Here's a question that separates the traders who actually understand their P&L from those who just stare at the price. You open a leveraged position, the trade goes exactly as expected, yet somehow you're slightly worse off than the maths suggests. Overnight funding is often the silent culprit — and it catches people off guard because it operates in the background like a subscription you forgot to cancel.

The direct answer is this: when you hold a leveraged position overnight, your broker is effectively lending you money to control a position larger than your capital. Like any loan, that borrowed capital attracts interest. The charge — often called a swap rate, rollover fee, or overnight financing cost — gets debited or credited to your account each night the position stays open. It's not a scam. It's just the cost of using borrowed money.

CONCEPTOvernight funding is the interest cost of holding a leveraged position beyond the daily market close.
WARNINGHolding high-leverage positions for weeks can see funding costs exceed the profit from the trade itself.
KEY IDEASwap rates are driven by interbank interest rate differentials — they can work for or against you depending on direction.

Think of it like renting a car versus buying one. You get access to a vehicle far more expensive than what you could outright afford, but you pay a daily rental fee for the privilege. The fee doesn't care whether you're having a good trip or a terrible one — it runs regardless. Overnight funding works exactly the same way: the charge accrues whether your position is profitable or deep in the red.

Cumulative Funding Cost vs Trade Profit (30 Days) $500 $375 $250 $125 Day 5 Day 10 Day 20 Day 30 Trade Profit Funding Cost

The rate itself is derived from interbank interest rates — specifically the differential between the two currencies or the benchmark rate tied to the asset you're trading. On forex pairs, if you're long a currency with a higher interest rate than the one you're short, you might actually receive a small credit. Go the other direction and you pay. For CFDs on equities or indices, the charge is typically based on a benchmark rate like SOFR or a broker-specified rate, plus a margin. Wednesday nights often carry a triple charge to account for the weekend — a detail that bites more traders than it should. Understanding the mechanics behind swap rates, the concept of rollover in finance, and how leverage amplifies both gains and costs gives traders a far clearer picture of their true position economics before they commit to a multi-day hold.

The practical takeaway is simple: before holding any leveraged position overnight, check your broker's swap schedule and factor that cost into your trade plan. If the funding erodes your expected profit margin, the trade's risk-reward profile looks very different on day fifteen than it did on day one.

Overnight funding isn't the enemy — ignorance of it is.

This content is for educational purposes only and does not constitute financial product advice. Past performance is not indicative of future results. Profit Logic Ltd (ACN 688 669 936) accepts no responsibility for errors or omissions in this content or anywhere on this website. Always seek advice from a licensed financial adviser before making investment decisions.