Starting to invest, and when not to

Investing receives disproportionate attention relative to the decisions that determine most people's financial outcomes, and doing it in the wrong order causes real harm.

What should come first

The order that applies to most households.

A small emergency buffer, since without one any shock goes onto credit.

Any employer pension match, which is generally an immediate return that no investment matches.

Clearing high-cost debt, since the interest saved is a guaranteed return exceeding expected market returns.

A full emergency fund of several months of essential expenditure.

Then investing.

Investing while carrying credit card debt at a high rate is a negative-expected-value activity, which is the most common ordering error.

The time horizon rule

Which determines whether to invest at all.

Money needed within about five years generally belongs in cash, since a market fall at the wrong moment cannot be recovered in the timeframe.

Money not needed for many years can tolerate volatility in exchange for expected returns above inflation.

Which means a house deposit for next year is a savings problem and a pension for thirty years' time is an investing problem, and treating either as the other causes damage.

The things that actually determine returns

Where the evidence is clear.

Costs, which are the one variable you control with certainty.

A difference of a fraction of a per cent in annual charges compounds enormously over decades, and low-cost index funds have consistently outperformed the majority of actively managed funds after costs over long periods.

Diversification, across companies, sectors, geographies and asset classes, which reduces risk without reducing expected return.

Time in the market, since returns compound and since missing a small number of the best days substantially reduces long-run returns — which is the argument against attempting to time entry and exit.

Behaviour, where the documented gap between fund returns and investor returns reflects buying after rises and selling after falls.

And tax wrappers, where using available tax-advantaged accounts is a free improvement in net return.

What matters less than people think

Where effort is wasted.

Selecting individual shares, where the evidence on retail stock picking is poor.

Predicting markets and economies, where professional forecasting records are unimpressive.

Timing entry, where lump sum investing has historically outperformed phasing in on average, while phasing reduces regret.

Frequent trading, which increases costs and reduces returns.

And following commentary, which is produced continuously and is mostly noise.

Risk, honestly described

What it means practically.

Investment values fall as well as rise, and falls of substantial magnitude occur periodically and are a normal feature rather than an aberration.

The relevant question is not whether you can tolerate risk in principle but whether you would sell after a large fall — because selling after a fall converts a temporary decline into a permanent loss.

Which means the appropriate allocation is the one you can hold through a bad period, which is generally more conservative than a risk questionnaire suggests.

And past performance does not indicate future returns, which is a legally required statement because it is true.

The simple approach

Which is defensible.

A globally diversified, low-cost index fund or a multi-asset fund matched to your risk tolerance, held in a tax-advantaged account, contributed to regularly, left alone.

Rebalanced occasionally, or automatically within a multi-asset fund.

Reviewed annually rather than daily.

This is unexciting and is what a substantial body of evidence supports for most people.

Where advice is worth paying for

Specific situations.

Large sums.

Complex tax positions.

Defined benefit pension transfers, which require regulated advice in many jurisdictions and where the default answer is generally not to transfer.

Retirement income decisions, which are largely irreversible.

Estate and inheritance planning.

And any situation where you would not know if you were making a serious error.

What to avoid

Where losses cluster.

Anything promising high returns with low risk, which does not exist.

Unregulated investments, including mini-bonds and similar products, which have caused substantial consumer losses.

Cryptocurrency treated as a savings substitute, given volatility and limited protections.

Investments recommended through unsolicited contact or social media.

Anything requiring urgent action.

Complex products you cannot explain to someone else.

And any firm not on your regulator's register, which is a two-minute check.

The proportion point

Worth ending on.

For most households, the financial outcome is determined by income, housing costs, debt, savings rate and pension contributions.

Investment selection matters at the margin and matters far less than whether you are contributing at all.

Which means the most valuable action for most people is increasing the pension contribution rate rather than optimising the fund.

General information only, not investment advice. Investments can fall in value. Consult a regulated financial adviser, and check any firm on your national regulator's register.