Starting a new business is exciting — but figuring out how to fund it can feel overwhelming fast. The right financing structure can help your business grow strategically and sustainably. The wrong one can create unnecessary financial pressure, ownership disputes, tax issues, or regulatory problems down the road.

Between equity rounds, convertible notes, SAFEs, and revenue-based financing, the terminology alone can make your head spin. This guide breaks down the most common funding options available to private startups, explains how they work in plain English, and highlights the legal and practical considerations founders should understand before raising money.

FINANCING CATEGORIES

At a high level, startup financing generally falls into three categories:

• Equity financing — selling ownership in the business
• Debt financing — borrowing money that must be repaid
• Hybrid financing — structures like SAFEs and convertible notes that may later convert into equity

The right structure depends on your business model, growth stage, cash flow, industry, and long-term goals.

MAIN FINANCING OPTIONS

The options below are geared toward private startups – companies raising capital from private investors, funds, or institutions rather than through a public stock exchange.

Bootstrapping

The simplest form of financing is funding your own business — using personal savings, reinvesting early revenue, or relying on cash from operations to grow. There’s no outside capital, no investors to answer to, and no ownership given up.

The obvious downside is that growth can be slow, and you’re personally absorbing all the financial risk. For businesses that can generate revenue early, bootstrapping is a powerful way to maintain full control. For those that need significant upfront capital before they can earn a dollar, it may not be enough on its own. Many successful companies begin with some level of bootstrapping before seeking outside capital later.

Equity Financing

Equity financing means selling a piece of your company in exchange for investment. Investors become part-owners — they share in the upside if the business succeeds, and they share in the loss if it doesn’t.

For private companies, equity is typically structured as membership interests (in an LLC) or shares of stock (in a corporation). Investors may receive common equity alongside founders, or a preferred class of equity that gives them certain priority rights — like getting paid back before common owners if the company is sold.

The appeal of equity financing is that there’s no repayment obligation. If the business struggles, you’re not on the hook for monthly payments. The trade-off is dilution — every investor you bring in owns a piece of what you’re building, and that ownership is permanent unless you buy them out.

Common sources of equity capital for private startups include friends and family, angel investors, venture capital firms, and strategic investors (larger companies that invest in exchange for a business relationship).

Debt Financing

Debt financing is borrowing money with a promise to pay it back, with interest, on a defined schedule. Unlike equity, you keep full ownership — but you take on a repayment obligation regardless of how the business performs.

For early-stage startups, traditional bank loans can be hard to access without an operating history, strong financials, or collateral. More accessible options often include:

• SBA loans — loans backed by the Small Business Administration, which can make lenders more willing to work with newer businesses.
• Lines of credit — flexible borrowing up to a set limit, useful for managing cash flow rather than funding a one-time expense.
• Venture debt — loans specifically designed for venture-backed startups, often structured alongside an equity raise. These typically come with warrants (a small equity component) in exchange for favorable terms.

Debt can be a smart tool when used carefully, but it adds financial pressure that equity does not. A bad revenue month doesn’t reduce your loan payment.

Convertible Notes

A convertible note is a short-term loan that is designed to convert into equity (ownership) — rather than be repaid in cash — when a triggering event occurs, usually the company’s next significant funding round.

Here’s how it works: an investor gives you money today, and both sides agree that the investment will convert into an ownership stake later, at a price tied to a future funding round. Investors are typically rewarded for taking early risk through a valuation cap (a ceiling on the conversion price, protecting them if the company’s value has grown significantly) and/or a discount rate (a percentage reduction off the price new investors pay at conversion).

Convertible notes are a loan on paper, which means they carry an interest rate and a maturity date. If a qualifying round hasn’t happened by the time the note matures, there can be complications — the investor can technically demand repayment, though in practice many deals are restructured rather than called.

SAFEs (Simple Agreements for Future Equity)

A SAFE is similar in concept to a convertible note — an investor puts money in now, and that investment converts to equity at a future round — but it is not a loan. There’s no interest rate, no maturity date, and no repayment obligation if conversion never happens.

SAFEs were created by Y Combinator (a well-known startup accelerator) to make early-stage fundraising faster and cheaper. They’re widely used in startup ecosystems because they’re short, standardized, and easy to close quickly. Like convertible notes, they typically include a valuation cap and/or discount rate.

The main thing to understand about SAFEs is that investors don’t own equity yet — they hold a right to receive equity in the future. That’s fine for sophisticated investors who understand the structure, but it’s worth making sure everyone involved understands what they’re signing.

One important nuance: both SAFEs and convertible notes were originally designed for corporations, not LLCs. They can be adapted for LLC structures, but doing so requires careful drafting to make sure the conversion mechanics work properly within your operating agreement. This is exactly the kind of thing where an attorney’s guidance is essential.

Revenue-Based Financing

Revenue-based financing (sometimes called RBF) is a newer model that sits between debt and equity. An investor or lender provides capital in exchange for a percentage of your ongoing revenue until a set repayment cap is reached — typically 1.5x to 3x the original amount.

There’s no fixed monthly payment. Repayments flex with your revenue — if you have a slow month, you pay less; a strong month, you pay more. And unlike equity financing, you don’t give up any ownership.

The catch is that it can be expensive relative to a traditional loan, and it requires a business that already generates consistent, predictable revenue. For that reason, RBF is generally better suited to operating businesses — SaaS companies, subscription businesses, and established service providers — rather than pre-revenue startups.

Other Financing Options

The options above are among the most common structures, but startups may also explore grants and non-dilutive funding, crowdfunding, strategic partnerships, or hybrid combinations depending on their industry and stage.

LEGAL SIGNIFICANCE

Choosing a financing structure isn’t just a financial decision — it’s a legal one. Every time you bring in an investor, issue equity, or sign a loan agreement, you’re creating rights and obligations that can affect your business for years. A few areas where the legal details matter most:

Securities Law Compliance. When you offer ownership interests or instruments like SAFEs and convertible notes to investors, you are generally offering securities under federal and state law. Private placements are subject to specific exemptions — most commonly Regulation D — that come with their own rules about who you can solicit, how you can advertise the offering, and what disclosures you must make. Getting this wrong can expose you and your investors to serious legal and financial consequences.

Operating Agreement/Shareholder Agreement. This is the governing document that defines investor rights, distribution priorities, voting rights, what happens if someone wants to exit, and how decisions get made. A poorly drafted agreement — or one that doesn’t anticipate future financing rounds — can create significant problems down the road.

Tax Implications. Different financing structures are treated very differently for tax purposes. The structure of your entity, how equity is issued, and how distributions are made can all affect what you and your investors owe. Early planning with both a tax advisor and an attorney can avoid costly surprises.

Investor Relations and Fiduciary Duties. Once you have investors, you have obligations to them. Understanding those obligations upfront — and structuring your deal documents to reflect them clearly — protects everyone.

BOTTOM LINE

There’s no universal right answer when it comes to startup financing. The best structure for your business depends on your stage, your industry, your goals, and who your investors are. What’s consistent across every option is that the details matter — and the details are where mistakes get made.

Working with an attorney who understands startup financing isn’t just about avoiding problems. It’s about building a foundation that supports growth, keeps you in compliance, and ensures that every investor relationship starts on clear, documented terms. The cost of getting it right upfront is almost always far less than the cost of untangling a poorly structured deal later.

This post is intended for general informational purposes only and does not constitute legal advice. Every business situation is unique. If you have questions about financing your startup, consult a qualified attorney.