Regulation D Explained: How Startups Raise Capital Without an IPO

By Joe Wallin | Updated April 2026

Introduction: The Foundation of Startup Fundraising

If you're raising money for your startup, you're almost certainly using Regulation D (Reg D). Whether you're closing a small angel round or a multi-million-dollar Series A, Reg D exemptions enable the vast majority of private fundraising in America. Yet many founders and investors don't fully understand how it works or why it matters.

In this comprehensive guide, we'll walk through Regulation D from top to bottom. You'll learn why this 50-year-old regulation exists, how its different rules work, when to use each one, and how to avoid the mistakes that can jeopardize your exemption and your entire fundraising round.

The bottom line: understanding Reg D isn't just nice-to-know—it's essential for protecting your company and your investors.

The Registration Problem: Why Regulation D Exists

To understand Regulation D, you first need to understand the problem it solves.

The Securities Act of 1933 created the foundational rule of U.S. securities law: if you're offering or selling securities—and equity in a startup is definitely a security—you must either register that offering with the Securities and Exchange Commission (SEC) or qualify for an exemption.

What does registration involve? It's expensive, time-consuming, and impractical for startups:

• Preparing a detailed prospectus with audited financial statements
• SEC review and comment periods (typically months)
• Legal and accounting fees often exceeding $100,000
• Extensive ongoing compliance and reporting obligations
• Disclosure of competitive information and trade secrets

Registration makes sense for mature companies going public. It makes zero sense for a startup trying to raise $500K in an angel round.

Enter Regulation D. Adopted in 1982 and refined multiple times since, Reg D provides exemptions from registration for private offerings that meet specific requirements. These exemptions allow startups to raise capital privately without the burden of SEC registration—as long as they follow the rules.

Break the rules, and you lose the exemption. That's not a fine—it can mean your entire offering was illegal, your investors can demand their money back, and you face potential liability.

Rule 504: Small Offerings (Up to $10 Million)

Regulation D contains three main exemptions: Rules 504, 506(b), and 506(c). Let's start with Rule 504, which is the simplest but least commonly used.

The basics: Rule 504 exempts offerings of up to $10 million in securities in a 12-month period. You can sell to an unlimited number of investors with no restriction on their sophistication or wealth.

The catch: Rule 504 comes with significant restrictions:

• No general solicitation: You typically can't advertise or broadly solicit investors (though there's a limited exception for certain intrastate offerings)
• State blue sky compliance: You must comply with each state's securities laws, which can be burdensome
• Limited to small raises: Once you exceed $10 million in 12 months, Rule 504 is off the table

When founders use Rule 504: Occasionally, for very small seed rounds ($500K-$2M) where the company may not be ready to work with accredited investors or where the founder has significant relationships with non-accredited friends and family. Even then, Rule 506(b) is often the better choice because it has a federal preemption from blue sky laws (discussed below).

The bottom line: Rule 504 exists, but most startups skip it in favor of Rule 506 exemptions.

Rule 506(b): The Workhorse of Startup Fundraising

Rule 506(b) is the exemption that fuels most startup fundraising in America. If you've received a Series A, Series B, or even an angel round, you were probably raised under Rule 506(b).

The key features:

• Unlimited raise amount: You can raise $500K, $5M, $50M—there's no cap
• Mix of accredited and non-accredited investors: You can have up to 35 non-accredited investors, with unlimited accredited investors
• Extensive disclosure: If you have any non-accredited investors, you must provide them with detailed financial and business information
• No general solicitation: You can't advertise or broadly solicit
• Pre-existing relationship requirement: You must have a pre-existing substantive relationship with your investors (more on this below)
• Federal preemption: Your offering is largely exempt from state blue sky laws, though notice filing is still required in most states

Understanding the "accredited investor" requirement: The definition of "accredited investor" is crucial to Rule 506(b). An accredited investor is someone who meets one of several financial tests—most commonly, an individual with annual income over $200,000 (or $300,000 with a spouse) or a net worth over $1 million (excluding their primary residence). We'll dive deeper into accredited investor requirements below.

The accredited investor concept allows founders to raise unlimited capital as long as their investors are financially sophisticated. But it also creates a significant limitation: it's so difficult to take investment from non-accredited investors that many founders structure their rounds to be accredited-only, despite Rule 506(b) allowing up to 35 non-accredited investors.

When to use Rule 506(b): Almost every startup funding round. It's flexible, allows unlimited capital, works with your existing investor relationships, and doesn't require you to verify investor accreditation status (though you should still know your investors).

Rule 506(c): General Solicitation and Online Platforms

Rule 506(c) is the newcomer to the Reg D family. Created by the JOBS Act in 2012, it fundamentally changed startup fundraising by enabling general solicitation—but with a significant requirement.

The key features:

• General solicitation allowed: You CAN advertise your raise. You can use platforms like AngelList or SeedInvest. You can post on social media. You can hold webinars and pitch publicly
• Accredited investors only: Every investor in your offering must be verified accredited
• Verification requirement: You must take reasonable steps to verify accreditation status—you can't just take their word for it
• Unlimited raise: Like Rule 506(b), there's no cap on how much you can raise
• Federal preemption: State blue sky law compliance is largely preempted, though notice filing still applies

How Rule 506(c) is used: Increasingly, especially for seed and Series A rounds. Online platforms have made it practical to raise capital from accredited investors across the country. The trade-off: you must verify accreditation, which adds cost and complexity, but in return, you get the freedom to market your raise publicly.

The verification challenge: "Taking reasonable steps" to verify accreditation is vague. The SEC hasn't provided detailed guidance, so issuers and platforms use various methods: requesting tax returns, bank statements, financial statements, or relying on third-party verification services. Most platforms handle this automatically when investors sign up—they verify accreditation based on provided information.

Growing popularity: Rule 506(c) has enabled the rise of equity crowdfunding and online fundraising platforms. However, not all founders use it. Some prefer the simplicity of 506(b) with known investors, while others leverage 506(c) to tap broader investor networks.

Rule 506(b) vs. 506(c): Which One Should You Use?

The choice between 506(b) and 506(c) is one of the most important strategic decisions in your fundraising process. Here's how to think about it:

Practical decision framework:

• Use Rule 506(b) if: You have existing investor relationships you want to tap. You want to avoid the cost and complexity of verifying accreditation. You might want to include a few non-accredited friends and family. This is the default choice for most early-stage startups.
• Use Rule 506(c) if: You want to publicly market your raise (pitch deck on your website, AngelList campaign, etc.). You're raising on a platform like SeedInvest that handles verification. You want access to a broader pool of accredited investors across the country. You're comfortable with the added compliance burden.

The key insight: Rule 506(b) limits your marketing reach but is simpler. Rule 506(c) expands your reach but requires more work. Most successful startups start with 506(b) and may use 506(c) elements (like posting on platforms) as they mature and their investor base expands.

Important note: You can't use both 506(b) and 506(c) in the same offering. You have to pick one.

What Exactly Is an Accredited Investor?

The term "accredited investor" appears throughout Regulation D, and understanding the definition is essential to getting it right.

For individuals, accreditation is based on wealth or income:

• Income test: Annual income of $200,000 in the past two years and reasonably expected to reach $200,000 in the current year (or $300,000 if married). This is the most commonly used test.
• Net worth test: Net worth over $1 million, excluding the value of your primary residence. This was updated in 2020 to exclude the primary home (it used to include it).

Professional accreditation: Since 2020, the SEC has added several categories of people who are automatically accredited based on professional credentials or roles:

• Licensed securities professionals (Series 7, 65, 82, etc.)
• Officers, directors, and general partners of the company offering the securities
• Knowledgeable employees of private funds managing over $5 million in assets
• Family offices with over $5 million in assets

Important nuances: The income test looks at the past two years—you can't use projected future income. The net worth test excludes your primary residence, but includes investment real estate. If you're married and filing jointly, combined income counts. If you're single, only your income counts (even if you have a non-filing spouse).

Why this matters for your fundraising: Many founders assume all their investors are accredited based on a conversation, only to discover later that they don't technically meet the threshold. This is especially true for non-accredited investors in a 506(b) round—you need to track them carefully.

Form D: The Regulatory Filing You Can't Ignore

Once you start selling securities under Reg D, you must file a Form D with the SEC within 15 days of the first sale. This is a simple form that tells the SEC about your offering. It's not a pre-approval process—you don't need SEC approval before selling. You just report what you've done.

What goes in Form D?

• Basic info about your company
• The rule exemption you're using (504, 506(b), or 506(c))
• How much you're raising
• Information about your officers and directors
• Information about the offering (use of proceeds, etc.)

The critical mistake: Many startup founders and advisors think that failing to file Form D invalidates the exemption. This used to be true, but it's largely not anymore. Most courts have held that a failure to file Form D doesn't destroy your exemption—you still had an exemption under Reg D, you just failed to report it properly. However, failure to file can subject you to SEC enforcement action and fines.

The practical reality: Always file Form D. It's simple, it's required, and it avoids any argument that your offering was not properly exempted. The cost is minimal (it's just paperwork), and the compliance benefit is enormous.

Electronic filing: Form D is filed electronically on EDGAR (the SEC's system). Your attorney can usually handle this, or you can do it yourself—it's straightforward.

Amendments: If you initially filed Form D saying you'd raise $2M but end up raising $4M, you should amend your Form D. If there are material changes to the information you reported, update it.

State Blue Sky Laws: Federal Preemption Doesn't Mean No Compliance

Here's a point that trips up many founders: even though Rule 506 offerings are "federally preempted" from state securities laws, you still have state compliance obligations.

What is preemption? When an offering qualifies for Rule 506(b) or 506(c), federal law preempts most state securities registration and disclosure requirements. You don't have to register in every state where your investors live. That's a huge advantage over Rule 504.

But here's what preemption doesn't cover: Many states still require you to file a notice with the state—just not a detailed registration. This "notice filing" requirement exists in roughly two-thirds of states. It usually requires you to file the Form D and pay a filing fee (typically $200-$500 per state).

The "bad actor" disqualification: Even in preempted Rule 506 offerings, you must still comply with the SEC's "bad actor" disqualification rules. This means you can't raise under Rule 506 if you, your company, or certain insiders have been convicted of securities fraud or barred from securities industry participation. This is a federal requirement that applies even though state law is preempted.

Common pitfalls:

• Skipping notice filings: Some founders assume "federal preemption" means "no state compliance." Wrong. File notices in states where your investors live.
• Not tracking investor domicile: You need to know where your investors live to know which states require notice filings. Keep good records.
• Forgetting about state-specific rules: Even with federal preemption, some states have additional requirements (like Texas, which requires specific language in your offering documents).

The takeaway: Work with an attorney who understands both federal and state securities law. Federal preemption simplifies things compared to Rule 504, but it's not a free pass.

The Integration Doctrine: When Multiple Offerings Become One

Here's a subtle but critical concept: securities law treats separate offerings as one combined offering under certain circumstances. This is the "integration doctrine," and it can blow up your exemption if you're not careful.

What is integration? If you conduct multiple offerings and they're "integrated," they're treated as one offering for purposes of determining whether an exemption applies. This matters because limits—like the $10 million cap in Rule 504 or the 35 non-accredited investor limit in 506(b)—apply to the integrated offering, not to each offering separately.

Imagine you raise $6M under Rule 504, then a year later raise another $6M under Rule 504. You've exceeded $10M, so the offerings might be integrated and you might lose your exemption for both.

When are offerings integrated? The SEC uses a five-part test looking at:

• Whether the offerings are part of the same plan to raise capital
• The time interval between offerings
• Whether the same investors are involved in both
• Whether the same issuer is involved
• Similar terms and pricing

Safe harbors: There are safe harbors that prevent integration. The main ones:

• Six-month safe harbor: If offerings are more than six months apart, and there's no overlap in investors or similar circumstances, they're usually not integrated. If you close your seed round in January and your Series A in July, you're probably safe.
• Different securities: If you raise with notes in one round and equity in another, they're treated differently.

Why this matters: If you're close to a limit (e.g., you have 30 non-accredited investors in your 506(b) offering), don't assume you can easily do another 506(b) round six months later. Work with your attorney on integration analysis.

11 Common Reg D Mistakes (And How to Avoid Them)

Here are the mistakes I see most often in my practice, and how to avoid them:

1. General solicitation under Rule 506(b)
This is the big one. If you're using 506(b), you can't advertise, post on LinkedIn about the raise, have a pitch deck on your website, or solicit investors you don't have a pre-existing relationship with. The definition of "general solicitation" is broad. If you're using 506(b), keep the raise confidential and only pitch to known investors. If you want to market publicly, use 506(c).

2. Missing Form D filing
Don't skip Form D. It's required, it's simple, and it avoids arguments about whether your exemption was valid. File it within 15 days of your first sale.

3. Not verifying accreditation under 506(c)
If you're using 506(c), you must verify accreditation. You can't take investors' word for it. Request documentation or use a verification service. If you get audited and can't prove you verified, you lose the exemption.

4. Exceeding the non-accredited investor limit under 506(b)
You can have up to 35 non-accredited investors. If you have 36, you lose the exemption. Keep a careful count. This is easier than you might think to mess up, especially in follow-on rounds or with convertible notes where investor status might change.

5. Sloppy investor documentation
Keep records of who your investors are, their accreditation status (if relevant), what they invested, and when. Years later, if there's a question about your exemption, these records are critical. Use subscription agreements and investment spreadsheets to stay organized.

6. Forgetting state notice filings
Even with federal preemption, file Form D notices in states where your investors reside. The cost is low, the requirement is real, and failure to file can cause problems down the line.

7. Not understanding "pre-existing substantial relationship"
For Rule 506(b), you need a pre-existing substantial relationship with investors. A casual conversation at a networking event doesn't count. Having worked with someone, or having a friend refer them, does. Document these relationships.

8. Mixing Rule 506(b) and 506(c) in one offering
You have to pick one. You can't do a hybrid where some investors come in under 506(b) and others under 506(c) in the same round. Clarify your approach before you start fundraising.

9. Bad actor disqualification issues
Rule 506 requires that you and certain insiders haven't been convicted of securities fraud or related crimes, and haven't been barred from securities industry participation. If you have skeleton in your closet, address it before raising. Some disqualifications can be waived, but you need to be proactive.

10. Inadequate disclosure to non-accredited investors
If you have non-accredited investors under 506(b), you must provide them with the same kind of information you'd provide in a registered offering: financial statements, business description, risk factors, management information. Don't just hand them a pitch deck and a term sheet. Prepare an investor package with real disclosure documents.

11. Not considering integration risk
If you're planning multiple rounds in a short period, think about integration early. The integration doctrine can catch you off guard. Discuss timing and structure with your attorney.

Frequently Asked Questions About Regulation D

Q: Can I use Regulation D if I've already raised capital under another exemption?
A: Generally yes, but integration doctrine applies. If you raised under Regulation A (mini-IPO) and later want to raise under Reg D, the offerings could be integrated. Similarly, if you previously raised under Regulation CF (equity crowdfunding), consider integration issues. This is where integration analysis and safe harbor planning matter. Discuss with your attorney before mixing exemptions.

Q: What happens if I accidentally include a 36th non-accredited investor under Rule 506(b)?
A: Technically, you lose the exemption for the entire offering. That's the legal theory. However, courts have sometimes been lenient, especially if the extra investor's check was small or if you moved them to accredited status quickly. That said, don't rely on courts being lenient—keep your investor count disciplined. If you make a genuine mistake, consult an attorney immediately about whether a reformation or amendment is possible.

Q: If I use Rule 506(c) and file on AngelList, does AngelList verify accreditation?
A: Most platforms like AngelList have implemented verification procedures that the SEC considers reasonable. They typically ask for tax returns, financial statements, or other documentation. However, you (the issuer) are ultimately responsible for verifying that all your investors are accredited under Rule 506(c). You can rely on platform verification, but understand that you're the one taking the compliance risk.

Q: Do I need to register my securities with the state before filing Form D?
A: Not for Rule 506 offerings—that's what "federal preemption" means. However, you may need to file a notice with the state (not a full registration, just a notice that you conducted the offering). File Form D as your notice, along with the filing fee if required. Different states have different requirements—your attorney should handle this.

Q: Can I use Reg D to raise from international investors?
A: This gets complex. The securities laws technically apply to offers and sales of U.S. securities, even to non-U.S. investors. However, there are exemptions for "Regulation S" offerings to foreign investors. If you're raising from international investors, consult an attorney about whether Reg D or Reg S applies. Generally, you can include some international investors under Reg D if they're accredited and meet other requirements, but structuring an international raise requires careful analysis.

Q: What's the difference between a "securities offering" and raising money on convertible notes?
A: Convertible notes are debt instruments that convert to equity, usually upon a future priced funding round. They are still securities, and their offering must qualify for an exemption (Reg D being the most common). The structure is different from equity, but the exemption requirements still apply. Form D must still be filed, accreditation and non-accredited limits still apply if using 506(b), and general solicitation restrictions still apply. Don't assume that using notes instead of equity avoids securities law compliance.

Comparing Reg D to Other Exemptions

While this post focuses on Regulation D, it's worth noting that other exemptions exist and might be relevant to your situation:

• Regulation A (Mini-IPO): Allows offerings up to $75M with lighter registration requirements than a full IPO. Great for later-stage companies raising significant capital.
• Regulation Crowdfunding (Reg CF): Enables equity crowdfunding campaigns with broad investor access but complex compliance. Can accept non-accredited investors.
• Regulation S: Exempts offerings made outside the U.S. to foreign investors.
• Section 4(a)(2): The original private placement exemption—similar to Reg D but predates it. Less commonly used now, but sometimes relevant.

For most early-stage startups, Reg D is the right fit. As you grow, you might explore Reg A or Reg CF.

Recent SEC Proposals and Changes

The SEC is always tinkering with securities regulations. Recent proposed changes affect accredited investor definitions (expanding them to include certain professional credentials), and there have been discussions about SEC reopening private capital rules in 2026 and beyond. If you're raising capital, it's worth staying informed about regulatory changes that might affect your strategy.

Final Thoughts: Get It Right From the Start

Regulation D is complicated, but it's the framework within which nearly all private fundraising happens. Getting it right protects your company, your investors, and your exemption.

The most important takeaways:

• Pick the right rule: Rule 506(b) for traditional private raises with investor relationships; Rule 506(c) for public marketing with accredited investors; Rule 504 only for very small raises.
• Understand the limits: 506(b) has a 35 non-accredited investor limit and requires pre-existing relationships and no general solicitation. 506(c) requires accreditation verification. Both have unlimited raise amounts.
• Know your investors: Track accreditation status carefully. Document investor relationships. Keep good records.
• File Form D: Within 15 days of first sale. It's simple and removes any argument about exemption validity.
• Consider state compliance: File notices in relevant states, even though Rule 506 is federally preempted.
• Work with an attorney: Securities law is not something to DIY if you're raising significant capital. A good securities attorney costs far less than the cost of losing your exemption.

Regulation D has been the engine of private capital formation in America for 40+ years. Used correctly, it lets startups raise capital efficiently. Used incorrectly, it creates liability for you and your company. Invest the time and modest cost upfront to get it right.

About the Author: Joe Wallin is a startup and corporate attorney based in Seattle, and founder of TheStartupLawBlog.com. He advises startups on securities law, equity compensation, and other corporate matters. This post is for informational purposes and does not constitute legal advice.