A country devalues its currency by taking deliberate policy action to push its money’s value down against other currencies. Governments have four main levers for doing this: cutting interest rates, expanding the money supply, selling their own currency on foreign exchange markets, and resetting an official exchange rate peg to a lower number. The mechanisms differ, but the goal is the same. Cheaper local currency makes the country’s exports more competitive abroad and makes imports more expensive at home.
Why a Government Would Want a Weaker Currency
The most common reason is trade. A country running a persistent trade deficit can use a weaker currency to make its exports look cheaper to foreign buyers while making imports pricier for its own consumers, which tends to narrow the gap over time.
Debt is the other big motivator. A government that owes large sums in its own currency benefits when each unit of that currency is worth less, because the real weight of the debt shrinks. The calculus flips when the debt is denominated in a foreign currency like the U.S. dollar. In that case, devaluation makes repayment harder, not easier, because more local currency is needed to buy each dollar of debt service.
Cutting Interest Rates
Central banks steer their currencies partly through the benchmark interest rate. In the United States, the Federal Open Market Committee sets the federal funds rate target, and that rate flows through to Treasury yields, savings accounts, and other fixed-income products.
When a central bank cuts rates, domestic assets pay less. International investors chasing yield start moving capital elsewhere, and to do that they have to sell the local currency for a foreign one. That raises the supply of the local currency on exchange markets and lowers demand for it. Price falls.
The effect scales with the money involved. Pension funds and sovereign wealth funds move hundreds of billions of dollars in response to rate signals, so even a 25-basis-point cut (a quarter of a percentage point) can drive real capital flows once it multiplies across global markets. As of its January 2026 meeting, the Federal Reserve held its target range at 3.5% to 3.75%, and traders price every adjustment in almost immediately.
The trade-off falls on anyone living off interest income. Retirees with savings accounts, money-market funds, and short-term CDs see yields drop. If inflation runs above the new lower rate, their real return goes negative.
Expanding the Money Supply
A central bank can push its currency down by putting more of it into the financial system. The core tool is open market operations: the bank buys government bonds or other securities from commercial banks and pays for them by crediting the banks’ reserve accounts with newly created money.1Federal Reserve Board. Open Market Operations Those reserves give banks more capacity to lend, and lending expands the total money supply.
Done at very large scale, this is called quantitative easing. The Federal Reserve’s balance sheet peaked at roughly $8.96 trillion in April 2022 after years of asset purchases.2Federal Reserve Bank of St. Louis. The Mechanics of Fed Balance Sheet Normalization The underlying logic is simple: more supply of anything, with demand roughly steady, means a lower price per unit. Each unit of currency represents a smaller slice of the economy’s output, and its exchange value drops accordingly.
Most of this money creation happens on central bank ledgers, not at a printing press. The Bureau of Engraving and Printing does manufacture physical Federal Reserve notes, but paper cash is a small fraction of total money in circulation.3Bureau of Engraving & Printing. About BEP
The reverse is quantitative tightening. Instead of buying new bonds, the central bank lets existing holdings mature without reinvesting the proceeds, gradually pulling reserves out of the banking system. The Fed began this process in June 2022, and the balance sheet had dropped to about $8.19 trillion by mid-2023.2Federal Reserve Bank of St. Louis. The Mechanics of Fed Balance Sheet Normalization
Selling the Currency on Foreign Exchange Markets
A central bank can move an exchange rate directly, without touching interest rates or the money supply, by acting as a seller in the foreign exchange market. It sells its own currency and buys foreign currencies or foreign government bonds, creating an artificial surge in the supply of local currency available for trade. When traders see a central bank acting as a persistent large seller, the exchange rate moves down.
In the United States, the legal authority sits in 31 U.S.C. ยง 5302, which established the Exchange Stabilization Fund and authorizes the Secretary of the Treasury, with presidential approval, to deal in gold, foreign exchange, and other financial instruments to stabilize exchange rates.4Office of the Law Revision Counsel. 31 USC 5302 – Stabilizing Exchange Rates and Arrangements The trades themselves run through the Open Market Trading Desk at the Federal Reserve Bank of New York.5Federal Reserve Bank of New York. Permanent Open Market Operations
The volume a central bank can push through the market is often large enough to overwhelm private demand and force the exchange rate where it wants. This method gives immediate, precise control, but it burns through foreign reserves, so it only works as long as those reserves last.
Resetting an Official Peg
Countries that don’t let their currency float freely peg it to a benchmark, usually the U.S. dollar or a basket of major currencies. Devaluation under a pegged system is the most direct of the four methods. The finance ministry or central bank announces a new, lower official rate. A currency pegged at four units per dollar that gets re-pegged at five units per dollar has just been devalued 20% by decree. No market mechanism required.
The government then has to defend the new peg, which usually means selling foreign reserves or adjusting interest rates to keep the market rate near the official one. Developing economies that value the stability of a fixed rate often use this approach, resetting the peg when economic conditions have pulled the currency’s real value too far from the official number.
The Costs of Devaluing
Every benefit of devaluation comes with a cost, and some of those costs can be severe.
More Expensive Imports and Higher Inflation
If exports get cheaper for foreign buyers, imports get more expensive for domestic ones. Every barrel of oil, container of electronics, and ton of raw materials priced in foreign currency costs more in local terms after a devaluation. The U.S. Bureau of Labor Statistics has documented the relationship: currency depreciation feeds through to higher import prices, appreciation pushes them down.6U.S. Bureau of Labor Statistics. How Currency Appreciation Can Impact Prices: The Rise of the U.S. Dollar Pass-through isn’t complete. Research suggests that for U.S. imports, roughly 20% of an exchange rate move shows up in import prices, down from over 50% in earlier decades.
The J-Curve
Even when devaluation eventually helps the trade balance, the first stretch usually looks worse, not better. Economists call the pattern the J-curve. Existing import contracts are priced in foreign currency, so the same volume of imports suddenly costs more in local terms right after devaluation. Export volumes, meanwhile, take time to rise, because foreign buyers need to notice the new price advantage and shift their orders. The trade balance typically takes one to two years to work through the curve.
Foreign-Denominated Debt Gets Heavier
Countries that borrowed in dollars, euros, or yen face a dangerous feedback loop. Devaluation raises the local-currency cost of every unit of foreign debt they owe. IMF research has found that real exchange rate depreciation increases the burden of foreign-currency debt service and can raise default probability, sometimes triggering the default itself.7IMF. Sovereign Defaults, External Debt, and Real Exchange Rate Dynamics Once a sovereign defaults, the economic damage tends to weaken the currency further.
Retaliation From Trading Partners
Deliberate devaluation can invite pushback. In the 1930s, multiple countries abandoned the gold standard and devalued in sequence, each trying to export its way out of depression at the others’ expense. Global trade collapsed. Modern rules, particularly the IMF Article IV obligations that prohibit manipulating exchange rates to gain unfair competitive advantage, exist to prevent that spiral. Today’s retaliation tends to come in the form of tariffs rather than counter-devaluations, but the risk of escalation is real.
How the U.S. Watches for Manipulation Abroad
Devaluation by a country’s own government is a policy choice. When another country does it in ways the U.S. considers unfair, that’s manipulation, and Treasury has a formal process for tracking it. Twice a year, Treasury reports to Congress on the exchange rate practices of major trading partners under criteria from the Omnibus Trade and Competitiveness Act of 1988 and the Trade Facilitation and Trade Enforcement Act of 2015.
Under the 2015 law, a country lands on Treasury’s Monitoring List if it meets two of three thresholds:
- A bilateral goods and services surplus with the U.S. of at least $15 billion.
- A current account surplus of at least 3% of the country’s GDP.
- Net purchases of foreign currency in at least 8 of the past 12 months, totaling at least 2% of GDP.
Meeting all three brings enhanced engagement from Treasury and potential consequences under the 1988 Act, which asks the broader question of whether a country is manipulating its exchange rate to prevent balance-of-payments adjustment or to gain unfair trade advantage. In the January 2026 report, Treasury found that no major trading partner met all three criteria during the period assessed.8Treasury.gov. Macroeconomic and Foreign Exchange Policies of Major Trading Partners of the United States – January 2026 Report to Congress
Being labeled a manipulator carries more than diplomatic weight. It can trigger negotiations, trade penalties, and restricted access to U.S. government procurement contracts, which is why the framework works as a deterrent against the most aggressive forms of currency intervention.