When you take out a car loan, the lender often does not keep it.

It bundles thousands of loans and sells them as bonds, called asset-backed securities.

Investors buy slices of those bonds and collect your payments. That chain is securitization.

Subprime borrowers fell behind at a record pace in early 2025.

In auto bonds, the share of subprime loans 60 days late hit about 6.9% in January, a record.

Even so, investors kept buying. Auto ABS issuance topped $120 billion in 2025.

Auto bonds made up about a third of all new asset-backed issuance.

So demand rose even as the weakest borrowers strained.

A lender pools many car loans into one trust.

The trust issues bonds in slices, from safest to riskiest.

The top slice gets paid first and carries the highest rating.

Lower slices get paid last and absorb the first losses.

As long as most drivers pay, the cash flows up and every slice is fine.

The lower slices are the shock absorber that protects the top.

The first stress point is the bottom slices. Rising defaults eat them first.

If losses run past those slices, they climb into the higher ones.

The second is the subprime pool. Weaker borrowers default sooner and harder.

The third is the lender itself. If it fails, new loans stop and its bonds lose their servicer.

A record subprime delinquency rate is the gauge flashing on the bottom slices.

Prime auto bonds have held up well, and their top slices rarely take losses.

The slice structure has worked through many cycles, and it deserves credit.

What can break is a subprime pool in a downturn, where losses chew through the lower slices fast.

You can watch the data. Rating firms publish delinquency and loss rates on auto bonds each month.

A rising 60-day late rate is the clearest early warning.

Securitization turns your car loan into a sliced bond, with the weak slices guarding the strong.

Prime deals are sound; the strain sits in subprime, where late payments hit a record in 2025.

The next test is whether jobs and wages hold. Watch subprime auto delinquency rates each month.