What "Related" Actually Means Under the Statute
Section 6418 borrows its relatedness test directly from Sections 267(b) and 707(b)(1) of the tax code, provisions originally written for entirely different purposes, loss disallowance rules and partnership transactions, that now determine who can and can't participate in a credit transfer. These sections capture a wide range of relationships: entities under common control, corporations and their majority shareholders, and various family and ownership attribution rules that pull in connections a company might not think to check. A subsidiary and its parent are related. Two subsidiaries under common majority ownership are related to each other. A company and a shareholder holding more than the relevant ownership threshold are related.
Why This Matters More Than It Sounds Like It Should
For large corporate groups with both credit-generating operations and significant tax liability elsewhere in the organization, this restriction closes off what would otherwise be the simplest possible transaction. A utility holding company with a renewable development subsidiary and a separate, highly profitable operating subsidiary can't simply move credits internally to where the tax liability sits. The credit has to leave the corporate family entirely, transferred to a genuinely unrelated buyer, before it can be monetized under Section 6418.
How This Shapes Deal Structuring for Corporate Groups
This is part of why the deal mechanics we walked through in Inside a $50 Million Tax Credit Transaction: What Happens Between the NDA and the Closing Table matter even for large, well-capitalized corporate sponsors. A company that might assume it can handle credit monetization as an internal accounting exercise still has to run a full external transaction, with all the diligence, registration, and counterparty risk that involves, simply because the related-party restriction rules out the internal shortcut entirely.
Why This Is Becoming More Relevant as Data Center Financing Grows
This restriction is showing up more often as large corporate buyers build out power generation specifically to serve their own operations. As we discussed in Why Data Center Demand Is Pulling New Capital Into the Tax Credit Market, some of the largest new capital flows into this market are coming from companies financing generation to power their own facilities. If that generation entity and the offtaker sit inside the same corporate structure, which is increasingly common in vertically integrated data center power deals, the related-party rule can block a straightforward transfer between them, forcing a more complex structure or a genuinely external buyer instead.
What Corporate Groups Should Check Before Assuming a Transfer Works
The practical step is running the Section 267(b) and 707(b)(1) analysis early, before a deal structure gets built around an assumption that later turns out to be wrong. Ownership percentages, board overlap, and family attribution rules can create relatedness in ways that aren't obvious from an org chart alone, particularly in joint ventures or partially-owned subsidiaries where ownership sits just above or below a relevant threshold. Companies with complex corporate structures should treat this as a first diligence step, not a closing-stage technicality, since discovering a related-party problem late in a transaction usually means restructuring the deal from scratch rather than adjusting a term or two.