On September 16, 2026, the U.S. Federal Reserve raised the target range for the federal funds rate by 0.25 percentage point to 3.75–4.00%. A few weeks earlier, on August 26, Thailand’s Monetary Policy Committee had kept the Thai policy rate at 1.00%.
That raises an obvious question: if the Fed matters so much to the world, why does Thailand not need to keep its policy rate close to the U.S. rate?
Because the Fed has a powerful influence on global financial conditions, but it is not a remote control for every central bank. Its effects travel through bond markets, exchange rates, capital flows, expectations and U.S. demand before they meet each country’s own inflation, growth and financial conditions.
What rate does the Fed actually control?
The Fed does not directly set mortgage rates, credit-card rates or deposit rates around the world. Its main policy instrument is the target range for the federal funds rate, a short-term rate at the center of the U.S. money market.
When the target range changes, other short-term U.S. rates usually adjust, and the effects can spread into borrowing costs, asset prices and broader credit conditions. Higher rates tend to restrain spending and investment; lower rates generally loosen financial conditions.
That is the start of monetary-policy transmission inside the United States. But the chain does not stop at the U.S. border.
Why does the Fed carry more global weight than most central banks?
The answer is not simply that the United States is a large economy. The U.S. dollar and U.S. financial markets sit near the center of the global financial system.
The dollar is widely used for cross-border borrowing, investment and transactions, while U.S. Treasury markets are a key benchmark for investors. When expectations for Fed policy change, investors do not only reassess the U.S. economy. They also reconsider which assets to hold, in which countries, and at what required return.
That is why markets care not only about what the Fed does today, but also about what they think it will do next.
How do Fed rates spill over to the rest of the world?
A useful way to think about the spillovers is through three broad channels.
1. The financial channel: yields and the cost of capital
When U.S. rates or Treasury yields rise, U.S. assets can become more attractive relative to assets elsewhere. Global investors may rebalance portfolios, and borrowing costs in other countries can come under upward pressure.
The size of the effect differs across countries. It depends on market depth, dependence on foreign financing, debt structures and the credibility of domestic policy frameworks.
2. The exchange-rate channel: the dollar versus local currencies
If U.S. rates rise more than markets expected—or are expected to stay high for longer—the dollar may receive support. But currencies do not move on interest-rate differentials alone.
Growth expectations, geopolitics, commodity prices, current-account positions and capital flows can all matter at the same time.
For economies with significant dollar-denominated debt, local-currency depreciation can also increase the domestic-currency burden of that debt, making the spillover more painful.
3. The demand channel: how much the U.S. buys from the rest of the world
If tighter monetary policy slows U.S. consumption and investment, demand for imported goods and services may weaken as well.
So the Fed can affect other economies not only through financial markets, but also through trade and demand.
Does that mean other central banks have to follow the Fed?
No.
Each central bank still has to respond to its own inflation, growth, employment, credit conditions, financial stability and exchange-rate environment.
The Fed is therefore an important external force, not an instruction that every other central bank must copy.
Economies with flexible exchange rates, deeper domestic markets and well-anchored inflation expectations usually have more room to run independent policy. Countries with heavy reliance on foreign capital, large dollar liabilities or weaker inflation credibility may face tighter constraints.
How does this reach Thailand?
At its August 26, 2026 meeting, Thailand’s MPC kept the policy rate at 1.00%. The Bank of Thailand said growth remained low and uneven even as the technology and AI cycle provided some support. It also noted that the baht had been volatile because of both Middle East geopolitical developments and shifting expectations about the Fed’s policy path.
That is a useful real-world example of how the link works.
Fed policy changes the external environment facing Thailand, but the MPC still makes its decision based on Thai inflation, growth, credit conditions and financial stability.
That is why the Fed can be at 3.75–4.00% while Thailand’s policy rate is at 1.00% without any contradiction.
A 1% policy rate does not mean your loan rate should be 1%
Another common misunderstanding is to assume that a one-point move in the policy rate should create an immediate one-point move in deposit and lending rates.
Bank of Thailand analysis of the easing cycle from late 2024 through 2025 found that a cumulative 1 percentage point reduction in the policy rate passed through to commercial banks’ reference lending rates by about 57% on average during the period studied. The estimated pass-through was about 56% for MLR and 55% for MRR.
That does not mean future policy changes will always pass through at exactly those rates. It shows that there are important layers between the central bank’s policy rate and the rate a borrower actually pays.
Actual loan rates also depend on borrower credit risk, the type of loan, bank funding costs, competition, risk appetite and contract structure.
Who feels interest-rate changes first?
The effects do not arrive everywhere at once.
Floating-rate borrowers may feel changes before people with long fixed-rate contracts. Depositors may see their returns adjust on a different timetable. Businesses that borrow for equipment or working capital care not only about the interest rate, but also about whether banks are willing to extend credit.
Investors watch bond yields, exchange rates and asset valuations. Importers and exporters can feel the impact through the baht even if they have no direct dollar debt.
That is why an interest-rate move does not create one simple group of winners and losers.
What should you watch if you want to know how much the Fed is affecting Thailand?
Looking at the Fed rate alone is not enough. Useful indicators include:
- market expectations for the future Fed path
- U.S. Treasury yields
- the U.S. dollar
- the baht and Thai government bond yields
- Bank of Thailand policy decisions
- Thai inflation and growth
- deposit and lending rates
- credit growth in the banking system
Expectations matter because financial markets often move before a central-bank meeting. If investors believe the policy path is changing, bond prices, currencies and risky assets can adjust in advance.
The Fed has global influence, but it does not determine everything
A useful analogy is to think of the Fed as a large gravitational force in a connected financial system. Every country has to account for it, but not every country moves in the same direction or at the same speed.
For Thailand, Fed policy can arrive through the dollar, bond yields, capital flows, risk sentiment and global demand. Those external forces then meet Thailand’s own inflation, growth, credit conditions and Bank of Thailand policy.
So the more useful question is not simply, “If the Fed raises rates, does Thailand have to follow?”
It is:
How is the Fed changing global financial conditions, and how exposed is the Thai economy to those conditions at that moment?
