506(b) vs 506(c): the one-way door

Rule 506 has two lanes, and the choice between them is one of the most consequential and least reversible decisions in a raise. The dividing line is simple to state: whether you are allowed to advertise the deal to the public. Everything else, who you can take money from and how hard you have to work to confirm they qualify, flows from that one difference.

Rule 506(b) is the quiet lane. You may not generally solicit or advertise. You can only raise from people with whom you have a substantive, pre-existing relationship, so no public posts, no cold outreach, no open pitch on a website. In exchange, the verification burden is light: you may accept an investor’s own representation that they are accredited and reasonably rely on it, absent something that tells you otherwise. And 506(b) lets in up to 35 non-accredited but genuinely sophisticated investors alongside unlimited accredited ones, though bringing non-accredited investors in triggers real information-delivery obligations. This is the traditional syndication lane, the known-investor raise done quietly.

Rule 506(c) is the loud lane. You may advertise freely, publicly, to strangers. In exchange, two things get stricter. Every single purchaser must be accredited, with no room for even one non-accredited investor. And you may not simply take their word for it; you must take “reasonable steps to verify” that each one is accredited.

Choosing 506(c) is a one-way door, and you must decide which side you are on before you say the first public word.

For years that verification requirement kept most sponsors out of 506(c). The methods were intrusive, reviewing tax returns and bank statements or paying for third-party letters, and many sponsors decided the megaphone was not worth the friction. A March 12, 2025 SEC no-action letter changed the math for high-minimum deals. Confirm it against the primary letter before relying on the specifics, but the substance is this: a sponsor can be deemed to have taken reasonable steps to verify if the investor commits at least $200,000 (for a natural person) or $1 million (for an entity), provides written representations that they are accredited and are not being financed by a third party to make the investment, and the sponsor has no actual knowledge to the contrary. For a deal with a six-figure minimum, that collapses much of the old verification cost and makes the loud lane genuinely usable.

Now the trap, and it is the reason the choice is a one-way door. The two lanes are not interchangeable fallbacks. Suppose a sponsor advertises the deal publicly, which is only permitted under 506(c), and then lets in an investor who turns out not to be accredited, or whom the sponsor never properly verified. The 506(c) exemption is now busted. The sponsor cannot retreat to 506(b), because 506(b) forbids the general solicitation that already happened. They cannot retreat to the bare Section 4(a)(2) private-offering exemption for the same reason. The public solicitation blew every private-offering exemption at once. A busted 506(c) after solicitation is not a downgrade to a lesser exemption; it is often no exemption at all.

Walk the consequence through a single bad investor. A sponsor raises $5 million under 506(c), advertised on a webinar, from twenty investors. Nineteen are properly verified. One wired $250,000 on a self-certification the sponsor never backed up, and it later turns out he was not accredited. The deal underperforms, and his lawyer notices the gap. The exemption may be invalid not just as to him but as to the whole offering, and an invalid exemption can expose the sponsor to rescission claims from all twenty investors, plus regulatory exposure. One unverified check can put the entire raise at risk.

The structuring consequence is to make the lane decision first, before any marketing exists, and then live inside it without exception. If you want to advertise, you are in 506(c), which means you verify every investor or you do not accept their money, full stop. If you want the lighter verification of 506(b), you must run a genuinely private raise from real relationships and keep every public word off the table. There is no drifting between them, and there is no fixing it after the fact.