Forex Swap Explained 2026 — Overnight Interest Guide

What is a forex swap (rollover)?

A forex swap — often called a rollover — is the overnight interest you either pay or receive for holding a currency position past your broker's daily cutoff time. It arises because forex trading involves simultaneously buying one currency and selling another. Each currency has an interest rate set by its central bank (or short-term market rate). The difference between those rates determines whether you pay or earn overnight interest.

Key terms, defined simply

Pip: the standard smallest price move for most currency pairs (for EUR/USD a pip is 0.0001).
Lot: the contract size. Standard = 100,000 units, Mini = 10,000, Micro = 1,000.
Spread: the difference between bid and ask prices (a trading cost).
Margin: funds a broker requires to open a leveraged position. Formula: margin = (lot size × price) ÷ leverage.
Leverage: the ratio allowing you to control a larger position with smaller capital.

Why swaps exist (intuitive view)

When you buy a currency pair (for example, long EUR/USD) you are buying euros and selling US dollars. You are, in effect, borrowing the currency you sell (USD) and lending the currency you buy (EUR). Because borrowing and lending carry interest, your broker adjusts your account for the net interest difference daily. That adjustment is the swap.

How overnight interest is calculated — the correct formula

At a simple level the net interest you would earn or pay is the interest rate of the currency you are long minus the interest rate of the currency you are short, applied to the notional position size for one day.

Simple formula (quote-currency example):

Daily swap (in quote currency) ≈ Notional × (rate_base - rate_quote) ÷ 365

Notes:

"Notional" = lot size × contract units × current price (e.g., 1 standard lot EUR/USD at price 1.1000 is 100,000 × 1.1000 = $110,000).
Brokers may use 360 days or 365 days and then convert into pips or quote currency. Always check your broker's swap-rate definition.
Brokers frequently present swap in pips per lot per night or as a monetary value per lot. Follow their published figures for precise bookkeeping.

Worked example — long EUR/USD, realistic numbers

Assume:

Position: long 1 standard lot EUR/USD = 100,000 EUR.
Price: EUR/USD = 1.1000 (so notional in USD = 100,000 × 1.1 = $110,000).
Interest rates: EUR rate = 3.50% p.a., USD rate = 1.50% p.a.

Net annual interest = EUR rate − USD rate = 3.50% − 1.50% = 2.00%.

Annual interest in EUR on 100,000 EUR = 100,000 × 2.00% = 2,000 EUR.

Convert to USD at the current price (1.1000): 2,000 × 1.1 = $2,200 per year.

Daily swap ≈ $2,200 ÷ 365 ≈ $6.03 per night received while the position stays open. (Your broker may show this as +0.55 pips or as +$6.03 per lot — check the broker table.)

Worked example — short position (you pay swap)

Short 1 standard lot EUR/USD with the same rates: you would pay the net 2.00% per year. That equals ≈ $6.03 per night paid.

How brokers actually apply swaps (practical details)

Rollover time: most brokers apply swaps at their daily cutoff (commonly 17:00 New York server time). This often equals 22:00 GMT but can change with daylight saving. Always check your broker's server time.
Triple rollover day: to account for Saturday and Sunday (when interbank markets are closed), brokers typically charge or pay three nights' swaps on one weekday — commonly Wednesday. Check which day your broker uses.
Holidays: around bank holidays, swap rates can be different or multiplied for multiple days. Brokers usually publish holiday swap schedules.
Presentation: swap can be shown as a pip amount, as a monetary figure per lot, or as an annualised rate. Use the broker's published value for exact ledger numbers.

Common misunderstandings

Swap is based on notional size, not on margin. Changing leverage changes required margin but does not change the swap for the same notional position.
Spread and commission are separate costs from swap. See our guide on spreads for more detail: Forex Bid Ask Spread Explained.
Swap signs depend on direction: buy one side, sell the other. Buying the higher-rate currency versus selling a lower-rate one usually yields positive swap; the reverse yields negative swap.

Simple rules beginners can use to minimise swap costs

Trade intraday if you plan to avoid swaps entirely — close positions before the broker's rollover time.
Use a swap calculator and the broker's published swap table to estimate weekly or monthly costs: some brokers list swap per lot per night for common pairs.
If you must hold overnight, prefer pairs with small or positive swap if it fits your trade idea. Positive swap is not a reason to take a trade on its own.
Consider swap-free (Islamic) accounts only if your broker offers them. Remember swap-free accounts may have other costs (wider spreads, fixed fees). See our article on account types: Types of Forex Accounts Explained (Standard, Mini, ECN).
Mind the triple-swap weekday and holiday schedules to avoid unexpected charges.
Always calculate swap impact as part of trade management. For recurring trades, add expected swap to your trade expectancy calculation — learn how in our lesson on trade expectancy: Forex Trade Expectancy: How to Calculate & Improve (2026).

Can you profit from carry trades?

The carry trade is a strategy that tries to earn the interest differential: you borrow a low-rate currency to buy a high-rate currency and collect the positive swap. It has worked for professional traders over many cycles but carries clear risks.

Simple rules for considering carry trades (beginners)

Never rely on swap alone. Currency moves can eliminate interest gains within days. Treat swap as a small edge, not the main thesis.
Use realistic position sizes: risk no more than 0.5–2% of account equity per trade. For a $1,000 demo account, risk $5–$20 per trade.
Prefer markets with low volatility when using carry trades — volatility creates large moves that kill the interest advantage.
Have a proper exit plan and stop loss. Carry trades can turn into large losses quickly if central banks change policy or liquidity dries up.
Monitor macro events and use an economic calendar to track rate decisions. See our guide on using an economic calendar: How to Use a Forex Economic Calendar — 2026 Beginner.

A simple checklist before holding overnight

Check the broker's published swap for your pair and position size.
Confirm the broker's rollover time and triple-swap weekday.
Estimate the dollar cost or income per night and per week for your lot size.
Factor swap into your risk-reward and trade management plan (see: Forex Trade Management 2026).
Practice the plan on a demo account before risking real money. Open a free demo with our partner broker Exness and try the examples here: open a free Exness demo account

Practical examples: quick table

Pair	Long vs Short	Typical result
EUR/USD	Long EUR / Short USD	Receive swap if EUR rate > USD rate
AUD/JPY	Long AUD / Short JPY	Often positive carry historically (check current rates)
USD/JPY	Long USD / Short JPY	May receive swap if USD rate > JPY rate

Always check current rates. These are examples of structure, not recommendations.

Where this fits into structured learning

Understanding swaps is essential for trade management and carrying multi-day positions. If you're new, follow a structured path: start with foundation lessons, then practice trade management and expectancy so you can judge whether overnight holding suits your plan. Our courses are organised by difficulty so you progress logically from basics to advanced trade management. Browse the course catalog and start today: https://forexfluency.com/courses

Next steps (practice and review)

1) Use a demo account to open a small overnight position and observe how your broker posts swaps in the account ledger (use Exness demo if you want: open a free Exness demo account). 2) Keep a weekly trade audit and note swap impact — our Forex Weekly Review Template 2026 can help. 3) Add swap to your trade expectancy calculations as shown in our expectancy guide (linked above).

Final quick checklist

Check swap rates and rollover time with your broker before holding overnight.
Remember swap is paid on notional size, not margin.
Use demo accounts to test. Keep position sizes small until your edge is proven.
Use structured learning to build skill and risk management: https://forexfluency.com/courses

Short motivating CTA

If you want step-by-step lessons on swaps, trade management and building a rules-based plan, our courses at Forex Fluency teach these topics in sequence with worked examples and quizzes. Enrol and start learning today: https://forexfluency.com/courses

Risk warning: Trading forex on margin carries a high level of risk and may not be suitable for all investors. Never trade with funds you cannot afford to lose.

Frequently Asked Questions

What exactly is a forex swap?

A forex swap (also called a rollover) is the overnight interest you either pay or receive for holding a currency position past your broker's daily cutoff. It reflects the interest-rate difference between the two currencies in the pair.

When does my broker charge or pay swaps?

Most brokers apply swaps at their daily rollover time (commonly 17:00 New York server time). Brokers usually charge or pay three nights' swaps on a designated weekday (commonly Wednesday) to cover the weekend. Check your broker's published schedule.

How is swap calculated?

A simple formula: Daily swap ≈ Notional × (rate_base − rate_quote) ÷ 365. Brokers convert this to pips or monetary value and may use 360 days or add markups. Always use your broker's published swap table for exact figures.

Does leverage affect the swap I pay or receive?

No. Swap is computed on the notional position size (the amount of currency controlled), not on margin. Changing leverage changes required margin but not swap for the same notional.

Can I profit reliably from carry trades (positive swaps)?

Carry trades aim to earn the interest differential, but currency moves and central-bank changes can wipe gains quickly. Treat swap as a supplementary edge, use strict risk management, and test strategies on demo before risking real capital.

How can I avoid swaps?

Close positions before the broker's rollover time (trade intraday), or use a broker's swap-free account if eligible. Note swap-free accounts may come with other costs, such as wider spreads.

Where do I find my broker's exact swap rates and triple-swap day?

Your broker's website or trading platform will list swap rates per pair, per lot and the rollover schedule. Use those published figures for accounting and planning.

Should I include swap in my trade plan?

Yes. For trades held multiple nights, estimate swap in dollars per night and include it in your trade expectancy and risk-reward calculations. Our trade expectancy guide explains how: https://forexfluency.com/blog/forex-trade-expectancy-how-to-calculate-improve-2026