Tax Credit Transfers: Unlocking $1T in Cleantech Investments

On June 14, 2023, the U.S. Department of the Treasury and the Internal Revenue Service released long-awaited proposed regulations governing the transferability of clean energy tax credits under the Inflation Reduction Act (IRA). The guidance, published in the Federal Register on June 21, 2023, clarified how eligible taxpayers can sell 11 different clean energy tax credits to unrelated parties in exchange for cash, creating an entirely new market for monetizing federal incentives tied to solar, energy efficiency, and other cleantech projects.

Before the IRA, most clean energy tax credits could only be used by the project owner or passed through complex tax equity partnerships that effectively locked out smaller developers and many homeowners' cooperative-style projects. Section 6418 of the Internal Revenue Code, enacted as part of the IRA, changed that by allowing credits such as the Investment Tax Credit (ITC), the Production Tax Credit (PTC), the residential clean energy credit's commercial counterparts, and credits for energy-efficient commercial buildings to be sold for cash. The June 2023 proposed rules spelled out the mechanics: one-time transfers, cash-only consideration, no resale of purchased credits, and a mandatory pre-filing registration process through an IRS electronic portal.

Industry analysts responded quickly. Major law firms including Kirkland & Ellis, Skadden, and Baker Tilly published guidance describing the rules as a transformative shift for project finance. Utility Dive reported that the guidance drew mixed reviews but was broadly welcomed as providing enough clarity for developers and tax credit buyers to start closing deals. Within months of the proposed regulations, an active secondary market emerged, with corporate buyers such as banks, insurers, and large manufacturers purchasing credits at a discount to face value to offset their federal tax liability.

For homeowners and small-scale solar developers, the transferability regime matters indirectly but meaningfully. Community solar projects, affordable housing retrofits, and multifamily energy efficiency upgrades that previously struggled to attract tax equity investors can now sell their credits directly, lowering financing costs and passing savings through to residents. State housing agencies and nonprofit developers have used the mechanism to stretch limited grant dollars further, pairing transferable credits with HUD, USDA, and state weatherization funding.

The Treasury and IRS followed up on April 25, 2024, with final regulations under Section 6418, largely preserving the framework from the 2023 proposal while clarifying registration requirements, excessive credit transfer penalties, and recapture rules. Together, the two rulemakings have underpinned what Treasury officials and clean energy trade groups have described as nearly $1 trillion in projected cleantech investment through the early 2030s, with transferability cited as one of the single most important levers for scaling solar, storage, and energy efficiency deployment nationwide.

Homeowners considering solar or major efficiency upgrades generally cannot sell their own residential credits — the Section 25D residential clean energy credit remains non-transferable — but they benefit from a deeper, more competitive market of installers and financiers whose project economics have been reshaped by these rules.