What is tax equity financing?

Tax equity financing is a specialized project-finance structure in which an investor provides capital to a project, most commonly in renewable energy or other tax-credit-eligible developments, in exchange for the project’s federal tax benefits, rather than relying primarily on operating cash flow.

It is used when the project developer cannot efficiently use federal tax credits or accelerated depreciation because of insufficient taxable income. A tax equity investor (typically a large bank, insurance company, or corporation) monetizes those tax benefits by applying them against its own U.S. federal tax liability.

How Tax Equity Financing Works

1. A qualifying project is developed
   Common projects include:
   
   • Solar energy
   • Wind energy
   • Energy storage
   • Low-income housing developments
2. The project generates federal tax benefits, such as:
   
   • Investment Tax Credit (ITC)
   • Production Tax Credit (PTC)
   • Accelerated depreciation under MACRS
   • Low-Income Housing Tax Credit (LIHTC)
3. A tax equity investor contributes capital
   In exchange, the investor typically receives:
   
   • The majority of federal tax credits
   • Most depreciation deductions
   • A limited portion of project cash flow
4. The transaction is structured through a partnership or lease
   Most tax equity deals rely on partnership allocations under IRC §704(b) or leasing arrangements permitted by IRS guidance.

Common Tax Equity Financing Structures

1. Partnership Flip (Most Common)

• Tax equity investor receives most tax benefits initially
• After achieving a target return, allocations “flip” back to the developer

2. Sale-Leaseback

• Project is sold to the investor and leased back
• Investor claims ITC and depreciation

3. Inverted Lease (Lease Pass-Through)

• ITC is passed to the tax equity investor
• Developer retains depreciation

Why Tax Equity Financing Exists

Tax equity financing exists because:

• Many federal tax credits are non-refundable
• Credits often cannot be carried back
• Carryforwards may take years to utilize

Tax equity allows developers to convert tax benefits into upfront capital, while investors obtain predictable after-tax returns.

2026 Updates:

The Biggest Change: Transferability (The "T-Flip")

Starting in late 2024 and becoming standard practice in 2026, the IRS allows project developers to sell tax credits directly for cash to any third party (under Section 6418).

• The Hybrid "T-Flip": Many 2026 deals now use a hybrid structure. A tax equity investor still provides capital to monetize depreciation (which cannot be sold directly), but the partnership then sells the tax credits to a third-party buyer to maximize the total cash influx for the project.

OBBBA Impacts for 2026

The OBBBA introduced several "cliffs" and new requirements that tax equity investors are watching closely this year:

• The "Begin Construction" Deadline: For wind and solar projects to qualify for the full 45Y/48E credits, they must generally begin construction by July 4, 2026. Projects starting after this date must be "placed in service" by the end of 2027, or they face steep credit phase-outs.
• Domestic Content (The 55% Rule): For projects starting construction in 2026, the required threshold for "domestic content" (U.S.-made parts) has increased to 40% for most projects, on its way to 55% in later years. Investors now require strict "supply chain audits" before they will sign a deal.
• Foreign Entity Restrictions (FEOC): As of January 1, 2026, any project involving "prohibited foreign entities" (specific restricted countries) is generally disqualified from claiming these credits. This has added a heavy layer of legal due diligence to every tax equity closing.

Sources:

IRC §48 - Energy credit

IRC §45 - Production Tax Credit

IRC §704(b) - Partner’s distributive share

IRS Revenue Procedure 2007-65

IRS Publication 946 - How To Depreciate Property

IRS Publication 925 - Passive Activity and At-Risk Rules