Timing the market vs time in the market: when should you invest?

The start of a new tax year can be a good time to think about investing options, like ISAs for example. But many people worry about when to invest, particularly when financial markets have been volatile. Should you wait for the ‘right time’ or invest as soon as you can? In this article, we’ll look at: 

• What ‘timing the market’ means 
• What ‘time in the market’ means 
• How regular investing can help grow your investments 
• Choosing an approach that works for you. 
   

What does ‘timing the market’ mean? 

At its simplest, ‘timing the market’ means that you try to buy investments when they’re trading at their lowest point, and sell them at their highest - helping you make the best return. This can be particularly tempting during periods of market volatility or uncertainty. 

The challenge is that markets can be unpredictable and can react quickly or not at all to news. That makes it hard to know if stocks are at their lowest level, or if they’ve peaked. It’s a dilemma that even professional investors can struggle to get right consistently.  

Some factors that make timing the market difficult are: 

• Markets move in response to different things, from geopolitical events to the release of new economic data, or even other investor sentiments. 
• Some of the strongest market days can happen unexpectedly, often following downturns. 
• Waiting for ‘certainty’ can mean staying out of the market longer than intended. 
• Missing just a few good days can significantly affect long‑term returns. As we can see from the chart below, if you invested £10,000 in the MSCI World index between 2001 and 2025 and you stayed invested, your investment would be worth £63,421.95. However, if you timed the market and dipped in and out, and missed the best 10, 20, or 30 days (which incidentally occurred in many cases not long after the worst days), then your investment wouldn’t be worth as much. 

What does ‘time in the market’ mean? 

It means investing early and staying invested for the long term rather than trying to predict short-term movements. This allows your investments time to grow and means you can benefit from compounding. Simply put, the longer your money is invested, the more chance it has to grow on top of any growth it’s already achieved.  

Time in the market can help you unlock the power of long-term investing. It can help smooth out short-term volatility, or the normal ups and downs of financial markets. If we look at past periods of volatility, we can see that patient investors are typically rewarded over the long run by sticking to their long-term investing plans and resisting the urge to react to news headlines. 
 

How regular investing can help 

Regular investing is another way to take some of the worry out of market timing. Rather than investing a large amount all at once, you invest smaller amounts on a regular basis - for example, monthly contributions into your ISA. 

This means your money is invested at different market levels over time. When prices are higher, your money buys fewer investments; when prices are lower, it buys more. Over time, this can help reduce the risk of investing everything at a market high. 

For many people, especially those making monthly ISA contributions, this approach can turn market volatility from something to fear into something that simply becomes part of their investing journey. 
 

Choosing an approach that suits you 

There’s no ‘right’ way to invest and everyone’s situation and motivation is different. But there are some areas to consider:  

• How long you plan to invest for (typically a minimum of 5 years). 
• Your attitude to risk. 
• What your financial goals are. 

It’s fine to start cautiously and stay cautious, or you might find your confidence builds over time. 
 

Key takeaways 

You can’t control market movements, but you can control:  

• How much you invest. 
• How regularly you invest. 
• How long you stay invested. 

Focussing on your long‑term goals rather than short‑term noise, means you can make more considered decisions.