Enter Values
Key Definitions
CFADS (Cash Flow Available for Debt Service):
Project cash flow after tax, working capital, and maintenance capex, but before financing. Unlike real estate NOI, CFADS accounts for taxes and capital requirements.
Debt Service:
Total annual interest plus principal repayments on the project's senior debt.
Covenant:
The minimum ADSCR threshold specified in the credit agreement. Falling below triggers remediation mechanisms (lock-up or default).
Results
ADSCR vs Covenant Threshold
Debt Service Schedule
| Period | CFADS | Debt Service | ADSCR | Headroom | Status |
|---|
Formula Breakdown
Understanding ADSCR in Project Finance
ADSCR Formula
Calculated for each period in the debt tenor
What is ADSCR?
ADSCR (Annual Debt Service Cover Ratio) measures a project's ability to service its debt in each period. It compares CFADS (Cash Flow Available for Debt Service) to the scheduled debt payments (interest plus principal).
An ADSCR of 1.20x means the project generates 20% more cash than required for debt service, providing a buffer against cash flow variability.
CFADS vs NOI
Unlike real estate DSCR (which uses NOI), project finance ADSCR uses CFADS. Key differences:
- Taxes: CFADS is after-tax; NOI ignores taxes
- Working capital: CFADS accounts for inventory/receivables cycles
- Maintenance capex: CFADS deducts routine capital; NOI does not
Covenants: Lock-up vs Default
Project finance agreements typically have two ADSCR thresholds:
- Lock-up ADSCR: Higher threshold (e.g., 1.15x). Breach restricts distributions to equity but does not default.
- Default ADSCR: Lower threshold (e.g., 1.05x). Breach is an event of default.
The gap gives sponsors time to cure before acceleration.
ADSCR vs LLCR vs PLCR
Project finance uses three coverage ratios:
- ADSCR: Period-by-period; identifies weak periods
- LLCR: NPV of CFADS over debt life / debt outstanding; whole-loan coverage
- PLCR: NPV of CFADS over project life / debt outstanding; includes tail cash
ADSCR is typically the binding constraint for debt sizing.
Why Period-by-Period Matters
A project may have a comfortable average ADSCR (e.g., 1.50x) yet breach the covenant in one weak period (e.g., Year 3 at 1.08x). Lenders test every period because a single breach can trigger default.
The minimum ADSCR across all periods is typically the constraint that limits how much debt can be raised.
Debt Sculpting
Rather than equal principal repayments, debt sculpting tailors the repayment schedule to target a level ADSCR each period:
- Back-loads repayments into high-CFADS periods
- Results in a flatter ADSCR profile
- Maximizes debt capacity by avoiding weak-period breaches
Frequently Asked Questions
ADSCR (Annual Debt Service Cover Ratio) measures a project's ability to cover debt obligations in each period. It is calculated as CFADS (Cash Flow Available for Debt Service) divided by debt service (interest plus principal payments).
An ADSCR of 1.20x means the project generates 20% more cash than needed for debt payments. The ratio is calculated for each period in the debt tenor; the minimum ADSCR is typically the binding constraint for debt sizing.
CFADS (Cash Flow Available for Debt Service) is the project's cash flow after tax, working capital changes, and maintenance capex, but before financing. It differs from:
- NOI: Ignores taxes and capex; used in real estate
- EBITDA: Ignores taxes, working capital, and capex
CFADS is the appropriate numerator for project finance because it represents actual cash available to pay lenders after all operating and reinvestment needs.
Minimum ADSCR covenants vary by project type and risk profile:
- Contracted infrastructure (PPPs, regulated utilities): 1.10x to 1.20x
- Quasi-merchant projects: 1.20x to 1.30x
- Full merchant exposure: 1.30x to 1.50x or higher
Construction risk, revenue volatility, and sponsor creditworthiness also affect covenant levels.
Covenant breaches trigger remediation mechanisms specified in the credit agreement:
- Lock-up: Distributions to equity are blocked; cash is trapped to pay down debt
- Cash sweep: Excess cash is mandatorily applied to principal
- DSRA drawdown: The Debt Service Reserve Account may be tapped
- Event of default: If ADSCR falls below the default threshold, lenders may accelerate
Most agreements include cure periods allowing sponsors to inject equity or restructure before default.
Project finance uses three coverage ratios, each measuring different aspects:
- ADSCR: Period-by-period; CFADS[t] / Debt Service[t]. Identifies weak periods.
- LLCR: NPV of CFADS over remaining debt life / debt outstanding. Measures whole-loan coverage.
- PLCR: NPV of CFADS over remaining project life / debt outstanding. Includes tail cash after debt repayment.
ADSCR is typically the binding constraint for debt sizing because lenders require it to pass in every period. LLCR and PLCR are used to assess overall debt capacity and refinancing risk.
A project may have a comfortable average ADSCR (e.g., 1.50x) yet breach the covenant in one weak period (e.g., Year 3 at 1.08x during a maintenance shutdown). Lenders test every period because:
- A single breach can trigger default regardless of other periods
- Cash flows are not fungible across years without reserves
- The minimum ADSCR period is the debt-sizing constraint
Debt sculpting aims to create a level ADSCR profile across all periods, maximizing debt capacity by avoiding weak-period breaches.
Disclaimer
This calculator provides estimates for educational purposes only. Actual ADSCR requirements, covenant structures, and credit terms depend on the specific project, lender requirements, market conditions, and legal documentation. Always consult with qualified financial advisors, project finance bankers, and legal counsel for advice specific to your transaction.
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