RPG 117 Reporting Concepts for the Interest Rate Risk in the Banking Book data collection, including Repricing Analysis

APRA • Compiled by Market Risk team • October 2025 0 AUSTRALIAN PRUDENTIAL REGULATION AUTHORITY | APRA.GOV.AU Reporting practice guide RPG 117 Reporting Concepts for the Interest Rate Risk in the Banking Book data collection, including Repricing Analysis October 2025

APRA 1 Contents About this guide........................................................................................................................................2 Glossary...................................................................................................................................................3 Reporting Standard ARS 117.0 Repricing Analysis ...................................................................................4 Chapter 1 - On-balance sheet items .........................................................................................................5 1.1 General guidance on repricing profiles .................................................................................................................5 1.2 Fixed Rate Home Loans and Term Deposits (AUD) .............................................................................................5 1.3 Variable Rate products – Home Loans, Transaction Accounts and ESA balances (AUD) ...................................6 1.4 USD Bond hedged with a cross currency swap....................................................................................................7 1.5 Offset accounts .....................................................................................................................................................8 1.6 “Non-interest rate sensitive” time bucket..............................................................................................................8 1.7 Trading book items................................................................................................................................................8 Chapter 2 - Off-balance sheet items .........................................................................................................9 2.1 Interest rate – swaps.............................................................................................................................................9 2.2 Interest rate – options..........................................................................................................................................11 2.3 Interest rate - futures and FRAs..........................................................................................................................11 2.4 Other commitments (timing is known).................................................................................................................13 2.5 Core deposit behavioural repricing reporting......................................................................................................14 Reporting Standard ARS 117.1 Interest Rate Risk in the Banking Book .................................................17 Chapter 3 - Net Interest Income .............................................................................................................18 3.1 Guidance for reporting Value of Net Interest Income (NII) in Table 1 .................................................................18 Disclaimer and Copyright This prudential practice guide is not legal advice and users are encouraged to obtain professional advice about the application of any legislation or prudential standard relevant to their particular circumstances and to exercise their own skill and care in relation to any material contained in this guide. APRA disclaims any liability for any loss or damage arising out of any use of this prudential practice guide. © Australian Prudential Regulation Authority (APRA) 2024 This work is licensed under the Creative Commons Attribution 3.0 Australia Licence (CCBY 3.0). This licence allows you to copy, distribute and adapt this work, provided you attribute the work and do not suggest that APRA endorses you or your work. To view a full copy of the terms of this licence, visit https://creativecommons.org/licenses/by/3.0/au/

APRA 2 About this guide Reporting practice guides (RPGs) provide guidance on APRA’s view of sound practice in particular areas. RPGs frequently discuss legal requirements from legislation, regulations or APRA’s prudential and reporting standards, but do not themselves create enforceable requirements. Through this guide, APRA seeks to provide information on how key concepts may be accurately reported, including practical implementation guidance and examples. This guide does not seek to provide an all-encompassing framework, or to replace or endorse existing industry standards and guidelines. Not all the practices outlined in this RPG will be relevant for every ADI and some aspects may vary depending upon the size, complexity, and systems configuration of the ADI.

APRA 3 Glossary ADI Authorised Deposit-taking Institution Approved IRRBB Model Has the meaning given in APS 117 APRA Australian Prudential Regulation Authority APS 117 Prudential Standard APS 117 Capital Adequacy: Interest Rate Risk in the Banking Book Bank - Advanced An Australian-owned bank or a foreign subsidiary bank that has APRA’s approval or is seeking APRA’s approval to use an internal ratings-based approach to credit risk for capital adequacy purposes. ESA Exchange Settlement Account used for settlement obligations with Reserve Bank of Australia Core deposits Has the meaning given in APS 117. Non-significant financial institution (non￾SFI) An APRA-regulated entity (ADI) or its authorised non-operating holding company (NOHC) that is not a significant financial institution. Provider of purchased payment facilities (PPF) An ADI that is subject to a condition on its authority under section 9 of the Banking Act 1959 confining the banking business that the ADI is authorised to carry on to providing purchased payment facilities. Significant financial institution (SFI) An ADI (that is not a foreign ADI) or authorised NOHC and has total assets more than $20 billion, or determined as such by APRA, having regard to matters such as the complexity in its operations or its membership of a group. Standardised bank An Australian-owned bank or a foreign subsidiary bank that uses the standardised approach to credit risk for capital adequacy purposes in respect of the whole of its operations.

APRA 4 Reporting Standard ARS 117.0 Repricing Analysis This section provides examples on how to complete ARS 117.0 repricing tables for various asset and liability repricing items.

APRA 5 Chapter 1 - On-balance sheet items This chapter provides examples on how to report on-balance sheet items for ARS 117.0 repricing tables for various asset and liability repricing items. 1.1 General guidance on repricing profiles Repricing term refers to a period during which the interest rate charged on a banking book item stays fixed. In the case of fixed rate home loans, the repricing term refers to the remaining fixed rate period on a loan. Variable rate loans do not have a fixed repricing term. Accordingly, the variable rate loans should be included in the “Overnight (O/N)” time bucket, unless an ADI can demonstrate statistically that the timeframe to adjust its variable rate loans after movements in the official cash rate is longer than the mid-point of the next repricing bucket, e.g. “0 to < 1 month (excluding O/N)”. The repricing analysis is to be completed for the contractual repricing profile and the behavioural profile (expected repricing profile) of banking book items. The behavioural repricing profile of assets and liabilities should consider expected loan prepayment/amortisation rates and deposit portfolio run-off, rather than contractual repricing where these are expected to be materially different. 1.2 Fixed Rate Home Loans and Term Deposits (AUD) Example – Home Loan and Term Deposit At the June 2025 reporting date, an ADI has a $500,000 6-month term deposit and a $1 million fixed rate home loan. The original term of the home loan is 30-years with a 5-year fixed rate, and at the reporting date, only 2.5-year fixed-rate term remains on the home loan. Table 1. Contractual Repricing Profile Currency Repricing Item Tenor Cash Flow Type Value AUD Deposits - Term Deposits 3 to < 6 months Principal -500,000 AUD Home Loans - Fixed Rate 2 to < 3 years Principal 1,000,000 Note: liability items are reported as negative values. Please note that the 30-year home loan is not reported in the “20+ years” Tenor, which reflects the maturity and repayment term of the loan. Instead, it is reported in the “2 to < 3 years” time bucket, which reflects when the interest rate on the home loan will next change/reprice. In subsequent quarters, as the term of this fixed interest rate runs its course, it would be included in the “1 to < 2 years”, “9 to < 12 months” time buckets and so on.

APRA 6 Table 2. Expected Repricing Profile Using the same example as at the June 2025 reporting date, assume that the ADI instead estimates that the expected remaining fixed rate term for the home loan is 1.75 years due to customers’ prepayment behaviour, while no behavioural modelling is applied to term deposits. In this case, the fixed rate home loan would have a shorter expected repricing term of “1 to < 2 years” while the term deposit should have the same behavioural repricing profile as the contractual profile. Currency Repricing Item Tenor Cash Flow Type Value AUD Deposits - Term Deposits 3 to < 6 months Principal -500,000 AUD Home Loans - Fixed Rate 1 to < 2 years Principal 1,000,000 Note: that the term deposit line is unchanged between Table 1 and 2, while the home loan line has the shorter expected repricing term in Table 2. 1.3 Variable Rate products – Home Loans, Transaction Accounts and ESA balances (AUD) Variable rate products such as variable rate home loans, transaction accounts and exchange settlement accounts (ESAs) do not have a fixed repricing term. Accordingly, these should be included in the “Overnight (O/N)” tenor for Table 1, or the alternative time bucket for Table 2 depending on the timeframe the ADI expects to take to adjust its variable rates after movements in the official cash rate. For Table 2, should the ADI expect the repricing to occur within one month, then include the repricing cashflow in the “0 to < 1 month (excluding O/N)” tenor for Home Loans and Deposits. ESA account balances and deposits with central banks are to be captured under the “Notes & coins, Deposits with Central Banks & cash equivalents” line item. Table 1. Examples of Variable Rate products, Repricing Analysis - Contractual Currency Repricing Item Tenor Cash Flow Type Value AUD Home Loans – Variable Rate Overnight (O/N) Principal 1,000,000 AUD Deposits – Transaction Accounts Overnight (O/N) Principal -1,000,000 AUD Notes and coins, Deposits with Central Banks and Cash Equivalents Overnight (O/N) Principal 1,000,000

APRA 7 Table 2. Examples of Variable Rate products, Repricing Analysis - Expected Currency Repricing Item Tenor Cash Flow Type Value AUD Home Loans – Variable Rate 0 to < 1 month (excluding O/N) Principal 1,000,000 AUD Deposits – Transaction Accounts 0 to < 1 month (excluding O/N) Principal -1,000,000 AUD Notes and coins, Deposits with Central Banks and Cash Equivalents Overnight (O/N) Principal 1,000,000 1.4 USD Bond hedged with a cross currency swap An ADI issued a 5-year $10 million floating rate Euro-Medium-Term-Note (EMTN) with three month resetting denominated in USD on 28 June 2025. On the same day, the ADI entered into a cross-currency basis swap to hedge the offshore transaction which nets off all USD cash flows (including principal and coupons) and exposes the ADI to only AUD cash flows on the AUD leg of the cross-currency swap. The bond and the cross-currency basis swap are reported separately with bond notional netting off the swap notional (receive leg) in USD, leaving a net AUD funding position. As per ARS 117.0, amounts denominated in foreign currency (in this example, USD exposure) are to be converted to AUD. For this example, the AUD/USD exchange rate of 0.645 is used. Hence, $10m USD is equivalent to ~$15.5m AUD. For June 2025 reporting, the following positions should be reported. Currency Repricing Item Tenor Cash Flow Type Value USD Bond issuance 3 to < 6 months Principal -15,500,000 USD Interest Rate Swap (basis swap) 3 to < 6 months Principal +15,500,000 AUD Interest Rate Swap (basis swap) 3 to < 6 months Principal -15,500,000

APRA 8 1.5 Offset accounts When a deposit balance is used to offset interest payments on a home loan, that deposit balance would assume the repricing profile of the underlying loan. There are two types of offset accounts:

1. A deposit account with offset feature which offsets interest charged on a variable rate home loan; this offset account balance should have the same repricing profile of the variable rate loan, e.g. overnight repricing. Note: This balance should be excluded from calculation of core deposits.
2. A deposit account with offset feature which offsets interest charged on a fixed rate home loan; this offset account balance should have the same repricing profile of the fixed rate loan. 1.6 “Non-interest rate sensitive” time bucket Not all assets and liabilities are exposed to interest rate risk. In such cases, these balance sheet items should be reported in the “Non-interest rate sensitive” time bucket. Examples of such balance sheet items are: Other Assets • Property, Plant and Equipment • Investments in associates and joint ventures • Goodwill and intangible assets Other Liabilities • Provisions • Other accounts payable • Tax liabilities 1.7 Trading book items Items in the trading book are to be excluded from ARS 117.0 reporting. If any funding is provided to the trading book on a tenor longer than overnight, it should be included in ARS 117.0 as an asset if, and only if, the funding is included as a liability in the ADI’s calculations of capital for traded market risk under Prudential Standard APS 116 Capital Adequacy: Market Risk. If included, the funding should be allocated to the appropriate time bucket(s) according to the term of the funding.

APRA 9 Chapter 2 - Off-balance sheet items This chapter provides examples on how to complete ARF 117.0 repricing tables for various off-balance sheet items e.g. swaps, futures, options and forward rate agreements (FRAs). For derivative instruments, the underlying cash flows should be recorded with the correct sign (positive (+) and negative (-)) per the examples below. 2.1 Interest rate – swaps For an interest rate swap, the fixed leg should be allocated to the time bucket corresponding to the residual maturity of the swap and the floating leg should be allocated to the time bucket corresponding to the next rate reset date. Additionally, the pay side should be recorded as negative face value, while the receive side should be recorded as positive face value. Example 1 – Payer Swap An ADI enters into a 2.5-year quarterly re-setting swap with a face value of $5 million, under which the ADI pays fixed and receives floating with quarterly resets. The swap should be initially recorded in the repricing analysis form as negative $5 million in the “2 to < 3 years” time bucket (as the swap has a residual maturity of 2.5 years) and positive $5 million in the “2 to < 3 months” time bucket (as the next interest rate reset date occurs in 3 months’ time). Refer to the table below. Currency Repricing Item Tenor Cash Flow Type Value AUD Interest rate - swaps (pay fixed) 2 to < 3 years Principal -5,000,000 AUD Interest rate - swaps (pay fixed) 2 to < 3 months Principal 5,000,000 In subsequent quarters, the two legs of the swap would be allocated to different time buckets, as appropriate, such that the fixed leg corresponds to the residual maturity of the swap and the floating leg corresponds to the next rate reset date. The sum of the swap notional values of both legs (fixed and floating leg) should be zero.

APRA 10 Example 2 – Receiver Swap On 11 June 2025, an ADI enters into a 4.5-year semi-annual resetting swap with a face value of $10 million, under which the ADI receives fixed and pays floating with semi-annual resets. The swap should be recorded in the repricing analysis form as at 30 June 2025 as positive $10 million in the “4 to < 5 years” time bucket (as the swap has a residual maturity of just less than 4.5 years) and negative $10 million in the “3 to < 6 months” time bucket (as the next reset date of 11 December 2025 occurs in just under 6 months’ time). Currency Repricing Item Tenor Cash Flow Type Value AUD Interest rate - swaps (receive fixed) 4 to < 5 years Principal 10,000,000 AUD Interest rate - swaps (receive fixed) 3 to < 6 months Principal -10,000,000 In the subsequent quarter, the two legs of the swap would be allocated to different time buckets, as appropriate. To illustrate, on 30 September 2025 the swap should be recorded as positive $10 million in the “4 to < 5 years” time bucket and negative $10 million in the “2 to < 3 months” time bucket (as the next reset date of 11 December 2025 is at that point just under three months away). Currency Repricing Item Tenor Cash Flow Type Value AUD Interest rate - swaps (receive fixed) 4 to < 5 years Principal 10,000,000 AUD Interest rate - swaps (receive fixed) 2 to < 3 months Principal -10,000,000

APRA 11 2.2 Interest rate – options Options must be treated on the basis of the delta-equivalent amounts of the underlying or notional underlying. Example An ADI has an interest rate swaption maturing in 6 months which grants the ADI an option to enter into a 4-year receive-fixed rate swap. The underlying swap has $1 million notional with a floating leg resetting every 3 months. Assume the option delta as at the reporting date is 0.5. Delta-equivalent amount of the underlying swap should be calculated as 0.5 * $1 million, or $500,000. Currency Repricing Item Tenor Cash Flow Type Value AUD Interest rate - options 6 to < 9 months Principal -500,000 AUD Interest rate - options 4 to < 5 years Principal 500,000 2.3 Interest rate - futures and FRAs Example 1 – Futures: Bought 90-day bank bills For a futures contract, the face value should be allocated to time buckets according to the cash flows of the underlying physical instrument. On 25 June 2025, an ADI purchases 20 Sydney Futures Exchange September 2025 90-day bank bill futures contracts. This transaction results in a notional cash outflow in September 2025 for the purchase of the underlying physical 90-day bank bills and a notional cash inflow in December 2025 when the bank bills mature. This futures transaction should be recorded in the 30 June 2025 repricing analysis form as negative $20 million in the “2 to < 3 months” time bucket (as the underlying physical bills will be purchased in three months’ time) and positive $20 million in the “3 to < 6 months” time bucket (as the bills mature in 6 months’ time). Refer to the table below for reporting in June 2025. Currency Repricing Item Tenor Cash Flow Type Value AUD Interest rate – futures and FRAs 2 to < 3 months Principal -20,000,000 AUD Interest rate - futures and FRAs 3 to < 6 months Principal 20,000,000

APRA 12 Example 2 – Futures: Sold 90-day bank bills On 23 September 2025, an ADI sells 15 March 2026 bank bill futures contracts. This transaction results in a notional cash inflow in March 2026 when the ADI sells the bank bills and a notional cash outflow in June 2026 when the bank bills mature. This futures transaction would be recorded in the 30 September 2025 repricing analysis form as positive $15 million in the “3 to < 6 months” time bucket (as the physical bills will be sold in 6 months’ time) and negative $15 million in the “6 to < 9 months” time bucket (as the physical bills mature in 9 months’ time). Currency Repricing Item Tenor Cash Flow Type Value AUD Interest rate – futures and FRAs 6 to < 9 months Principal -15,000,000 AUD Interest rate - futures and FRAs 3 to < 6 months Principal 15,000,000 In subsequent quarters, the futures transaction would be allocated to different time buckets, as appropriate. For example, on 31 December 2025 for the bank bill futures contracts, the positive $15 million would have moved into the “2 to < 3 months” time bucket and the negative $15 million would have moved into the “3 to < 6 months” time bucket. Currency Repricing Item Tenor Cash Flow Type Value AUD Interest rate – futures and FRAs 3 to < 6 months Principal -15,000,000 AUD Interest rate - futures and FRAs 2 to < 3 months Principal 15,000,000 The approach described above for allocating bought and sold bank bill futures to the repricing analysis forms also applies to bond futures.

APRA 13 Example 3 – Forward rate agreements (FRAs) from lender’s perspectives As with a futures contract, an FRA contract is similarly broken down into the underlying notional cash flows. An FRA 2/5 (which is an FRA that starts in 2 months’ time and ends in 5 months’ time) for $50 million as a lender (also termed receiver (of interest)) would be reported as negative $50 million in the “2 to < 3 months” time bucket and positive $50 million in the “3 to < 6 months” time bucket. This represents lending $50 million in 2 months’ time until 5 months. Currency Repricing Item Tenor Cash Flow Type Value AUD Interest rate – futures and FRAs 2 to < 3 months Principal -50,000,000 AUD Interest rate - futures and FRAs 3 to < 6 months Principal 50,000,000 Example 4 – Forward rate agreements (FRAs) from borrower’s perspectives An FRA 1/4 (which is an FRA that starts in 1 months’ time and ends in 4 months’ time) for $100 million as a borrower (also termed payer (of interest)) would be reported as a positive $100 million in the “0 to < 1 month (excluding O/N)” time bucket and a negative $100 million in the “3 to < 6 months” time bucket. Currency Repricing Item Tenor Cash Flow Type Value AUD Interest rate – futures and FRAs 0 to < 1 month (excluding O/N) Principal 100,000,000 AUD Interest rate - futures and FRAs 3 to < 6 months Principal -100,000,000 2.4 Other commitments (timing is known) Other commitments should only be included where the timing is known and the commitment affects the ADI’s current interest rate risk profile. For example, a loan approved but not yet advanced where a 2-year fixed rate has been offered to the borrower should be included in the “1 to < 2 years” time bucket. In contrast to this, a loan approved but not yet advanced, where no rate has been locked in, should be omitted.

APRA 14 2.5 Core deposit behavioural repricing reporting In reporting the ADI’s Deposit Replicating Portfolio different methodologies apply in Table 1 and Table 2 below based on the class of ADI and whether the ADI conducts behavioural analysis to determine core / non-core deposits. The methodology that applies is as per the following table. Allocation methodology of core deposit balance to the repricing time buckets Class of ADI Table 1 Table 2 Bank – Advanced Internal behavioural assumptions (as per the Approved IRRBB model) Internal behavioural assumptions All other ADIs (except PPFs) who: conduct behavioural analysis to determine core/non-core deposits APRA prescribed Internal behavioural assumptions do not conduct behavioural analysis to determine core/non-core deposits None* None* *ADIs that do not conduct behavioural analysis to determine core/non-core deposits should not report a deposit replicating portfolio in Table 1 nor Table 2. For entities required to allocate the core deposit balance to the repricing buckets according to the APRA prescribed profile, the following prescribed allocation assumptions should be used for core deposits. Tenor Proportion of Core deposits Overnight (O/N) -100% 0 to <1 month (excluding O/N) 4% 1 to <2 months 5% 2 to <3 months 5% 3 to <6 months 10% 6 to <9 months 10% 9 to <12 months 12%

APRA 15 Tenor Proportion of Core deposits 1 to <2 years 27% 2 to <3 years 27% 3+ years 0% Total 0% An ADI has a transaction account balance of $100m and a saving account balance of $200m with overnight contractual maturity. The ADI has determined based on its behavioural analysis that 80% of the transaction account balance is core, and 20% of the saving account balance is core. The total core deposit balance for this ADI would be $120m (100m * 80% + 200m * 20%). Details of how this should be reported are shown in the tables below. Table 1. Contractual Currency Repricing Item Tenor Cash Flow Type Value AUD Deposits - Transaction Accounts Overnight (O/N) Principal $100m AUD Deposits - Saving Accounts Overnight (O/N) Principal $200m AUD Deposit Replicating Portfolio Overnight (O/N) Principal -$120m (Core deposit balance) AUD Deposit Replicating Portfolio 0 to <1 month (excluding O/N) Principal $4.8m ($120m * 4%) AUD Deposit Replicating Portfolio 1 to < 2 months Principal $6m ($120m * 5%) AUD Deposit Replicating Portfolio 2 to < 3 months Principal $6m ($120m * 5%) AUD Deposit Replicating Portfolio 3 to < 6 months Principal $12m ($120m * 10%) AUD Deposit Replicating Portfolio 6 to < 9 months Principal $12m ($120 * 10%) AUD Deposit Replicating Portfolio 9 to < 12 months Principal $14.4m ($120m * 12%) AUD Deposit Replicating Portfolio 1 to < 2 years Principal $32.4m ($120m * 27%) AUD Deposit Replicating Portfolio 2 to < 3 years Principal $32.4m ($120m * 27%)

APRA 16 Table 2. Expected For an ADI using its own behavioural assumptions for core deposits, the allocation percentage for each repricing time bucket may differ from the APRA prescribed allocations. Currency Repricing Item Tenor Cash Flow Type Value AUD Deposits - Transaction Accounts Overnight (O/N) Principal $100m AUD Deposits - Saving Accounts Overnight (O/N) Principal $200m AUD Deposit Replicating Portfolio Overnight (O/N) Principal -$120m (Core deposit balance) AUD Deposit Replicating Portfolio 0 to <1 month (excluding O/N) Principal $6m ($120m * 5%) AUD Deposit Replicating Portfolio 1 to < 2 months Principal $6m ($120m * 5%) AUD Deposit Replicating Portfolio 2 to < 3 months Principal $6m ($120m * 5%) AUD Deposit Replicating Portfolio 3 to < 6 months Principal $6m ($120m * 5%) AUD Deposit Replicating Portfolio 6 to < 9 months Principal $12m ($120 * 10%) AUD Deposit Replicating Portfolio 9 to < 12 months Principal $12m ($120m * 10%) AUD Deposit Replicating Portfolio 1 to < 2 years Principal $36m ($120m * 30%) AUD Deposit Replicating Portfolio 2 to < 3 years Principal $36m ($120m * 30%) Please note that the Deposit Replicating Portfolio deducts the $120m core deposit balance from the “Overnight (O/N)” time bucket and spreads the allocation of the core deposit balance from the “0 to 1 month (excluding O/N)” to “2 to < 3 years” time buckets.

APRA 17 Reporting Standard ARS 117.1 Interest Rate Risk in the Banking Book This section provides guidance for ADIs in reporting ARS 117.1.

APRA 18 Chapter 3 - Net Interest Income 3.1 Guidance for reporting Value of Net Interest Income (NII) in Table 1 Changes in interest rates affect a bank’s earnings by altering interest rate-sensitive income and expenses, affecting its NII. In ARS 117.1 Table 1, ADIs are required to report the ‘Value of NII’ across a ‘Baseline’ scenario and six prescribed interest rate shock scenarios, as defined in Basel Committee on Banking Supervision (BCBS) (2016) Interest Rate Risk in the Banking Book1 . These include: i. Parallel shock up; ii. Parallel shock down; iii. Steepener shock (short rates down and long rates up); iv. Flattener shock (short rates up and long rates down); v. Short rate shock up; and vi. Short rate shock down. The value of NII is to be calculated across each currency, when including and excluding the earnings offset from the model. For the purposes of reporting the value of NII, APRA expects ADIs to: • Include expected cash flows (including commercial margins and other spread components) arising from all interest rate-sensitive assets, liabilities and off-balance sheet items in the banking book. For simplicity, fees and commissions are not to be included in NII metrics. • Assume a constant balance sheet assumption; and • Utilise future interest income over a rolling 12-month period with an instantaneous shock applied. The ‘Baseline’ or base case scenario reflects the ADI’s current corporate plan in projecting the volume, pricing and repricing dates of future business transactions. Interest rates used for resetting transactions in the base scenario can be derived from market expected rates or from spot rates. The rate for each instrument should also contain appropriate projected spreads and margins. In calculating the value of NII across each of the six prescribed interest rate shock scenarios, APRA expects that ADIs use their internal models to predict the path of interest rates and the run-off of existing assets and liabilities. The value of NII is also sensitive to the ADI’s assumptions about customer behaviour as well as the anticipated management response to different rate scenarios. As such, APRA expects the change in projected NII to be computed over a forward-looking rolling 12-month period compared with the ADI’s own best estimate 12-month projections, using a constant balance sheet assumption and an instantaneous shock. 1 Interest rate risk in the banking book (bis.org)

APRA 19 Please note that margins of the new instruments shall be based on the margins from recently bought or sold products with similar characteristics. Where an ADI assumes for the purpose of NII modelling to replace all instruments with variable rate instruments, that this be expressed as a variable rate instrument with a margin. In the case of instruments with observable market prices, current market spreads should be used and not historical market spreads.