Educational content. This article explains why emerging market currencies have tended to weaken when US yields rise, and how that shows up in CFD trading on the MT5 platform. It does not constitute investment advice or a recommendation. CFD trading carries significant risk of loss and may not be suitable for all investors.
Emerging market currencies tend to fall when US yields rise because a higher US yield makes dollar assets pay more relative to emerging currency assets, and because it raises the risk premium on emerging assets. In the 2013 taper tantrum the 10-year US yield rose 137 basis points and the dollar gained 8.8 percent against emerging currencies.
The pattern is a tendency, not a law. This article separates the two channels behind it, shows where it appears in the Vanto feed, works through the position arithmetic, and explains when the link fails.
What Does "US Yields Rise" Mean for Another Currency?
A rise in US yields means the return on US government bonds goes up, usually measured on the 10-year Treasury, and it raises the reward for holding dollars relative to other currencies. A yield is the annual return an investor earns on a bond at its current price. Because Treasuries are the benchmark that other bonds are priced against, a higher US yield pulls capital toward dollar assets unless the other currency offers more.
An emerging market (EM) currency is the currency of a country with a developing financial system, such as the Mexican peso, the South African rand or the Chinese yuan. EM governments usually have to pay a higher yield than the United States to attract the same investors. That extra yield is the reason foreign investors hold the currency at all. When the US yield rises and the EM yield does not rise by the same amount, the extra shrinks.
So the question is never only "what did US yields do". It is "what did the gap between the two yields do, and what did investors think about the risk of holding the lower-rated side of it".
Why Do Emerging Market Currencies Fall? The Two Channels
Emerging market currencies fall for two separate reasons: the gap that pays the holder narrows, and the price of risk goes up. The Federal Reserve's 2023 FEDS Note on US interest rates and emerging market currencies calls these the interest-rate channel and the risk channel, and it treats them separately because they do not always move together (source: Federal Reserve Board, FEDS Notes, 4 October 2023).
The Interest-Rate Channel: The Yield Gap Narrows
The interest-rate channel works through the yield gap, and it is the carry trade seen from the other side. A carry trade holds a higher-yielding currency against a lower-yielding one and collects the difference. The mechanism is explained in the carry trade explained.
If the US yield rises and the EM yield stays put, three things follow:
- The carry on the EM currency is smaller. The reward for holding it fell, so fewer investors want to hold it at the old price.
- New money has a better home. A global bond fund can now get more from US bonds with less risk, so it sells EM bonds and the currency they are denominated in.
- Existing carry positions are less profitable. Some of them close, and closing a carry position means buying dollars and selling the EM currency.
The currency has to fall until holding it is attractive again. In practice that means the EM currency must be expected to recover, or be cheap enough to offset the lower yield.
The Risk Channel: The Premium Rises
The risk channel works through the price of risk, and it often matters more than the gap itself. Higher US yields tighten financial conditions across the world. That raises the cost of refinancing debt, and debt owed in dollars becomes harder to carry when the dollar is rising. Investors who price that risk demand a higher return from EM assets, which means a lower price for the currency now.
Three mechanisms sit behind the risk channel:
- Dollar debt. Many EM companies and governments owe money in dollars while earning in local currency. A weaker local currency raises the real burden of that debt, which is a reason to sell the currency before the burden shows up. This is the same borrower-side effect described in why the US dollar rises when stocks fall.
- Funding for imports. Countries that run a current-account deficit need foreign capital to pay for what they import. Higher US yields make that capital more expensive and less available.
- Leverage elsewhere. Positions funded in dollars get closed when dollar funding costs rise, and that selling hits whichever markets were most crowded.
The Fed's note studied eight episodes, and in the four driven by negative growth or risk shocks it found that the risk premium channel strongly dominated movements in EM currencies. It also found that the vulnerability of the country mattered: a vulnerability score based on fundamentals was positively correlated with depreciation in almost all episodes.
Where Does the Carry Show Up in the Vanto Feed?
The feed shows which currencies are carry destinations through the sign of the overnight swap. This is a structural fact about direction, not a rate: the size of any swap changes with central-bank policy and is not quoted here. See what is swap in trading for the mechanism.
The table lists every US-dollar pair with an emerging or Asian currency in the Vanto feed, plus EUR/USD as the major-pair reference.
| Pair | Long position swap | Short position swap | What the sign suggests |
|---|---|---|---|
| USD/MXN | Negative | Positive | Peso side carries the higher rate |
| USD/ZAR | Negative | Positive | Rand side carries the higher rate |
| USD/CNH | Positive | Negative | Dollar side carries the higher rate |
| USD/HKD | Positive | Negative | Dollar side carries the higher rate |
| USD/SGD | Positive | Negative | Dollar side carries the higher rate |
| EUR/USD | Negative | Positive | Dollar side carries the lower rate |
Source: Vanto feed snapshot, 10 October 2026. Signs only; amounts are not stated. A swap sign also includes the broker's financing adjustment, so it is an indication of the rate gap and not a measurement of it.
The table has two lessons. First, the signs split the emerging currencies into two groups. The peso and the rand pay a holder of the currency, which is why they are classic carry destinations and why they are the ones exposed to a narrowing gap. The yuan, Hong Kong dollar and Singapore dollar sit on the other side of the dollar, so a long dollar position earns the swap. Second, the table shows that "emerging market" is not one trade. A currency that is itself a funding currency does not lose its carry when US yields rise, because it has none to lose.
The sign is the useful part. A trader who sees a negative swap on a long USD/MXN position can read it as the market saying that the peso carries a higher yield than the dollar, and that the position holding the dollar pays for that.
What Does a US Yield Move Do to a Position? Worked Examples
The effect on a CFD position is the move in the exchange rate multiplied by the position size, and the examples below use the figures that apply to every USD-base pair at Vanto. The contract size is 100,000 units of the base currency per lot (Vanto feed snapshot, 10 October 2026), and margin at the 1:500 forex cap is the notional divided by 500. Margin call is 100% and stop-out is 50% on both account types. Read what is leverage in trading and what is margin in trading for the definitions.
Example 1: One Lot and a 1 Percent Move
Margin for one lot of USD/MXN is USD 100,000 / 500 = USD 200. A 1 percent move in the pair changes the notional value of the position by USD 100,000 x 0.01 = USD 1,000. A trader long USD/MXN gains USD 1,000 if the pair rises 1 percent (the peso weakens) and loses USD 1,000 if it falls 1 percent. A short position is the mirror image. A move of that size is roughly five times the margin held, which is why leverage amplifies losses as well as gains.
Example 2: The Fed's Taper-Tantrum Average on a Small Position
Applying a basket figure to one pair is a rough exercise, so treat the result as an order of magnitude and not as what any pair did. The Fed note reports a dollar gain of 8.8 percent against EM currencies in the taper tantrum. On a 0.10 lot (notional USD 10,000), 8.8 percent is USD 10,000 x 0.088 = USD 880. The margin on 0.10 lot is USD 10,000 / 500 = USD 20.
A long dollar position would have gained USD 880 on that average. A short dollar position, for example a trader who held a peso carry by being short USD/MXN, would have lost the same USD 880, which is 44 times the USD 20 of margin. The same 8.8 percent also illustrates why a 1:500 cap is a ceiling and not a target: the account has to survive the move against it.
Example 3: What a Narrower Yield Gap Does to Compensation
Carry has to be weighed against the currency's volatility. The numbers here are hypothetical and chosen for the arithmetic only. Suppose the policy-rate gap between an EM currency and the dollar is 5 percentage points a year, and the currency's annualised volatility is 12 percent. The carry-to-volatility ratio is 5 / 12 = 0.42. If US rates rise by 1 point and the EM rate does not, the gap becomes 4 points and the ratio becomes 4 / 12 = 0.33, a fall of 20 percent in how much the holder is paid per unit of risk.
Now suppose volatility also rises to 15 percent, which is typical when yields move sharply. The ratio drops to 4 / 15 = 0.27. The holder is paid 36 percent less per unit of risk than before (0.27 against 0.42), although the headline gap shrank by only 20 percent. That is the two channels working together, and it is why the currency can move further than the gap alone explains.
How Do the Two Channels Compare?
The two channels differ in what causes them, how fast they act and what stops them. The table summarises the difference.
| Interest-rate channel | Risk channel | |
|---|---|---|
| What changes | The yield gap between the two currencies | The premium investors demand for holding EM assets |
| Typical trigger | Fed signals higher rates; inflation surprise | Growth scare; tighter dollar funding; crowded positions unwinding |
| Direction of US yields | Rise | Rise or fall |
| Who is hit first | Carry holders and bond funds | Countries with dollar debt and current-account deficits |
| What stops it | EM central bank raises its own rate | Calmer volatility and stable funding |
Source: framework from the Federal Reserve Board FEDS Note, 4 October 2023; table layout by Vanto.
Is the Relationship the Same Every Time? Two Episodes
The relationship is not constant, because it depends on the shock behind the yield move. The Fed note compares episodes in which yields rose for different reasons, and two of them show the range.
2013: A Monetary Shock
In the 2013 taper tantrum the interest-rate channel was strong and the risk channel modest. Expectations that the Fed would slow its asset purchases pushed the 10-year Treasury yield up by 137 basis points between early May and early September 2013, and the dollar rose 8.8 percent against EM currencies. The note reports a rise of only 2 points in the VIX and 16 basis points in high-yield spreads, so the market was not in a broad risk-off panic.
The note adds that the Fed's own communication was largely consistent with what analysts expected, yet the reaction was still large. Before the episode the federal funds rate had been near zero since late 2008, and the note reports that a carry strategy long EM currencies had provided a cumulative return of about 28 percent from the end of 2008 through April 2013. When many investors hold the same carry position in a calm market, even an expected move can push them to close it at the same moment. The note states it was the only event in which carry return and positioning both had a significant positive correlation with depreciation.
2022: A Monetary Shock With a Wider Risk Reaction
In 2022 the picture changed. Over the episode the note dates from 8 June to 12 October 2022, the 10-year yield rose 87 basis points (the federal funds rate rose 300 basis points from early June to early November), the dollar rose 11.4 percent against EM currencies, and the VIX rose 10 points. High-yield spreads widened 94 basis points, and commodity prices fell 15.7 percent.
One difference stands out. The risk channel mattered more than in 2013, because volatility, spreads and commodity prices moved far more: the VIX rose 10 points against 2, high-yield spreads widened 94 basis points against 16, and commodity prices fell 15.7 percent against 1.4 percent. A currency tied to commodity exports can lose twice: once to the rate channel and once to the price of what it sells.
When Does the Relationship Break?
The relationship breaks when US yields and EM currencies are pushed by different forces. There are four common cases.
- Yields rise because growth is strong. A growth surprise can lift US yields and also lift world demand, which supports EM exports. The risk channel may be mild and the currency may hold up.
- Yields fall and the EM currency falls anyway. The Fed note says that in episodes driven by negative growth or risk shocks, the two channels push in opposite directions: yields may fall while EM currencies still weaken because investors demand a higher risk premium. The note states that in those episodes the risk channel overwhelms the interest-rate channel. A trader who reads "lower US yields, so a weaker dollar and a stronger peso" gets the direction wrong in a risk-off move.
- The EM central bank moves first. If the EM central bank raises its own rate ahead of the move, the gap does not shrink. The currency may hold even as US yields climb.
- The country is not vulnerable. The note found that fundamentals matter. A country with a current-account surplus, modest dollar debt and large reserves is less exposed than one without them, which is why a basket average hides large differences between currencies.
A related break appears on the other side of the table. A pair whose long position earns the swap, such as USD/CNH in the feed, is not a carry destination. For that pair a rising US yield widens the gap in the dollar's favour, which is a different mechanism from the peso or the rand. The yuan is also managed closely by its authorities, so market forces do not act on it in the same way. See CNY vs CNH: the offshore yuan for how the offshore rate works.
What Are the Common Mistakes When Reading This Link?
The common mistakes treat a tendency as a rule, and each one has a specific fix.
- Treating all EM currencies as one trade. The swap signs above show the group splits. The peso and the rand pay holders of the currency; the yuan does not.
- Reading US yields without the reason. A yield rise caused by a hawkish Fed and a rise caused by a growth scare have opposite effects on the risk channel. The reason matters as much as the size.
- Ignoring the pip value. One pip is 10 units of the quote currency per lot. At the snapshot that is about USD 0.54 on USD/MXN, USD 0.61 on USD/ZAR and USD 1.49 on USD/CNH, against USD 10.00 on EUR/USD. Sizing by pips instead of by money misstates the risk by an order of magnitude (Vanto feed snapshot, 10 October 2026). Use the pip value for every forex pair at Vanto table or the calculator.
- Forgetting that the cost of holding is part of the trade. Pairs that pay a negative swap on one side and carry a wider spread than a major cost more to hold overnight. The decomposition is covered in why exotic currency pairs cost more to hold overnight, and the triple-swap day for every forex pair in the feed is Wednesday.
- Sizing for the average and not for the tail. The 8.8 percent and 11.4 percent figures are averages across baskets over months. A single pair can move more, and in a shorter time, especially around a Fed decision. Read how FOMC meetings affect the US dollar for the event calendar.
What Should a Trader Check Before Holding an EM Pair?
A trader can check four things before holding an emerging currency pair, none of which depends on a forecast. First, check the swap sign for the direction you hold, because it tells you which side of the carry you are on. Second, check what the pair's pip value is in your account currency. Third, check margin and the distance to stop-out for a move of several percent, using the arithmetic from Example 1. Fourth, check the scheduled US events in the economic calendar, such as CPI, jobs data and Fed decisions, because these are the dates on which US yields move. The wider risk-sentiment context is in what is risk-on and risk-off.
Frequently Asked Questions
Why do emerging market currencies weaken when the Fed raises rates?
Emerging market currencies weaken because a higher Fed rate shrinks the yield advantage that attracted investors and raises the premium for holding riskier assets. Investors move money toward dollar assets that now pay more. The Federal Reserve found the effect depends on whether the rate rise is a monetary shock or a growth shock.
What is the taper tantrum?
The taper tantrum was the 2013 sell-off in bonds and emerging market currencies after the Fed signalled it might slow its asset purchases. According to a Federal Reserve note, the 10-year Treasury yield rose 137 basis points and the dollar rose 8.8 percent against EM currencies between May and September 2013.
Do emerging market currencies fall when US yields fall too?
They can. In episodes driven by negative growth or risk shocks, the Fed note found that yields may fall while EM currencies still weaken, because investors demand a higher risk premium. In those cases the risk channel overwhelms the interest-rate channel, so lower US yields do not guarantee a stronger EM currency.
Does a negative swap on a long USD/MXN position mean the peso is stronger?
No, a negative swap means the peso carries a higher interest rate than the dollar, not that it is stronger. At Vanto a long USD/MXN position pays swap and a short position earns it (feed snapshot, 10 October 2026), because the long position holds the lower-yielding dollar. The exchange rate can still move either way.
Is USD/CNH affected the same way as USD/MXN?
Not in the same way. In the Vanto feed a long USD/CNH position earns the swap and a long USD/MXN position pays it, so the yuan is not a carry destination against the dollar. The mechanism of a narrowing carry applies to the peso and the rand, not to a currency that is itself on the funding side.
How much does a 1 percent move in USD/MXN change a position?
One lot of USD/MXN has a notional value of USD 100,000, so a 1 percent move changes the position by USD 1,000, against USD 200 of margin at 1:500. A 0.10 lot changes by USD 100 for the same move. Leverage amplifies losses as well as gains, so the margin is not the limit of the loss.
Calculate the Numbers for Your Own Positions
The trading calculator computes margin, pip value and swap for USD/MXN, USD/ZAR and the other pairs at the live feed price. For the pair itself, how to trade USD/MXN covers the peso's specific drivers, and how to trade USD/JPY shows the mirror case, a funding currency whose long position earns the swap.
Risk warning. Trading securities, futures, options, and contracts for differences are complex financial instruments that require knowledge and understanding. Prices can fluctuate significantly and securities may become valueless. Investors may incur losses exceeding the potential for profits. Trading on margin can result in losses greater than the amount initially deposited. Past performance is not necessarily a guide to future performance. The information in this article is for educational purposes only and does not constitute investment advice, a recommendation, or an offer to buy or sell any financial instrument. Consider whether CFD trading is appropriate for your circumstances and seek independent advice if necessary.