There are several things that make carry trading interesting:
- It produces real cash flows
- It’s less time consuming than day trading
- It can be lower risk than other strategies
Yet this worthy strategy is often overlooked in favor of ones that might deliver quick profits.
Interest rates are one of the biggest drivers behind currency movements. And one of the main reasons for this is the carry trade. Put simply, carry trading is a strategy for profiting from the difference in interest rates between two currencies. That means “cheap money” is borrowed, converted and lent out at a higher rate of return.
How Currency “Carry Trading” Works
To properly understand the carry trade, we first need to look at what’s actually going on when a trade is executed in the spot forex market.
The spot market simply means for immediate delivery as opposed to delivery on a future date. When you enter into a trade, you in effect buy one currency and sell another for a given contract size, at the current exchange rate.
However, as most forex trading is speculative and done with borrowed money, it’s more appropriate to think of one currency being borrowed, and the other lent.
Just like when you go to a high street bank, when you borrow or lend money, interest payments are due. It’s no different in forex.
The basic aim of the carry trade is to borrow a currency with a low interest, and lend a currency with a higher interest. This results in a positive interest rate flow. Any due interest is paid to the trader – for as long as the position remains open.
This strategy can be very rewarding because interest is paid on the full amount of the contract. Since most forex traders use leverage, the carry trade can offer a substantial income yield. Though, this isn’t without risks (see below).
How To Choose A Currency Pair
In the last decade or so, the low interest currencies favored by carry traders have been the Swiss Franc (CHF) and Japanese Yen (JPY). Popular higher yielding currencies are the Australian Dollar (AUD) and New Zealand Dollar (NZD).
Let’s assume for this example that the base interest rate of the Australian Dollar is 2.5%. While the base rate of Japanese Yen is 0.1%. This means there’s a gross interest rate difference of 2.4%.
Now take a look at the cash flows in two opposing trades in AUD/JPY after one full day.
|Buy AUD/JPY||AUD||JPY||Sell AUD/JPY||AUD||JPY|
|Contract size||$100,000||-¥9,250,000||Contract size||-$100,000||¥9,250,000|
|Gross interest||$6.85||-¥25.34||Gross interest||-$6.85||¥25.34|
|Net interest||$6.04||-¥100.10||Net interest||-$7.66||-¥49.42|
|Net interest (AUD)||$6.04||-$1.08||Net interest (AUD)||-$7.66||-$0.53|
|Net interest (pips)||0.559||-0.100||Net interest (pips)||-0.708||-0.049|
Table 1: Cash flows in long/short carry trade example.
When we buy AUD/JPY, what we are doing in effect is borrowing Yen, and lending Australian dollars. With one standard lot, and the current exchange rate, this means we borrow ¥9,250,000 at an interest rate of 0.1% and lend the exact equivalent which is AUD$100,000 at a rate of 2.5%.
The gross interest rate in Table 4‑1 is the rate before the swap spread is applied. Below I explain how this is calculated. Notice that after applying the spread, the net interest paid on the short side is much higher than that gained on the long side. While beforehand (gross) it was identical.
After holding the position overnight, we are “owed” $6.04 from the lent Australian Dollars. And we owe $1.08 from the borrowed Japanese Yen. This is once the interest rate spread (the fee) has been included.
So the long side would give us a net daily cash flow of $4.96.
When we sell AUD/JPY the reverse happens. We must pay interest on the AUD, and we receive interest on the JPY deposit. But, the small credit interest on the Yen deposit becomes negative once the spread is included.
This means we must pay $8.19 per day to hold the short AUD/JPY position.
It’s important to note, these amounts are fixed overnight. The rate on any day will depend on the prevailing interest rates and fees charged both by the broker and the dealing bank (see below).
AUD/JPY “Buy-and-Hold” Example
Table 2 below shows the profit/loss statement for a long-term buy and hold carry trade. The amounts shown are for a long AUD/JPY position of size one standard lot. The table shows what would happen if this trade were opened at the beginning of 2004, and held for ten years.
|Year||Net Interest||Income||Exchange P/L||Total P/L|
Table 2: Long term returns in a 10-year carry trade.
The trade results in a net income of $38,013 in interest payments. The exchange rate gain over this period is $12,941. In this case, the payment stream from the carry interest more than compensates for the drawdown of the trade. The biggest being after the 2008 Lehman Brothers collapse – see Figure 1.
Even with a conservative 10x leverage, which would easily cover the position, this gives a total return of 509% and an annualized return of nearly 19.8% over a ten year period.
Not a bad return at all when compared to other investments over the same time period.
Carry Trade Strategies
The basic carry trade strategies are:
- Buy and hold – one or more positions are held for the long term.
- Tactical – short term trades are placed for positive carry income.
- Hedged – exchange rate risk is reduced or eliminated altogether.
If you’re planning on using a carry trade strategy, the first step is to find the most profitable combination of broker vs. currency pair.
Charges vary enormously among brokers, and across different currencies. So it’s essential to check that your planned trade actually offers the best risk adjusted return.
Don’t assume that carry trading will be profitable in every case. It might look that way at first glance. With some brokers, the interest spreads are so wide that they can make carry trades unviable.
The table below shows the top carry trade opportunities at the present time (see full table).
|Carry Trade||Broker Average||Highest Yield||Daily Income|
|As of: Sep 2020|
Table 3: Most profitable carry trade opportunities.
When setting up a carry trade, interest yield isn’t the only aspect to consider. If you’re planning on using a buy and hold system, it’s sensible to look at a long-term view on the pair too.
Some “exotics” may offer very high carry rates. Yet these currencies are often highly volatile and depreciate over time due to rampant inflation and other factors.
The interest payments can provide a steady income stream in a carry trading setup. But the trader still has an exchange rate risk. That is, the risk that the currency exchange rate will change and cause a substantial loss on the trade. For this reason many carry traders implement a hedging strategy to protect them against these losses.
Of course, the rate can move in favor of the trade and that would increase the profit to the trader when there is no hedge.
What Influences Carry Currencies?
Real interest rates (adjusted for inflation) are one of the main drivers behind currency movements.
For this reason, currency pairs with carry opportunities often trend strongly in the direction of the interest rate differential. Trending can take place over very long periods of time when the economic backdrop is good and the interest rate expectations are upwards.
The main risk however is that higher yielding currencies are prone to steep and sudden sell-offs when the economic outlook changes or at times of extreme risk aversion.
These sell-offs are known as carry trade liquidation. When you have severe and sudden risk-avoidance, they can quickly turn into full-blown routs. Panic trading sets in and traders all look to unwind their positions at the same time.
Also, keep in mind that movement in carry trade currencies tends to be driven by the same fundamental reasons. What this means is that brutal crashes often impact all carry currencies in lock-step. Because of this, diversification across several pairs doesn’t help in most instances.
Figure 2 shows the massive liquidation of carry trades shortly before the Lehman Brothers collapse. This is followed by successive interest rate cuts due to the economic recession.
Carry Trade Profitability: Swaps, Rollovers, Yields
Just like when you lend or borrow from a high street bank, there’s a fee to pay. This is called the interest rate margin or spread. The dealing bank(s) plus the broker all add their fees into the mix.
This is why it’s important to understand the costs of carry trading and check what you’re actually being charged.
Most brokers do publicize their interest rate spreads on their websites. These are usually listed under rollover/swap charges.
It’s always good practice though to calculate the spread yourself to make sure there aren’t any “hidden extras”. This way, you’ll know the exact yield you’ll achieve with the trade. This is what you should always do before committing to any big carry trade positions.
What Is Rollover?
In the spot forex market, the convention is that settlement takes place two business days after the trade is booked. This is known as the value date. At that point, both parties would exchanges their currencies under the terms of the foreign exchange contract.
However as the majority of forex traders don’t want to take delivery of a currency, brokers typically deal on a “rolling spot” basis. This means any positions left open overnight are automatically rolled forward to the next value date. With “rolling spot”, delivery is postponed indefinitely.
The rollover time varies from broker to broker. Most use the end of the New York session (5.00pm EST, or 10pm GMT) as the cut-off point. Any trade that’s left open after this point is automatically rolled-forward to the next value date.
As the value date cannot occur over a weekend, this means positions left open Wednesday to Thursday must have their value date rolled forward over the weekend, to the following Monday.
This means two additional interest days are added –because interest still accrues over the weekend even though the market is closed.
What is a Swap?
At rollover the trade parties have to settle any interest payments due. This is done via a swap agreement between the counterparties. This forms part of the foreign exchange contract.
The dealing bank will typically use an overnight rate such as Libor plus a spread to fix the interest amounts that are due. Bigger and more creditworthy brokers can demand a better rate. The arranging broker and intermediaries may then add their own mark-up as well.
The difference between the long/short swap values is the rollover– or swap spread. This is your carry trading cost.
How to Calculate Your Net Interest Yield
To calculate the spread for any pair do the following. Using a demo account, open two long/short test trades in your chosen currency. Leave the trades open overnight. If you do this Wednesday-Thursday, this counts as 3 days. The next day, check the swap/rollover amount which should show the interest paid and received on each of the two trades.
Now add the two numbers together and divide by two. The amounts will usually be shown in your account currency. To find the spread as a percentage, just convert the swap values into the trade’s base currency and divide by your lot size.
In the example in Table 1 above, the 1-day swap values on the long/short side where $4.96 and -$8.19. These were the net interest payments (in AUD). This gives:
Long side: net interest = $4.96 x 365 / 100,000 = 1.81%
Short side: net interest = -$8.19 x 365 / 100,000 = -2.99%
Spread % = (1/2) x ($4.96-$8.19) x 365 / 100,000 = -0.59%
So our net yield on the long side would be 1.81%, while the net yield on the short side would be minus 2.99%. The total spread being charged is 0.59%.
I’ve used 365 days for simplicity above, but your broker may use a different day count convention, e.g. 360 days.
Checking Swap Rates using MetaTrader
If you use MetaTrader, you can easily check the swap rates by right clicking in the “Market Watch” window. Select your chosen currency pair, and then click on properties. The long/short swap values are given there – usually in points.
You’ll need to convert this to the base currency using your account settings. You can then use the above calculation to find the spread % and your net yield.
Comparing Broker Rollover Fees
Traders often overlook rollover fees when comparing brokers. Yet for some trading styles these fees can add up to a significant amount over time – especially when the account uses high leverage.
If you’re a day trader and always close positions intraday, then you should be able to avoid rollover charges altogether. If you trade intraday, make sure you’re not using one of the brokers that charges interest continuously (second by second, or hour by hour).
If your trading strategy is equally long/short and you’re not “carry trading”, the interest rates will net out to zero over time. What’s left is the interest rate spread. So it’s important to check, and factor it into your overall trading costs.
For example, if your broker’s interest rate spread is 0.5% and your average overnight holding is 1 standard lot, this means over the course of one year, your rollover fees will be 0.5% x 100,000 = $500.
If you’re trading on high leverage, rollover can represent a significant fee in proportion to the account size.
Table 4 below shows the swap fees applied by some leading brokers. Oanda doesn’t apply overnight interest. Instead it’s calculated second by second as a position is held. On average, the fee is comparable with other brokers. But, this is bad news if you’re a day trader. With an overnight rollover system you wouldn’t pay any interest at all.
|Broker||Rollover||Spread %||Yearly Fee/Lot|
|As of: Sep 2020|
Table 4: Comparison of average rollover fees in pips and percent.
Another thing to watch out for is that some brokers apply higher spreads for different account types. A higher tier of charges may be applied to those who’re trading on high leverage accounts –or using other potentially risky trading tactics. The higher fees are to offset the additional credit risk carried by the broker.
The different rollover treatments means there would potentially be arbitrage opportunities between brokers if the interest rates where to go high enough.
Carry trading can be a profitable long-term strategy when managed correctly. It can provide a steady income stream. And this can cushion the impact of exchange rate losses on the trade itself. Hedging systems can also be put in place to manage and mitigate the exchange rate risks.
The Excel sheets below are used for carry trading and will do the calculations for you. Just enter your currency details and swap values.
|Carry trade calculator (Excel)|
|Cash and carry calculator (Excel)|
There’s also a Metatrader tool if you’re using that platform.