How Much Should I Invest? (2026)

“How much should I invest?” is one of the first questions new investors ask, and the honest answer is: as much as you can spare for the long term, but only after a couple of things come first. Here’s a simple framework that works for almost everyone.

Get the foundations in place first

Before investing, two things usually come ahead of it:

1. An emergency fund. Keep around three to six months of essential expenses in easy-access cash. This is your buffer so that a surprise bill or a lost job doesn’t force you to sell investments at a bad time. Investing without one is fragile.
2. Clear expensive debt. Paying off high-interest debt (credit cards, overdrafts) is effectively a guaranteed return equal to that interest rate, which usually beats what you’d expect from investing. Low-rate debt like a mortgage is different and can sit alongside investing.

With those handled, the money left over is what you can invest for the long term.

How much of your income

A useful habit is to pay yourself first: decide on an amount or a percentage of your income, invest it automatically at the start of the month, and live on the rest. Even a small percentage started now is powerful thanks to compounding. Many people aim for something in the region of 10% to 20% of income, but the right number is whatever is sustainable for you. Starting smaller and increasing it over time, especially when your income rises, works well.

Only invest money you won’t need soon

A simple rule: don’t invest money you’re likely to need within about five years. Markets can fall in the short term, and you don’t want to be forced to sell at a loss. Short-term money belongs in cash; long-term money belongs invested. The longer your horizon, the more comfortably you can ride out the ups and downs.

Use your tax allowances

Once you know how much you’re investing, put it somewhere tax-efficient. In the UK that means using your ISA and pension allowances before a taxable account. Across Europe, use any local tax-advantaged wrappers available to you. It’s free money in the sense that you keep more of your returns.

Start, then increase

The amount matters less at the start than the habit. Begin with whatever you can, automate it, and raise it over time. A modest, consistent contribution into a broad low-cost fund will do more than waiting until you can invest a “serious” amount.

The bottom line

Build an emergency fund, clear expensive debt, then invest a sustainable slice of your income, automatically, in tax-efficient wrappers, for money you won’t need for at least five years. The exact figure is personal; the habit is what builds wealth. See what different amounts grow into with the FIRE calculator.

Educational information, not personal or financial advice. Everyone’s situation differs, so consider getting tailored advice if you’re unsure.