Just noticed that many traders still don't fully understand what Swap really is. It's not just a natural fee, but an implicit cost that can eat into your profits unknowingly.

Simply put, Swap is the interest accrued from holding a position overnight. It comes from the interest rate differential between the two currencies. When you Buy EUR/USD, you're buying EUR (interest rate 4%) and borrowing USD (interest rate 5%). The difference is -1% per year. That is the Swap you have to pay.

The problem is that brokers add their own handling fee, so even though theoretically you should receive a positive Swap, in reality, the Swap you receive may be reduced or turn negative on both sides. This is why Long Swap and Short Swap are not equal at all.

What’s scary is the 3-Day Swap that occurs on Wednesday night (mostly). Brokers combine the Swap for Saturday-Sunday, so that night you are charged 3 times the Swap. If you hold a 1 Lot EUR/USD order with a Long Swap of -8.5 USD per night, on Wednesday you will be charged -25.5 USD.

Calculating Swap isn't as difficult as it seems. If the broker shows it as a percentage, just multiply (position value) × (Swap rate %), and you'll get the answer. For example, 1 Lot EUR/USD at 1.0900 with a Swap of -0.008% per night = 109,000 × -0.00008 = -8.72 USD.

What you need to be aware of is that Swap is calculated based on the full value, not the margin used. If you leverage 1:100 and put up a margin of 1,090 USD but lose 8.72 USD per night, that’s 0.8% of your margin per day. In a stagnant market, Swap can eat up your funds completely.

But Swap isn't just about risk; it also offers opportunities. Carry Trade involves buying high-interest currencies and borrowing low-interest currencies to earn positive Swap daily. For example, buying AUD/JPY. If the Long Swap is positive, you will earn money into your account every night. However, the risk is that the AUD/JPY price might plummet, causing losses from exchange rate fluctuations.

Another option is Swap-Free accounts (Islamic Accounts), which do not charge Swap at all. These are suitable for Swing Traders or Position Traders who hold positions for a long time. Of course, brokers need to earn income elsewhere, such as by increasing the spread or charging fixed fees.

In summary, Swap is not a minor matter. If you're a short-term trader (scalper), it has little impact. But if you hold positions for a week or a month, Swap becomes a crucial factor in your decision-making. Sometimes, you need to trade only the side with positive Swap or use Swap-Free accounts. Choosing a platform that clearly displays Swap information without hidden costs will help you plan your trades better.