Real-time gross settlement (RTGS)

Real-time gross settlement, or RTGS, is the way the world’s large-value payment systems move money. Each payment is settled on its own, at full value, the moment it is processed, using central bank money. The CPMI defines it as the real-time settlement of payments, transfer instructions, or other obligations individually on a transaction-by-transaction basis. Two words carry the meaning: gross, because payments are not netted against each other, and real-time, because settlement is continuous and immediate rather than batched.

The reason this matters is settlement finality. As the BIS puts it, under RTGS payments are settled immediately one by one, and because they are final and irrevocable, settlement risk is eliminated. The moment the payment settles, it is done, and the receiving party can treat the funds as theirs.

Why central banks built it

RTGS is a relatively modern answer to an old danger. Before it, large-value payments accumulated through the day and settled net at the end, which left banks exposed to each other in between. Central banks moved to RTGS to close that exposure. Fedwire, the Federal Reserve’s system, is the oldest, with origins going back to 1918. The model spread quickly: in 1985 only three central banks operated RTGS systems, and by 1990 there were eight, including the systems of Germany, Japan, Switzerland, and the United States.

The scale is enormous. Fedwire settled roughly $4.6 trillion in average daily value in 2025, across around 870,000 payments a day, an average of over five million dollars per transfer. These are the rails on which wholesale finance settles.

The cost of certainty

RTGS removes settlement risk, but it does so by demanding liquidity. If every payment settles in full, one by one, a bank needs funds available for each one as it goes out, rather than only for its net position. That liquidity has to be found and held, which is why real-time systems are often paired with liquidity-saving features such as payment queuing and frequent offsetting, and why some large systems adopt a hybrid design that blends gross and net settlement. The choice between RTGS and deferred net settlement is, at heart, a choice about where to sit on the line between liquidity cost and settlement risk.