What Counts as an Excessive Credit Transfer
Under Section 6418(g)(2), an excessive credit transfer is the amount by which the credit a transferee actually claims exceeds the amount the transferor was legitimately entitled to determine in the first place. If a seller's underlying project only supported an 80% credit basis due to a documentation gap, but the buyer purchased and claimed the full 100%, that 20% gap is an excessive credit transfer, regardless of how the mistake happened.
Why the Penalty Lands on the Buyer, Not the Seller
This is the detail that catches people off guard. The transferee, not the transferor, owes the tax on the excess amount, plus a 20% penalty on top of it. Treasury's final regulations confirmed that any disallowed credit first reduces whatever portion the transferor kept for itself before it reduces amounts sold to transferees, but once the seller's retained portion is exhausted, the exposure flows directly to the buyer. A buyer who paid full price for a credit that turns out to be overstated doesn't just lose the value of the shortfall, they owe tax on it, with a penalty layered on top.
The Reasonable Cause Exception, and What It Actually Requires
The 20% penalty isn't automatic. A transferee can avoid it by demonstrating reasonable cause, and the regulations are specific about what that looks like: review of the transferor's underlying eligibility records, including documentation for any bonus credit amounts, reasonable reliance on third-party expert reports, and representations from the seller that the total amount transferred across all buyers didn't exceed the credit actually generated. This is exactly why the diligence process we walked through in Inside a $50 Million Tax Credit Transaction: What Happens Between the NDA and the Closing Table isn't optional formality. It's the buyer's primary defense if an excessive credit transfer is ever identified after closing.
Why This Risk Behaves Differently From Recapture
It's worth distinguishing this from recapture, which is a separate mechanism entirely. Recapture claws back a credit because something changed after the fact, a disposition, a change in use, an effective control event. An excessive credit transfer is different: the credit was never actually valid at the amount claimed, even at the moment of transfer. The compliance failures we described in What a Recapture Notice Actually Triggers unwind value after a valid credit existed. An excessive credit transfer means the value was overstated from day one, which is exactly the kind of exposure buyers are increasingly asking insurers to underwrite, a shift covered in The Insurance Policy Quietly Holding the FEOC Market Together.
What Buyers Should Actually Do With This
The practical defense isn't complicated, it's just often skipped under deal timeline pressure. Buyers need documented evidence of the seller's underlying eligibility calculation, not just a representation that the number is correct. That means reviewing the cost basis, the bonus credit qualifications, and the underlying engineering and tax support before closing, not after an audit letter arrives. A buyer who can show genuine reliance on solid documentation walks away from an excessive credit transfer with a tax bill. A buyer who can't show that walks away with a tax bill and a 20% penalty on top of it.