Why the Rule Exists in This Specific Form
Section 6418(e) makes the transfer election irrevocable and limits each eligible credit to a single transfer. Once a transferee taxpayer has purchased a credit, that credit's journey through the market is over. There's no secondary market mechanism built into the statute, no resale election, no path for a buyer to become a seller of the same credit down the line. This stands in contrast to how most financial instruments work, and it's a deliberate structural choice, not an oversight Treasury has left open for future guidance to soften.
What Doesn't Count as a Prohibited Second Transfer
The rule has a narrower scope than it might first appear. Allocating a purchased credit among partners within a transferee partnership isn't a second transfer, it's simply distributing a single purchased credit according to how the partnership's economics were structured. A partner in a transferee partnership who isn't subject to the passive activity rules can generally make full use of credits allocated that way. This distinction matters because it's exactly why credit-acquisition partnerships and funds have become a common structure in this market: they let multiple institutional investors share in a single purchased credit position without each one executing a separate transfer from the original seller.
Why This Shapes How Sophisticated Buyers Structure Positions
Because a credit can't be resold once purchased, buyers who might want flexibility to adjust their position later have to build that flexibility in before the transfer happens, not after. This is part of why the forward-purchase structures we described in Tax Credit Strips: The Forward-Purchase Structure Buyers Are Using to Lock In Multi-Year PTC Volume matter as much as they do. A buyer locking into a multi-year strip is making a series of one-way commitments, not a series of positions they can later trade out of if their tax situation changes.
How This Differs From the Basis Considerations in a Sale
The absence of a resale option is also a reason some buyers evaluate a straight Section 6418 transfer differently than a tax equity partnership interest, which can be structured with more flexibility around exit and reallocation over time. That's a separate consideration from the basis question we covered in Why Step-Up in Basis Disappears the Moment You Transfer a Credit Under Section 6418, but the two considerations often get evaluated together: a buyer weighing a transfer against a partnership structure is really asking both what tax attributes they'll receive and how much flexibility they'll retain afterward.
What This Means for How Buyers Should Approach Sizing
Since there's no way to unwind a position later, buyers need to size their purchase against their actual, realistic future tax liability at the time of the transfer, not a projection they hope holds up. Overbuying relative to usable tax liability doesn't create a problem that a later resale can fix, it creates carryforward exposure instead, which is its own separate planning question. Getting the sizing right at the outset isn't a nice-to-have in this market, it's the only real lever a buyer has, since the transfer itself is a one-way door.