Key Takeaways
- SLABS are bonds backed by pools of US student loans, paid from borrower repayments and split into tranches of different risk.
- There are three main types: government-guaranteed FFELP deals, private in-school loan deals and refinance loan deals, each with a different risk.
- Private student loans totalled about $144.9bn at the start of 2025, roughly 8% of US student debt, which sits at $1.65tn overall.
- Private student loans are hard, though not impossible, to discharge in bankruptcy, and that legal protection is narrower than often claimed.
- New federal borrowing caps from July 2026 are expected to push more graduate lending to private lenders and lift private SLABS supply.
When investors think of asset-backed securities, mortgages, car loans and credit cards usually come first. Student loans are the less familiar relation, though the US market behind them is enormous. Americans owe $1.65 trillion in student debt, according to the New York Fed, more than they owe on credit cards.
Student loan asset-backed securities, or SLABS, turn part of that debt into bonds. They offer contractual cash flows, tranches for different risk appetites and exposure to a borrower base whose repayment habits are well documented. They also carry risks that are easy to misread, from slow-moving prepayment and extension risk to policy changes in Washington.
This guide explains what SLABS are, the main types, how they are structured, where the risks lie and what the 2025–2026 changes to federal lending mean for supply.
What are student loan asset-backed securities?
SLABS are a form of asset-backed security created by pooling student loans and selling them to a separate trust, which issues notes to investors. Borrower repayments of principal and interest flow through the trust to noteholders in a set order.
The lender that made the loans usually keeps servicing them, collecting payments and handling arrears, and often retains the riskiest slice of the deal. Issuers include specialist student lenders such as Sallie Mae, Navient and Nelnet, refinance lenders such as SoFi, and newer non-bank lenders.
The market is older and deeper than many investors assume. Morningstar DBRS counts 773 student loan securitisations since 1988, with more than $655bn issued through the first quarter of 2026.
The three main types of SLABS
A common misconception is that SLABS contain only private student loans. In fact the market has three distinct parts.
| Type | Collateral | Main protection | Main risk |
|---|---|---|---|
| FFELP SLABS | Legacy federal loans made before 2010 | Federal guarantee of typically 97–98% of principal and interest | Extension: loans repay more slowly than the bonds assume |
| Private in-school SLABS | Loans to current students, usually with a co-signer | Co-signers, credit underwriting, excess spread | Defaults and deferment periods |
| Refinance SLABS | Loans to graduates refinancing existing student debt | Strong borrower credit: employed, often high earners | Prepayment, and a refinance market that moves with rates |
FFELP loans were made by private lenders under a federal guarantee until the programme stopped new lending in 2010. The remaining stock is shrinking but still traded, and its main risk is timing. Income-driven repayment, forbearance and deferment can stretch repayment beyond a bond's legal final maturity, a problem that led rating agencies to review many FFELP deals in the mid-2010s.
Private and refinance SLABS carry no government guarantee. Their protection comes from underwriting, co-signers, subordination and excess spread, and they are rated and priced accordingly.
How SLABS are structured
SLABS follow the standard securitisation template. The loans sit in a bankruptcy-remote trust, separate from the originator. The trust issues several classes of notes, paid in order of seniority.
- Senior tranches: paid first, protected by the tranches beneath them, and offering the lowest yield.
- Subordinate tranches: paid after the seniors and absorbing losses first, with a higher yield in return.
- Residual or equity: whatever is left after all notes are paid, usually retained by the originator.
Credit enhancement also comes from overcollateralisation, where the loan pool exceeds the notes issued, reserve accounts and excess spread: the gap between interest paid by borrowers and interest owed to noteholders. Our guide to the capital stack explains how position determines risk.
The investor case for SLABS
Long, documented cash flows. Student loans have long repayment schedules and decades of performance data, which allow investors to model defaults and prepayments with reasonable confidence.
Strong borrower profiles in private deals. Private in-school loans are largely co-signed, and refinance loans go to employed graduates with established credit. Both tend to perform better than general unsecured consumer credit.
Yield over comparable bonds. Subordinate tranches of private and refinance deals offer spreads above many public fixed income securities of similar rating, partly reflecting the complexity of the asset.
Limited dischargeability. Under US bankruptcy law, qualified education loans can only be discharged if the borrower proves "undue hardship", a high bar. That makes student loans harder to escape than most consumer debt. The protection is narrower than often claimed, however. In 2021 the US Court of Appeals for the Second Circuit held that certain private loans that do not meet the statutory definition can be discharged, and investors should check which loans in a pool qualify.
Risks to consider
- Default risk: borrower defaults reduce cash flows, hitting subordinate tranches first.
- Prepayment risk: refinance waves, especially when rates fall, return principal early and cut the expected yield on bonds bought above par.
- Extension risk: forbearance, deferment and income-driven plans slow repayment, a particular issue for FFELP deals.
- Economic sensitivity: rising graduate unemployment or a weak labour market depresses repayment.
- Policy and conduct risk: changes to federal programmes, servicing rules or borrower protections can alter behaviour across the whole market.
How US policy changes are reshaping SLABS supply
The One Big Beautiful Bill Act, signed in July 2025, ends the Grad PLUS programme for new graduate borrowers from 1 July 2026 and caps federal Parent PLUS and graduate lending. KBRA estimates a structural funding gap of about $10–12bn a year in graduate education and describes the change as a tailwind for student loan ABS supply, while cautioning that displaced federal borrowing will not convert one for one into private loans.
Private lending is starting from a modest base. Protect Borrowers (formerly the Student Borrower Protection Center) puts private student debt at about $144.9bn at the start of 2025, around 8% of the total. If even part of the federal gap moves to private lenders, more loans will need funding, and securitisation is the main way specialist lenders fund growth. Investors should watch underwriting standards closely as volumes rise.
Two caveats apply. First, the size of the gap is still moving: in June 2026 a federal court stayed the Department of Education's narrow definition of a "professional degree", which widens the number of programmes eligible for the higher $50,000 annual federal limit while the case continues. Second, private lenders underwrite on credit, so borrowers with thin or weak credit files will not all find a private loan. We track the wider policy picture in our analysis of US student loan policy in 2026.
Beyond new issuance: distressed student loans
Performing SLABS are one way into the asset class. Another is buying delinquent and defaulted private student loans, a form of non-performing loan investing. These loans trade at deep discounts in the secondary market and are bought by specialist recovery firms. One example is Alt Lending, a US business that acquires delinquent and defaulted private student loans and works with specialist servicers such as Zuntafi to return them to regular payment. Kingsbury & Partners has partnered with Alt Lending through two senior secured facilities. This is a very different risk from rated SLABS, with returns driven by recovery rather than contractual coupons, and it is covered in our guide to investing in distressed private student loans.
What this means for investors
SLABS give allocators access to a large, data-rich consumer credit market through familiar securitisation structures. The type of SLABS matters more than the label: FFELP deals are about timing risk under a government guarantee, private in-school deals about co-signed credit risk, and refinance deals about prepayment and the rate cycle.
For family offices and wealth managers, the practical points are to know which type you own, to understand where your tranche sits, to test the bankruptcy and policy assumptions rather than take them on trust, and to treat the coming growth in private lending as a reason for closer diligence. For the wider asset class, see our guide to private student loans in private credit.
Frequently Asked Questions
What are SLABS?
SLABS are asset-backed securities backed by pools of student loans. Investors receive payments from borrowers' principal and interest through a trust, in order of seniority.
Are SLABS backed by the government?
Only FFELP SLABS, which hold legacy federal loans guaranteed at typically 97–98% of principal and interest. Private and refinance SLABS carry no government guarantee.
Can student loans in SLABS be discharged in bankruptcy?
Qualified education loans can be discharged only if the borrower proves undue hardship, which is rare. Some private loans that fall outside the legal definition have been held dischargeable, so pool composition matters.
Who issues SLABS?
Specialist student lenders such as Sallie Mae, Navient and Nelnet, refinance lenders such as SoFi, and other bank and non-bank lenders that use securitisation to fund their loan books.
What are the main risks of SLABS?
Defaults, early repayment through refinancing, slower repayment through forbearance and income-driven plans, economic weakness and changes in US student loan policy.
How will federal loan caps affect SLABS?
Ending Grad PLUS and capping federal loans from July 2026 is expected to shift some graduate borrowing to private lenders, which should increase private SLABS issuance over time.
