If you’ve filled up your tank lately, you already know: gas prices have been painful. The national average recently crossed $4.00 per gallon — and in some parts of the country, it’s climbing higher by the week. Prices jumped sharply this spring, and the cause traces directly to a military conflict unfolding thousands of miles away. Understanding the mechanics behind that connection isn’t just interesting — it’s financially relevant to every household budget in America.
So how does geopolitical instability in Iran translate into a higher number on the sign at your local gas station? The answer involves global commodity markets, critical shipping infrastructure, and a refining and distribution chain that links crude oil in the Persian Gulf to the fuel in your car. Let’s walk through it.
Crude Oil: The Foundation of Every Gallon
Gasoline is refined from crude oil — a hydrocarbon mixture extracted from reservoirs beneath the earth’s surface. Before it reaches a pump, crude oil is transported to refineries where it’s processed into gasoline, diesel, jet fuel, and other petroleum products. Because crude is the primary raw material, its market price is the single largest driver of what you pay at the pump — typically accounting for 50 to 60 percent of the retail price of a gallon in normal conditions.
Crude oil trades on global commodity exchanges, and like any market, its price is governed by supply and demand. When supply is constrained — whether through production cuts, sanctions, or physical disruptions to infrastructure — prices rise. That’s precisely the situation we’re in right now, and the disruption at the center of it is one of the most significant in the history of global oil markets.
The Strait of Hormuz: Where Geography Becomes Economics
The Strait of Hormuz is a narrow waterway separating Iran from the Oman Peninsula at the mouth of the Persian Gulf. Despite its relatively small geographic footprint, it functions as the world’s most critical oil transit chokepoint — roughly one-fifth of all globally traded crude oil passes through it daily. Qatar, Saudi Arabia, Kuwait, Iraq, and the UAE all rely on it to export their petroleum to markets in Asia and Europe.
Earlier this year, as part of an escalating military conflict between the United States and Iran, Iran closed the strait to most commercial ship traffic. The consequences were immediate and severe. Oil prices surged. The International Energy Agency described the disruption as the largest supply shock in the history of the global oil market. When 20 percent of the world’s seaborne crude supply is suddenly cut off, the price response isn’t gradual — it’s sharp.
Even after a ceasefire was announced in early April, traffic through the strait remained well below pre-conflict levels. As of this week, Iran has again restricted access and struck ships attempting to pass through, sending Brent crude back above $96 per barrel. The ongoing uncertainty compounds the price pressure, because oil traders, refiners, and airlines all price risk into their contracts when they can’t reliably forecast supply.
The Four Components of a Gallon of Gas
Crude oil is the biggest variable, but the retail price of gasoline reflects costs accumulated across the entire supply chain. Those costs break down into four main categories:
Crude oil: In normal market conditions, this represents roughly half to three-fifths of the pump price. With WTI crude trading between $90 and $115 per barrel at various points this spring, this component has been significantly elevated.
Refining: Converting crude into finished gasoline requires capital-intensive processing at refineries. Refining margins — the spread between what refiners pay for crude and what they charge for gasoline — have also increased, as refiners operate closer to capacity and face higher input costs. This typically accounts for 15 to 20 percent of the pump price.
Taxes: Federal and state fuel taxes are fixed costs embedded in every gallon. The federal excise tax is 18.4 cents per gallon. North Carolina’s state gas tax runs approximately 40 cents per gallon. Combined, taxes represent roughly 15 percent of the total retail price and don’t fluctuate with crude prices.
Distribution and retail: Pipeline transport, terminal storage, trucking to retail locations, and the operating costs of the station itself make up the remainder — typically 10 to 15 percent. These costs are relatively stable but can increase when fuel demand spikes and logistics become strained.
Why Domestic Production Doesn’t Insulate Us Completely
The United States is one of the world’s largest crude oil producers, which does provide meaningful insulation from global supply shocks. But it doesn’t make us immune to them, for a structural reason that trips up a lot of people: domestic crude is still priced on global markets.
Oil extracted in the Permian Basin or the Gulf of Mexico is sold at prices benchmarked to WTI or Brent crude — global indices. When those benchmark prices rise because of a supply disruption in the Persian Gulf, American producers can and do charge more for their output as well. The global market sets the floor, and everyone prices off it.
The federal government also maintains the Strategic Petroleum Reserve — a stockpile of crude held in underground salt caverns along the Gulf Coast — specifically for supply emergencies. Releases from the SPR can help moderate price spikes, and the administration has tapped it in recent months. But the reserve has finite capacity and is better suited to bridging short-term gaps than offsetting a prolonged structural disruption.
The Downstream Economic Impact
Elevated energy prices don’t stay contained to the gas station. Fuel is an input cost for virtually every sector of the economy — agriculture, manufacturing, retail logistics, aviation, construction. When diesel prices climb (they’re up nearly 50 percent since the conflict began, according to AAA), the businesses that depend on it typically pass a portion of those costs to consumers through higher prices on goods and services. That’s one of the key mechanisms through which energy shocks feed into broader inflation.
The Energy Secretary recently indicated that gas prices may not fall back below $3 per gallon until next year at the earliest — a signal that the market doesn’t expect a rapid resolution to the supply situation. For households, that means the pressure on discretionary spending is likely to persist through most of 2026.
What You Can Do
You can’t control crude markets or foreign policy, but you can make deliberate choices that reduce your exposure. Consolidating trips, maintaining proper tire pressure (which measurably affects fuel economy), and using price-comparison tools like GasBuddy to identify the cheapest stations in your area all have real dollar impact over time.
From a financial planning perspective, sustained energy cost increases are worth factoring into your household budget review — not as a one-time adjustment, but as a potential new baseline for several months. If you operate a business with significant fuel costs, it’s also worth revisiting whether those expenses are being captured correctly for deduction purposes.
The Bottom Line
Gas prices feel personal because they affect you every week. But the forces driving them are global — interconnected commodity markets, critical shipping infrastructure, and geopolitical events that can reshape supply overnight. The conflict involving Iran and the disruption to the Strait of Hormuz have produced one of the most significant energy supply shocks in modern history, and its effects are showing up directly in what Americans pay to fill their tanks.
Understanding that connection doesn’t make the prices easier to stomach — but it does put you in a better position to plan around them. And if you have questions about how rising costs might affect your tax situation or financial strategy, that’s exactly the kind of conversation we’re here to have.
This article is for informational and educational purposes only. It does not constitute financial, tax, or investment advice. Past market conditions are not indicative of future results. Consult with a qualified financial or tax professional before making decisions based on economic conditions.
Securities offered through Registered Representatives of Cambridge Investment Research, Inc., a Broker/Dealer, Member FINRA/SIPC. Advisory services offered through Cambridge, a Registered Investment Advisor. Sound Foundation Wealth Advisors and Cambridge Investment Research, Inc. are not affiliated
