In banking, RTGS stands for real-time gross settlement: a system in which payments between banks are processed one at a time, for their full amount, the moment the instruction arrives. In the United States, the Federal Reserve’s Fedwire Funds Service is the primary RTGS system, moving trillions of dollars between banks each business day. Every transfer that clears is immediate, final, and irrevocable, which is what makes RTGS the backbone of high-value banking and also what makes mistakes so hard to undo.1Federal Reserve Board. Fedwire Funds Services
Breaking Down the Two Halves of the Term
The name is doing real work. Each half describes a specific choice about how payments are handled, and together they explain why RTGS behaves the way it does.
“Real-time” means the payment processes the moment the instruction arrives. There is no waiting period, no overnight batch, no accumulation of transactions before anything moves. When the Federal Reserve Bank receives a valid transfer order, it executes immediately.
“Gross settlement” means each transfer is handled on its own, for its full amount. The alternative, used by many lower-value payment networks, is net settlement: the system tallies up all the payments between two banks over a period, offsets them against each other, and moves only the difference. Gross settlement skips that math. If Bank A owes Bank B $50 million and Bank B separately owes Bank A $30 million, an RTGS system processes two separate transfers of $50 million and $30 million rather than a single $20 million net payment.
Put those two ideas together and you get the defining feature of RTGS: once a Fedwire transfer goes through, the money belongs to the receiving bank, in full, right away. The Federal Reserve debits the sending bank’s master account and credits the receiving bank’s master account, and that ledger entry is the legal transfer of funds.1Federal Reserve Board. Fedwire Funds Services No later event unwinds it through the payment system itself.
How a Transfer Actually Moves
The process starts when the sending bank receives an instruction from its customer and creates an electronic payment order. That order goes to the Federal Reserve Bank, which sits in the middle of every transaction. The Fed holds a master account for every participating bank, and those accounts together form the single ledger where ownership of money changes hands.
When the payment order arrives, the Federal Reserve debits the sending bank’s master account and credits the receiving bank’s master account.1Federal Reserve Board. Fedwire Funds Services That entry is the settlement. The receiving bank then identifies the intended beneficiary from the account details in the payment message and posts the funds to that customer’s account.
The whole cycle typically takes minutes. Because the Fed is the counterparty to both sides, neither bank has to trust the other directly. The central bank’s ledger is the authoritative record of who owns what.
When RTGS Is Used
RTGS exists for situations where speed and certainty matter more than cost. The transactions that flow through Fedwire share a common feature: the parties can’t afford settlement risk.
- Interbank transfers. Banks move large sums between each other throughout the day to meet reserve requirements, cover overnight lending obligations, and manage liquidity.
- Corporate acquisitions and real estate closings. When a company buys another company or a commercial property changes hands, the funds have to arrive with certainty. A wire provides that where a check or ACH batch would not.
- Securities settlement. The cash leg of a bond or securities trade often settles through Fedwire so that neither side delivers value while the other side’s payment is still pending.
- Money market transactions. Short-term interbank lending, including overnight federal funds trades, relies on RTGS for same-day finality.
Fedwire has no published minimum transaction amount.2eCFR. 12 CFR Part 210 Subpart B – Funds Transfers Through the Fedwire Funds Service In practice, the fees and complexity make it impractical for everyday personal payments. The system is built for institutions and for individuals making major financial moves, like closing on a home.
Fedwire runs Monday through Friday on an extended schedule, currently 22 hours per business day. It is closed on weekends and Federal Reserve holidays.3Federal Register. Federal Reserve Action To Expand Fedwire Funds Service and National Settlement Service Operating Hours A wire initiated late on a Friday will not settle until the next business day.
Why RTGS Transfers Are Nearly Impossible to Reverse
The finality that makes RTGS trustworthy also makes it unforgiving. Once the Federal Reserve processes a Fedwire transfer, no party can unilaterally cancel or reverse it through the payment system.1Federal Reserve Board. Fedwire Funds Services Wire transfers are governed by Article 4A of the Uniform Commercial Code, which sets out specific responsibilities for both senders and banks.
If a payment order contains an error, such as the wrong beneficiary or a duplicated instruction, the sender’s bank can try to recover the funds, but only if the bank followed the agreed-upon security procedures for detecting errors. Article 4A gives the sender 90 days from the bank’s notification to discover and report an erroneous transfer. Miss that window, and the sender bears liability for any loss the bank can prove resulted from the delay.4Legal Information Institute. UCC 4A-205 – Erroneous Payment Orders
When a funds transfer fails to reach the intended beneficiary because an intermediary bank fails or the transfer cannot be completed, Article 4A does protect the sender: the sending bank’s obligation to pay is excused, and any bank that already moved money is entitled to a refund back through the chain.5eCFR. Appendix A to Part 210 – Article 4A, Funds Transfers Those protections hinge on technical failures inside the banking system, not on a sender who changed their mind or fell for a scam.
This is why wire fraud is so devastating. Once a victim authorizes a transfer, the money moves within minutes and is often forwarded through additional accounts or converted to cryptocurrency before anyone realizes what happened. The FBI’s Internet Crime Complaint Center has tracked over $55 billion in global losses from business email compromise schemes alone between 2013 and 2023, and the bulk of those losses involved wire transfers. If someone is pressuring you to wire money urgently, the urgency itself is the warning sign. Check every digit of the account number and routing information before authorizing, because there is no automated recall the way there is with an ACH payment or a check.
How Fedwire Compares to FedNow and RTP
Fedwire is no longer the only real-time settlement system in the United States. The Federal Reserve launched the FedNow Service in 2023, and as of March 2026, over 1,660 financial institutions participate.6Federal Reserve Financial Services. FedNow Participating Financial Institutions The key difference is availability. FedNow operates 24 hours a day, 7 days a week, 365 days a year, with no interruption between business days.7Federal Reserve Financial Services. FedNow Service Operating Hours
FedNow was originally designed for lower-value instant payments, but its ceiling has grown quickly. As of November 2025, the network limit increased from $1 million to $10 million per transfer, opening it up for higher-value business use.8Federal Reserve Financial Services. FedNow Service Will Raise Transaction Limit to $10 Million Individual banks can still set lower limits based on their own risk policies.
The private sector runs its own instant payment infrastructure. The Clearing House operates RTP (Real-Time Payments), which runs 24/7 for credit transfers, and CHIPS (Clearing House Interbank Payments System), which handles large-value interbank transfers using a combination of real-time matching and net settlement. CHIPS focuses on wholesale and international payments, while RTP targets the same retail and commercial space as FedNow.
For a customer, the practical distinction is this: Fedwire is what a bank uses when you request a traditional wire transfer during business hours. FedNow and RTP power the instant-send features increasingly built into banking apps. All three settle in real time, but FedNow and RTP work around the clock and cost less per transaction. Fedwire remains the default for the largest and most time-sensitive institutional payments, where the combination of real-time and gross settlement on the central bank’s own ledger is worth its price.