You can start investing with as little as £25 a month through a stocks-and-shares ISA or pension, many platforms have no minimum. What matters far more than the starting amount is investing regularly, for at least five years, with money you won’t need in the short term.
The short answer
- You can start from around £25 a month, many platforms have no minimum at all.
- Regular investing, held for at least five years, matters far more than the size of your first payment.
- Clear expensive debt and hold a three-to-six-month emergency fund before you invest.
You genuinely do not need a lump sum to begin. Many stocks-and-shares ISAs and investment platforms let you start from around £25 a month, and some have no minimum at all. What matters far more than the opening figure is investing regularly, over a horizon of at least five years, using money you will not need in the short term. The starting amount is almost a detail; the habit and the time are what build wealth.
Small, regular amounts really do work
Investing a fixed sum each month, sometimes called pound-cost averaging, has a quiet advantage: you automatically buy more units when prices are low and fewer when they are high, which smooths out the bumps and takes the emotion out of timing the market. Given time, modest sums compound into meaningful ones. The table below shows illustrative outcomes over 25 years at an assumed 5% annual growth after charges, for illustration only, and never guaranteed, but it makes the point that consistency beats size.
Illustrative value after 25 years, by monthly amount (5% assumed growth, for illustration only)
| Monthly amount | Total paid in over 25 years | Illustrative value |
|---|---|---|
| £25 | £7,500 | ≈ £14,900 |
| £100 | £30,000 | ≈ £59,500 |
| £250 | £75,000 | ≈ £149,000 |
| £500 | £150,000 | ≈ £297,000 |
Notice that in each row the illustrative value is roughly double what was paid in: that is compounding at work, and it grows more powerful the longer you leave it. Our beginner’s guide to how to start investing walks through opening an account and choosing a first fund.
Get the foundations right first
Before you invest a penny, two foundations matter more than the amount. First, clear expensive debt: credit cards and similar borrowing usually cost far more in interest than investments are likely to earn, so paying them off is effectively a guaranteed return. Second, hold an emergency fund of roughly three to six months’ essential spending in easy-access cash: this is what stops you having to sell investments at a bad moment when the boiler breaks or work dries up.
Only money you can genuinely leave untouched for at least five years should go into the market, because that time horizon is what lets you ride out the inevitable dips. If you have a shorter goal, cash or a savings account is usually the safer home.
Use a tax wrapper, and keep costs down
For most new investors a stocks-and-shares ISA is the natural home: you can put in up to £20,000 a year and all growth and withdrawals are free of income and capital gains tax. A pension is even more tax-efficient for long-term retirement money, thanks to tax relief on contributions, though the money is locked away until at least 55 (rising to 57 from 2028). If retirement saving is your goal, see when to start retirement planning.
Costs compound just as returns do, so a low-cost, globally diversified fund is generally a sounder starting point than betting on individual shares: it keeps charges down and spreads your risk across thousands of companies at once. A difference of even half a percent in annual charges can quietly cost you thousands over a couple of decades, so a cheap, broad tracker fund is usually a better foundation for a beginner than an expensive, actively managed one. If your conscience matters to you, our guide to ethical and sustainable investing shows how to do this without giving up diversification.
Common beginner mistakes to avoid
A few avoidable errors trip up new investors. The first is trying to time the market, waiting for the “perfect” moment to start, or jumping in and out; time in the market almost always beats timing it, which is exactly why regular monthly investing works so well. The second is being under-diversified: putting money into a single share, your own employer, or a fashionable theme, when a global fund spreads your money across thousands of companies. The third is panic-selling in a downturn, crystallising a loss that would most likely have recovered given time. Start early, keep it simple, and leave it alone.
Where larger sums need advice
Starting small is something you can comfortably do yourself. Larger or more complex sums are where advice starts to pay, investing an inheritance, the proceeds of a business sale, or a significant redundancy payment, where the questions of tax, risk and timing carry real weight. Investments can fall as well as rise and you may get back less than you put in; this is information, not personal advice. If you are dealing with a meaningful lump sum, being matched with an FCA-regulated, independently vetted adviser through our investment management service is free and carries no obligation. You can also browse the wider investing library.
In summary
- You can start from around £25 a month, many platforms have no minimum at all.
- Regular investing, held for at least five years, matters far more than the size of your first payment.
- Clear expensive debt and hold a three-to-six-month emergency fund before you invest.
- A stocks-and-shares ISA (up to £20,000 a year) or a pension shelters your growth from tax; low-cost global funds keep costs and risk in check.
- For larger or more complex sums, free matching with a vetted adviser puts tax, risk and timing in expert hands.
Sources and further reading
- Investing basics MoneyHelper
- Check the Financial Services Register Financial Conduct Authority
- Individual Savings Accounts GOV.UK
Read the full guide
For the complete picture, see our in-depth guide: How to Start Investing: A Beginner’s Guide.
Speak to a vetted investment management specialist
This is free information, not personal advice. When you’re ready, we’ll match you with an independently vetted, FCA-regulated specialist, free, and with no obligation.
