Sale-Leasebacks and Inverted Leases: The Two Structures That Are Not Flips

Roughly four out of five solar tax equity deals are partnership flips. The remaining fifth uses one of two structures that solve the same problem differently — and each does something a flip cannot.

A sale-leaseback can be executed up to three months after the project is already operating. Every other structure has to be in place before the asset goes into service, which makes the leaseback the only one available to a developer that has already energised a project and then found it needs tax equity.

This is the second post in the tax structuring series. You will get how each structure works, what the ninety-day window is worth, why an inverted lease hands back half the credit as income, the overlapping ownership variant that raises more, the recapture exposure specific to leases, and which sponsors cannot use the structure at all.

ℹ️ Note: This describes how these structures work in practice. It is not tax or legal advice — lease characterisation and pass-through elections are highly fact-specific.

Three Structures, One Question

All three answer the same question — who owns the asset for tax purposes, and how do the benefits reach someone who can use them — and they answer it in three different places.

	Partnership flip	Sale-leaseback	Inverted lease
Who owns it	A partnership of both	The investor	The solar company (lessor)
Who gets the ITC	Investor, 99% pre-flip	Investor (all benefits)	Investor, as lessee
Who gets depreciation	Investor, 99% pre-flip	Investor	The solar company
Timing	Before in service	Up to 3 months after	Before in service
Basis step-up	To fair market value	To FMV, but taxable gain	ITC on FMV, no gain
Capital raised	35–50% of capital stack	Theoretically full FMV	20–42%
Market share (solar)	~80%	Utility-scale, declining	Mainly rooftop

Norton Rose Fulbright confirms the market shape: partnership flips dominate at roughly 80% adoption, with sale-leasebacks and inverted leases splitting the remainder, and inverted leases raising "the least amount of tax equity."

How Does a Sale-Leaseback Work?

The investor buys the project outright and leases it back to the developer, who continues to operate it. Norton Rose describes the appeal directly: the investor obtains "all the tax benefits" without partnership complexity.

That simplicity is the structure's main attraction. There is no capital account to track, no deficit restoration obligation, no flip date to model, and no argument about whether the investor is really a partner — it owns the asset outright, which is about as unambiguous as tax ownership gets.

The developer becomes a lessee. It pays rent, operates the project, and typically holds an option to repurchase at the end of the lease term — subject, as covered in the termination values post, to the fair market value constraint that applies to any purchase option in a tax-driven structure.

What Is the Ninety-Day Window Worth?

Optionality nothing else provides. Norton Rose sets out the timing rules across the three structures: sale-leasebacks can be executed "up to three months after the asset is put in service," while partnership flips "must be established before the project operates" and inverted leases must close "before assets go into service."

That difference has real consequences.

It is a remedy, not just a structure. A developer that placed a project in service intending to hold it, and then found it could not use the tax benefits — because its own tax position changed, or a planned tax equity deal collapsed — has one option left, and it expires ninety days after commercial operation.

It reduces execution risk on the original financing. Knowing that a leaseback remains available after COD changes the negotiating position in a flip that is running late against a placed-in-service deadline.

It is a hard deadline. Three months after in-service, that option closes. It belongs in the development schedule as a dated item rather than as a piece of structuring theory.

What Does a Sale-Leaseback Cost?

Tax on the gain, and the asset. Norton Rose notes that for basis purposes, flips and leasebacks both step to fair market value, but "sale-leasebacks create taxable gain for the company."

That is the central trade. Selling the project at fair market value steps the basis up — which increases the credit and the depreciation available to the investor, making the structure valuable — but a sale at fair market value is a disposal, and the developer recognises gain on it.

The second cost is ownership. In a flip the developer remains a partner throughout and buys out a 5% residual. In a leaseback it has sold the asset and must repurchase it, at fair market value, years later. The repurchase price is a function of how well the project performed, which means a successful project is more expensive to buy back.

When Is a Lease Actually a Lease?

This is the question every lease structure rests on, and it is the same question the flip post ended on wearing different clothes.

In a partnership flip the issue is whether the investor is genuinely a partner or a disguised lender. In a lease it is whether the arrangement is a true lease — with the lessor bearing real ownership risk — or a financing dressed as one. If a sale-leaseback is recharacterised as a secured loan, the investor never owned the asset, and a credit claimed on the basis of ownership was never available.

The features that support the characterisation are the mirror image of the flip conditions.

A purchase option at fair market value. The same rule appears in every structure in this series for the same reason. An option to reacquire the asset at a predetermined bargain price means the lessee always intended to own it and the lessor never bore residual risk.

Genuine residual exposure. The lessor must be exposed to what the asset is worth at the end of the term. A lease running for essentially the whole economic life of the equipment, with nothing meaningful left at expiry, looks like a purchase paid in instalments.

Real economic substance beyond tax. The arrangement should make commercial sense to both parties on terms that are not solely explained by the tax result.

The practical consequence for diligence is that lease documentation carries more weight than it looks like it should. Rent levels, term length relative to useful life, renewal rights, early termination provisions and the option price are not commercial details sitting on top of a tax structure — they are the tax structure, and a concession on any of them can unwind the whole thing.

How Does an Inverted Lease Work?

By splitting the credit from the depreciation and sending them in opposite directions. Norton Rose describes the rooftop version: a solar company "assigns customer agreements and leases rooftop solar systems in tranches to a tax equity investor who collects the customer revenue and pays most of it to the solar company as rent."

The tax result is the inversion the name refers to. The investor, as lessee, claims the investment tax credit. The solar company, as lessor, keeps the depreciation and uses it to shelter the rent it receives.

Two features make the structure attractive to a rooftop developer.

The asset comes back for free. Norton Rose notes solar companies prefer the structure because they "get the equipment back when the lease ends without having to pay for it" — in contrast to a leaseback, where repurchase is at fair market value.

The rents are financeable. The company can "monetize the projected rents by borrowing 'back-levered' debt," which Norton Rose observes may be easier to arrange than the equivalent financing against a partnership flip position.

And the basis treatment is favourable: the investment tax credit "is calculated on the fair market value" without triggering gain recognition, because leasing an asset is not a disposal.

Why Does the Lessee Give Half the Credit Back?

Because the pass-through comes with an income inclusion. Norton Rose states it plainly: the investor claiming the ITC as lessee "must report half the investment credit as income ratably over five years."

This is the single most important number in the structure and it is easy to miss when comparing headline credit amounts. The lessee does not receive a clean credit — it receives a credit and a corresponding income pickup of half that amount, spread over five years.

The economic effect is not to halve the credit; it is to reduce its value by tax on half of it. On a $75m credit, $37.5m of income at a 21% marginal rate costs roughly $7.9m — around 10% of the credit's face value, spread across five years and therefore slightly less in present value terms.

That drag is a significant part of why the structure "raises the least amount of capital: roughly 20% to 42% of the capital stack." The investor is buying a credit worth about ten percent less than its face, without any depreciation attached.

What Is the Overlapping Ownership Variant?

A way to give the investor some depreciation as well, and raise more capital as a result.

In the conservative form, capital moves "from the lessee to lessor as prepaid rent" and the split is clean: credit to the lessee, depreciation to the lessor. In the overlapping ownership structure, Norton Rose describes the investor contributing capital to a lessee partnership, which then contributes to the lessor in exchange for a 49% interest.

The investor then claims both the investment tax credit and 49% of the depreciation. Norton Rose notes this "raises more tax equity because there are more tax benefits" — which is the whole point. The additional complexity buys additional benefit to sell.

The trade-off is exactly the complexity. A structure with a lessee partnership holding a minority interest in the lessor is harder to explain, harder to diligence and harder to unwind than a straightforward lease, and the population of investors willing to transact in it is smaller still.

How Does Recapture Work in a Lease?

On a five-year clock, with triggers specific to the leasehold. Norton Rose sets out the exposure: the "unvested" investment credit must be repaid "if the lease terminates or the investor transfers its leasehold interest within five years."

Two points follow.

The trigger is the lease, not the asset. In an ordinary ITC structure, recapture follows a disposal of the property. Here, terminating the lease or transferring the leasehold does it — which makes the lease term itself a recapture-critical document, and makes early termination rights something to negotiate with the five-year clock in view.

There is a clean exit. Norton Rose notes there is "no recapture of the investment tax credits if the lessee purchases the equipment from the lessor." A purchase by the lessee ends the lease without triggering the unvested credit, which makes it the preferred route where the parties want to conclude early.

Who Cannot Use an Inverted Lease?

A defined group, and the exclusion is absolute. Norton Rose lists them: "government agencies, tax-exempt entities, Indian tribes and real estate investment trusts cannot elect to pass through the investment tax credit to a lessee."

That matters more than it once did. Direct pay under section 6417, covered later in this series, exists precisely because tax-exempt and governmental entities have no tax liability to offset — and the inverted lease, which might otherwise have been a route for them to monetise a credit, is closed by election eligibility rather than by economics.

For a REIT the exclusion is a structuring constraint of a different kind, since REITs hold real property and solar assets frequently sit alongside them.

What Happens If the Project Underperforms?

Each structure puts the shortfall in a different place, and the differences are larger than the headline economics suggest.

In a partnership flip, as the previous post covered, underperformance delays the flip. The investor reaches its target yield eventually; the sponsor waits longer for its back-end. Risk lands almost entirely on the developer.

In a sale-leaseback, the developer owes rent regardless. Lease payments are a fixed obligation, not a share of project cash flow, so a project generating less than expected still pays the same rent out of a smaller revenue line. That is the sharpest version of the risk in any of the three structures — it converts a variable revenue stream into a fixed liability, which is precisely what a lease is.

In an inverted lease, the rents the lessor receives depend on the revenue the lessee collects, so a shortfall is shared rather than absorbed by one side. The developer's back-levered debt, secured on those rents, is the exposed position — which is the same structural point the flip post made about back-leverage, arriving through a different structure.

The modelling consequence is that a downside case should be run structure by structure rather than at project level. A generation shortfall that costs a flip sponsor two years of flip delay can cost a leaseback lessee a fixed rent it cannot cover, and the two are not comparable on a single sensitivity.

Why Have Sale-Leasebacks Declined?

They remain common for utility-scale projects and are, as Norton Rose describes, "far less common today than in the past." Two forces explain most of it.

The first is the gain. Selling the project at fair market value is a disposal, and a developer that has built at cost and sells at market recognises the difference immediately. In a market where developers hold larger pipelines and manage their tax position across them, a structure that accelerates gain is less attractive than one that does not.

The second is retained ownership. Developers increasingly want to keep their assets — for portfolio value, for refinancing optionality, and because an operating fleet is worth more than a development margin. A leaseback sells the asset and buys it back later at whatever it is then worth, which is the opposite of that strategy.

What keeps the structure alive is the ninety-day window and the simplicity. There is no partnership to negotiate, no capital account to track, no flip to model — and for a developer that needs tax equity on an asset already in service, it is the only structure available at all.

How Do You Compare the Structures in Excel?

On capital raised net of the cost of raising it. Headline capacity is misleading because each structure carries a different friction.

The inputs

Assumptions, labelled as such:

Project fair market value             $250,000,000
ITC rate                              30%
Gross ITC                             $75,000,000
Marginal tax rate                     21%
Developer tax basis in project        $190,000,000

Sale-leaseback

Capital_Raised      = up to full FMV                        = $250,000,000
Taxable_Gain        = 250,000,000 − 190,000,000             =  $60,000,000
Tax_On_Gain         = 60,000,000 × 21%                      =  $12,600,000
Asset_Recovery      = repurchase at FMV, years later
Timing              = available up to 3 months post-COD

Inverted lease

Capital_Raised      = 20% to 42% of stack   (say 30%)       =  $75,000,000
Credit_To_Lessee    =                                          $75,000,000
Income_Inclusion    = 75,000,000 × 50%                      =  $37,500,000
Tax_On_Inclusion    = 37,500,000 × 21%                      =   $7,875,000
Effective_Credit    = 75,000,000 − 7,875,000                =  $67,125,000
Depreciation        = retained by developer
Asset_Recovery      = free, at end of lease

Partnership flip, for comparison

Capital_Raised      = 35% to 50% of stack   (say 42%)       = $105,000,000
Benefits_Sold       = credit AND depreciation
Asset_Recovery      = buy out 5% residual at FMV
Timing              = must be in place before in service

The comparison that matters

Structure          Capital raised   Friction cost   Asset back at
Sale-leaseback       $250,000,000    $12,600,000    FMV repurchase
Partnership flip     $105,000,000    flip delay risk  5% residual at FMV
Inverted lease        $75,000,000     $7,875,000    free

Three different answers to three different questions. A developer maximising capital takes the leaseback and pays tax on the gain. One maximising retained ownership takes the inverted lease and accepts less capital. One in the middle — which is most of the market — takes the flip.

ℹ️ Note: Model the inverted lease credit net of the income inclusion from the outset. Comparing a gross $75m ITC in a lease against a gross $75m ITC in a flip overstates the lease by roughly ten percent of the credit, and that error is large enough to pick the wrong structure.

To run the full version — all three structures on your own basis and fair market value, with the inclusion, the gain and the repurchase modelled through — prompt Dezzmond with your project economics.

What Do Investors and Lenders Actually Check?

• Is the lease a true lease for tax purposes? The characterisation carries the whole structure.
• For a leaseback, was it executed within three months of in-service? A hard deadline.
• What is the gain on sale, and is it funded? The tax is payable whether or not the proceeds were spent.
• For an inverted lease, is the income inclusion modelled? Half the credit, ratably over five years.
• Is the repurchase option at fair market value? As with every other structure in this series.
• What triggers recapture, and who bears it? Lease termination and leasehold transfer within five years.
• Is the sponsor eligible to make the pass-through election? Not available to government agencies, tax-exempt entities, tribes or REITs.

Frequently Asked Questions

What is the main advantage of a sale-leaseback?

Timing and simplicity. It can be executed up to three months after the asset is placed in service — the only structure available after commercial operation — and the investor takes all the tax benefits without partnership complexity.

Why does an inverted lease raise less capital?

Because the investor receives only the credit, not the depreciation, and must report half the credit as income ratably over five years. Both effects reduce what the benefit is worth, so the structure raises roughly 20% to 42% of the capital stack.

Who keeps the depreciation in an inverted lease?

The solar company as lessor, which uses it to shelter the rent it receives. In the overlapping ownership variant the investor also takes 49% of the depreciation.

What triggers recapture in a lease structure?

Termination of the lease or transfer of the investor's leasehold interest within five years. There is no recapture where the lessee purchases the equipment from the lessor.

Can a tax-exempt entity use an inverted lease?

No. Government agencies, tax-exempt entities, Indian tribes and REITs cannot elect to pass through the investment tax credit to a lessee — which is part of why direct pay exists.

Closing: Three Structures, Three Different Things Being Sold

The partnership flip sells the credit and the depreciation together, inside a partnership, and returns the asset through a 5% residual buyout. The sale-leaseback sells the asset itself, raises the most capital, triggers tax on the gain, and is the only route still open after a project is running. The inverted lease sells the credit alone, at a discount created by the income inclusion, and gives the asset back for nothing.

Which is right depends on what the developer is short of. Capital, tax capacity, ownership, or time — and the structure that maximises one of those will usually be worse on the others.

The next post takes the constraint that shapes all three: what happens when a tax equity investor runs out of basis, and why losses suspend part-way through a deal that was modelled on taking them.

Sources: Norton Rose Fulbright — Solar Tax Equity Structures · Norton Rose Fulbright — Inverted Leases · Norton Rose Fulbright — Partnership Flips: Structures and Issues