The following is a guest editorial courtesy of Carolane de Palmas, Markets Analyst at Retail FX and CFDs broker ActivTrades.

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For traders, attention is naturally focused on what happens after a position is opened. Entry levels, stop losses, leverage, spreads and market direction all play a role in determining a trader’s performance. Yet there is another part of a trading account that can have a meaningful impact on overall returns: the capital that is not being traded.

Holding cash is an essential part of risk management. Traders need liquidity to meet margin requirements, absorb market volatility and take advantage of new opportunities. But when that cash remains unremunerated for extended periods, it can create an often-overlooked drag on returns.

The issue becomes particularly relevant when interest rates are elevated. When central banks raise rates, cash and short-term savings instruments can offer increasingly attractive yields. This raises an important question for traders: what is the opportunity cost of leaving excess capital sitting idle in a trading account?

Cash Is Also A Trading Tool

Keeping capital outside the market is not necessarily a sign that a trader is inactive. In fact, experienced traders often deliberately maintain significant cash buffers.

A trader may want to avoid being fully invested because markets are volatile, valuations appear stretched or there are no compelling setups. Holding additional free margin can also reduce the risk of forced liquidation when open positions move against them. The problem is that liquidity and return have traditionally involved a trade-off. Cash provides flexibility, but cash that earns nothing has a zero nominal return.

This is where the concept of cash drag becomes relevant.

Cash drag refers to the performance difference created when part of a portfolio or trading account remains in cash rather than being invested in an asset generating a return. For long-term investors, this can become significant over time. For active traders, the effect depends on how much capital remains unused and for how long.

Consider a trader with €50,000 in an account who normally keeps €20,000 available as a liquidity buffer. If that €20,000 earns nothing, the trader is effectively accepting a 0% return on 40% of the account in exchange for liquidity. That may be perfectly rational. But it is still worth recognising as a financial trade-off.

The opportunity cost of idle cash becomes more visible when interest rates rise. When policy rates are close to zero, earning little or nothing on cash may not seem particularly important. There may simply be few attractive alternatives for low-risk capital.

The environment changes when central banks tighten monetary policy. Higher policy rates tend to filter through to deposit accounts, money-market instruments and other short-duration assets. As the return available on relatively low-risk cash alternatives increases, the cost of keeping unproductive cash also rises.

For traders, this creates an additional dimension to capital allocation.

Imagine two periods in which a trader keeps €20,000 uninvested. In the first, available cash yields are close to zero. In the second, comparable low-risk opportunities generate several percentage points annually. The amount of interest forgone by holding cash is dramatically different, even though the trading strategy itself has not changed.

This does not mean traders should automatically invest every dollar or euro that is not being used. Liquidity has a strategic value that should not be ignored. Instead, it means that the return generated by idle capital should be considered alongside the flexibility that cash provides.

Free Margin Is More Than Just “Unused Money”

The distinction between cash and free margin is also important for leveraged traders.

Free margin is generally the portion of account equity that is available after accounting for the margin currently committed to open positions. It provides the financial buffer needed to support existing trades and potentially open new ones.

A trader who uses leverage may therefore keep substantial free margin even while actively trading.

For example, someone with €50,000 in account equity may have only €15,000 tied up as margin, leaving €35,000 as free margin. That €35,000 is not necessarily money the trader wants to withdraw. It may be deliberately kept available to manage positions or respond to changing market conditions.

This makes the treatment of free margin an important consideration when comparing trading accounts. Rather than looking exclusively at spreads, commissions or execution speed, traders can also ask whether their broker offers any return on eligible uninvested balances and under what conditions.

The headline interest rate should not be the only consideration. Traders should examine whether the rate applies to the entire balance or only up to a certain threshold, whether different currencies receive different rates, how interest is calculated, when it is credited and whether there are eligibility requirements.

Currency is another important factor. A higher interest rate in US dollars, for example, may not necessarily be more attractive to a euro-based trader if converting funds creates foreign-exchange exposure or additional costs.

The same principle applies to any cash-interest arrangement: the effective return should be considered alongside liquidity, currency risk, trading costs and the terms of the account.

Brokers Like ActivTrades Are Beginning to Address the Idle-Cash Question

The growing focus on cash yields is also changing the way trading platforms can add value for clients.

As interest rates have become a more visible component of financial markets, traders have increasingly had to think about what happens to capital between positions. Some brokers and investment platforms have responded by introducing interest-bearing cash features, allowing clients to potentially earn a return without moving their funds away from the platform.

ActivTrades is one example.

The broker has introduced an offer providing annual interest of 3.3% on eligible US dollar balances and 2.4% on euro balances up to $/€100,000. Interest is calculated daily and credited monthly, with no separate enrollment process required.

The significance of the offer is less about the headline rate itself than what it illustrates: the cash component of a trading account is becoming part of the broader capital-allocation equation. For a trader who deliberately maintains free margin, the possibility of earning interest means that the decision to remain liquid does not necessarily have to mean accepting a zero return on that capital.

As always, traders should check the specific terms, eligibility criteria, applicable balance limits and conditions before relying on an advertised rate.

The information provided does not constitute investment research. The material has not been prepared in accordance with the legal requirements designed to promote the independence of investment research and as such is to be considered to be a marketing communication.

All information has been prepared by ActivTrades (“AT”). The information does not contain a record of AT’s prices, or an offer of or solicitation for a transaction in any financial instrument. No representation or warranty is given as to the accuracy or completeness of this information.

Any material provided does not have regard to the specific investment objective and financial situation of any person who may receive it. Past performance is not a reliable indicator of future performance. AT provides an execution-only service. Consequently, any person acting on the information provided does so at their own risk. Forecasts are not guarantees. Rates may change. Political risk is unpredictable. Central bank actions may vary. Platforms’ tools do not guarantee success.