What is a sweep account?
How sweep accounts work, what banks actually pay, and where insured cash sweep programs fall short.
Reference guide · Reviewed September 2026 · Next review October 2026
The short version
- A sweep account is not an account. It is an instruction attached to one: move everything above a target balance out at the daily cutoff, and move it back before it is needed.
- Five structures are sold under the same word — bank deposit, money market fund, insured cash, repo, line-of-credit — and what you own once the money has moved differs in every one of them.
- Sweep pricing is negotiated per relationship and is not on a public rate sheet. Every third-party rate on this page stays marked “To be sourced” until it has been read at the source and dated.
- Most of the gap between the quoted rate and the interest that lands in your account is structure, not fees: the peg, the tier boundary, the spread, the earnings credit you never spend.
- A sweep is built for cash you may need tomorrow morning. Reserves untouched for two quarters are paying for liquidity they never use — that is the tranche worth allocating elsewhere.
Definition and mechanism.
A sweep account is not an account. It is an instruction attached to one: move everything above a target balance somewhere it earns, at the end of every business day, and move it back before it is needed.
A target balance is set
You and the bank agree on a peg — the amount the operating account should hold at the end of each business day. It is usually sized on your payroll, tax and payables calendar, not on your total cash.
The excess is swept out at cutoff
After the day’s posting cutoff, anything above the peg is moved automatically into the destination vehicle: a savings account, a money market fund, a reciprocal deposit network or a repurchase agreement, depending on the program you signed.
It sweeps back the next morning
When the account falls below the peg, the program reverses the transfer to cover clearing items. The cash is never idle on paper, and it is never available to you any faster than the destination vehicle settles.
Why the mechanism exists at all
For most of the twentieth century, US banks were prohibited from paying interest on business demand deposits. The sweep was the workaround: leave the checking balance at zero interest, and move the surplus into something that could legally pay. The prohibition was repealed in 2011, but the plumbing stayed, because it had become how corporate cash management was sold. That history matters when you read your rate. A sweep was designed to solve a regulatory problem, not to maximize your yield — and the pricing still reflects that origin.
The types: bank, money market, insured.
Five structures are sold under the same word. They differ on one question that matters more than the rate: what exactly do you own once the money has moved?
The simplest arrangement and the most common. Balances move between two accounts at one institution. Operationally invisible, but the rate is set unilaterally by the bank and the balance still counts as a claim on that single bank.
- Where the cash goes: Savings or money market deposit account at the same bank
- Insurance status: FDIC insured, up to $250,000 per depositor, per bank, per ownership category
- Settlement: Same day, internal book transfer
The cash leaves the bank’s balance sheet and buys shares in a fund holding Treasury bills, repo and agency paper. Yield is quoted as a 7-day net yield, already net of the fund’s expense ratio. Credit risk moves from one bank to a diversified portfolio of short government paper.
- Where the cash goes: A registered money market fund, usually a government fund
- Insurance status: Not a deposit and not FDIC insured — you own fund shares
- Settlement: Redemption typically settles same or next business day
Your deposit is broken into pieces placed at other member banks, each piece staying under the insurance limit, while your relationship stays with one bank. It buys insured capacity well beyond a single charter — and it costs yield, because the network and the placing bank both take a share.
- Where the cash goes: A reciprocal network that splits the balance across many banks
- Insurance status: Pass-through FDIC coverage in increments under $250,000, subject to correct account titling and recordkeeping
- Settlement: Generally next business day
Legacy structures still offered to larger commercial clients. A repo sweep gives you a secured claim against government collateral rather than deposit insurance. An offshore or Eurodollar sweep books the balance outside US deposit insurance altogether.
- Where the cash goes: Overnight repurchase agreements or a foreign branch deposit
- Insurance status: Collateralized rather than insured, or outside FDIC coverage entirely
- Settlement: Overnight, reversing at open
Excess cash pays down borrowings instead of earning interest. If your borrowing rate is above any deposit rate you can get, this is usually the highest-return sweep available. It is also the one that leaves you with nothing to allocate.
- Where the cash goes: The outstanding balance of your revolver
- Insurance status: Not applicable — no balance is held
- Settlement: Same day
If you are choosing between a deposit account and a fund, the trade-off is set out on the money market comparison.
What programs actually pay in 2026.
Sweep rates are rarely published. They are quoted in a treasury management proposal, revised without notice, and vary by relationship. We record them only once we have read them at the source — until then, the cell says so.
| Program type | Yield measured as | Rate | Balance required | Verified on |
|---|---|---|---|---|
| National bank deposit sweep | Internal savings / MMDA | To be sourced | To be sourced | To be sourced |
| Regional bank deposit sweep | Internal savings / MMDA | To be sourced | To be sourced | To be sourced |
| Government money market fund sweep | 7-day net yield | To be sourced | To be sourced | To be sourced |
| Reciprocal insured cash sweep | Network deposit placement | To be sourced | To be sourced | To be sourced |
| Brokerage cash sweep | Bank deposit program | To be sourced | To be sourced | To be sourced |
| Coinstancy Pro | Contractual APY, no lock tier | 6.00% | USD or USDC, KYB before first deposit | September 2026 |
Why the table has empty cells
Publishing a sweep rate we have not verified would make this page useless to the person who needs it. Bank sweep pricing is negotiated per relationship and is not on a public rate sheet, so a number scraped from an aggregator would be an average of contracts that are not yours. Each cell is filled only after the rate has been read at the source and dated. The method is the same one used on the rate barometer.
Where to find your own number
Your account analysis statement is the only authoritative source for what your sweep pays. It shows the balance swept, the rate applied, the earnings credit generated and the fees charged against it. Pull three consecutive months, divide interest earned by average swept balance, and annualize. That figure — not the one in the proposal — is your real sweep yield.
The limits of insured cash sweep.
Reciprocal deposit networks solve a real problem — insured capacity above one charter — and they are widely used for good reason. They also carry conditions that are easy to read as guarantees when they are not.
What it genuinely delivers
What it does not
The failure mode nobody diligences
FDIC insurance pays out when an insured bank fails. It does not pay out when the entity holding the record of who owns what stops functioning. In a pass-through arrangement, coverage depends on the account being titled in a custodial capacity and on records that identify each beneficial owner and their share. Where an intermediary sits between the depositor and the member banks, those records are that intermediary’s responsibility.
The 2024 collapse of a US banking-as-a-service intermediary made the point concretely: the underlying banks did not fail, so deposit insurance was never triggered, and end customers still waited on a ledger reconciliation to learn what they were owed. Ask your provider three questions in writing — who maintains the beneficial ownership records, how often they are reconciled to the member banks, and what happens to your access if the administrator stops operating. A satisfactory answer is specific.
Coinstancy Pro is explicit on the same question: it is not FDIC insured. Eligible funds are covered through OpenCover for specific protocol events, up to 100% of their USD value and subject to policy terms, limits and exclusions — the coverage page lists what is excluded.
Non-bank alternatives.
None of these replaces a sweep. They compete for a different tranche of cash: the reserve that has not moved in two quarters and is currently being paid an overnight rate for overnight liquidity it never uses.
Treasury bills, bought directly
The reference every other option should be judged against. It requires a brokerage relationship and someone to run the ladder, and it locks the term you choose unless you sell.
- Where the yield comes from
- The front end of the government curve
- Access
- Held to maturity, or sold at market price before it
- What you are exposed to
- No credit risk if held to maturity; price risk if sold early
Government money market funds
The default non-bank home for operating reserves. Diversified, transparent, and boring in the way a treasury instrument should be.
- Where the yield comes from
- Short government paper and repo, net of the expense ratio
- Access
- Redemption typically same or next business day
- What you are exposed to
- Not a deposit, not FDIC insured, no smart contract exposure
Covered stablecoin savings
What Coinstancy Pro does: USD or USDC deposits, 6.00% APY with no lock and 6.75% at twelve months, deployed across protocols we review and monitor. It is a reserve allocation, not an operating account, and the risks it carries are not the risks a bank deposit carries.
- Where the yield comes from
- Lending and liquidity provision on reviewed DeFi protocols
- Access
- Withdrawals available within 48 hours
- What you are exposed to
- Not FDIC insured. Covered through OpenCover for specific protocol events only
Keep this in the sweep
This tranche can go further out
Coinstancy Pro sits in the third column: USD or USDC only, 6.00% APY with no lock, 6.75% at twelve months, withdrawals within 48 hours, KYB before the first deposit, and no deposit insurance of any kind. If your treasury policy bars smart contract exposure, the first two columns are your answer. See how it sits next to a sweep.
Frequently asked questions
An automated arrangement that moves cash above a set balance out of your operating account at the end of each business day into an interest-bearing or investment vehicle, and moves it back when the operating account needs it.
It depends entirely on where the cash is swept. A bank deposit sweep stays in insured deposits, subject to the $250,000 limit per depositor, per bank, per ownership category. An insured cash sweep uses a reciprocal network to multiply that capacity, subject to correct titling and recordkeeping. A money market fund sweep or a repo sweep is not FDIC insured at all — you hold shares or a collateralized claim, not a deposit.
Because the sweep rate is a price the bank sets, not a market rate you receive. The institution earns on the same balance and passes through a portion. On an insured cash sweep, the network takes a share as well. Neither spread is itemized on your statement.
No. It extends coverage by splitting your balance into increments under $250,000 across member banks, but every program has an aggregate cap, and balances you already hold at a member bank can reduce the coverage a placement actually delivers. Above the cap, the excess is an uninsured deposit like any other.
It is different, not strictly safer. A government fund replaces a concentrated claim on one bank with a diversified portfolio of short government paper, which removes single-institution failure risk. In exchange you give up deposit insurance, and the fund’s yield and its fee waivers can both change without notice.
A sweep is built for cash that has to be available tomorrow morning. Reserves you have not touched in two quarters are paying for liquidity they never use. Splitting the two — operating cash in the sweep, reserves in a longer instrument — is usually where the yield is, and it is the decision the treasury management guide works through.
It is not a substitute for one. Coinstancy Pro takes USD or USDC, pays 6.00% APY with no lock-up and up to 6.75% at twelve months, and settles withdrawals within 48 hours after a one-time KYB. It is not FDIC insured; eligible funds are covered through OpenCover for specific protocol events, subject to policy terms, limits and exclusions. Keep the operating float in the sweep and allocate only the reserve.
Keep the sweep. Allocate the reserve.
Open an account directly. If your finance team needs the coverage terms and the KYB requirements before that, a call is the faster route.