Tax equity exists because renewable projects generate tax benefits, investment or production credits plus accelerated depreciation, that developers often cannot use themselves. Investors fund a large share of project costs in exchange for those benefits, and their diligence focuses on whether the benefits are real, correctly sized, and defensible on audit.
That makes tax equity diligence a documentation exercise above all: the credits are worth exactly what the paper trail can prove.
Credit qualification documentation
- Eligibility analysis for the credit claimed, with counsel support
- Beginning-of-construction documentation where start dates drive rates
- Prevailing wage and apprenticeship compliance records where applicable
- Domestic content and energy community documentation for adders claimed
- Placed-in-service evidence: substantial completion, PTO, commissioning
Basis and valuation
For investment-credit deals, the credit is a percentage of eligible basis, so diligence reconstructs basis line by line: cost segregation studies, appraisals supporting any step-up, and the eligible/ineligible allocation of every major cost category. Aggressive basis positions are the classic audit exposure, and investors price the risk accordingly.
Structure documents
- Partnership or lease structure agreements with flip mechanics
- Tax capital account and allocation modeling
- Fixed tax assumptions and indemnity provisions
- Insurance for tax risks, where used
- Intercreditor arrangements with any project debt
How transferability changed the market
Credit transferability created a simpler alternative to classic tax equity: projects can sell credits for cash under purchase agreements rather than forming partnership structures. The diligence burden did not disappear, it moved: credit buyers and their insurers review the same qualification and compliance file, typically with transfer-specific registration documents added.
Either way, the practical requirement is identical: a tax workstream in the data room, complete and audit-ready, with its own permission group for tax counsel and investors. Projects that maintain that file from construction onward close tax monetization months faster than those assembling it retroactively.
Next steps
FAQ
What does tax equity diligence focus on most?
Credit qualification evidence, eligible basis support, compliance records for any bonus adders, and placed-in-service documentation, all reviewed against the standard an IRS exam would apply.
How is credit transfer different from tax equity?
Transfer sells the credits for cash under a purchase agreement without a partnership structure; it is simpler but still requires the full qualification and compliance file, usually supported by insurance.
When should the tax documentation file start?
At the start of construction. Beginning-of-construction, wage, and content evidence must be captured contemporaneously; it is difficult or impossible to reconstruct later.