Is forex suitable for long-term investing?

I get this question regularly from readers who look at a rising dollar and think sensibly: if the currency is appreciating anyway, why keep my savings in the bank instead of buying it on forex and sitting on the position for a few years? The logic sounds reasonable, but it rests on a mistaken idea of what forex actually is. It is not a savings account in a foreign currency. It is a market of leveraged contracts, built for trading the price move, not for holding a position for years. Below I explain why, and what genuinely suits a long horizon.

Why is forex inherently short-term?

Retail currency trading almost always runs through CFDs — contracts that settle the price difference. These products are leveraged by design: the UK regulator, the FCA, confirms leverage limits from 30:1 down to 2:1, automatic close-out at 50 percent of required margin and protection against a negative balance. Leverage here is the default operating mode, not an extra option you switch on.

And here is the heart of the problem. Leverage works beautifully over a short distance, when you catch a move of a few dozen pips and close the position. Over a span of several years it turns into a trap. A major pair can pull back a few percent as an ordinary correction — and at one-to-thirty leverage that move eats most of your margin and reaches the stop-out level before the trend you were counting on even begins. Holding a leveraged position for years is not investing; it is constant balancing on the edge of a margin call. What this contract actually is, I take apart piece by piece in the article on what a CFD is.

How much does holding a position for a year cost?

The most underestimated cost is the swap point. For every position carried overnight the broker charges a swap, driven by the interest rate differential between the two currencies in the pair and topped up with its own margin. On Wednesday it usually charges triple, settling the weekend in advance. If the swap is negative for you — and it usually is when you buy the lower-yielding currency — the cost accumulates every single day, regardless of whether the rate moves your way or not.

Let me put real numbers on it, as an illustrative example. Suppose a negative swap of 2 USD per lot per day. That sounds harmless. But the market trades roughly 250 days a year, so 2 USD times 250 days is about 500 USD of drain per year on every full lot — before we even count the spread on opening and closing. On a position held for three years that is around 1,500 USD handed to the broker simply for owning the contract. The mechanics of how the swap is charged, and when it works in your favour, I cover separately in the article on what a forex swap is.

"An investment operation is one which, upon thorough analysis, promises safety of principal and an adequate return. Operations not meeting these requirements are speculative." — Benjamin Graham, The Intelligent Investor, Harper & Brothers, 1949.

A currency deposit versus a leveraged CFD

Take the same 10,000 EUR and look at two scenarios over a year. This is an illustrative example, but the numbers are realistic. In the first, you keep the money in a non-leveraged currency account at a bank. You own real euro, you earn interest tied to the rate — the reference point here is the ECB deposit facility rate — and if the euro strengthens against your home currency, you gain on the valuation. There is no daily swap, no leverage and no risk that someone closes your position for you.

In the second scenario you buy the equivalent of 10,000 EUR as a leveraged CFD with a negative swap. Here, even if the rate behaves identically, the daily swap points eat into your capital, and a few-percent swing the wrong way can trigger a stop-out and close the position at a loss before the move you expected ever arrives. The same rate move, two completely different outcomes. The difference does not come from a forecast — it comes from the construction of the instrument. Put plainly: for holding a currency over years, a deposit is simply the right tool and a CFD is not.

What about the carry trade, since the swap can be positive?

You are probably thinking now: what if I pick the pair so that the swap is positive? That is exactly the idea of the carry trade — you buy the currency with the higher interest rate, and the broker credits you a small amount every day. On paper it looks like an annuity. In practice it is one of the most treacherous strategies in the market, because a positive swap lulls you into complacency.

The trouble is that the positive swap point is usually small compared with the exchange-rate risk. A single sharp reversal in the pair can wipe out months of quiet rollover in a few days. The classic example is the Japanese yen — for years a favourite funding currency for the carry, and one that, on a sudden strengthening, has repeatedly ruined speculators counting on a calm income. I break the mechanics and the pitfalls down in the analysis of the USD/JPY carry trade, and there is a concise definition in the carry trade glossary entry on ForexMechanics. No sugarcoating it: the carry trade is a speculative strategy with a real risk of losing capital, not safe saving with an interest top-up.

What to do tomorrow

If your goal is long-term exposure to a currency rather than trading its move, separate the two before you deposit a single unit. This is not investment advice — check the details with your bank and adviser. Here are three concrete steps for this week.

1. Name your goal honestly before you choose an instrument. Sit down for a quarter of an hour and write in one sentence what you actually want: to hold euro or dollars for several years, or to actively trade their move. If it is the former, forex and CFDs are out by definition — you are looking for a deposit or a fund, not a leveraged account.
2. Compare the real cost of holding the currency for a year in both options. Go to your bank's website for the interest on a currency account, and check the broker's swap point table for the pair you have in mind. Multiply the daily swap by 250 days and set it against the deposit interest. You will see in black and white which option works for you and which works for the broker.
3. Reserve forex strictly for speculative capital you can afford to lose. If you still want to trade the currency market, treat it as a separate drawer of risk money rather than a place for retirement savings. Why these two worlds must be kept apart, I explain in the article on forex in a retirement portfolio, which also covers how a small currency-trading sleeve can sit beside long-term holdings without contaminating them.