monthly transactions exceed 50

⚠️The 83(b) election is the most expensive mistake founders make

⚡

Entity Structure Quiz

25 XP

There Are No Dumb Questions

"Do I need an accountant from day one?"

Not necessarily. Use QuickBooks or Xero and do basic bookkeeping yourself for the first 6-12 months. Hire a bookkeeper when you have more than ~50 transactions/month. Hire an accountant (CPA) for your first tax return and whenever you raise money or bring on employees. Budget $2,000-$5,000/year for accounting at the early stage.

"What about international taxes if I have customers in other countries?"

Digital products and SaaS are generally taxed where the company is incorporated, not where the customer is. But VAT/GST in the EU, UK, and Australia may apply to sales to individuals in those regions. Stripe Tax and services like Paddle handle this automatically. Don't ignore it — the penalties for failing to collect VAT can be severe.

Key takeaways

Incorporate early — before taking money, signing contracts, hiring anyone, or building IP. Delaware C-Corp for VC-backed startups; LLC for everything else
Protect your IP — IP assignment agreements are non-negotiable for all founders, employees, and contractors
Get the essential contracts — co-founder agreement, IP assignment, contractor agreements, and terms of service are must-haves before launch
Understand your numbers — burn rate, runway, CAC, LTV, and the LTV:CAC ratio are the metrics that determine survival
File your 83(b) election within 30 days if you're a US founder receiving restricted stock in a C-Corp
Separate business and personal finances from day one — future you will thank present you at tax time
Use templates from YC, Stripe Atlas, or Clerky for early documents — but get a lawyer for fundraising and significant contracts

Knowledge Check

1.Why do most VC-backed US startups incorporate as Delaware C-Corporations?

2.What is the 83(b) election, and why is it critical for founders?

3.A startup has $180,000 in the bank, $30,000/month in expenses, and $10,000/month in revenue. What is their runway?

4.Which contract is MOST important to have signed before building a product with a co-founder?