Company: WEBNF
Filing Date: 2025-06-26
Form Type: 424B5
Source: 0001104659-25-062718
Chunk: 102

Company: WESTPAC BANKING CORP
Filing Date: 2025-06-26
Form: 424B5
Chunk 102
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 currency on the date of receipt.

A Senior Debt Security that provides for payments in more than one currency generally will be treated as a “contingent payment debt instrument”, and the special rules applicable to such instruments will be described in the applicable prospectus supplement or term sheet.

#### Aggregation Rules
The Treasury Regulations relating to OID contain special aggregation rules stating in general that, subject to certain exceptions, debt instruments issued in the same transaction or related transactions to a single purchaser may be treated as a single debt instrument with a single issue price, maturity date, yield to maturity and stated redemption price at maturity for purposes of the OID rules. Under certain circumstances, these provisions could apply to a U.S. Holder that purchases Senior Debt Securities from more than one series of Senior Debt Securities.

#### Substitution of the Issuer
If with respect to any series of Senior Debt Securities a successor corporation is substituted for Westpac, such substitution could be treated for U.S. federal income tax purposes as a taxable exchange of such Senior Debt Securities as in place prior to such substitution for such Senior Debt Securities as in place after such substitution. See above under “— Sale, Exchange, Redemption or Other Disposition of the Senior Debt Securities”. U.S. Holders should consult their own tax advisors as to the U.S. federal income tax considerations relating to such an event.

#### Medicare Tax
In addition to regular U.S. federal income tax, certain U.S. Holders that are individuals, estates or trusts are subject to a 3.8% tax on all or a portion of their “net investment income”, which may include all or a portion of their interest income (including accrued OID) on, and net gain from the sale, exchange, redemption or other disposition of, a Senior Debt Security.

#### Backup Withholding and Information Reporting
Backup withholding and information reporting requirements generally apply to interest (including OID) and principal payments made to, and to the proceeds of sales by, certain non-corporate U.S. Holders. A U.S. Holder not otherwise exempt from backup withholding generally can avoid backup withholding by providing a properly executed IRS Form W-9 to the applicable withholding agent. Backup withholding is not an additional tax. Any amounts withheld under the backup withholding rules generally will be allowed as a refund or a credit against a U.S. Holder’s U.S. federal income tax liability, provided the required information is timely furnished by such U.S. Holder to the IRS.

Disclosure Requirements for Certain Holders Recognizing Significant Losses

A U.S.