Foreign pensions in Australia: how UK, NZ, US, and other pensions are taxed and treated by Centrelink

For Australians who spent part of their working life overseas, retirement income can arrive from multiple directions at once — Australian superannuation, the Age Pension, and a foreign pension from the UK, New Zealand, the United States, or elsewhere. Each of those income streams interacts with the Australian tax system and Centrelink in its own way, and the interactions are not always intuitive. Surprises are common: unexpected tax bills, Centrelink debts for unreported foreign income, and misunderstandings about which rules still apply after the recipient moves to Australia. This article gives a plain-language overview of how foreign pensions are treated.

How are foreign pensions taxed in Australia?

For Australian tax residents, foreign pensions are generally assessable income — they are included in your Australian taxable income and taxed at your marginal rate, in the same way as Australian-source income. Where the source country withholds tax before paying you, Australia generally allows a foreign income tax offset (under Division 770 of the Income Tax Assessment Act 1997) to prevent double taxation. The offset reduces your Australian tax by the amount of foreign tax paid, so you are not taxed twice on the same income. Most major source countries — the UK, US, New Zealand, Germany, Italy, Ireland, the Netherlands — have tax treaties with Australia that affect the source-country withholding rate and the Australian offset calculation. The general principle is that you declare the foreign pension as income in Australia and claim credit for what was withheld abroad; the practical numbers depend on which country and which treaty applies.

Foreign pension amounts are converted to Australian dollars for both tax and Centrelink purposes. The ATO publishes annual average foreign currency exchange rates; using the correct rate matters, and using a rate that differs from the ATO's can produce discrepancies that trigger review.

Why is the UK State Pension frozen for Australian residents?

Australian residents receiving the UK State Pension face a feature of UK pension policy that surprises many people: the pension is frozen at the rate in payment when the recipient first claims it, with no annual indexation. In the UK, the State Pension is indexed each year under the triple-lock arrangement (rising by the higher of wages growth, price inflation, or 2.5%). Australian residents do not receive that indexation. A retiree who claimed the UK State Pension at age 67 and has lived in Australia for 20 years still receives the same nominal weekly amount as at claim date, while a UK-resident contemporary has seen their payment increase annually throughout.

This matters for claim timing. Delaying UK State Pension claim (beyond state pension age) increases the weekly amount, because UK rules apply an increment for deferred claim periods. For Australians, the rate locked in at the eventual claim date will apply for the rest of their life — so claiming later locks in a higher frozen rate. The trade-off between a higher rate and years of forgone payment is a genuine calculation worth doing, particularly for those with long UK work histories and reasonable life expectancy.

The UK State Pension is taxable in Australia at marginal rates. Under the Australia–UK tax treaty, it is generally not subject to UK withholding for Australian residents, so the full amount is declared and taxed in Australia.

How does New Zealand Superannuation work for Australian residents?

Australia and New Zealand have a bilateral social security agreement that coordinates their respective retirement income systems. For Australians with NZ work history who are entitled to NZ Superannuation (New Zealand's equivalent of the Age Pension), the trans-Tasman arrangements allow portability of entitlements in both directions. The practical effect varies depending on where you live, how long you lived and worked in each country, and the specifics of your entitlement — the bilateral agreement simplifies pension management for most people with work history across both countries, but the specific application depends on individual circumstances. NZ Super received by an Australian resident is assessable in Australia.

What changed for Australian recipients of US Social Security?

For many years, Australians with US Social Security entitlements faced a significant reduction under a provision called the Windfall Elimination Provision (WEP). WEP reduced US Social Security benefits for people who also received a pension from employment where Social Security taxes were not paid — and Australian superannuation counted as such a "non-covered" pension for US purposes. For retirees with modest US work histories and substantial Australian super, the reduction could be substantial.

This changed on 5 January 2025, when President Biden signed the Social Security Fairness Act (H.R. 82) into law. The Act repealed the Windfall Elimination Provision in full. It also repealed the related Government Pension Offset (GPO), which had reduced survivor and spousal Social Security benefits for recipients of certain non-covered pensions. As a result, Australians who were previously receiving reduced US Social Security benefits due to WEP are now entitled to receive their full unreduced benefit. The Social Security Administration (SSA) is processing retroactive adjustments for affected beneficiaries.

For Australians with US work history who are not yet claiming Social Security, the calculation has changed: the WEP penalty that previously made US Social Security less valuable for those with Australian super no longer applies. Australians with meaningful US work history should revisit their US Social Security claiming strategy in light of the repeal.

US Social Security received by Australian residents is assessable in Australia. The US may withhold tax before payment (the rate depends on the Australia–US tax treaty and residency status), and an Australian foreign income tax offset is available for any US tax paid.

How does Centrelink treat foreign pension income?

For Australian Age Pension purposes, foreign pensions count as income under the income test. They are assessed in Australian dollars at the applicable exchange rate, and they reduce Age Pension entitlement in the same way as any other income. Centrelink requires pensioners to disclose foreign pension receipt and amounts, and to notify of changes to foreign pension rates.

Failure to disclose foreign pension income is a significant risk. The ATO and Services Australia share information with foreign tax and pension authorities, and non-disclosure of foreign income can produce substantial backdated debts plus potential penalties. The information-sharing arrangements are active and effective — "Centrelink doesn't know" is not a safe assumption.

Some bilateral social security agreements affect Australian Age Pension entitlement directly, typically through totalisation provisions that combine work history from both countries to determine whether a person qualifies for a pension in either country, or portability provisions that allow continued Australian Age Pension receipt while living in the agreement country. Australia has agreements with the UK, New Zealand, the US, Italy, Germany, the Netherlands, Ireland, Japan, Korea, and others. The specific terms of each agreement affect both Australian and foreign pension entitlements, and for retirees with significant overseas work history, understanding the relevant agreement's terms is worthwhile.

What practical steps should foreign pension recipients take?

Transparent reporting to both the ATO and Centrelink is the foundational requirement. Beyond that, foreign currency receipt creates ongoing exchange rate exposure — the AUD amount of a fixed foreign-currency pension varies from year to year as exchange rates move. For larger foreign pension amounts, the timing of currency conversion can be worth managing.

Cross-border tax and social security is genuinely technical. For most people with a modest foreign pension and simple circumstances, the general principles above will be sufficient to understand their position. For those with complex situations — large foreign pensions, entitlements in multiple countries, defined benefit pensions from overseas employers, or uncertainty about treaty treatment — specialist advice from an accountant experienced in cross-border tax is worth seeking. The cost is usually modest relative to the long-term tax and Centrelink consequences of getting it wrong.