If you're raising money for your startup under Regulation D, you're choosing between two exemptions: Rule 506(b) and Rule 506(c). Together they power the overwhelming majority of private capital raises in the United States — from pre-seed rounds to late-stage growth financings. But they work very differently, and choosing the wrong one can create serious legal exposure.
The short version: 506(b) lets you raise from people you know without verifying their accreditation, but prohibits advertising. 506(c) lets you advertise publicly, but requires every investor to be a verified accredited investor. Both let you raise unlimited capital. Neither requires SEC registration.
What Is Regulation D?
Regulation D is a set of SEC rules that allow companies to raise capital from private investors without going through full SEC registration. Registration is expensive, slow, and designed for public offerings — it makes no sense for a startup raising its first $1 million from angels.
Reg D creates several exemptions from registration. The two you need to know are Rule 506(b) and Rule 506(c). There's also Rule 504 (limited to $10 million and rarely used by startups), but the 506 exemptions are the ones that matter.
Both 506(b) and 506(c) require you to file a Form D with the SEC within 15 days of your first sale. It's a short form — basic information about the company and offering. It's not onerous, but it's mandatory. Many founders miss this deadline. Don't.
Rule 506(b): The Traditional Path
506(b) is the exemption the venture capital industry was built on. It has been around since before the JOBS Act, and it remains the dominant choice for traditional VC rounds, angel rounds with warm introductions, and any raise where you know your investors.
What 506(b) allows:
- Raise from an unlimited number of accredited investors
- - Raise from up to 35 non-accredited "sophisticated" investors (with heavy disclosure obligations)
- - No SEC verification required — you can rely on investors' representations that they are accredited
- - No advertising or general solicitation of any kind
The catch: You cannot advertise the offering. No social media posts about your raise, no demo day pitches to a general audience, no press releases announcing you're fundraising. Every investor contact must be through a pre-existing, substantive relationship.
What counts as a pre-existing substantive relationship? The SEC has never drawn a bright line, but the test is whether the relationship existed before the offering and gave you enough basis to evaluate the investor's sophistication and financial situation. A prior business relationship, a personal friendship, a prior investment in your company, or a meaningful professional introduction all qualify. A cold LinkedIn message does not.
The non-accredited investor trap: Technically, 506(b) allows up to 35 non-accredited sophisticated investors. In practice, almost no startup takes this route. If you accept money from a non-accredited investor, you must provide audited financial statements and detailed disclosures comparable to a registered offering. That's expensive and slow. The practical answer is simple: don't take money from non-accredited investors under 506(b). Either find accredited investors, or structure a different kind of offering.
Rule 506(c): The JOBS Act Exemption
506(c) was created by the JOBS Act in 2012 and became effective in 2013. It was revolutionary because it did something the securities laws had never allowed: startups could openly advertise a fundraise to the general public.
What 506(c) allows:
- General solicitation — you can tweet about your raise, post on AngelList, pitch at a public demo day, hire a PR firm
- - Raise from an unlimited number of accredited investors
- - No dollar cap on the offering
The catch: Every single investor must be a verified accredited investor. Not just self-certified — actually verified through one of the SEC's approved methods. You cannot take money from non-accredited investors under any circumstances.
Verification methods under 506(c):
The SEC provides four safe harbor methods:
- Tax returns — Review the investor's last two years of tax returns to confirm income over $200,000 (individual) or $300,000 (joint)
- - Bank or brokerage statements — Recent statements showing net worth over $1 million (excluding primary residence)
- - Professional letter — A letter from a licensed attorney, CPA, or financial advisor confirming the investor meets the accredited investor standards
- - Third-party verification service — Platforms like Parallel Markets or Verify Investor that handle the documentation and confirmation process
Using a third-party service has become the standard for most 506(c) raises. It reduces friction, outsources compliance work, and is what investors expect when coming in through platforms like AngelList or Republic.
506(b) vs. 506(c): Head-to-Head
| Feature | Rule 506(b) | Rule 506(c) |
| — | — | — |
| General solicitation | Prohibited | Allowed |
| Advertising | Not permitted | Permitted |
| Accredited investors | Unlimited | Unlimited |
| Non-accredited investors | Up to 35 (with heavy disclosure) | Not allowed |
| Investor verification | Not required (reliance on reps) | Required (safe harbor methods) |
| Pre-existing relationship | Required | Not required |
| Speed to close | Faster | Slower |
| Cost | Lower | Higher (verification services) |
| Best for | Traditional VC, warm intros | Online platforms, public advertising |
| Form D filing | Required within 15 days | Required within 15 days |
When to Use 506(b)
Traditional venture capital rounds. If you're raising a seed or Series A from VC firms and angel investors you know through your network, 506(b) is the default. Most VC firms expect it. There's no reason to add verification friction when every investor is someone you or your lead already knows.
Warm intro angel rounds. Raising from angels through warm introductions — a friend connects you to a former founder, your advisor calls someone they know — is exactly what 506(b) was designed for. It's fast, relationship-driven, and how most early-stage rounds actually get done.
When you want to keep the raise quiet. Competitors, employees, and customers watch what founders do. If you don't want to broadcast that you're fundraising, 506(b) lets you raise capital with no public footprint. No announcement, no platform listing, no press release — just private conversations with investors you know.
When you need to close quickly. Verification takes time. When you're in the final stretch of a round and need to close fast, 506(b) is faster. The investor signs a representation letter saying they're accredited, and you're done. No waiting for tax returns or verification confirmations.
When to Use 506(c)
Online fundraising platforms. AngelList, Republic, Wefunder, and similar platforms operate under 506(c). If you're using one of these platforms, you're already in 506(c) territory. The platform handles verification on the backend.
Demo days and public pitches. Pitching at a demo day in front of a general audience is general solicitation. That means 506(b) is off the table — you need 506(c) for that round. This catches a lot of first-time founders off guard.
When you don't have a warm network. If you're a first-time founder without established investor relationships, 506(c) lets you reach investors you've never met. You can post publicly, run ads, or list on a platform. That audience is available under 506(c) in a way it isn't under 506(b).
When you want to leverage public momentum. Some consumer companies, climate tech startups, and mission-driven businesses benefit from the energy of a publicly announced raise. 506(c) is the only legal way to harness that.
The Mistakes That Get Founders into Trouble
Accidentally triggering general solicitation under 506(b). This is the most common violation. A founder posts about their raise on LinkedIn, announces it in a newsletter, or pitches at a public event — all while claiming a 506(b) exemption. Even a single public post can blow the exemption for the entire round. If you're doing 506(b), keep it completely private. No exceptions.
Not actually verifying under 506(c). Some founders claim 506(c) but just take investors' word that they're accredited without collecting any documentation. This defeats the entire purpose of the exemption and creates serious liability. If you're doing 506(c), you must actually collect and review the verification documents — or use a service that does it for you.
Mixing 506(b) and 506(c) without thinking about integration. The SEC can look at multiple offerings and treat them as a single integrated offering if they're too similar in timing, terms, and purpose. If your 506(b) round and a subsequent 506(c) raise overlap, the SEC could integrate them — meaning your 506(b) exemption is contaminated by the public advertising. If you want to do both, structure them as clearly separate offerings with different timing, different investor classes, and different terms. Talk to your lawyer before doing this.
Missing the Form D deadline. Both exemptions require you to file Form D with the SEC within 15 days of your first sale. Missing this deadline doesn't automatically void the exemption, but it's a violation that regulators take seriously and can complicate future fundraises. File it on time.
How This Interacts with SAFEs and Convertible Notes
The Reg D exemption you choose is separate from the instrument you use. You can raise on a SAFE, a convertible note, or priced equity — under either 506(b) or 506(c).
In practice: most SAFE raises from angels and seed investors use 506(b) — the relationships are warm and there's no need to advertise. Most SAFE raises on online platforms like AngelList use 506(c) — the platform requires it, and the investors are strangers who need to be verified. Most VC priced rounds use 506(b) — the investors are institutional and known.
For a deeper look at how to decide between a SAFE and a convertible note before you even get to the Reg D question, see our guide to convertible notes vs. SAFEs.
The QSBS Angle
One thing most Reg D guides skip entirely: the interaction between your offering structure and QSBS eligibility under Section 1202.
The Reg D exemption itself (506(b) vs. 506(c)) doesn't directly affect QSBS eligibility — what matters is the type of security and the timing of issuance. Stock issued in a priced round is most clearly QSBS-eligible. SAFEs and convertible notes can preserve QSBS eligibility if structured correctly, but the holding period generally starts at conversion, not at issuance of the instrument. Get this wrong and you could lose the Section 1202 exclusion — potentially costing millions at exit.
Frequently Asked Questions
Can I switch from 506(b) to 506(c) mid-raise?
Not really. Once you've accepted investors under 506(b), switching to 506(c) for the same offering is risky. You'd need to treat subsequent investors as part of a separate offering, which requires careful documentation and legal advice.
What happens if I violate the exemption?
Investors could have the right to rescind — to get their money back plus interest. The SEC can bring enforcement action. In serious cases, there are criminal penalties. The SEC regularly brings enforcement actions against startups that violated Reg D rules. This isn't theoretical.
Is there a cap on how much I can raise under Reg D?
No. You can raise unlimited amounts under both 506(b) and 506(c). The limits are on investor types and verification requirements, not on dollars raised.
Do I need a lawyer to do a Reg D offering?
You should. Reg D is technical, and the penalties for getting it wrong are serious. For a traditional VC round, you absolutely need a startup lawyer. If you're using a platform like AngelList or Republic, they often provide templates and handle some complexity — but the ultimate legal responsibility remains with you.
The Bottom Line
For most traditional startup fundraises — VC rounds, angel rounds with warm introductions, seed rounds from people you know — 506(b) is the right choice. It's faster, cheaper, and the market standard.
For raises on online platforms, public marketing campaigns, or outreach to investors you don't have a prior relationship with — 506(c) is the right choice. The verification friction is real, but it unlocks a much broader investor pool.
The most important thing is to pick one, understand its rules, and follow them consistently. The most common violations aren't strategic mistakes — they're founders who didn't realize they were triggering general solicitation, or didn't understand that 506(c) requires actual verification. Know the rules before you start.
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