What is swap and why does it matter?

What swap is

When you hold a forex position past 5pm New York time (that's 6am Manila the next day), your broker applies a swap — also called rollover. It's a small credit or debit that shows up in your account balance, separate from the profit or loss of the trade itself.

Swap exists because every forex trade is technically two things at once: you borrow one currency to buy another. If you hold that position overnight, the market charges or pays you the interest-rate differential between the two.

How it works in practice

Let's say you go long on USD/PHP (you're buying dollars, selling pesos).

• If the US Federal Reserve's interest rate is higher than the BSP's rate, you earn a small positive swap every night you hold the trade.
• If the peso rate is higher, you pay.

The size of the swap depends on:

• The interest-rate gap between the two currencies
• Your position size
• Your broker's markup (yes, they take a cut)

Why Wednesday is different

Forex markets are closed Saturday and Sunday, but interest accrues every calendar day. To account for that, brokers apply triple swap on Wednesday — one day's worth for Wednesday itself, plus Saturday and Sunday.

If you're holding a position with negative swap, that Wednesday hit is three times larger.

Who should care

Scalpers and day traders: Swap is invisible to you. You're in and out in minutes or hours. Ignore it.

Swing traders: If you hold positions for days or weeks, swap becomes part of your trade math. A position that earns ₱50 per day in swap over two weeks adds ₱700 to your result — or subtracts it, if the swap is negative.

Carry traders: Some traders build entire strategies around positive swap, going long high-yielding currencies against low-yielding ones and holding for months. It works — until the exchange rate moves against you faster than the swap can compensate.

A real example

Imagine you're long USD/PHP at 56.50, holding 1 standard lot (100,000 units). The interest-rate differential gives you a positive swap of roughly ₱80 per night (this is illustrative; real swap varies by broker and current rates).

Hold for 10 days = ₱800 in swap income. But if the pair drops 50 pips against you, you've lost ₱2,800 in price movement. Swap didn't save you.

The lesson: swap is real, but it's never the main event. Price movement is.

Where to find your broker's swap rates

Most brokers publish a swap table showing the credit or debit per lot per night for every pair. It's usually buried in the trading platform specs or the broker's website. Check it before you hold anything overnight.

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