Real-time gross settlement (RTGS)
Also known as: RTGS, Lynx, Fedwire, CHAPS, high-value payment system, wire transfer system
A real-time gross settlement (RTGS) system is the high-value backbone of a country's financial system: it settles payments between banks one at a time, immediately and with finality, usually in central bank money.
While most people never touch one directly, every large wire, house closing, and interbank transfer depends on it. Canada's RTGS system is Lynx, the US runs Fedwire, the UK uses CHAPS, and the euro area runs T2.
Real-time gross settlement (RTGS), explained at three levels
At home
When you buy a house, the money to the seller has to arrive in full, on time, and with no chance of bouncing. That big payment travels through the country's RTGS system, which moves money between banks one payment at a time and makes it final instantly. Think of it as the armoured truck of the banking world.
At work
Businesses use RTGS systems when they send large or urgent wires, such as paying for equipment, closing an acquisition, or settling with a major supplier. The money arrives the same day and can't be reversed, which is exactly why it's trusted for big amounts.
At home
'Gross' means each payment is settled on its own rather than bundled with others and netted at the end of the day. 'Real-time' means it happens as soon as the payment is processed. The trade-off is that banks need enough money on hand for every payment, which is why these systems are used mainly for large, important transfers rather than everyday ones.
At work
RTGS systems usually run during set operating hours (some are extending toward 24/7), settle in central bank money, and give final, irrevocable payment. Companies typically reach them through their bank's wire service. Lynx, Fedwire, and CHAPS all use or are moving to ISO 20022 messages, so wires can carry structured remittance data like smaller payments do.
At home
The core risk RTGS eliminates is settlement risk between banks. In a net system, if one bank fails before the end-of-day settlement, everyone who expected money from it is exposed. In RTGS, each payment is settled immediately, so there's no pile-up. In my opinion, that's why RTGS became the global standard for systemically important payments after the 1970s and 1980s taught regulators some hard lessons.
At work
Pure RTGS is liquidity-hungry, since banks must fund every payment as it goes. Modern systems add liquidity-saving mechanisms that queue payments and offset them in small batches, combining gross settlement's safety with some of netting's efficiency. Lynx includes such a mechanism. Instant payment rails like the RTR and FedNow can be thought of as RTGS-like systems for small payments, which is why their liquidity management and operating hours raise similar design questions.
Real-world examples
At home
Thomas and his partner were closing on their first condo. On closing day, their lawyer sent the full purchase price to the seller's lawyer by wire. Behind the scenes, the payment went through Lynx, Canada's RTGS system, so it settled with finality within moments and the keys could be released the same afternoon.
At work
Carlos is a treasury analyst at a manufacturer that pays a large overseas supplier each quarter. He schedules those payments as wires early in the business day because they move through RTGS systems with fixed operating hours. Missing the cutoff means the money lands a day late, which once triggered a late penalty.
How it compares
| feature | Real-time gross settlement (RTGS) | Deferred net settlement |
|---|---|---|
| Settlement | Each payment individually, immediately | Payments bundled and offset, settled later |
| Typical use | Large, urgent, systemically important payments | High-volume retail payments like direct deposits |
| Settlement risk | Very low | Higher, since exposures build up during the day |
| Liquidity needed | High | Low |
| Canadian example | Lynx | ACSS (cheques, pre-authorized debits) |
RTGS trades liquidity for safety, which is why it carries the big, critical payments.
For analysts
If your organization sends large payments, the RTGS operating hours and your bank's wire cutoffs should be written into your process maps. I've seen late wires cost more in penalties and supplier goodwill than a year of bank fees. Cutoff times are a business rule, not an IT detail.
History & origin
The US Fedwire service traces its roots to 1918, when the Federal Reserve began moving funds by telegraph, and it became a true real-time gross system in the decades after. Through the 1980s and 1990s, central banks shifted toward RTGS designs because netting large payments at the end of the day created dangerous chains of exposure if one bank failed. The UK's CHAPS moved to RTGS in 1996. Canada took a different path for years: its Large Value Transfer System, launched in 1999, used a hybrid design with collateral pools. Payments Canada replaced it with Lynx on August 31, 2021, a genuine RTGS system designed for stronger risk management. The euro area consolidated its system into T2 in March 2023. My view is that RTGS is the least glamorous and most important payment infrastructure in any economy. It's what keeps one bank's failure from becoming everyone's problem.