Last Updated on October 14, 2026 by Jeff Tomas
Why can a change in global oil prices eventually change what you pay at a pump in Thailand? The effect moves through several steps: crude oil costs and the baht influence the cost of refined fuel, then taxes, levies, the Oil Fuel Fund, and other price components shape the retail price.
So a rise in crude prices won’t necessarily raise every pump price by the same amount, and gasoline, gasohol, and diesel can respond differently. Here’s how each part of Thailand’s fuel-price structure feeds into the final bill.
Key Takeaways
- Global crude prices affect Thailand’s fuel costs through refined-product prices, while baht depreciation can make imported oil and fuel more expensive.
- The pump price also includes taxes, wholesale and retail margins, VAT, and Oil Fuel Fund adjustments. These parts shape how much of an international price change reaches drivers.
- Gasoline, gasohol, and diesel can respond differently because their tax rates and fund contributions or subsidies vary by fuel type, as Thailand’s fuel-price structure shows.
- As a result, global oil prices matter, but they don’t determine Thai pump prices alone or guarantee an immediate, equal change for every fuel.
How Oil Prices Reach Thailand’s Pumps
The price at a Thai pump begins with international oil markets, but it passes through several pricing steps before reaching drivers. Crude oil, refined fuel, the baht, and Thailand’s domestic price components each affect the final amount.
Crude prices and the baht shape the fuel cost
Thailand’s fuel costs respond to global crude prices because refineries and importers need oil as a feedstock. However, crude is only one part of the calculation. Gasoline and diesel are finished products, and their prices also depend on refined-product markets, which can move differently from crude.
The exchange rate matters, too. When the baht weakens against the currencies used to buy oil and fuel, the same international price can cost more in baht. A stronger baht can ease that local-currency cost, even if the world price stays the same.
As a result, a change in crude prices does not translate directly into an equal change per liter at the pump. The cost of finished fuel, exchange rates, and the rest of Thailand’s pricing structure all shape how much drivers ultimately pay.
Refineries and imports turn oil into pump-ready fuel
Thai refineries process crude into products such as gasoline and diesel, while imports of crude or finished fuel can help meet local demand. Since crude and finished products have separate market prices, the cost of a liter of fuel reflects more than the crude oil used to make it.
Thailand’s Energy Policy and Planning Office (EPPO) publishes an ex-refinery price as a reference point between upstream costs and later price components. For blended fuels, that figure includes the petroleum product and its ethanol or biodiesel blend.
It is a calculated reference under the pricing structure, not necessarily the actual cost a refinery paid for its inputs or the price in a specific transaction. The ERIA review of Thailand’s fuel pricing describes how ex-refinery prices connect to the retail price structure.
After that reference price, taxes, Oil Fuel Fund and conservation-fund items, VAT, and marketing margins contribute to the pump price. Their amounts can vary by fuel type and over time. Therefore, two fuels can respond differently to the same movement in global markets, and changes in crude prices do not automatically produce an immediate, identical change at every pump.
What Makes Up a Liter of Fuel in Thailand?
EPPO’s Bangkok reference price breaks the pump price into market costs, taxes, fund adjustments, and downstream charges. A dated example shows how these parts fit together: on April 2, 2026, EPPO listed H-Diesel at 44.24 baht per liter. That figure is a historical reference, not a current quote.
Taxes and VAT add more than one charge
The calculation starts with the ex-refinery price, then adds excise tax, municipal tax, and any Oil Fuel Fund or conservation-fund adjustment. Excise tax is charged per liter, and the rate varies by fuel type. EPPO lists municipal tax as 10% of the relevant excise tax, so it also changes with the fuel’s excise rate.
For H-Diesel on April 2, the ex-refinery price was 49.228 baht per liter. EPPO listed 6.92 baht in excise tax and 0.692 baht in municipal tax. The Oil Fuel Fund entry was -17.78 baht, a compensation that reduced the calculated price, while the conservation-fund contribution added 0.05 baht. Together, those items brought the wholesale price to 39.11 baht per liter.
EPPO then lists 7% VAT on the wholesale price. For this example, that added about 2.74 baht. A second 7% VAT line applies to the marketing margin, adding about 0.16 baht. You can see the dated figures in EPPO’s April 2 price structure.
These adjustments can matter as much as changes in the underlying fuel cost. In this H-Diesel example, the fund compensation offset much of the combined refinery price and tax charges before VAT and the marketing margin were added.
Wholesale and marketing costs connect the refinery to the station
The wholesale price is EPPO’s subtotal after adding the ex-refinery price, excise tax, municipal tax, Oil Fuel Fund adjustment, and conservation-fund contribution. VAT on wholesale is shown separately. This price captures the fuel’s reference cost before the final marketing component.
The marketing margin is a calculated residual between the retail price, wholesale price, and VAT. It can cover downstream marketing and distribution expenses, as well as returns for oil traders and station operators. It is not a separately reported profit for one company or one gas station. EPPO also lists VAT on this margin as its own line, bringing the example’s calculated total to the 44.24-baht retail reference price.
How the Oil Fuel Fund Can Cushion or Raise Pump Prices
The Oil Fuel Fund can change the retail price calculation without changing the ex-refinery price. Its adjustment may reduce what drivers pay, or add to the price when a fuel contributes money to the fund. Because the rate is set through policy decisions, it does not automatically track crude oil prices.
A diesel example shows the size of the adjustment
In EPPO’s Bangkok price structure dated April 2, 2026, high-speed diesel had an ex-refinery price of 49.228 baht per liter and a listed retail price of 44.24 baht. The Oil Fuel Fund provided compensation of 17.78 baht per liter, offsetting part of the costs added after the refinery price.
B20 shows an even larger adjustment in that dated reference. Its listed retail price was 39.24 baht per liter, with 20.12 baht per liter in Oil Fuel Fund compensation. These figures illustrate how the fund can cushion pump prices while the ex-refinery figure remains unchanged. They are historical reference prices, not current quotes, and the compensation rates should not be treated as permanent. EPPO’s April 2 price structure shows the components used in those calculations.
The sign on the fund adjustment matters. A positive contribution sends money into the fund and adds to that fuel’s price calculation. A negative rate means the fund pays compensation to reduce the price. The Oil Fuel Fund Office’s committee announcements show that rates are set through dated determinations, rather than a fixed formula that moves automatically with global crude prices.
Gasoline blends can follow a different price path
The same April 2 structure listed Gasohol 95 E10 at 43.25 baht per liter, compared with 51.84 baht for regular unleaded 95. That gap reflects several parts of the calculation, not a single fund adjustment.
The fuels have different ex-refinery values, tax amounts, and Oil Fuel Fund rates. Their compositions also differ: E10 contains ethanol, while regular unleaded 95 does not. As a result, a change in international fuel costs or fund policy can affect each retail price differently.
For drivers, the practical point is that the ex-refinery price alone does not predict the pump price. Check the dated fuel-price structure and fund rate for each product, since a subsidy or contribution can change while the underlying refinery figure stays the same.
Why a Global Price Change Does Not Show Up at Every Thai Pump at Once
Global oil prices are only one input in Thailand’s fuel-price structure. Before a market change reaches drivers, refined-fuel costs, exchange rates, taxes, Oil Fuel Fund adjustments, and retailer pricing all shape the result. These components can change at different times, so there is no precise formula that turns a move in crude prices into the same immediate change at every station.
Policy choices and timing can soften or shift a change
The Oil Fuel Fund can offset an increase in underlying costs when it pays compensation, or add to the price when a fuel contributes to the Fund. The rate is set by the Oil Fuel Fund Management Committee, so it reflects a policy decision rather than an automatic response to crude prices.
Timing depends on when those rates and other price components change, as well as when fuel retailers update their prices. The published structure does not set one fixed pass-through timetable. As a result, a global price move may appear at the pump later, by a different amount, or alongside a change in taxes or Fund adjustments that cushions or amplifies it.
Bangkok reference prices are useful, but not every station’s quote
EPPO publishes a Bangkok retail price structure to show how key components fit together. The agency says the calculation is for public reference, not a government-controlled selling price. Its petroleum price statistics also include price information for Thailand, but the Bangkok structure should not be read as a guaranteed quote for every station.
Retailers set station prices under competition, and local prices can differ by operator and location. Therefore, an EPPO reference price helps you understand the calculation, but it does not prove that every pump charges the same amount.
When you see a price change, check the components behind it rather than looking only at the headline crude price. Compare the ex-refinery price, Oil Fuel Fund contribution or compensation, taxes, and marketing margin in dated EPPO structures. That breakdown can show whether a pump-price move tracks fuel costs or reflects a shift in domestic policy and pricing.
Frequently Asked Questions
These answers clarify how to read Thailand’s fuel-price figures and why one pump price may differ from another.
Does crude oil directly set the price shown at Thai fuel stations?
Crude costs influence fuel pricing, but they don’t determine the amount shown at the pump by themselves. The calculation also reflects refined-product values, exchange rates, taxes, Oil Fuel Fund adjustments, wholesale costs, and the marketing margin.
Why can diesel cost less than gasoline when its refinery price is higher?
On April 2, 2026, EPPO listed high-speed diesel’s ex-refinery price at 49.228 baht per liter, above its 44.24-baht reference retail price. A 17.78-baht-per-liter Oil Fuel Fund compensation reduced the diesel calculation, while fuel-specific tax amounts also differed. Together, those adjustments can outweigh a higher refinery figure.
What is the difference between gasoline and Gasohol 95 E10?
Gasohol 95 E10 blends gasoline with 10% ethanol; regular gasoline does not contain that ethanol blend. EPPO’s ex-refinery figure for a blended fuel includes its biofuel content, so the blend alone doesn’t tell you which product will cost less at the pump.
Is EPPO’s published Bangkok price the price every driver pays?
No. EPPO’s Bangkok price structure is a public reference that shows how price components are calculated, not a government-set selling price or a promise that every station nationwide will charge the same amount. Retail prices can vary by seller and location.
Can a stronger baht lower fuel prices in Thailand?
Yes, all else equal, a stronger baht can reduce the local-currency cost of imported oil and fuel. However, refined-product prices, taxes, fund rates, and other policy choices can change too, so a stronger baht doesn’t guarantee a lower pump price.
Where can readers check the parts of a fuel price?
Check EPPO’s fuel-price publications for price structures, then consult the Oil Fuel Fund Office’s dated fund decisions for changes to fund rates. Compare figures from the same date and for the same fuel type, since both can affect the result.
