Olivia ThompsonOn 18 April 2026, Iran closed the Strait of Hormuz for the second time in a week, responding to a US naval blockade of its ports. The decision, announced by Tehran's Revolutionary Guard, sends fresh shockwaves through global energy markets — and directly threatens the financial wellbeing of millions of Australian investors and superannuation holders.
What Happened in the Strait of Hormuz
The Strait of Hormuz crisis has been escalating since 28 February 2026, when the United States and Israel launched coordinated airstrikes on Iran. By mid-March, Brent crude had surpassed $100 per barrel for the first time in four years, peaking at $126 per barrel on 8 March — the largest monthly oil price increase ever recorded.
Iran briefly reopened the Strait on 17 April following a short-lived Lebanon truce, only to close it again the following day in retaliation for the ongoing US naval blockade. Iranian gunboats fired on tanker traffic, including Indian-flagged vessels, forcing ships to turn back despite prior clearance.
According to the US Energy Information Administration, approximately 20 million barrels of petroleum pass through the Strait of Hormuz every day — representing around 20 per cent of global petroleum liquids consumption and 34 per cent of global seaborne crude oil trade. This is, by any measure, the most consequential supply chokepoint on earth.
Why Australian Investors Are Exposed
Australia's exposure to this crisis is deeper than most Australians realise.
The Australian sharemarket fell 8 per cent in March 2026 — its largest monthly decline since 2022 — as energy supply fears rattled equity portfolios. For the more than 16 million Australians with superannuation accounts holding equity exposure, those losses hit directly.
There is, however, a paradox. Australia's energy sector rallied sharply during the same period: energy stocks surged 18 per cent month-on-month, with Woodside Energy up 23 per cent. Australians with diversified super funds that include domestic energy holdings have partially offset their broader market losses.
The deeper structural risk concerns fuel security. Australia currently holds only 30 days of refined liquid fuel supply — far below the International Energy Agency's minimum recommended reserve of 90 days. This 67 per cent shortfall below the IEA safety threshold means any sustained Hormuz closure translates rapidly into domestic fuel price spikes and inflationary pressure.
What the Forecasters Are Saying
The economic projections are sobering.
According to analysis from Goldman Sachs, another month of Strait closure would sustain Brent crude above $100 per barrel throughout 2026. The Dallas Federal Reserve modelled three scenarios: a one-quarter closure would see West Texas Intermediate crude peak at $98 per barrel with global GDP growth reduced by 2.9 percentage points in the second quarter of 2026. A two-quarter closure would push WTI to $132 per barrel by July. A three-quarter closure would see oil hit $167 per barrel by October 2026.
For Australian households, those price trajectories translate into higher petrol costs, elevated inflation, and growing pressure on already-stretched mortgage budgets. The Reserve Bank of Australia will find its rate-setting decisions even more complex if imported energy inflation persists.
What Should Australian Investors Do?
Financial experts are urging caution over reactivity. Geopolitical crises are volatile, and panic-selling at market lows is one of the most reliably wealth-destroying behaviours during periods of uncertainty.
Key guidance being offered across Australian financial planning circles includes:
Build cash liquidity buffers. With inflation risk elevated and interest rate uncertainty acute, maintaining accessible cash reserves reduces the need to sell investments at depressed prices.
Review your energy exposure. Australian energy stocks have been one of the few bright spots in 2026. Depending on your super fund allocation, you may already have meaningful exposure — or conversely, you may be underweight in a sector that is outperforming.
Do not make decisions based on 24-hour news cycles. The Strait of Hormuz has closed and reopened before — in 2018 and during earlier crises — and energy markets have eventually stabilised. Long-term investors who stayed the course recovered their positions.
Consider professional advice before making portfolio changes. The current environment — combining geopolitical crisis, inflationary pressure, and a cooling property market — is genuinely complex. An accredited financial adviser can model your specific exposure, super fund allocation, and risk profile in ways that generic media guidance cannot.
Important: This article is informational only and does not constitute financial advice. Past market performance is not indicative of future results. Consult a qualified financial adviser before making any investment decisions.
The Outlook
As of 18 April 2026, diplomatic talks between Washington and Tehran are reportedly ongoing, with US President Donald Trump indicating "very good conversations" with Tehran. But optimism has been premature before. The Strait reopened briefly, then closed again within 24 hours.
For Australian investors and super holders, the message from wealth managers is consistent: this is a time for careful, informed positioning — not reaction. With over a quarter of global oil trade flowing through a waterway controlled by a nation currently in open confrontation with the world's largest naval power, the uncertainty is not going away quickly.
A qualified wealth management expert can help you understand exactly how your portfolio is positioned for what comes next.
