Swap Fees in Trading: Hidden Costs Traders Need to Know

Swap is the Hidden Cost for Overnight Holders

For traders, the world of costs doesn’t end with Spread or Commission. Many traders overlook Swap costs, causing them to lose money unknowingly. Swap is the cost associated with holding a position overnight (Overnight Position), which may be small daily but can accumulate significantly over weeks or months, eating into profits.

Understanding the mechanism of swap costs is essential for anyone who wants to trade smartly.

Origin of Swap: Interest Rate Differentials and Broker Roles

Borrowing and Currency Interest Rates

When trading EUR/USD, you’re not just “buying” and “selling” in a literal sense. In practice, you’re “borrowing” one currency to buy another:

• Open Long (Buy) EUR/USD: You “buy” EUR but also “borrow” USD
• Open Short (Sell) EUR/USD: You “borrow” EUR but “hold” USD

Every currency in the world has its own policy interest rate. For example, the Fed sets the rate for USD, ECB for EUR, etc. Therefore, swap is the net difference between the interest you pay and receive.

Numerical Example:

• EUR has a policy rate of 4.0% per year
• USD has a rate of 5.0% per year

If you Buy EUR/USD:

• You earn EUR interest: +4.0%
• You pay USD interest: -5.0%
• Net difference: -1.0% per year (You get negative swap)

If you Sell EUR/USD:

• You pay EUR interest: -4.0%
• You receive USD interest: +5.0%
• Net difference: +1.0% per year (You get positive swap)

Why do most traders lose?

The theory suggests you should earn +1.0%, but in reality? Brokers act as intermediaries in this borrowing process. They add their own “management fee” or “markup,” which makes the swap you receive much less or sometimes negative on both sides.

This is why Swap Long and Swap Short are usually not equal.

Swap Structure: Long, Short, and 3-Day Swap

Swap Long and Swap Short

Brokers specify different swap rates for buying (Long) and selling (Short):

• Swap Long: Swap rate for Buy orders
• Swap Short: Swap rate for Sell orders

Both are often negative, but their magnitudes differ.

The 3-Day Swap Phenomenon: Why is one day charged 3 times?

Many traders miss this detail. Normally, swap is calculated once per day, but there is one day in the week when it is charged 3 times:

Technical reason: The Forex market closes on Saturday-Sunday, but global interest rates move daily. Brokers must accumulate the swap costs for the weekend into the next trading day.

Generally, this day is Wednesday night (for holding from Wednesday to Thursday), due to the T+2 settlement cycle in Forex:

• Trade on Wednesday → settle on Friday → if holding over the weekend → broker accumulates 3 days’ interest on Wednesday night

However, some brokers may use other days depending on their policies.

Swap Costs in Other Asset Types

Swap costs are not limited to Forex:

CFD Stocks and Indices: Swap is based on the interest rates of the traded currency (e.g., US stocks use USD) minus broker fees

CFD Commodities: Usually more complex, based on storage costs (Storage Costs) or rollover of futures contracts

CFD Cryptocurrencies: Based on the Funding Rate of the exchange market, which is highly volatile and changes hourly

How to Access Swap Data Before Trading

On Standard Platforms (MT4/MT5)

1. Go to the Market Watch window
2. Right-click on the asset (e.g., EUR/USD)
3. Select Specification
4. A new window will display Swap Long and Swap Short
5. The figures are in Points, which need to be converted accordingly

On Modern Platforms

Newer trading platforms often display this information more clearly, usually as a percentage per night (e.g., -0.008% per night), making calculations easier

How to Calculate Swap Costs Accurately

Method 1: Calculating from Points (MT4/MT5)

Formula: Swap in money = (Swap Rate in Points) × (Value of 1 Point)

Example:

• Trading 1 Lot EUR/USD
• Swap Long = -8.5 Points
• For EUR/USD, 1 Pip (10 Points) = (USD)
• Therefore, 1 Point = $10 USD$1
• Calculation: (-8.5) × ($1) = -$8.50 USD per night
• 3-Day Swap: (-$8.50) × 3 = -$25.50 USD

Method 2: Calculating from Percentage per Night

Formula: Swap in money = (Total position value) × (Swap rate %)

Total position value = (Lot) × (Contract size) × (Market price)

Example:

• Buy 1 Lot EUR/USD (1 Lot = 100,000 units)
• Current price EUR/USD = 1.0900
• Swap Rate for Buy = -0.008%

Steps:

1. Total value = 1 × 100,000 × 1.0900 = 109,000 USD
2. Swap = 109,000 × (-0.008 / 100) = 109,000 × (-0.00008) = -8.72 USD per night
3. 3-Day Swap = -8.72 × 3 = -26.16 USD

Important Point: Swap vs Margin

Key point: Swap is calculated based on the “full value” of the position, not the margin you put up.

In the above example, with 1:100 leverage:

• Margin used = 109,000 / 100 = 1,090 USD
• Swap per night = -8.72 USD
• Percentage of Margin: (8.72 / 1,090) × 100 = 0.8% per night

This shows that swap costs are significant relative to margin, especially in sideways markets (Sideways), where swap can erode your portfolio even without price movement.

Opportunities and Risks: Both sides of the coin

( Risk Side

Unknowingly eating into profits: You might make a profit of 30 USD from price difference, but if you hold for 3 nights and incur a 3-Day Swap of -26 USD, your net profit drops to only 4 USD.

Pressure to close positions: In sideways markets, negative swap costs cause slow losses daily. Many traders can’t withstand this pressure and close their positions prematurely.

Leverage risk: High swap per margin increases the risk of margin calls if the market moves unfavorably.

) Opportunity Side

Carry Trade Strategy: Traders can “borrow” low-interest currencies ###e.g., JPY### to “buy” high-interest currencies (e.g., MXN or TRY) during certain periods, aiming to profit from positive swap.

Example: Buying AUD/JPY yields positive swap daily. The goal is to earn this swap every day, even if the price doesn’t move much.

Carry Trade Risks: The main risk is exchange rate fluctuations. If AUD/JPY drops sharply, losses from price movement may outweigh the accumulated swap over months. Suitable in stable markets.

Swap-Free Accounts: Many brokers offer “Islamic Accounts” that do not charge swap, in exchange for wider spreads or management fees. This option suits swing traders and position traders.

Summary: Swap is a Cost to Be Aware Of

Swap costs vary depending on trading style:

• Scalpers (trading minutes or hours): rarely hold overnight, so no swap impact
• Swing Traders (holding days to weeks): must consider swap, as it can eat into profits
• Position Traders (holding months or longer): swap becomes a strategic decision, often used in carry trades or swap-free accounts

Understanding and calculating swap costs is crucial for planning your trades. Ignoring it may lead to unexpected losses.