A seed round is an early-stage funding round to develop a product, validate demand, and build the ability to sell. What the startup commits to depends on the instrument and the contract: it can issue shares, grant rights to future shares, or take on convertible debt. The name of the stage doesn’t define those obligations.
To evaluate a seed round, the founding team needs to look at two things together: what changes in ownership and decision-making at the company, and what evidence it expects to produce before needing capital again. An attractive valuation explains only part of the deal.
General information; it does not replace legal or financial advice for your company.
Early-stage capital without a single defining amount
Cooley, a law firm that advises on venture capital deals, acknowledges that the use of the term “seed” varies and usually describes it as the first financing from regular startup investors. Carta, a provider of cap table management tools, uses a more institutional definition, though it also includes angels, friends and family, and accelerators among the possible sources.
There is no amount, company age, revenue level, or instrument that universally defines a seed round. Pre-seed, seed, and Series A are market conventions with overlapping boundaries, not mandatory steps. The useful distinction is what the business can demonstrate and what it expects to learn with the money.
What are you trying to prove with that money
Our editorial approach is to calculate the capital needed to reach evidence that allows a decision on the next step. In a SaaS business, a subscription software company, that might mean cohort retention and willingness to pay. In hardware it might mean the technical and economic viability of manufacturing. These are illustrative goals, not real cases or sufficient requirements for any investor.
The money finances that work, with the possibility that the results will force a change in a hypothesis. Reaching product-market fit, the match between product and demand, is not guaranteed. Raising a Series A isn’t the only outcome either: the plan might aim for sustainability or another form of financing.
Y Combinator’s fundraising guide, from the accelerator known as YC, links the amount raised to fundable milestones. It was published in 2016: we’re drawing on that principle and its arithmetic explanation, not its figures as 2026 benchmarks. Measuring those milestones also requires assigning responsibility for data and acquisition, a role we examined in our profile of the GTM engineer.
Equity, SAFE, and convertible notes: what’s exchanged
Cooley, Carta, and YC’s SAFE documents describe three common mechanisms. The table summarizes their general logic; the contract and jurisdiction determine the specific terms.
| Instrument | What the investor receives | What the founder should review |
|---|---|---|
| Equity at an agreed price | Shares issued at a price per share, often of a preferred class | Valuation, number of shares, and economic and governance rights |
| SAFE | A contract granting the right to receive shares upon defined events | Document version, conversion terms, cap table, and additional rights |
| Convertible note | A debt obligation that may convert under agreed terms | Interest, maturity, conversion trigger, and possibilities for demand or extension |
In YC’s standard model, a SAFE is not a loan: it carries no interest and has no maturity date. Nor are they current shares. It converts automatically in the equity financing contemplated by the contract and accounts for liquidity or dissolution events. The existence of a conversion mechanism doesn’t guarantee that a next round will happen.
The valuation cap sets a condition for calculating the conversion; it doesn’t certify how much the company is worth or guarantee a return. The discount, when it applies, is applied to the price per share under agreed terms. The two shouldn’t be mechanically added together: YC’s U.S. forms include differentiated versions, for example with a cap and no discount, or a discount with no cap.
A post-money SAFE with a cap allows you to estimate the stake sold under that model’s assumptions, before the capital from a future priced round. Later investments can dilute it. Dividing investment by cap isn’t a universal formula for pre-money SAFEs, ones with a discount, or ones without a cap.
Dilution: a hypothetical numerical example
All the figures that follow are a teaching example, not a real deal or a benchmark. We assume an equity round with no SAFEs, notes, or pending options, warrants, fees converted into shares, or secondary sale.
The company has 10,000,000 founder shares. It agrees to a pre-money valuation, before the new money, of $4 million and receives $1 million into the company. The math follows the arithmetic explained by YC, with our own illustrative figures.
| Hypothetical calculation | Result |
|---|---|
| $4,000,000 / 10,000,000 shares | $0.40 per share |
| $1,000,000 / $0.40 | 2,500,000 new shares |
| 10,000,000 + 2,500,000 | 12,500,000 shares after investment |
| $4 million + $1 million | $5 million post-money valuation |
| 2,500,000 / 12,500,000 | 20% for new investors |
| 10,000,000 / 12,500,000 | 80% for founders |
The founders keep the same number of shares, but they represent a smaller proportion. Dividing the million invested by the four million pre-money and calling the result the investor’s stake would be incorrect: in this example, the relevant denominator is the post-money figure.
Now suppose another round, also hypothetical, of $2 million at an $8 million pre-money valuation, with no other changes. The new investors buy 20%. The founders go from 80% to 64%, and the seed investors go from 20% to 16%. Dilution is cumulative; you don’t simply subtract twenty points from each group.
Options, pending instruments, and other issuances change the calculation. Moreover, the percentage alone doesn’t explain what a founder can approve or how much they would be paid out in a sale.
Rights the percentage doesn’t show
The model legal documents from the National Venture Capital Association, a U.S. venture capital trade association, separate out charters, stock purchase agreements, investor rights, and voting agreements. That structure shows why valuation alone isn’t enough to describe a deal.
Four conditions are worth distinguishing:
- Liquidation preference. This is the contractual priority one class of shares has over others in covered events, according to Cooley’s definition. Its effect depends on the multiple, participation rights, and other terms. Priority doesn’t guarantee recovering capital if funds fall short.
- Information rights. The agreement may define reports, recipients, and frequency. You also need to budget for the work of complying with them.
- Approvals and governance. Some decisions may require investor consent or an agreed board composition. A seed round doesn’t automatically mean a board seat, nor does a majority stake guarantee freedom to approve everything.
- Pro rata rights. Where they exist, these allow an investor to put in additional money to try to maintain their stake in the round covered by the right. In YC’s documents, this sits in an optional side letter. It doesn’t protect against all dilution for free, nor does it obligate the investor to follow on.
Before accepting terms, legal review of the document and the cap table model should surface these consequences. The pitch deck helps communicate the pitch, but the contract is what you need to review to understand the deal.
Runway and cash planning
Runway estimates how long the company can operate on its cash. Another entirely hypothetical example: $100,000 already on hand plus $1 million received, minus $50,000 in initial outlays, leaves $1,050,000. With a constant net burn of $50,000 a month, the static runway would be 21 months.
That timeframe isn’t a recommendation or a typical seed-stage duration. Hiring, sales, collection times, taxes, currency, and extraordinary expenses can all change it. Making decisions requires monthly projections and scenarios, as Carta also suggests, in addition to dividing cash on hand by last month’s burn, or cash consumption.
Separate committed money from signed money and from cash actually available. A verbal expression of interest doesn’t pay salaries; the cash plan needs to reflect when funds actually arrive and what disbursements they enable.
United States, Argentina, and Spain: what to adapt
What matters is the entity issuing the instrument and the structure of the offering. The residence of the founders or the country of their customers doesn’t by itself identify the issuer.
In the United States, YC publishes local SAFE templates along with versions specific to Canada, the Cayman Islands, and Singapore, with a recommendation to get advice licensed in the relevant jurisdiction. That doesn’t validate copying a U.S. form for an Argentine or Spanish company. The regulatory path also shapes how you can raise capital: the SEC, the U.S. securities regulator, explains that Rule 506(b) prohibits general solicitation, while Rule 506(c) allows advertising under certain conditions, which require accredited buyers and reasonable steps to verify that status. That’s not the same as publishing an offer with no restrictions.
In Argentina, Article 45 of Law 27,349 provides for irrevocable contributions toward a future share issuance for simplified stock corporations (SAS). Articles 46 and 47 cover share classes and rights. An irrevocable contribution isn’t automatically equivalent to YC’s SAFE. You need to check the regulations, the relevant registry, and tax and exchange-control status; the SAS rule doesn’t cover every type of corporate entity.
In Spain, ENISA, a public business financing body, offers participating loans under certain requirements and clarifies that it does not take part in ownership or management. That loan avoids dilution by its nature, but it still carries interest and obligations. It is not an equity round, nor is it guaranteed financing just because a company is at the seed stage. Contracts from other providers may have different terms.
Before closing a seed round, the ownership model needs to be readable alongside the cash plan. That combination lets you see what commitments you’re taking on and what room for decision-making remains if the business learns something different from what was expected.
Frequently asked questions
What is a seed round?
A seed round is early-stage funding to develop a product, validate demand, and build sales capacity. Cooley acknowledges that the term varies and usually links it to a startup’s first regular investors. There’s no universal amount or mandatory instrument. The stage needs to be understood alongside what the company expects to demonstrate and the terms of the capital.
Does a seed round always mean issuing shares right away?
A seed round can issue shares at an agreed price or use instruments that convert in the future. According to YC, its standard SAFE is a contract, not current shares or a loan, and converts into the equity financing contemplated by that document. A convertible note is debt with its own terms. The word “seed” alone doesn’t determine what the investor receives when they put in money.
How much equity do you give up in a seed round?
The stake given up in a seed round depends on the valuation, the instrument, and the cap table. In the hypothetical example in this article, $1 million in equity at a $4 million pre-money valuation produces a 20% stake for new investors, with no options or pending instruments. The math follows YC’s explanation; the figures are for teaching purposes and don’t represent an observed deal or a recommended percentage.
Do you have to pay back the money from a seed round?
Whether you have to pay back the money from a seed round depends on the instrument. Equity isn’t structured as a loan with a maturity date; a convertible note is debt under agreed terms. YC’s standard SAFE carries no interest and no maturity date, but it does account for liquidity and dissolution events. Review the contract before assuming what obligations exist.
What’s the difference between seed and pre-seed?
Seed and pre-seed are market conventions with overlapping boundaries, not stages defined by a universal amount or mandatory steps. Cooley acknowledges variation in how the term “seed” is used, and Carta brings together different sources and instruments of early-stage financing. The useful comparison looks at what the company can demonstrate, what it expects to learn, and what terms it accepts to fund that work.