The forex spread, the swap and slippage are the three costs you pay on almost every trade, even though none of them appears as a "commission" in your history. On their own they look small: a few cents here, a couple of dollars there. Added up over hundreds of trades, they can make the difference between a profitable strategy and one that loses money.
In this guide we explain what each one is, how to calculate what it costs you in dollars and what you can do to pay less.
What is the spread in forex
The spread is the difference between the buy price (ask) and the sell price (bid). When you buy, you enter at the ask; when you close, you exit at the bid. That is why every trade starts at a loss: the spread.
A real example with Friday, September 25, 2026 closing prices:
| Instrument | Bid | Ask | Spread |
|---|---|---|---|
| EUR/USD | 1.13920 | 1.13922 | 0.2 pips |
| AUD/USD | 0.70255 | 0.70260 | 0.5 pips |
| Gold (XAU/USD) | 4,284.95 | 4,285.12 | 17 cents |
| USD/MXN | 17.67248 | 17.68202 | 95 pips |
Note the difference: the world's most traded pair has a minimal spread, while the dollar against the Mexican peso, an exotic pair, can have a spread hundreds of times wider.
How to calculate the cost of the spread in dollars
The formula is simple: spread × pip (or point) value × lots.
- EUR/USD: with 1 standard lot (100,000 euros), each pip is worth $10. A 0.2-pip spread costs $2 per lot. With 0.10 lots, $0.20.
- Gold: 1 lot is 100 ounces, so each cent is worth $1. A 17-cent spread costs $17 per lot.
- USD/MXN: the pip (0.0001 MXN) is worth about $0.57 per lot at this price (100,000 × 0.0001 ÷ 17.68). A 95-pip spread costs about $54 per lot.
For a scalper making 10 gold trades a day with 1 lot, $17 per trade is $170 a day in spread alone. That is why scalping gold requires trading during the most liquid hours.
Fixed and variable spreads
- Variable (floating): changes with liquidity. It is very low during the busiest hours and widens when liquidity is thin or tension is high.
- Fixed: does not change, but is usually higher on average, and in extreme conditions may come with requotes.
When the spread widens
- At the open and close of the trading day (around 17:00 New York time, when New York closes and positions are rolled). It is the worst time to enter.
- On high-impact releases: during NFP or a Fed decision, the gold spread can multiply several times for a few seconds. We cover it in the NFP guide.
- On holidays and during the Asian session for European and American pairs.
- At the Sunday reopen, with thin liquidity and possible price gaps.
Check the forex market hours to see when each pair has the most liquidity.
What is the swap (or rollover)
The swap is the interest you pay or earn for holding a position overnight. It exists because in forex you buy one currency and sell another: you receive the interest of the one you buy and pay the interest of the one you sell. On top of that comes the markup applied by whoever provides the service.
- Positive swap: you buy the currency with the higher interest rate. You may earn a small amount each night (if the markup does not cancel it out).
- Negative swap: you buy the currency with the lower rate. You pay each night.
In practice, on many pairs both sides have a negative swap, because the markup eats up the rate differential.
How to calculate the swap
The approximate formula is:
Daily swap ≈ position size × (rate differential ± markup) ÷ 365
An illustrative example: a 1-lot position ($100,000) with a net differential of 3% a year in your favor earns about 100,000 × 0.03 ÷ 365 ≈ $8.2 per night. With a net differential of −3%, you would pay the same. Over 30 days that is about $246: a figure that can exceed the profit of a medium-term trade.
The key point: the swap is listed in the contract specifications of each instrument on your platform (in MetaTrader 5, right-click the symbol → Specification). Check it before leaving a trade open for several days.
Wednesday's triple swap
On most currency pairs, the swap for Wednesday night into Thursday is charged three times. It makes up for the weekend: currency trades settle two business days later, so a position held on Wednesday settles the following Monday. On some instruments, such as indices or commodities, the triple swap may apply on Friday. Again, check the symbol specification.
Why the swap matters more now
With the Federal Reserve at 3.75%–4.00% after its September 16 hike and the RBA about to decide whether to raise rates to 4.60%, rate differentials between currencies are high. That makes the swap weigh more on multi-day trades, for or against you depending on the side.
What is slippage
Slippage is the difference between the price at which you ask for your order to be filled and the price at which it is actually filled. It happens because the price moves between the moment you send the order and the moment it is executed.
- Negative slippage: you buy higher or sell lower than expected.
- Positive slippage: you get a better price. It exists too, although it is remembered less.
When slippage appears
- Market orders during volatile moments (data, news, opens).
- Stop losses: when triggered, they become market orders. In a sharp move, they can close several pips worse than the level you set.
- Weekend gaps: if the market opens on Sunday above or below your stop, it is filled at the first available price, not at your stop.
- Large positions in illiquid instruments.
Example: you place a gold stop at 4,234 and a surprise release drops the price $15 in one second. Your stop may be filled at 4,228. With 0.50 lots, that $6 difference is an extra $300 loss.
How to reduce these three costs
To pay less spread
- Trade the most liquid pairs and hours: EUR/USD, GBP/USD, USD/JPY and gold during the London–New York overlap (08:00 to 11:30 New York time, 13:00 to 16:30 London).
- Avoid entering at the New York daily close and in the seconds around a release.
- Compare the total cost (spread + commission) between accounts: a commission-free account with a 1.2-pip spread can be more expensive than one with a commission and a 0.1-pip spread.
To keep the swap under control
- If you swing trade, include the swap in your risk/reward calculation.
- Check whether your trade will be open over Wednesday night.
- Some accounts offer swap-free options with other conditions: read them carefully, because they often include fixed daily fees.
To limit slippage
- Use limit orders to enter whenever you can: they fill at your price or better, never worse (although they may not fill).
- Reduce your size before high-impact releases.
- Close or protect positions before the weekend if you do not want to be exposed to a gap.
- Give your stop some room: a stop right next to the price in a volatile moment is more likely to suffer slippage.
Include costs in your risk management
If you risk 1% per trade, costs must be part of that calculation. A 10-pip stop on EUR/USD with 1 pip of total costs means 10% of your risk is gone before you start. We explain it step by step in the 1% rule and position sizing.
And if you want to know how much spread, swap and commissions have really cost you, you can ask AIM, AIMPATFX's AI advisor, to review your trades and help you see what share of your results goes to costs.
Frequently asked questions
What is a low spread in forex?
On major pairs such as EUR/USD, a spread below 1 pip is considered low during liquid hours. On gold, from a few cents up to around twenty. On exotic pairs such as USD/MXN, it is normally much wider.
Is the swap charged if I open and close the trade on the same day?
No. The swap only applies to positions still open at the daily close (around 17:00 New York time).
Why is the swap tripled on Wednesday?
Because currency trades settle two business days later: a Wednesday position settles on Monday, so Saturday and Sunday nights are charged. On some instruments the triple swap applies on another day; check the symbol specification.
Can slippage be avoided?
Not completely. But you can reduce it with limit orders, by avoiding the seconds around news and the Sunday open, and by adjusting your position size.
