The FDIC insures bank deposits up to $250,000 per person, per bank.

That promise is backed by a pool of money called the Deposit Insurance Fund.

Banks pay into the fund, and the fund pays out when a bank fails.

In March 2023, Silicon Valley Bank and Signature Bank failed within days.

Regulators covered even uninsured deposits under a systemic risk call.

That drained the fund, so the FDIC charged big banks a special assessment to refill it.

By 2025, the fund was rebuilding ahead of schedule.

The target is a reserve ratio of 1.35% of insured deposits, set by law.

The fund is not a giant vault. It holds a small share of all insured deposits.

The reserve ratio is the fund divided by insured deposits, near 1.35%.

That means about a penny and a third stands behind each insured dollar.

This works because failures are usually small and spread out.

When a bank fails, the FDIC sells it or its assets and covers the gap from the fund.

The fund is a buffer, not a full backstop for every dollar at once.

The first stress point is a cluster of large failures, like March 2023.

A few big banks failing together can outrun the fund's normal size.

The second is uninsured deposits. Many large-bank deposits sit above $250,000 and are not covered by the standard limit.

The third is speed. Digital banking let SVB lose tens of billions in hours, faster than old-style runs.

The fund can borrow from the Treasury if it runs short, and it has that line.

For everyday savers, the insurance holds. No insured depositor has lost money since the FDIC began in 1933.

That record is real and deserves confidence.

What can strain is the fund itself in a cluster of big failures, until assessments or Treasury loans refill it.

You can watch the gauges. The FDIC posts the fund balance and reserve ratio every quarter.

Its quarterly banking profile shows how many banks sit on its problem list.

Deposit insurance is a shared fund, thin by design, backed by the banks and, if needed, the Treasury.

For insured savers it has never failed, and the 2023 refill shows the system self-heals.

The next test is the next cluster of failures. Watch the reserve ratio against its 1.35% target.