Before the Inflation Reduction Act, a developer that earned more clean-energy tax credit than it could use generally had one way to monetize it: a tax-equity partnership, in which an investor with tax appetite joined the project's ownership to absorb the credits and depreciation. Those structures are complex and expensive to assemble. Section 6418 created a simpler path — a direct sale. It lets an eligible taxpayer transfer eligible credits to an unrelated buyer for cash, turning a credit that would otherwise sit unused into immediate capital. Treasury and the IRS finalized the regulations implementing the election, effective July 1, 2024.

The final rule states the scope of what it governs:

This document contains final regulations concerning the election under the Inflation Reduction Act of 2022 to transfer certain tax credits. The regulations describe rules for the election to transfer eligible credits in a taxable year, including definitions and special rules applicable to partnerships and S corporations and regarding excessive credit transfer or recapture events. In addition, the regulations describe rules related to a required IRS pre-filing registration process.— Transfer of Certain Credits, final rule (Treasury/IRS), source

How a transfer works

The transferring party — the eligible taxpayer that earned the credit by owning the qualifying facility or property — elects to transfer all or a specified portion of an eligible credit to a transferee. The regulations refer to that portion as a specified credit portion. The transferee pays cash for it and then claims the transferred credit on its own return against its own tax liability, as if it had earned the credit itself, subject to the same rules and limitations. Critically, the consideration must be paid in cash, and the statute provides that the cash payment is not included in the transferring taxpayer's gross income and is not deductible by the transferee. The transfer is also a one-time, one-hop transaction: a credit that has been transferred generally cannot be transferred again by the buyer.

The eligible credits are the clean-energy credits the IRA designates as transferable — including the investment and production credits for clean electricity (Sections 48E and 45Y), the legacy Section 48 and 45 credits, and the Section 45X advanced manufacturing credit, among others. This is what lets a manufacturer's 45X credit or a solar project's investment credit be sold for cash to, for example, a profitable corporation in an unrelated industry looking to reduce its tax bill.

Transferability sits alongside a second monetization route the IRA created, elective payment — often called direct pay — and it is worth distinguishing the two. Elective payment lets certain entities, primarily tax-exempt and governmental organizations that have little or no tax liability, receive the value of an eligible credit as a payment from the government, as though they had overpaid their tax. Transferability, by contrast, is the route for taxable entities: a for-profit developer that cannot fully use a credit does not get a government payment; it sells the credit to another taxpayer that can use it. The two mechanisms broaden the universe of who can finance clean-energy projects in different directions — direct pay for entities outside the tax system, transfer for those inside it — and a given taxpayer generally uses one or the other for a given credit, not both.

Registration and the excessive-transfer penalty

Two guardrails define the regime. The first is mandatory pre-filing registration: before an eligible taxpayer can make a transfer election, it must register with the IRS through an online portal and receive a registration number for each eligible credit property, which it then includes on its return. The registration step exists to give the IRS visibility into what is being transferred before any credit changes hands.

The second is the excessive credit transfer rule. If a taxpayer transfers more credit than the project actually earned — an excessive credit transfer — the rule imposes a tax on the transferee equal to the excess plus an additional amount, a penalty that the regulations apply unless the transferee shows reasonable cause. Separately, if the underlying property is subject to a recapture event — for example, the property is disposed of within the recapture period — the regulations place the recapture consequences on the transferee that claimed the credit, with notice obligations on the transferor. These rules put the risk of an over-claim and of post-transfer recapture on defined parties, which is why transfer agreements in practice allocate that risk through indemnities and discounts.

The timing of these rules is part of what makes them workable. The transfer election is made on the transferring taxpayer's return for the year the credit is determined, after registration numbers have been obtained, and the regulations set out the transfer election statement that documents the deal between the parties. Because the consideration must be cash and is paid outside the income-tax system on both sides — not income to the seller, not deductible to the buyer — the economics of a transfer reduce to a discount: a buyer typically pays less than the face value of the credit, and the gap compensates it for the time value of money and for the risk that the credit is later reduced or recaptured. The regulations' allocation of excessive-transfer and recapture consequences to the transferee is exactly why those discounts and the accompanying indemnities exist.

The practical significance of Section 6418 is that it changed how clean-energy projects are financed.

A credit that previously required a tax-equity partnership to monetize can now be sold outright for cash to an unrelated buyer, broadening the pool of capital available to projects and manufacturers. When a clean-energy company's filings describe selling or transferring credits, Section 6418 is the mechanism, and the final rule is the document that defines who may transfer, what must be registered, and what happens if the transfer is excessive.