RBNZ Banking Supervision Handbook: BS13 Liquidity Policy¶


Regulator	Reserve Bank of NZ
Jurisdiction	NZ
Status	live
Applicability	Platform

BS13 is the RBNZ Banking Supervision Handbook standard governing liquidity risk for registered banks. It establishes minimum liquidity requirements through two core ratios: the one-week mismatch ratio and the one-month mismatch ratio, calculated from a bank's cash flow profile under stressed conditions. BS13A (the annex) defines eligibility criteria for qualifying liquid assets. The standard also establishes a core funding ratio (CFR) minimum of 75%, requiring that the majority of assets be funded by stable, long-dated liabilities.

BS13 is being superseded by the DTA Liquidity Standard, which introduces the Basel III Liquidity Coverage Ratio (LCR) and Net Stable Funding Ratio (NSFR) and takes effect 1 December 2028. Until that date, BS13 remains the operative liquidity requirement for registered banks. The platform's liquidity engine (MOD-032) computes both BS13 metrics and the DTA LCR/NSFR metrics using shared infrastructure, supporting the transition.

Compliance register¶

This register maps every material obligation under BS13 to the platform control or institutional process that satisfies it. It is the static traceability layer for the Totara compliance report — dynamic data (module build status, test evidence, control test dates) is overlaid at runtime.

Scope legend¶

Symbol	Meaning
🤖 Automated	Platform enforces or performs the obligation. Primary control mode is GATE, AUTO, CALC, or ALERT. Human action is not required in the normal case.
📊 Evidenced	Platform captures the evidence trail automatically. Human compliance decision sits on top. Primary control mode is LOG.
🏛 Institutional	Obligation is met by a process entirely outside the platform — ALCO, treasury, board governance. Platform may generate evidence inputs but does not own the process.
N/A	Obligation does not apply to this deployment configuration.

Build legend¶

Symbol	Meaning
✅	Module built and deployed
🔨	Module planned — not yet built (`build_status: Not started`)
❌	Uncontrolled gap — no module attributed

Mismatch ratio requirements¶

Ref	Obligation	Scope	Policy	Platform controls	Build
BS13 §4	Maintain a positive one-week mismatch ratio — cash inflows must cover or exceed cash outflows over the one-week stress horizon	🤖 Automated	CLQ-002	MOD-032 (CALC) — one-week mismatch ratio calculated continuously from live cash flow data; no manual spreadsheet, no T+1 lag; MOD-032 (ALERT) — ALERT fires when ratio approaches zero	🔨
BS13 §4	Maintain a positive one-month mismatch ratio — cash inflows must cover or exceed cash outflows over the one-month stress horizon	🤖 Automated	CLQ-002	MOD-032 (CALC) — one-month mismatch ratio computed in the same engine run as the one-week ratio; breach threshold configurable to provide early warning	🔨
BS13 §4	Apply prescribed stress haircuts to cash flow projections as specified in BS13	🤖 Automated	CLQ-002	MOD-032 (CALC) — stress haircut parameters loaded from regulatory configuration; applied automatically to cash flow projections without manual adjustment	🔨
BS13A §3	Hold a portfolio of qualifying liquid assets as defined in BS13A — eligible assets must meet credit quality, marketability, and currency criteria	🤖 Automated	CLQ-002	MOD-032 (CALC) — liquid asset buffer computed using BS13A eligibility rules; MOD-085 (CALC) — market rate data provides current valuations for liquid asset holdings	🔨

Core funding ratio¶

Ref	Obligation	Scope	Policy	Platform controls	Build
BS13 §5	Maintain a core funding ratio ≥75% — stable funding (retail deposits, long-term wholesale funding, equity) must cover ≥75% of total assets	🤖 Automated	CLQ-002	MOD-032 (CALC) — core funding ratio computed from live balance sheet data; funding source classifications sourced from product attributes; MOD-082 (CALC) — nostro and correspondent balances included in the funding position calculation	🔨
BS13 §5	Alert when core funding ratio approaches the 75% minimum	🤖 Automated	CLQ-002	MOD-032 (ALERT) — early warning threshold configurable above the 75% minimum; ALERT routes to ALCO and CRO automatically	🔨

Intraday liquidity¶

Ref	Obligation	Scope	Policy	Platform controls	Build
BS13 §6	Monitor intraday liquidity position throughout the business day — ensure sufficient liquidity to meet payment system obligations as they fall due	🤖 Automated	CLQ-002	MOD-001 (CALC) — intraday liquidity position calculated from real-time ledger balances; MOD-020 (CALC) — payment volume and size contributes to intraday liquidity monitoring automatically; MOD-150 (CALC) — intraday payment system exposure computed in real-time from the payment event stream	🔨
BS13 §6	Maintain intraday liquidity buffer sufficient to cover peak daily settlement obligations under stress	🤖 Automated	CLQ-002	MOD-003 (CALC) — liquidity monitoring uses live balances; sufficient funds check applied before every outbound payment; MOD-082 (GATE) — outward payments blocked if nostro balance is insufficient to fund settlement	🔨

Liquidity risk reporting¶

Ref	Obligation	Scope	Policy	Platform controls	Build
BS13 §7	Report liquidity positions (mismatch ratios, CFR) to RBNZ on the prescribed schedule	🤖 Automated	CLQ-002	MOD-036 (AUTO) — RBNZ BS liquidity returns assembled from MOD-032 output; scheduled submission without manual data extraction	🔨
BS13 §7	Disclose liquidity information in quarterly disclosure statements (BS3B/BS3C)	🤖 Automated	CLQ-002	MOD-036 (AUTO) — liquidity disclosure tables populated from MOD-032; consistent with internal monitoring figures	🔨
BS13 §8	Notify RBNZ promptly if liquidity ratios are breached or a breach is anticipated	🤖 Automated	CLQ-002	MOD-032 (ALERT) — ALERT fires automatically; MOD-036 (AUTO) — notification workflow triggered from ALERT; no reliance on manual detection	🔨

ALCO governance¶

Ref	Obligation	Scope	Policy	Platform controls	Build
BS13 §9	ALCO approval of liquidity risk appetite and funding strategy	🏛 Institutional	CLQ-002	MOD-032 and MOD-150 provide the RAF liquidity dashboard data for ALCO. Liquidity appetite decision and funding strategy sign-off are institutional.	—
BS13 §9	Annual ALCO review of liquidity contingency funding plan	🏛 Institutional	CLQ-002	Contingency funding plan design and sign-off is institutional. MOD-032 provides the scenario data used in plan testing.	—

Institutional obligations (not platform scope)¶

Obligation	Owner	Platform evidence input
ALCO oversight of liquidity risk and funding strategy	ALCO / Board	MOD-032 provides live LCR, NSFR, mismatch ratios, and CFR for ALCO reporting
Liquidity contingency funding plan design and testing	CFO / CRO	MOD-032 provides the stress scenario base; MOD-034 provides contingency scenario outputs
RBNZ notification of liquidity breaches	CFO / CEO	MOD-032 ALERT provides the trigger data for RBNZ notification
External auditor review of liquidity disclosure	External Auditor	MOD-036 provides data lineage; MOD-032 provides the calculation audit trail

Coverage summary¶

Area	Total obligations	Platform automated 🤖	Platform evidenced 📊	Institutional 🏛	N/A
Mismatch ratio	4	4	0	0	0
Core funding ratio	2	2	0	0	0
Intraday liquidity	2	2	0	0	0
Reporting	3	3	0	0	0
ALCO governance	2	0	0	2	0
Total	13	11 (85%)	0 (0%)	2 (15%)	0 (0%)

All attributed modules are currently build_status: Not started. The DTA Liquidity Standard (effective 1 December 2028) supersedes BS13 — see nz-dta-liquidity for the forward obligation register.

Policy	Title
CLQ-002	Liquidity Risk Management Policy

See D01 Capital & Liquidity for the full risk domain.

Official documentation¶

Policies referencing this standard¶

CLQ-002 — Liquidity Risk Management Policy

Compiled 2026-05-22 from source/entities/regulations/nz-bs13.yaml