A Sydney prop desk runs $2.4M in ASX equities on Monday morning. By Wednesday, T+2 settlement hits simultaneously across six positions. Available working capital drops 34% for 11 hours. No single trade was wrong. No stop was missed. The desk still can't fund Tuesday's positions — because nobody modelled the settlement stack. That is a liquidity failure, not a trading failure.

ASX operates on a T+2 settlement cycle governed by the ASX Operating Rules, meaning cash and securities exchange two business days after execution. For intraday traders running multiple legs, this creates a compounding float gap. A trader executing $500K daily across five days has $5M in unsettled obligations at peak exposure — ten times single-day notional. Capital adequacy calculations that ignore this multiplier are structurally wrong.

CONCEPTT+2 settlement means your real capital exposure is always a rolling two-day stack — not today's position alone.
WARNINGSizing positions on settled-cash balances while running unsettled T+2 obligations is a fast route to a margin call you didn't see coming.
KEY IDEACapital adequacy for active ASX traders requires a rolling settlement ladder, not a single-day snapshot.

The RBA Financial Stability Review consistently flags intraday liquidity gaps as a systemic risk amplifier during volatile sessions. When the ASX experiences price dislocations — August 2015, March 2020 — settlement obligations don't pause. Brokers accelerate margin calls precisely when unsettled positions are largest. A 1R risk on each trade becomes 3R–5R effective risk once the settlement stack is factored into available capital.

Rolling Settlement Exposure vs Available Capital5M4M2M0MonTueWedThuFriSettlement ObligationsAvailable CapitalPeak Gap

The practical fix uses a rolling settlement ladder — a simple spreadsheet tracking T+1 and T+2 obligations against confirmed settled cash each morning. Position sizing is then capped at 15%–20% of settled capital per new trade, not total equity. ASIC Market Structure Reports recommend firms stress-test intraday liquidity against a two-standard-deviation volume spike. Traders wanting deeper grounding can study settlement date mechanics, review the formal treatment of settlement risk in financial systems literature, and examine how liquidity risk interacts with capital buffers under stress conditions.

The bridge doesn't fall because engineers account for every load, not just the average one. Your capital adequacy calculation must include the full settlement stack — every day, before the first order hits the market.

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