Bottom line up front: a cash sweep account is how a startup gets millions of dollars of FDIC coverage even though FDIC only insures $250,000 per depositor per bank. The provider splits your deposit into sub-$250K pieces and spreads them across a network of many partner banks, so each piece sits under the limit at a different institution. That is the whole trick, and it works, but only if the accounts are titled and recorded correctly, and only if you understand that the coverage is “pass-through” insurance riding on other banks, not insurance on the fintech you signed up with. This page explains the mechanics the vendor marketing skips, because after March 2023 this is the part founders actually need to get right.

If you just want the practical account comparison, see Rho vs Mercury and Mercury vs Brex vs Ramp. If you want the full cash strategy, see where to park startup cash and the startup treasury management guide. This page is the mechanics.

Start with the number that never changes: $250,000

FDIC deposit insurance covers $250,000 per depositor, per insured bank, per ownership category. That is the standard limit in 2026, unchanged.

For a business that means: all the deposits your one entity holds at one bank, across checking and savings combined, are insured together up to $250K at that bank. Your business coverage is separate from the personal accounts of the founders. Open accounts at three different FDIC-insured banks and you get $250K at each, because the limit is per bank.

That last sentence is the entire principle a sweep network automates. If spreading money across banks gets you more coverage, then a service that spreads it for you automatically, while you deal with only one login, is valuable. That service is a deposit sweep network.

What a sweep network is

The two names you will see most are IntraFi’s ICS (Insured Cash Sweep) for demand-deposit and money-market balances, and CDARS for CD balances. IntraFi runs a network of thousands of member banks. Other providers run similar programs. The fintechs founders use (Mercury, Brex, Rho, Ramp) plug into networks like this behind the scenes.

Here is the mechanic, plainly:

1. You deposit, say, $3M with your provider.
2. The provider (or its partner bank) breaks that $3M into chunks each just under $250K.
3. Each chunk is placed at a different FDIC-insured bank in the network.
4. Because no single bank holds more than $250K of your money, every dollar sits under the per-bank limit and is FDIC-insured, at that receiving bank.
5. You still see one balance, one statement, one login. The splitting happens invisibly.

That is how a startup ends up with, for example, Mercury advertising up to ~$5M in coverage, Brex up to ~$6M across 24 partner banks, and Rho up to ~$75M across 400+ institutions. The bigger the network, the more chunks it can place, the higher the coverage ceiling.

Here is the picture from someone who moves large volumes of restricted cash across multiple institutions for a living. When a bank advertises more than $250K of FDIC coverage on a balance, what is really happening behind the glass is this: they are sweeping your funds out to partner institutions, and each account at each institution carries its own separate $250K of FDIC coverage. Your primary bank owns two jobs in that arrangement, maintaining the partner relationships and tracking exactly where every dollar of your money sits, while you keep full access to all of it. On the surface you are just banking normally at one place. Underneath, they are running the cash movement and the recordkeeping for you. That split, normal banking on top, constant reconciliation and movement underneath, is exactly the world I live in on the operations side of a loan servicer: payments come in, they get reconciled to the servicing ledger, then swept or distributed out to their rightful owners across accounts and institutions. A sweep network is that same machinery, pointed at your runway.

The word that matters: pass-through

Your money is not FDIC-insured at the fintech. It is insured at the receiving banks, and only through a doctrine called pass-through insurance. This distinction is the single most important thing on this page.

Pass-through coverage means: when a nominal depositor (the provider or its custodian bank) holds funds on behalf of the true owner (your startup), FDIC insurance “passes through” to you as the actual owner, as if you held the account directly at the receiving bank. But pass-through coverage is conditional. To qualify, per FDIC rules:

• The custodial or agency relationship must be expressly disclosed on the receiving bank’s account records.
• The records must identify the actual owners and their respective interests, maintained in accordance with FDIC recordkeeping requirements (the fiduciary / 12 CFR 330.5 and 330.7 framework).

Translation: coverage depends on paperwork you never see. If the titling and recordkeeping are done right, your money is insured at each receiving bank. Reputable networks like IntraFi are built precisely to satisfy these conditions, which is why the FDIC has confirmed ICS/CDARS deposits are eligible for pass-through coverage. But “eligible” is doing work in that sentence: the coverage lives or dies on correct account records, not on a marketing promise.

The trap almost nobody explains: aggregation

Here is the one that can quietly cost you. FDIC insurance is per depositor, per bank. If your sweep network places a chunk of your money at Bank X, and you separately, directly, hold money at Bank X, those two amounts are added together and insured only to $250K combined at Bank X. The sweep does not know about your other relationship. The insurance limit does.

For a startup with a few million spread across a large network, the odds of overlap on any one bank are small, but not zero, and they rise if you bank directly with a large institution that is also a common network member. This is exactly the kind of thing a treasury policy is supposed to catch, and exactly the kind of thing a content mill will never tell you.

The principle to hold onto is that the $250K limit is per depositor, meaning per legal owner of the account, not per account. Every balance your entity owns at a given bank stacks against the same single $250K limit at that bank, whether it arrived directly or got placed there by a sweep. For most startups spread across a large network this stays theoretical, but it stops being theoretical the moment you also hold a direct relationship at a big, common network bank. The practical move is not to obsess over it, it is to know which banks your sweep can place funds at, and to make sure your direct relationships are not silently doubling up on the same institution.

Counterparty reality: what you are actually trusting

Sweep coverage is real, but it moves the risk rather than deleting it. When you use a sweep account, you are trusting a chain:

• The receiving banks to be and stay FDIC-insured (they are, but you are now diffused across many of them).
• The intermediary (the fintech and its custodian/network) to keep accurate, current records of who owns what, because your pass-through coverage depends on those records existing and being right when a bank fails.
• The reconciliation to actually work on a bad day. FDIC pays out based on records provided after a failure. Coverage you cannot document quickly is coverage you are waiting on.

None of this is a reason to avoid sweeps. They are the correct tool for a cash-heavy startup. It is a reason to know that “up to $75M FDIC coverage” is a statement about a network and a recordkeeping process, not a single insurance policy stapled to your account.

There is also a second reason to run more than one banking relationship, separate from the insurance math. Speaking as someone who runs high-volume cash operations across multiple institutions, a sweep solves your coverage question but not your continuity question. If all your cash operations run through one institution and that institution freezes, your coverage may be intact while your ability to actually move money is not. Running at least two institutions for any given cash operation, and more as you scale, buys you the flexibility to divert operations to the other one the day you need to. Sweep coverage protects the dollars; a second live relationship protects your ability to use them.

One catch when you add the second relationship: make sure it is an actually unrelated institution. Two fintechs riding the same partner bank, or two accounts inside the same sweep network, is one point of failure wearing two logos. This is also why it matters to know which bank actually holds your deposits behind a neobank. The diversification and the coverage are only real if the money is genuinely sitting at different institutions, so find out who your provider’s partner bank is before you count it as a second leg.

The one diligence question I would not move real money without answering: who are the partner institutions the coverage actually flows through? A “$X million of FDIC coverage” claim is only as good as the banks on the other end of the sweep. Before I trusted that number, I would get the list of receiving institutions, then do my own due diligence on each one’s viability and legitimacy, the same way I would vet any counterparty I was about to route restricted funds through. The coverage figure is the headline; the partner banks are the actual thing you are trusting.

And this is not a read-only exercise. Networks like IntraFi let you actively exclude specific banks from receiving your funds, which is exactly how you kill the aggregation problem if you already bank directly somewhere on the list. Get the list, then use the opt-out.

What to diligence before trusting a coverage number

A practitioner checklist. Ask the provider, in writing, before you move real money:

1. Which network powers the sweep? (IntraFi ICS/CDARS, or a proprietary program.) A named, established network is a good sign.
2. How many receiving banks, and can you get the list or opt out of specific banks? Opt-out matters if you already bank directly somewhere on the list (see the aggregation trap above).
3. Who holds the recordkeeping obligation, and is it FDIC pass-through compliant? This is what your coverage rests on.
4. What is the stated maximum coverage, and what happens to balances above it? Anything over the ceiling is uninsured, sitting in a money-market fund (SIPC, not FDIC), or in plain deposits at $250K each. Know which.
5. Is the yield product a deposit or a fund? Sweep deposit balances are FDIC pass-through. A treasury / money-market fund is SIPC-covered, not FDIC-insured. Providers offer both and the words look similar. See where to park startup cash.

FDIC vs SIPC, since sweeps blur it

Because providers put “FDIC sweep” and “treasury yield” on the same dashboard, founders conflate two different protections. Keep them separate:

SIPC does not protect against a money-market fund losing value; it protects against your brokerage failing while holding your securities. A government money-market fund is very safe, but it is not an insured deposit. If a marketing page implies your treasury yield is “FDIC-protected,” that is the tell that you should read the fine print yourself.

The honest caveat

Coverage ceilings, partner-bank counts, and which specific product is a deposit versus a fund all change, and providers revise their sweep networks without fanfare. The $250K per-bank FDIC limit and the pass-through recordkeeping conditions are stable; the provider-specific numbers are not. Confirm the live figures and the current network on the provider’s own disclosure before you move money, and if a multi-million coverage claim matters to your board, ask the diligence questions above and get the answers in writing. Some links here are affiliate links; they never change what this page tells you, because a comparison you cannot trust on exactly this kind of detail is worthless.

Disclosure: some links on this page are affiliate links. See our methodology and disclosures.