I get this question regularly from readers who observe a strengthening reserve currency and think logically: if the US dollar or euro is appreciating in a cyclical trend, why keep cash in an ordinary domestic account instead of buying on forex and holding the position for several years? While the premise seems intuitive, it rests on a fundamental misconception of retail foreign exchange. Retail forex is not a foreign currency savings deposit. It is a market of margined derivatives engineered for short-term price fluctuation, not multi-year asset accumulation. Below, I explain the mathematical and structural reasons why, and examine the instruments that genuinely fit a multi-year horizon.

Why is forex inherently short-term?

A currency CFD settles the cash difference between entry and exit prices without delivering the underlying currency. The UK FCA retail rules require initial margin of at least 3.33% for major currency pairs and 5% for non-major pairs, commonly expressed as leverage limits of 30:1 and 20:1. Net equity below 50% of the margin requirement for open positions requires close-out as soon as market conditions allow; negative balance protection limits liability to account funds. In the EU, national product-intervention measures replaced ESMA’s temporary measures. The relevant rules’ product and client scope must be checked; the close-out threshold does not guarantee an execution price.

Here lies the core dilemma. Leverage functions effectively over short time horizons when a trader targets an intraday price swing of 30 to 80 pips and exits the market. Over a multi-year horizon, leverage turns ordinary market noise into a structural trap. An exchange rate on a major currency pair routinely fluctuates through five to ten percent retracements during a multi-year secular trend. For a single position funded only with its initial margin, 30:1 exposure would exhaust that margin after an adverse price move of about 3.33 percent, ignoring costs. UK FCA retail rules require positions to be closed as soon as market conditions allow if account net equity falls below 50 percent of the margin requirement for open positions. In the EU, national measures replaced ESMA’s temporary intervention; for example, Germany’s retail CFD measure uses half the total required initial margin across open CFDs. These rules apply only within their stated scope. Extra cash, other positions, costs and execution affect the outcome; a threshold does not guarantee the closing price. Maintaining a leveraged position over years is not long-term investing; it is chronic exposure to margin liquidation. For a comprehensive deconstruction of these contracts, read our guide on what a CFD is.

Worked example

A position may close before your planned horizon

Scroll sideways to see the full diagram

An illustrative close-out threshold ends long-term exposureAn account starts at 1,000 USD with 10,000 USD notional exposure. The price first falls by 8 percent, which would leave 200 USD without closing the position. The chosen 250 USD close-out threshold is reached earlier, after a 750 USD loss. A final price 2 percent above entry would leave 1,200 USD only if the position remained open, which this model does not allow.The endpoint is not the whole storyAccount equity in USD · no fees in this model1,2001,000500250Threshold 250StartFallEndClose at threshold: 250 USD leftA later rise does not reopen the position.

Assume 10,000 USD notional exposure and starting equity of 1,000 USD. The price first falls 8%, then finishes 2% above entry. This separate model closes the position exactly when account equity reaches 250 USD. That happens after a 750 USD loss, at a −7.5% price move, before the path reaches its low. The dashed line shows what would happen without closing; it is not the account’s actual equity after close-out.

Hypothetical model. The 250 USD threshold is chosen solely for illustration; it is neither a broker rule nor a regulatory requirement. Notional exposure and equity are in USD, with a linear price relationship, no fees, currency conversion or slippage, and exact execution at the threshold. Check the account agreement for actual close-out rules and execution terms.

How much does holding a position for a year cost?

Overnight financing, often called swap or rollover, can be a material cost of holding a currency CFD. The amount, calculation method and accrual schedule depend on the provider and contract. Check the long and short financing terms, the rollover time and any weekend or holiday adjustments; neither a universal New York cutoff nor a Wednesday multiplier should be assumed for every contract. MetaTrader’s official symbol properties distinguish the swap calculation mode, long/short values and the configured three-day rollover day.

Negative financing charges can reduce equity even if the market price is unchanged. The following hypothetical example sums flat charge amounts rather than compounding an interest rate. Assume $100,000 initial notional exposure and exactly 250 financing charge events per year, each costing $2.50 after all applicable adjustments. These are fictional inputs, not a broker’s daily rate or trading calendar.

Hypothetical financing model: $100,000 initial notional exposure
Assumed exposure$100,000 initial notional; not a universal lot specification
Assumed financing charge-$2.50 per charge event, including all assumed provider and weekend/holiday adjustments
Charge events per model year250; a fictional schedule, not 250 trading days plus extra rollover multipliers
First model-year cost-$2.50 × 250 = -$625.00 USD
Three model-year cost-$625.00 × 3 = -$1,875.00 USD, assuming the same charges each year
ScopeNo additional weekend multiplier is applied. This sum excludes price changes, spread, separate commissions and tax.

Under those assumptions, $1,875 of financing charges equal 18.75% of an initial $10,000 account balance. This is the sum of modelled charges, not an annual market yield or an estimate for every provider. We detail contract financing terms in our analysis of 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.

How does a spot currency deposit compare to a leveraged CFD?

For a separate hypothetical one-year comparison, assume each vehicle starts with $10,000 of account equity. Vehicle A holds an unleveraged EUR deposit initially worth $10,000, with fictional 3.50% simple annual interest paid in EUR at year-end. The rally scenario assumes EUR/USD rises 6% and converts both principal and interest at that ending rate. Vehicle B has $100,000 initial USD notional exposure, a fixed 30:1 initial-margin assumption and the fictional 250-charge financing schedule above. Price results are linear in the initial exposure; the rally calculation assumes no earlier close-out. These are model inputs, with no spreads, separate fees or tax.

One-year performance comparison: physical cash deposit vs leveraged CFD
Allocated capital$10,000 USD equivalent
Vehicle A: Bank foreign currency depositHypothetical EUR cash deposit with 3.50% simple annual interest under assumed account terms; not a current ECB rate or bank offer
Vehicle B: Leveraged EUR/USD CFD$100,000 initial USD notional exposure; fixed 30:1 initial-margin assumption; 250 financing charges of $2.50 in the model year
Scenario 1: Currency rallies 6.0%Vehicle A: +$600 FX gain + $371 interest at the ending exchange rate = +$971. Vehicle B: +$6,000 price gain − $625 model financing = +$5,375, assuming no earlier close-out.
Scenario 2: Mid-year 4.0% pullbackVehicle A valuation falls to $9,600 before interest. Under the table's assumed $100,000 exposure, Vehicle B loses $4,000 before fees, leaving $6,000 account equity. At a fixed 30:1 initial-margin assumption, the required margin is about $3,333 and half of that is about $1,667; this simplified 4% move alone does not reach that close-out threshold.
Structural conclusionAn unleveraged currency holding remains exposed to exchange-rate losses without margin close-out. A leveraged CFD can be closed before a later recovery, but the realised loss depends on account equity, required margin, costs and execution.

An unleveraged EUR bank balance remains exposed to exchange-rate losses when valued in USD; a later recovery is not guaranteed. It does not face CFD margin close-out. The depositor’s interest depends on the bank account agreement. The ECB deposit facility rate applies to banks’ overnight deposits with the central bank, rather than guaranteeing a household’s deposit rate. A money market fund has its own portfolio return, fees and risks and should not be treated as the same product as a bank deposit.

Beyond bank deposits, long-term allocators have access to liquid, regulated exchange-traded products. Short-term sovereign bond ETFs, currency-hedged index funds, and Treasury bill UCITS ETFs allow investors to capture foreign currency appreciation and yield without incurring margin call risk. As demonstrated by the Bank for International Settlements Triennial Survey, foreign exchange derivatives are built for continuous institutional balance-sheet adjustment and short-term turnover, not buy-and-hold saving.

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

A natural follow-up question is whether an investor can circumvent financing drag by buying a currency with a higher central bank policy rate, turning the daily swap charge into a credit. This strategy is known as the currency carry trade. In theory, receiving daily positive rollover cash while holding an exchange-rate position sounds equivalent to earning bond coupons.

Positive financing credits depend on the provider and contract and can change; they are not a guaranteed daily yield. Adverse currency movements can outweigh accumulated credits, while leverage and account margin rules affect how long a position remains open. Check the actual financing schedule and the possibility of a negative charge rather than assuming a typical number of basis points per day. We examine these risks in our analysis of the USD/JPY carry trade and explain the terminology in the carry trade glossary entry on ForexMechanics. Financing credits alone do not turn a leveraged currency position into a savings deposit.

What to do tomorrow: three practical rules for long-term allocators

If your objective is multi-year foreign currency diversification rather than active technical trading, separate your wealth-preservation capital from speculative trading before funding an account. Consider these three practical steps:

  1. Formulate your exact investment horizon in writing before selecting an account type. Determine whether your primary goal is multi-year currency purchasing-power preservation or short-term speculative trading. If you intend to hold capital across years, rule out leveraged CFD accounts entirely and focus on regulated cash deposits, Treasury bills, or unleveraged bond ETFs.
  2. Conduct an annualized net-yield audit between cash products and broker rollovers. Review the current interest rate offered on foreign currency deposits at your primary banking institution. Compare that yield against the published overnight swap rates for the relevant pair on your trading terminal. Quantifying the net annual difference will reveal whether overnight financing is working for you or against you.
  3. Ring-fence active foreign exchange trading to discretionary risk capital. If you choose to trade currency fluctuations actively, allocate only speculative funds whose full loss would not jeopardize your long-term solvency. Maintain your core long-term portfolio in diversified, unleveraged asset classes. For a detailed guide on structuring long-term portfolios, explore our article on forex in a retirement portfolio.