A Tax Equity Deal Through Time: Why 'Funding at COD' Is Usually Too Simple
One of the easiest lines to write in a sources-and-uses schedule is also one of the easiest to get wrong:
Tax equity funding at COD $75m
It looks harmless. The project finishes, the investor funds, construction debt comes down, everybody moves on.
Real transactions are messier. Mechanical completion can happen before the project is placed in service. COD can mean something different under the PPA than under the financing documents. The investor may fund in more than one installment. The last installment may depend on an appraisal, tax opinion, final cost certification, no default, and a stack of project documents that all have to be in the right place at the same time.
A model that uses one date for all of that can be perfectly balanced and still be short of cash. The timeline is therefore not administrative detail. It is part of the financing.
The first mistake is treating a commitment as cash
A signed tax equity commitment is valuable. It is still not the same thing as money in the project account.
Every contribution has conditions. Some are straightforward. Others are exactly the kind of thing that can slip while construction is finishing: completion certificates, placed-in-service evidence, final appraisal work, tax deliverables, updated representations, insurance, interconnection status, or lender releases.
If the investor is expected to put in $50 million in August and that contribution moves to September, the project has to fund August somehow. That usually means one of three things happens:
- construction debt stays outstanding;
- a bridge remains drawn;
- the sponsor writes the cheque.
The economic consequence is not hidden. It is interest, fees and liquidity.
What is often hidden is the assumption that created it. I would never model a tax equity contribution with only an amount and a date. At minimum it needs an amount, a scheduled date, the milestone that makes it due, and the source that covers the project if it slips.
That extra information turns "tax equity funding" from a plug into an actual financing source.
The transaction starts before the documents are finished
By the time the investor is negotiating definitive documents, it has already priced a version of the project. That version has a cost, a credit amount, an expected placed-in-service date, a depreciation profile, cash distributions, and a forecast flip. It also has an assumed structure: which entity owns the project, which entity the investor buys into, how much leverage sits below the partnership, and what the sponsor intends to own later.
The term sheet fixes enough of that architecture for both sides to decide whether the deal is worth documenting. The interesting items are not the ones that sound like tax law. They are the ones that move money:
| Term | Why the finance team cares |
|---|---|
| Investor commitment | Size of the future source |
| Funding installments | When the source is actually available |
| Funding conditions | What can delay or reduce it |
| Cash-sharing ratio | Sponsor distributions before the flip |
| Yield / flip mechanics | How long the investor stays in the richer economics |
| True-up | Whether the commitment can move after final cost is known |
| Indemnities | Where tax risk lands if the position fails |
| Exit mechanics | What the sponsor has to pay to clean up the structure |
A tax equity term sheet is not a tax memo. It is an outline of a financing whose returns happen to be heavily tax-driven.
Funding conditions come from several workstreams at once
The final contribution can depend on conditions that live in different teams and therefore fail at different times.
I would group them into four buckets.
Project completion conditions. Mechanical completion, substantial completion, placed-in-service evidence, interconnection status, permits, testing and independent-engineer certificates.
Tax conditions. Tax opinions, final tax-basis support, credit qualification, bonus-credit support where relevant, entity and ownership conditions, and any tax-related representations that have to be refreshed.
Financial conditions. Construction debt status, agreed leverage, reserve funding, no default, updated model outputs and satisfaction of any conditions tied to bridge repayment.
Document conditions. Executed project agreements, required consents, insurance, assignments, opinions and closing deliverables.
Those buckets rarely finish on the same day.
That is exactly why a single "tax equity funding date" hides risk.
A better closing schedule tracks the condition that is currently controlling the contribution.
Expected contribution date 31 July
Current critical path final tax basis certificate
Next-most-likely blocker utility PTO
Bridge maturity 15 August
Sponsor liquidity if delayed $12m
Now the financing team can see the problem before it becomes a funding emergency.
Three dates that should not be one variable
Mechanical completion, placed-in-service and COD often sit close together in the base case. That is probably why models keep collapsing them into one cell.
They answer different questions. Mechanical completion comes from the construction documents. It tells you where the EPC scope stands.
Placed in service is a tax concept. It matters to credit and depreciation timing.
COD is contractual and can be defined differently under the PPA, financing documents and EPC agreement. In a clean base case, all three may happen within days.
In the downside case, they are exactly the dates that separate. A project can be mechanically complete and still be waiting for energisation. It can satisfy a contractual COD definition while final tax deliverables are still being assembled. It can be producing power while an appraisal or cost certification needed for the final tax equity contribution is still open.
So I would model them separately even if they currently point to the same day. That is not model complexity for its own sake. It is a cheap way to expose a real liquidity risk.
Mechanical completion 15 June
Placed in service 28 June
PPA COD 2 July
Final tax package complete 18 July
Final investor funding 22 July
Move one of those dates and see what stays outstanding. That is a much more useful delay sensitivity than one generic "COD + 30 days" toggle.
A common funding shape
One common solar partnership-flip structure has historically involved a smaller payment around mechanical completion and a larger payment after the project is fully placed in service. The exact percentages are deal-specific, but the pattern is useful because it shows what the investor is trying to avoid.
It does not want all of its money exposed before the project has crossed the milestones that support the tax position and operating asset it agreed to buy into. That leaves the sponsor with a financing gap.
Suppose the project expects:
Tax equity commitment $75m
Initial contribution $15m
Final contribution $60m
Construction loan at completion $55m
If the final contribution arrives on schedule, the bridge works. If it is delayed by six weeks, the project does not suddenly become insolvent. But somebody is funding $55 million for six extra weeks, and that cost belongs in the base financing analysis because delays at this stage are not exotic.
The practical question is simple: who owns the time between physical completion and final tax equity funding? If nobody can answer that from the model, the model is incomplete.
The true-up is a financing event, not a bookkeeping clean-up
The original commitment is usually priced on estimated facts.
The final project has actual facts.
That gap can move the investor contribution in several directions:
- final eligible cost;
- final tax basis;
- actual placed-in-service timing;
- actual credit qualification;
- updated depreciation;
- agreed cash projections;
- return accrued on earlier contributions;
- costs that are excluded from the investor's pricing base.
A sponsor that treats the tax-equity amount as a fixed source can therefore finish construction with a balanced sources-and-uses and still have an equity hole.
Take a $75 million expected final investment:
Expected contribution $75.0m
Lower final eligible basis (3.0)
Delay / return true-up (1.2)
Additional qualifying cost +0.8
Final contribution $71.6m
The project did not "lose" $3.4 million at closing.
The project had always been exposed to a variable source and failed to model the variability.
This is where sponsor contingency and bridge sizing should interact with the tax-equity model.
What still has to be true at final funding
The appraisal can affect the economics of the transaction because the project value or tax basis used in the deal may matter to the amount of credit, depreciation and investor pricing, depending on the structure.
That means the appraisal is not something to request after everyone agrees the funding number. It sits upstream of the number.
The same goes for final cost data. A project originally priced on one capital cost can finish higher or lower. Some costs may be treated differently for tax purposes. The final investor contribution may therefore be subject to a true-up rather than remaining the amount shown in the term sheet.
This is where the sources-and-uses schedule can lie by being too tidy. At signing:
Tax equity commitment $75m
At final funding:
Original commitment $75m
Final cost adjustment +$2m
Tax basis adjustment -$4m
Timing / return true-up -$1m
Final contribution $72m
Those are illustrative numbers. The important point is that a committed source can still be a moving source.
If the sponsor has no contingency for that movement, the true-up becomes an equity call.
The closing dashboard
The tax team has a checklist. Counsel has a checklist. The lender has a checklist. None of those is the dashboard the CFO needs.
The CFO needs the items that can move cash or dates. I would keep it to something like this:
Unfunded tax equity commitment
Next scheduled contribution
Conditions still open for that contribution
Mechanical completion forecast
Placed-in-service forecast
PPA COD forecast Final appraisal status
Tax opinion / tax deliverables status
Final cost / basis certification status
Construction / bridge debt still outstanding
Expected funding gap if tax equity slips 30 days
Expected funding gap if it slips 60 days Current expected flip year
Recapture period end date
That dashboard connects the tax process to treasury. It also stops the team from reporting "tax equity closed" as though that means "tax equity funded."
The bridge should be sized to the commitment mechanics, not the headline commitment
A tax-equity bridge or construction facility that expects repayment from a future investor contribution is really lending against the funded portion of a contractual commitment, not against tax credits in the abstract.
The important credit questions are therefore:
- Is the investor commitment unconditional enough to be financed?
- Which conditions are objectively satisfiable by the project?
- Which conditions give the investor discretion?
- Can the contribution be reduced by a true-up?
- Can the investor suspend funding after a project default?
- What happens if one project in a portfolio fails a condition?
- Does the bridge mature before the outside date for investor funding?
Suppose the model says:
Expected investor contribution $60m
Bridge advance $55m
That looks like 92% advance coverage.
But if the commitment can true-up down to $52 million, the bridge is already over-advanced in the downside.
The right base for an advance-rate test is the lender's eligible commitment amount after its own haircuts and conditions, not the sponsor's expected contribution.
Construction debt and tax equity are negotiating over the same week
The end of construction is where two financing processes collide. The construction lender wants its completion conditions satisfied and may be preparing to convert or be repaid. The tax investor wants its own funding conditions satisfied. Those conditions overlap, but they are not identical.
The independent engineer may sign off one milestone. Tax counsel may still need another fact. The PPA may have a COD test that does not line up exactly with either.
This is where a project can be operational and still have financing completion risk. A good model therefore carries a short period after physical completion where:
- construction or bridge debt may still be outstanding;
- tax equity may still be unfunded;
- revenue may have started;
- completion support may or may not have been released.
That period is not a mistake in the model. It is often the most realistic part of it.
The construction-facility article explains the lender side of that handoff. The tax equity side should be modeled with the same care.
Closing also changes who controls future amendments
Once the tax investor is admitted, later project decisions can require another approval layer.
This matters because a development team that was previously negotiating bilaterally with a lender or offtaker can now have a third constituency.
A refinancing, amendment to the PPA, change in project debt, asset sale, material contract termination or ownership transfer may need to be tested against:
- senior lender consent;
- tax-equity reserved matters;
- interparty arrangements;
- recapture restrictions;
- sponsor back-leverage covenants.
A current Sunrun financing schedule for partnership-flip structures reflects exactly this architecture: the sponsor affiliate manages the tax-equity fund, but specified debt and lien actions require Class A consent.
That is why the tax-equity closing is a governance event as well as a funding event.
The project does not merely receive money.
It acquires another set of rights that has to be carried through every later financing decision.
After the money is in
Once the major contributions are in, the transaction shifts from funding conditions to allocations. The project earns cash. It generates credits or tax items depending on the structure. The partnership allocates taxable income, loss, credits and cash under the agreement. If the flip is yield-based, the investor's after-tax return keeps being measured.
This is where the model has to survive contact with actual performance. A weak generation year can reduce cash. A PTC project can generate fewer credits. Debt service can reduce cash available to the partnership. A tax allocation can run into basis constraints. Any of those can move the expected flip.
The key point is that funding complete does not mean economics fixed. The deal can be closed for years and still be moving toward a flip date that is not yet known.
Flip is not exit
This gets blurred in a surprising number of first-pass models. The flip changes the allocation percentages. The investor does not vanish.
It may go from receiving a large share of tax items to a small residual share. Cash sharing can change. Consent rights may change. The sponsor may then have a call option or another route to acquire the remaining interest.
That later purchase is an exit event. The flip itself is an allocation event.
If the model sets the investor's ownership to zero automatically in the flip year, it is probably giving the sponsor value it has not actually bought yet. The next article deals with the piece that moves the flip date: how the investor's after-tax return is built and why a two-year flip delay can hurt the sponsor far more than the headline tax equity yield suggests.
A better timeline model
You do not need a huge tax model to make the timing realistic. Start with one row per milestone:
Term sheet
Definitive documents
Initial investor contribution
Mechanical completion
Placed in service
PPA COD
Final appraisal
Final tax deliverables
Final investor contribution
True-up
Expected flip
Earliest expected exit
Then give each milestone three things:
- base date;
- downside date;
- cash consequence if it moves.
That last column changes the exercise. A delayed appraisal is no longer "legal workstream late." It is "$60 million of expected funding remains unavailable for another month."
A delayed placed-in-service date is no longer "tax milestone moved." It can be "the large investor contribution moves and the bridge stays drawn."
That is the level at which the finance team needs to see the transaction. The next time a model says "tax equity funding at COD," the right response is not to delete the line.
It is to ask which COD, what conditions sit behind it, and who pays if the money turns up later. Sources: SEC — Sunrun Partnership Flip Structure Characteristics · IRS Revenue Procedure 2007-65 · IRS Memorandum 201524024 · IRS Publication 541 — Partnerships · 26 U.S.C. §50 — Investment Credit Recapture