The ACSS is where Canada's everyday retail payment items clear: cheques, EFT credits and debits (payroll, direct deposits, PADs), bill payments, and point of sale debit. It does not settle payments one by one. Items are exchanged between direct clearers in batches, the system tallies each participant's multilateral net position, and those net positions settle the next business day in central bank money across settlement accounts at the Bank of Canada. That is deferred net settlement, the opposite of Lynx's real time gross model. The ACSS carries roughly 99 percent of the transaction volume across Payments Canada's systems but only about 13 percent of the value, and the Bank of Canada oversees it as a prominent payment system.
In a flow
ACSS sits on the clearing layer between banks: batch items flow in and get tallied, not settled, so the diagram shows message legs through ACSS and a separate money leg the next business day, when each bank's net position settles across its account at the Bank of Canada.
Common misconceptions
Myth: ACSS settles each payment as it clears.
Reality: It is a deferred net system. Items are exchanged in batches and only each bank's overall net position settles, the next business day, at the Bank of Canada. The posting you see in an account and the interbank settlement are separate events on different clocks.
Myth: Everything in Canadian payments clears through ACSS.
Reality: Interac e-Transfers clear over Interac's own platform and card network transactions clear through the networks; the banks' resulting obligations settle separately. ACSS's lanes are the retail batch traffic: cheques, EFT/AFT items like payroll and PADs, bill payments, and point of sale debit.
Related terms
See it in a guide
Sources
- Retail batch payment system (ACSS) ↗ · Payments Canada (operator). What ACSS clears, next business day settlement at the Bank of Canada, and the 99 percent volume / 13 percent value split.
- Oversight of designated clearing and settlement systems ↗ · Bank of Canada. ACSS designated as a prominent payment system; Lynx as systemically important.
Educational, plain-English explainers. Not legal, compliance, tax, or financial advice. These cover fundamentals, not current fees, limits, or rates (which change). Rails and parties vary by program and country, so verify specifics against primary sources. Last reviewed June 2026.