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FRM Exam Part I · Banks

Originate-to-Distribute Model and Securitization Explained

Updated 11 October 2026 · Fact-checked

In the originate-to-distribute (OTD) model, a bank makes loans, pools them, and sells them to investors through securitization instead of holding them. This moves credit risk off the bank's balance sheet and frees capital. It can also weaken lending standards, because the bank no longer bears the loss.

Understand Originate-to-Distribute Model and Securitization

In the originate-to-hold model, a bank lends money and keeps the loan until it is repaid. The bank earns interest, bears any default loss, and so has a strong reason to check the borrower carefully.

In the originate-to-distribute (OTD) model, the bank makes the loan and then sells it. Many loans are pooled and transferred to a special purpose vehicle (SPV). The SPV issues securities to investors, and the cash from investors pays the bank. The bank earns origination and servicing fees and can lend again. This process is securitization.

The pool's cash flows are usually split into tranches. Senior tranches are paid first and bear losses last. Mezzanine tranches sit in the middle. The equity (first-loss) tranche absorbs losses first and pays the highest return. Credit rating agencies rate the tranches, and many senior tranches received AAA ratings.

The benefits are real: more funding sources, capital relief, risk spread across investors, and lower borrowing costs. The danger is the incentive problem. If the bank earns fees on volume and passes on the default risk, it has less reason to screen borrowers. This is a moral hazard problem. Investors also face asymmetric information, since they know less about the loans than the originator.

Before the 2007-2008 crisis, this model helped fuel growth in US subprime mortgage lending. Lending standards fell, loans were packaged into mortgage-backed securities and then into CDOs, and complex structures hid the risk. When house prices fell and defaults rose, losses hit even senior tranches, and investors lost trust in the ratings. Banks also kept exposure through warehoused loans, retained tranches, and support for off-balance-sheet vehicles, so risk did not leave the system as hoped. Later reforms, such as risk retention ("skin in the game") rules, aim to realign incentives.

Key formulas to remember

Tranche loss allocation
Loss to a tranche = min(max(Pool loss − Attachment point, 0), Detachment point − Attachment point)
Losses hit the lowest tranche first. Attachment and detachment points are in the same units as the pool loss, such as % of pool or a currency amount.
Pool loss
Pool loss = Pool balance × Default rate × (1 − Recovery rate)
Use this to get the loss in currency before applying it to tranches. The recovery rate is the fraction recovered on defaulted loans.
Tranche thickness
Thickness = Detachment point − Attachment point
A thin tranche can be wiped out by a small change in pool loss, so it is highly sensitive to default risk.
Credit enhancement (subordination)
Subordination below a tranche = Attachment point of that tranche
The attachment point is the loss the pool can take before this tranche loses anything.

How to solve Originate-to-Distribute Model and Securitization questions

Conceptual questions test incentives and risks. Numerical ones test how losses flow through tranches. Use this order for either.

  1. 1Identify whether the question is about the model (OTD vs originate-to-hold), the structure (SPV, tranches), or the crisis link.
  2. 2For concept questions, ask who bears the credit loss and who has the information. That points to the incentive effect.
  3. 3For numerical questions, list the tranches from the most junior to the most senior with their attachment and detachment points.
  4. 4Compute the pool loss in currency or percent, using default rate and recovery rate if given.
  5. 5Allocate the loss to the equity tranche first, then mezzanine, then senior, capping each at its thickness.
  6. 6Check that total tranche losses equal the pool loss and no tranche exceeds its size.
  7. 7Match the result to the options, watching for units (percent of pool vs percent of tranche).

Quickest way: Waterfall shortcut

When to use it: Use when a question gives tranche sizes and a pool loss and asks which tranches lose money or how much.

  1. Write tranche sizes bottom to top.
  2. Subtract the pool loss from the bottom, wiping out tranches one at a time.
  3. Whatever remains of the loss after a tranche is full moves up to the next one.
  4. For concept questions, eliminate options that say the bank bears more risk after selling the loans, or that securitization removes all risk.

Common mistakes in Originate-to-Distribute Model and Securitization

  • Saying securitization eliminates the bank's credit risk.

    The loans leave the balance sheet, so it looks like the risk left too.

    Fix: Remember banks often kept residual tranches, liquidity support, warehoused loans and reputational exposure, so some risk stayed.

  • Applying losses to the senior tranche first.

    Confusing payment priority with loss priority.

    Fix: Senior is paid first and loses last. Equity loses first.

  • Mixing percent of pool with percent of tranche.

    Attachment points are quoted in pool terms while a loss on a tranche is judged in its own size.

    Fix: Convert everything to currency amounts, then to percent of the tranche if needed.

  • Ignoring the recovery rate when computing pool loss.

    Treating default as total loss.

    Fix: Multiply defaulted balance by (1 − recovery rate).

  • Blaming the crisis only on rating agencies or only on banks.

    Seeking a single cause.

    Fix: Cite several: weak underwriting from poor incentives, complex structures, ratings reliance, leverage, and information gaps.

Worked examples

Example 1

A pool of ₹1,000 crore of loans is securitized into three tranches: equity 0%-5%, mezzanine 5%-20%, senior 20%-100% of the pool. The default rate is 18% and the recovery rate is 50%. What is the loss to the mezzanine tranche in ₹ crore and as a percentage of that tranche?

Show the solution
  1. Pool loss = 1,000 × 18% × (1 − 50%) = 1,000 × 0.18 × 0.5 = ₹90 crore, which is 9% of the pool.
  2. Equity tranche covers 0% to 5%, so it absorbs 5% of the pool = ₹50 crore and is wiped out.
  3. Remaining loss = 9% − 5% = 4% of the pool = ₹40 crore.
  4. Mezzanine thickness = 20% − 5% = 15% of the pool = ₹150 crore. Its loss is 4%, below the 15% thickness, so it is not wiped out.
  5. Mezzanine loss as a percent of the tranche = 4 ÷ 15 = 26.67%.

Answer: Mezzanine loses ₹40 crore, about 26.67% of the tranche. The senior tranche takes no loss.

Example 2

Which statement best describes why the originate-to-distribute model weakened lending standards before 2007? (A) Banks held all loans to maturity and ignored borrower quality. (B) Banks earned fees on volume and passed credit losses to investors, reducing their incentive to screen borrowers. (C) Regulators required lower underwriting standards. (D) Investors had better information about the loans than the banks.

Show the solution
  1. Identify the issue as incentives: who bears the loss.
  2. Option A describes originate-to-hold, not OTD, so it is wrong.
  3. Option C is not a feature of the model and is unsupported.
  4. Option D reverses the information asymmetry. The originator knows more than the investors.
  5. Option B states moral hazard: fee income from volume with the loss transferred.

Answer: B

Exam tips

  • Expect questions that ask who bears the risk and why incentives change. Answer with moral hazard and asymmetric information.
  • For tranche questions, always start the loss at the equity tranche and move up.
  • Know the crisis chain: weak underwriting, securitization into MBS and CDOs, rating reliance, house price fall, losses, loss of trust.
  • Remember reforms such as risk retention are meant to restore the originator's incentive to screen.
  • Watch for absolute words like "eliminates" or "always" in options. They are usually wrong.

Practice questions from Banks

Originate-to-Distribute Model and Securitization in other exams

The same ground in other exams, if you are preparing for more than one or want another angle on it.

Originate-to-Distribute Model and Securitization: frequently asked questions

What is the difference between originate-to-hold and originate-to-distribute?

In originate-to-hold, the bank keeps the loan and bears its default risk. In originate-to-distribute, the bank sells the loan, usually through securitization, and passes most credit risk to investors. This changes the bank's incentive to screen borrowers.

How does securitization work in a bank?

The bank pools loans and sells them to an SPV. The SPV issues tranched securities to investors and uses the loan payments to pay them. Senior tranches are paid first and equity absorbs losses first.

How did the originate-to-distribute model contribute to the subprime crisis?

It rewarded lenders for volume rather than loan quality, so standards fell. Risky mortgages were packaged into complex securities and rated highly. When defaults rose, losses spread widely and confidence collapsed.

Why do regulators want originators to retain some risk?

If the originator keeps a share of the loss, it has a reason to underwrite carefully. This is often called skin in the game and it addresses the moral hazard in the OTD model.