Cash as an asset class

Cash is frequently treated as the absence of investment rather than as an asset with specific properties, which leads to both excessive and inadequate holdings.

What cash provides

Its actual properties.

Certainty of nominal value, which no other asset offers.

Immediate liquidity, which is conditional for everything else.

Protection against forced selling, which is its most valuable function in a portfolio.

Optionality: the ability to act, to rebalance, or to withstand a shock.

And, within deposit protection limits, protection against institutional failure.

What it costs

The trade-off.

Real returns on cash have historically been low and frequently negative after inflation.

Which means holding cash over long periods has a substantial opportunity cost relative to investing.

The cost is invisible because the nominal balance does not fall, which is why excessive cash holdings persist for decades without being noticed.

Surveys of household holdings consistently find substantial cash balances held for very long periods, which is a large aggregate loss of purchasing power.

How much to hold

The functions determine the amount.

Emergency fund: several months of essential expenditure, sized by income stability, sick pay, dependants and other circumstances.

Sinking fund for predictable irregular costs.

Money needed within about five years, since a market fall within that period cannot be recovered.

For anyone drawing on a portfolio, a buffer of one to three years of withdrawals to avoid selling during declines.

And that is generally the total — anything beyond it is a decision requiring a reason.

The common errors

In both directions.

Too little: no emergency fund, meaning any shock forces borrowing or selling investments at a bad moment.

Too much: large balances held for decades earning below inflation, frequently through inertia or through waiting for a better moment to invest.

The second is less discussed because it produces no dramatic event, only a shortfall decades later.

And both are avoided by deciding the amount deliberately based on function.

Where to hold it

Practically.

Instant access for the emergency fund, since accessibility is the point.

Higher-paying easy access or notice accounts for money needed within a year or two.

Fixed-term deposits for money with a known date beyond a year.

Money market funds, which are used within investment accounts and which are not deposits and are not covered by deposit protection — a distinction worth knowing.

And within deposit protection limits, checking that the limit applies per banking licence rather than per brand.

The rate matters more than people think

An easily corrected loss.

The gap between the best and worst easy-access savings rates is frequently substantial, and providers rely on inertia — legacy accounts closed to new business routinely pay far less.

Bonus rates expire.

Which means checking your rate against current best-buy tables annually is one of the highest hourly returns available in personal finance.

And cash held within investment platforms frequently earns little, with the platform retaining a share of the interest, which attracted regulatory attention in several markets during periods of higher rates.

Cash versus short bonds

A question that recurs.

Cash has no duration risk and no credit risk within protection limits.

Short-duration bond funds have modest duration risk, some credit risk depending on holdings, and typically slightly higher yields.

Money market funds sit between.

Which of these is preferable depends on the rate environment, the amount and the horizon, and none of them is a permanent answer.

For an emergency fund specifically, cash in a protected deposit is the correct answer.

Tactical cash

Holding cash to invest later.

Which is market timing, and which requires being right about both the exit and the entry.

Studies of investors holding cash awaiting a better entry point consistently find the wait costly, and the decline that eventually arrives may be from a higher level.

Which means a large cash position held for tactical reasons should be recognised as an active bet rather than as prudence.

And that the reason for holding it should be written down, along with the condition under which it would be invested.

The inflation point

Worth restating.

Cash guarantees the nominal amount and guarantees nothing about purchasing power.

Over a decade at even moderate inflation, the loss is substantial.

Which makes cash the right asset for short horizons and the wrong one for long ones, and makes the amount held a function of when the money is needed rather than of how the market feels.

General information only, not investment advice. Cash loses purchasing power to inflation and investments can fall in value. Consult a regulated financial adviser.