Investment Tax Credit Qualified Costs: What Buyers Need to Know During Due Diligence
When a tax credit buyer sits down to evaluate a transfer deal, the first number they interrogate isn’t the credit amount, it’s the basis behind it. The investment tax credit is calculated as a percentage of eligible costs, and if the seller’s basis is wrong, the credit is wrong. That makes diligence on qualified costs the single most consequential step in any transfer transaction, and it’s where deals either hold up or fall apart.
Why the Basis Number Deserves This Much Scrutiny
The math sounds simple. Under Section 48, the investment tax credit equals a percentage of the depreciable basis of eligible energy property placed in service during the tax year. For most projects meeting prevailing wage and apprenticeship requirements, that rate is 30%. Miss those PWA requirements, and it drops to 6% a difference that can wipe out the entire economic rationale for a deal.
But the real complexity isn’t in the percentage. It’s in what actually belongs in the basis. Not every dollar a developer spends building a solar farm or a battery storage facility qualifies. Buyers who don’t pressure-test that number are essentially trusting the seller’s accounting without verification and in a market where tax credit insurance underwriters increasingly demand independent ITC studies before issuing coverage, that’s not a position any sophisticated buyer wants to be in.
What Costs Generally Qualify
The core of any investment tax credit basis is the tangible energy property itself. For a solar project, that means modules, inverters, racking systems, and wiring. For energy storage, the battery cells, power conditioning equipment, and thermal management systems. The equipment that directly generates, stores, or converts energy is the most straightforward category and usually the largest share of the basis.
Where it gets more nuanced is the soft cost layer. Installation labor, assembly, electrical hookup those costs directly tied to putting the energy equipment in place are typically eligible. Engineering and design fees can qualify too, though they often need to be allocated on a pro rata basis between ITC-eligible and non-eligible portions of a project. Permitting costs generally follow the same logic. And for projects with a maximum net output of five megawatts or less, the IRA specifically allows qualified interconnection property costs to be included in the basis a meaningful addition for smaller commercial and community-scale projects.
What Doesn’t Make the Cut
This is where diligence really earns its keep. Land costs are excluded from the Section 48 investment tax credit basis no exceptions. Power purchase agreements, goodwill, going concern value, and renewable energy certificates are all specifically called out in Treasury regulations as non-eligible. Legal fees for structuring the ownership entity don’t qualify. Neither do reserve accounts or most financing-related costs beyond construction loan fees.
And then there’s the developer fee probably the single most scrutinized line item in any ITC basis analysis. Developer fees aren’t automatically disqualified, but the IRS has a long history of challenging fees that look inflated, especially in related-party transactions. If the development entity and the project entity share common ownership, expect any buyer (and any insurance underwriter) to dig into whether that fee reflects genuine arm’s-length value or is padding the basis to inflate the credit.
Here’s the thing that trips up less experienced sellers: The investment tax credit basis is generally based on the taxpayer’s cost of eligible property, subject to applicable tax basis rules and limitations. A project might appraise for more than it cost to build, but the ITC doesn’t care about that delta. The credit is anchored to what was actually spent on eligible property, with narrow exceptions that rarely apply in standard transfer scenarios.
How Buyers Actually Verify This
Sophisticated tax credit buyers don’t just review a cost summary spreadsheet. They commission independent ITC studies often through accounting firms that specialize in cost segregation which walk through every line item in the project budget and classify it as eligible, partially eligible, or excluded. These studies typically allocate shared soft costs using reasonable methods, like a percentage of qualifying direct costs, and flag any items where the treatment requires judgment.
The buyer’s tax counsel will cross-reference the study against the transfer agreement’s representations and warranties. If the seller represented a basis of $40 million but the study supports $36 million, that’s a deal-level conversation potentially a price adjustment, an indemnity provision, or in some cases, a walkaway.
Tax credit insurance plays a role here too. Underwriters are increasingly requiring completed ITC studies before they’ll bind coverage, which means the investment tax credit buyer effectively gets a second layer of validation from the insurance diligence process.
Conclusion
The qualified cost basis behind an investment tax credit isn’t a number you take at face value. It’s a number you build, test, and defend line item by line item. For buyers in the transferability market, the diligence on what’s actually in the basis is where value is either confirmed or corrected. Getting it right isn’t optional. It’s the foundation that every pricing decision, every insurance policy, and every indemnity provision rests on.
