The Project Finance Cash Waterfall: An Ordering That Silently Defines Your DSCR

Here is a two-million-dollar-a-year maintenance obligation. It is real, it is contractual, and the project will pay it every year.

Put it above the debt service line in the waterfall and CFADS is $22m, the facility sizes at $176.5m, and the coverage ratio is 1.30×.

Put it below — funded from a reserve that sits after senior debt service — and CFADS is $24m, the facility sizes at $192.6m, and the coverage ratio is still 1.30×.

Same project. Same cash. Same obligation. $16.0m more debt, a 9.1% increase, from a drafting decision. And the coverage the project actually has, measured on cash genuinely available after the maintenance is paid, is 1.19×.

The waterfall is the contractual cash-application order. CFADS is usually a separately defined financing term. They should be reconciled line by line because obligations paid before senior debt service often reduce economic cash available for debt service, while items funded after debt service may not enter the contractual DSCR numerator.

ℹ️ Note: Waterfall ordering is deal-specific and varies by facility agreement. The structure described is indicative; the analytical point about the debt service line is general.

What Is a Cash Waterfall?

The contractual order in which project revenue is applied. Cash enters a proceeds account and is paid out in a defined sequence, with each level fully satisfied before anything flows to the next — so equity, at the bottom, receives only what survives every obligation above it.

The guiding principle is that cash should first provide for all expenses necessary to maintain ongoing operations, then senior debt service, then the replenishment of senior debt protections, and only then anything else.

One Filed Waterfall, and Why Precedent Is Not a Definition

There is no universal “standard order.” A 2026 SEC-filed project agreement applies project cash first to operating expenses, second to scheduled debt service, then to working-capital reserve, DSRA, capex/contingency reserve and finally available cash for distribution. Other financings place taxes, hedging, fees, reserve accounts or mandatory prepayments in different positions.

The diligence method is therefore:

Revenue / proceeds account
→ every permitted operating payment
→ scheduled financing costs and debt service
→ reserve funding / replenishment
→ mandatory prepayments / sweeps
→ subordinated payments
→ restricted-payment test
→ distribution account

Then reconcile each step to the separate CFADS definition used for covenant and sizing purposes.

The Line That Defines CFADS

This is the analytical core, and it is why the waterfall deserves more attention than it usually gets from the people building models.

For the worked example, CFADS is modelled as cash available immediately before senior debt service. In an executed financing, use the contractual CFADS definition rather than assuming the account waterfall creates it. Then test whether the two structures reconcile. Under that worked convention:

• Anything above that line is netted out of CFADS. It reduces the numerator of the DSCR and therefore reduces the sized debt.
• Anything below is not. It is paid from the residual, and the coverage ratio never sees it.

That means the waterfall position of any recurring obligation is a debt sizing decision. Not indirectly — directly, through the formula.

the first post in this sequence made the point that CFADS is a defined term rather than an accounting fact. The waterfall is where that definition actually lives. A negotiation about whether major maintenance sits above or below the debt service line reads as documentation and is in fact a negotiation about $16m of leverage.

Which Positions Are Actually Contested?

Three, and each for a different reason.

Taxes. Read the cash-management and CFADS definitions. Some structures deduct cash taxes before debt service; others route tax accounts separately. The modelling question is not whether tax is “normally above the line,” but whether the contractual DSCR numerator deducts the cash tax obligation actually borne by the project.

Major maintenance and overhauls. The worked example intentionally shows why classification matters. A lender can deduct the expected cost directly from CFADS, require a forward-funded reserve, or combine both through a contractual maintenance budget. The executed definition should determine the model; do not assume a “common compromise.”

Maintenance capex versus operating cost. Related but distinct: the boundary between routine O&M (unambiguously above the line) and capital maintenance (arguable) is drawn in the definitions, and the drafting is worth reading closely. A generous definition of capital maintenance moves cost below the line and lifts the debt.

The general test a lender should apply, and a sponsor should expect: is this cash the project must spend to keep generating? If so it belongs above the line, wherever it is classified for accounting purposes. A ratio computed on cash the project cannot actually keep is measuring something that does not exist.

There is a fourth position that is contested less often than it should be, and it has become more important with battery storage. Augmentation — adding cells to restore a battery's capacity as it degrades — is neither routine maintenance nor an overhaul. It is a periodic, large, entirely predictable capital requirement without which the asset stops meeting its contracted capacity, and it recurs on a cycle measured in a handful of years rather than once in the project's life.

The cycle-economics post in market structure material is directly relevant: augmentation timing depends on how hard the asset has been cycled, which depends on the operating strategy, which is not fixed at financial close. So the obligation is certain in principle and uncertain in timing, which is the worst combination for a waterfall position — a reserve funded to a schedule may be too slow if the asset is cycled hard, and a cost above the line in every year overstates what is actually spent.

The structures that handle this well tie the reserve funding rate to measured throughput rather than to elapsed time, which aligns the funding with the thing that actually consumes the asset. That is more drafting work than a flat annual contribution and it is the difference between a reserve that is there when the augmentation is needed and one that is not.

Accounts, Not Just Order

A waterfall is implemented through a structure of bank accounts, and the account structure is what makes it enforceable rather than aspirational.

Project financings can use controlled revenue, reserve and distribution accounts, but the exact account architecture varies. The 2026 Project Swift financing, for example, uses a detailed Common Security and Account Agreement with a multi-level cash waterfall and restricted-payment conditions; another filed facility requires ongoing DSRA funding through the cash waterfall. Build the model from the account agreement rather than a generic six-account template.

Two features matter beyond the list.

All accounts are secured. Cash sits inside the lenders' security perimeter until it reaches the distribution account. That is what makes a lock-up effective — the trapped cash is not merely undistributed, it is charged.

Movement between accounts is conditional. Transfer requests, account-bank controls, restricted-payment certificates and agent instructions convert covenant tests into cash control. The exact certificate and consent process is a finance-document question.

A model that represents the waterfall as a sequence of subtractions without representing the accounts will produce the right cash flows and miss the timing — because a payment date and a test date are not the same date, and funds are transferred in advance of the former on the basis of the latter.

What About the Construction Waterfall?

A different document doing a different job, and conflating the two is a common modelling error.

During construction there is no revenue and therefore no waterfall in the operating sense. What exists instead is a drawdown order: the sequence in which equity and debt fund the construction budget. Three conventions appear.

Construction funding can be equity-first, pro rata, debt-first against committed equity, or a hybrid. Filed project arrangements show explicit pro rata rules and also structures where available construction loans are drawn before additional equity until a target debt/equity ratio is reached. The signed funding agreement — not a market convention — determines the sequence.

The choice moves the equity IRR noticeably, because it changes the timing of the largest single outflow in the project's life. It is also one of the few structural terms where the sponsor's own credit quality translates directly into return — a sponsor with an investment grade parent can often obtain debt-first funding that a developer cannot.

Two modelling points follow. The construction drawdown order determines interest during construction, which can feed project cost and the gearing test. And the construction funding mechanics have their own account and requisition structure, which should be reproduced from the facility and account documents rather than assumed.

Where Do Insurance and Asset Sale Proceeds Go?

Outside the ordinary waterfall, into a mechanism with a threshold and a choice.

Extraordinary receipts often have separate mandatory-prepayment or reinstatement mechanics. Insurance, condemnation, asset-sale and claim proceeds should be mapped from the dedicated proceeds clauses rather than assumed to follow the ordinary operating waterfall.

The usual structure has a threshold. Below it, proceeds are released to the project for ordinary use. Above it, the borrower must elect, within a defined period and subject to lender consent, between reinstatement — applying the proceeds to repair or replace the damaged asset — and mandatory prepayment of the debt.

The logic is sound. A small claim should not disrupt the financing. A large one raises a genuine question: is the asset worth rebuilding, and if so is the project's economics after rebuilding still capable of servicing the original debt?

Business-interruption proceeds may be included in project revenues or routed under separate proceeds provisions, depending on the credit agreement. Treat their DSCR effect as a contractual-definition question.

The connection to earlier material is direct: the recapture post noted that a casualty can be an ITC recapture event, and the change-in-law and force majeure posts covered the contractual side. Insurance proceeds sit at the intersection of all three, and the waterfall is where they land.

What Sits Outside the Waterfall Entirely?

A short list, and each item is there for a reason.

Hedge payments. The finance documents determine whether scheduled hedge payments rank with senior financing costs, whether termination payments receive the same priority, and what happens on enforcement. Model the actual intercreditor and account-agreement priority.

Hedge termination payments are a different question and one that is genuinely negotiated. A large termination sum falling due on an early prepayment or a default can be substantial, and whether it ranks with senior debt or below it determines who bears it in a workout. Sponsors should establish where it sits before they need to know.

Pass-through taxes. VAT and similar amounts may be handled through dedicated accounts or excluded from defined project revenues. Verify the tax-account mechanics before deciding whether they enter CFADS or the operating waterfall.

Trapped cash during a lock-up, as the previous post described, does not flow onward. It stops at the distribution test and accumulates inside the security perimeter.

The general point about the list is that each exclusion needs a stated reason. A waterfall that quietly omits an obligation because it did not fit the precedent is a waterfall that will not describe what happens to the cash — which is the only thing it exists to do.

Where Does the DSRA Sit, and Why?

There is no universal DSRA position or duration. A filed 2014 project facility required a reserve equal to the next three months of principal and interest, while other financings define a dynamic Required Balance and fund it through the waterfall. Extract both the position and the required-balance formula from the documents.

The position is deliberate. The reserve exists so that the project can continue paying the lender even if the plant is down for an extended period — so it must be funded ahead of any discretionary payment, but it is not itself debt service and so does not sit above the line.

Two variants are worth knowing.

Funding before or alongside scheduled debt service. More conservative, and it means the DSRA must be topped up before the current period's principal is paid. Rare, but it appears where the lender is particularly concerned about volatility.

Letter of credit in lieu of cash. Where the finance documents permit an LC-backed DSRA, the economics differ from cash funding: the project pays LC fees and consumes bank / sponsor credit capacity instead of trapping the same amount of cash. Compare those costs explicitly.

What Happens in a Shortfall?

The cascade stops where the cash runs out, and where it stops determines what kind of problem the project has.

Cash covers through	Consequence
Opex, tax, full debt service	Normal
...but not DSRA replenishment	Reserve deficiency; distributions blocked
...but not full debt service	DSRA drawn to meet the payment
DSRA depleted, payment missed	Payment default

That ladder is why reserve deficiency, a reserve draw and a payment default are different states. The amount of time between them is whatever the DSRA Required Balance and payment schedule actually provide.

It also explains why the reserve restoration condition in the distribution test matters so much. A project that has drawn its DSRA is one step from a payment default, and the lender will not release cash to equity until that step is restored.

How Do You Model the Waterfall in Excel?

As a cascade with an explicit CFADS line, and with the sizing consequence of each position made visible.

The cascade

Revenue
  less Operating costs
  less Taxes
= CFADS                                    ← the line

  less Senior interest
  less Senior principal
= Cash after debt service

  less DSRA funding to required balance
  less Maintenance reserve funding
= Cash available for sweep

  less Mandatory prepayment
  less Subordinated debt service
= Cash available for distribution

  Distribution test?  →  distribute  or  trap

The position test, which is the point of the post

Maintenance capex ABOVE the line
   CFADS                                      = $22,000,000
   Max debt service at 1.30×                  = $16,923,077
   Sized debt (18 yrs @ 6.5%)                 = $176,549,431

Maintenance capex BELOW the line
   CFADS                                      = $24,000,000
   Max debt service at 1.30×                  = $18,461,538
   Sized debt                                 = $192,599,379
                                                ------------
   Additional debt from the drafting          = $16,049,948   (+9.1%)

The coverage the project actually has

True cash available after maintenance         = $22,000,000
Debt service under the "below" structure      = $18,461,538
Actual coverage                               =        1.192×

The covenant says 1.30×. The project has 1.19×. That difference is not an error in anyone's model — both numbers are correctly computed from their own definitions. It exists because a real, recurring, certain cash cost was placed below the line that defines the ratio.

ℹ️ Note: Build a second, unadjusted coverage ratio alongside the contractual one — CFADS with every committed cash cost deducted, regardless of waterfall position — and report both. The contractual ratio is what the agreement tests. The unadjusted ratio is what the project can actually pay. A structure where those diverge by more than a few basis points deserves an explanation.

To build the full waterfall with account structure, the position sensitivity and the unadjusted coverage ratio, prompt Dezzmond with your cost profile and term sheet.

What Do Sponsors and Lenders Actually Check?

• Where does the CFADS line fall, and which costs sit above it?
• Is major maintenance above the line, below it, or in a scheduled reserve?
• What is the unadjusted coverage ratio with every committed cost deducted?
• Is the DSRA funded in cash or by letter of credit, and what else needs that facility?
• Does the model represent accounts, or only a sequence of subtractions?
• Where does the sweep sit relative to the distribution test?
• What does the cascade do in a shortfall, and how many months of reserve are there?

Frequently Asked Questions

What is a cash waterfall?

The contractual order in which project revenue is applied — operating costs, taxes, senior debt service, reserve funding, subordinated debt and finally equity — with each level satisfied in full before the next receives anything.

Why does the waterfall order affect debt sizing?

Because CFADS is the cash available immediately before senior debt service. Anything above that line reduces CFADS and therefore the sized debt; anything below does not. Moving a $2m annual cost across that line changes the facility by 9.1% on the worked example.

Where should major maintenance sit?

The treatment of major maintenance is negotiated through the CFADS and reserve definitions. A scheduled reserve can be one solution, but the model should reflect the exact contractual treatment rather than infer lender and sponsor positions from a template.

Where does the DSRA sit?

The account agreement decides. Filed financings show different waterfall positions and Required Balance formulas, including a three-month debt-service reserve and facilities that replenish the DSRA through the cash waterfall until a defined Required Balance is reached.

Is there a waterfall during construction?

Not in the same sense — there is no revenue. What exists is a drawdown order: equity first, pro rata, or debt first against an equity commitment. The choice moves the equity IRR because it changes when the largest outflow occurs.

Where do insurance proceeds go?

The proceeds and mandatory-prepayment clauses decide. Some financings distinguish reinstatement proceeds, business-interruption proceeds and mandatory-prepayment amounts; model the signed treatment rather than a generic threshold rule.

What happens if cash runs out partway down?

The cascade stops at the first unpaid priority item. Whether a reserve deficiency itself is a default, whether the DSRA can be drawn, and when a payment default occurs depend on the account and credit agreements. One filed facility expressly says failure to maintain the DSRA balance is not itself an Event of Default, while failure to apply cash through the waterfall can be.

Closing: The Ordering Is the Definition

The waterfall looks like machinery. It is treated as machinery in most credit agreements — a schedule at the back, drafted from a precedent, reviewed for consistency rather than for economics.

It is the definition of the coverage ratio. The line between senior debt service and everything below it determines what CFADS means, which determines the sized debt, which determines the covenant, which determines when distributions stop. Every one of the previous five posts in this series operates on a number that this schedule defines.

The practical consequence is that a sponsor pushing costs below the line is not finding efficiency; it is raising leverage against cash it will still have to spend, and buying a covenant that reports coverage the project does not have. Sometimes that is the right trade — more leverage at a slightly thinner real cushion is a legitimate structuring choice. But it should be made deliberately, with both ratios on the page, rather than discovered later when the contractual ratio passes and the bank account is empty.

the next post takes the mechanism that sits in the middle of the waterfall and changes the equity return more than any other single term: the cash sweep.

Sources: 2026 SEC-filed project agreement — operating expenses → debt service → working capital reserve → DSRA → capex/contingency → distributions · 2026 Project Swift account-agreement amendment — multi-level cash waterfall and restricted-payment conditions · SEC-filed facility — DSRA funding through cash waterfall and DSRA-deficiency treatment · SEC-filed facility — three-month DSRA requirement · Dezzmond analysis; worked-example assumptions are illustrative.