Finance term
Tranching
Also known as: tranches, waterfall structure, senior/subordinate structure, payment waterfall
Definition
Tranching is the process of dividing a securitization pool's cash flows into layers (tranches) with different risk, yield, and priority — senior tranches receive payments first and absorb the least risk; equity/junior tranches receive payments last and absorb losses first.
Detailed explanation
Tranching is the core mechanism of structured finance. A pool of assets (mortgages, loans, receivables) generates uncertain cash flows — some borrowers may default. Tranching reorders those uncertain cash flows into more predictable layers by establishing a payment waterfall: senior investors get paid first from pool collections; subordinate investors get whatever remains after seniors are paid; equity investors absorb losses and receive residual upside.
Standard tranche stack in an ABS or CMBS deal: - **Senior (AAA–AA):** Highest priority claim on cash flows. First to receive principal and interest. Protected by all subordinate tranches as a credit buffer. Typically 70–85% of the deal. Lowest yield. - **Mezzanine (A–BBB-):** Middle-layer tranches. Receive payments after senior but before subordinate. Moderate credit risk, moderate yield. - **Subordinate / B-piece (BB–B):** First-loss layer for institutional credit investors. Below investment grade. Take losses before mezzanine and senior. - **Equity / Residual:** No credit rating. Receive residual cash after all bonds are paid. Absorb first losses dollar-for-dollar. Highest risk, highest potential yield (or total loss).
Transitioning between tranches is governed by triggers: performance tests (OC test = overcollateralization; IC test = interest coverage) that, if breached, redirect cash from junior to senior tranches until the test passes. This dynamic protection mechanism is why AAA-rated ABS tranches can maintain their rating even as a portion of the collateral pool defaults.
Tranching is also used outside securitization: VC deals tranche equity (liquidation preferences, participation rights) and some construction loans tranche draws by project milestone.
◈ Worked example
- A $100M CMBS deal: $75M AAA tranche (SOFR + 100bps), $10M A tranche, $8M BBB tranche, $4M BB tranche, $3M equity. If 5% of loans default with 50% recovery → $2.5M loss absorbed entirely by equity. Senior tranches unaffected.
- Overcollateralization trigger: If the pool's performing collateral balance falls below 108% of the outstanding senior notes, the deal diverts all excess interest from equity to pay down senior principal — protecting senior investors from collateral deterioration.
- Construction loan tranche: $3M hotel construction loan disbursed in milestones — $500K at land close, $1M at foundation, $1M at drywall, $500K at final certificate of occupancy. Each tranche requires third-party inspection approval.
Common questions
The most-asked questions about Tranching — answered straightforwardly.
Why do senior ABS tranches receive AAA ratings even when some collateral is risky? +
Because the subordinate tranches below the senior act as a credit buffer. If 10% of a pool defaults with 50% recovery (5% net loss), and the deal has 20% subordination below the senior, the senior tranche absorbs zero losses. The rating is based on how large the loss scenario would need to be to impair the senior — not the average expected loss of the pool.
What is a payment waterfall? +
The payment waterfall defines the exact order in which cash collected from pool assets is distributed. Typically: (1) trustee and servicer fees; (2) senior note interest; (3) senior note principal; (4) mezzanine interest; (5) mezzanine principal; (6) subordinate interest/principal; (7) equity/residual. If collections are insufficient, lower-priority recipients receive nothing until higher-priority claims are satisfied.
Further reading
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