“How much should I be investing?” is one of those questions that sounds simple but tends to spiral the moment you actually try to answer it. Search online and you’ll find everything from “invest 10% of your income” to “invest 50% and live like a student forever” to elaborate spreadsheets that ask for twelve different inputs before spitting out a number that feels completely disconnected from your actual life.
So let’s try to do this properly — without pretending there’s a single magic percentage that applies to everyone, but also without dodging the question entirely. Because the honest truth is that most people in the UK either aren’t investing at all, or are investing without any real sense of whether the amount makes sense for their situation. Both of those are fixable.
Let’s Start With the Average UK Salary
To make this concrete, we need a starting point. According to the latest ONS figures, average weekly earnings in the UK sit at around £745 (total earnings, including bonuses) or £692 for regular pay — which works out to roughly £36,000–£38,800 a year for a full-time worker on average earnings.
Take someone on £35,000 a year, which is close to this average. After income tax and National Insurance, but before any pension contributions, their take-home pay works out to roughly £2,393 a month. That’s the number we’re going to work with — but obviously, adjust it for your own situation, because £35,000 in London buys a very different life to £35,000 in Glasgow or Cardiff.
For context: a comfortable single-person budget in London in 2026 sits at roughly £3,000 net per month, which means someone on the UK average salary living in London is likely to be under real pressure before they even think about investing. In Manchester or Birmingham, that comfortable baseline drops to around £2,200–£2,500 net per month — much closer to the average earner’s actual take-home pay. Location matters enormously here, and it’s worth being honest with yourself about which camp you fall into.
The Percentage Everyone Quotes — and Why It’s Not Wrong, Just Incomplete
The most commonly cited figure is 10–20% of take-home pay, with many financial commentators settling on roughly 15% as a reasonable long-term target through your working life.
On our example salary of £2,393 a month take-home, 15% works out to about £359 a month. At 10%, that’s £239. At 20%, it’s £479.
Here’s the problem with stopping there: these percentages assume you’ve already got the basics sorted — an emergency fund, no high-interest debt, manageable housing costs. For a huge number of people on average UK salaries, especially those renting in expensive cities, that’s simply not where they are yet. Telling someone who’s stretched thin on rent and bills to “just invest 15%” isn’t useful advice — it’s a number that doesn’t connect to their reality.
So rather than starting with a percentage, it’s more useful to think about this as a sequence of priorities, where investing comes after certain other things are in place — but not so far after that you keep pushing it off indefinitely.
The Order That Actually Makes Sense
Step 1: Workplace Pension — Don’t Skip This, Ever
Before we even talk about “investing” in the sense of ISAs and stocks, there’s something that should come first for almost everyone: your workplace pension.
If you’re employed in the UK, auto-enrolment means your employer should already be contributing to a pension on your behalf — typically a minimum of 3% of your qualifying earnings, with you contributing at least 5% (often taken before tax, so it costs you less than it sounds). Some employers match contributions above this minimum, sometimes significantly.
If your employer offers to match additional contributions above the minimum and you’re not taking advantage of it, that’s effectively free money you’re leaving on the table — often a better return than anything else available to you, instantly, with no risk. Before increasing investments anywhere else, check your pension contribution rate and whether your employer matches more than the legal minimum. This step costs nothing extra in many cases and should genuinely come first.
Step 2: Emergency Fund — Three to Six Months of Expenses
This is the unglamorous bit that almost every investing guide mentions and almost everyone skips, because it doesn’t feel like “progress” the way watching an investment portfolio grow does.
But here’s why it matters specifically in the context of this question: if you start investing in a stocks and shares ISA without an emergency fund, and then your boiler breaks, your car fails its MOT, or you lose your job, you may be forced to sell investments at exactly the wrong time — potentially at a loss, definitely interrupting the compounding that makes investing worthwhile in the first place.
Three to six months of essential expenses, sitting in an easy-access savings account earning a decent rate (the best easy-access accounts are currently around 4.5–5% AER), is the foundation everything else sits on. For someone with monthly essential costs of £1,500, that’s £4,500–£9,000. It sounds like a lot, and for many people it takes a year or more to build — which is fine. Build it steadily while also starting to invest small amounts; it doesn’t have to be sequential in a rigid sense, but it should be a genuine priority.
Step 3: High-Interest Debt — Pay This Down First
If you’re carrying credit card debt at 25%+ APR, or an expensive personal loan, paying that down delivers a guaranteed “return” equal to the interest rate you’re avoiding. No investment reliably returns 25% a year. This isn’t close.
This doesn’t mean you can’t do both simultaneously — but if you’re choosing between an extra £100 a month toward a 27% APR credit card or putting it into a stocks and shares ISA expecting 5-7% average annual returns, the maths heavily favours the debt.
Step 4: Now — Investing
Once your pension is contributing at a sensible level, you have at least a starting emergency fund (even if it’s not fully built yet), and you don’t have expensive debt hanging over you, this is where the “how much should I invest” question actually becomes meaningful.
So, What’s the Actual Number?
Here’s a practical framework based on take-home pay, adjusted for the reality that most people on average UK salaries are not starting from a position of having everything else perfectly sorted.
If you’re just starting out: Start with what’s genuinely sustainable, even if it’s small
The single biggest mistake people make with investing isn’t investing too little — it’s starting with an amount that feels aggressive, found unsustainable within three months, and stopping altogether. A consistent £50 a month that you never miss beats an ambitious £300 a month that lasts six weeks before life gets in the way and you cancel the direct debit.
If you’re on the UK average salary of roughly £2,393 take-home a month, even £50–£100 a month — somewhere around 2–4% of take-home — is a perfectly respectable starting point if that’s genuinely what you can sustain after rent, bills, and a contribution toward your emergency fund. The habit matters more than the amount at this stage.
Once the basics are covered: Aim for 10–15% of take-home pay
This is the range most financial commentators land on, and it’s a sensible target for most people in steady employment with their pension, emergency fund, and debt situation reasonably under control. On £2,393 a month, that’s £239–£359 a month.
This doesn’t need to all go into a single account or product. A natural split for many people looks something like: continuing pension contributions (separate from this figure, since it usually comes straight from salary), a stocks and shares ISA for medium-to-long-term goals, and potentially a Lifetime ISA if you’re under 40 and saving toward a first home (where the 25% government bonus makes the “return” on that portion of your investing dramatically better than anything else available).
If you’re behind and want to catch up: 20%+ is achievable but needs to fit your life
Some people — often those starting later, or with a specific goal like early retirement — aim for 20% or more of take-home pay. On £2,393, 20% is £479 a month, and 25% would be roughly £598.
This is genuinely achievable for people without dependents, with manageable housing costs, or with a second income in the household. It’s considerably harder for a single person renting in London on the average salary, where £479 a month might represent a fifth of their entire take-home pay after rent alone could already be 40-50% of it.
The honest answer here: 20%+ is a great target if your circumstances allow it, but it shouldn’t become a source of guilt if your circumstances genuinely don’t. There’s a difference between “I could invest more if I cut back on takeaways” and “I could invest more if rent wasn’t 55% of my income” — and only one of those is something most people can simply choose to fix.
What Difference Does the Amount Actually Make? The Power of Starting Early
This is where the numbers get genuinely compelling, and it’s the strongest argument for starting with something — even a modest something — rather than waiting until you can “do it properly.”
Consider someone investing £200 a month from age 25 to age 65, assuming an average annual return of 5% (a reasonable long-term assumption for a diversified portfolio, though not guaranteed — investments can go down as well as up). Over those 40 years, they’d accumulate over £300,000.
Now consider someone who waits until 45 to start, investing the same £200 a month for the remaining 20 years to age 65 at the same 5% return. They’d end up with roughly £82,000.
Same monthly amount. Same rate of return. The only difference is 20 years of start time — and the outcome is nearly four times larger for the person who started earlier. This is compound growth doing the heavy lifting: the returns on your early contributions themselves go on to generate further returns, year after year, and that effect compounds dramatically over decades.
The practical takeaway: if you’re in your 20s or early 30s reading this and thinking “£100 a month feels too small to bother with” — it isn’t. £100 a month from 25 to 65 at 5% would get you to roughly £150,000, purely from that one habit, before any pay rises or increases along the way.
A Worked Example: Putting It All Together
Let’s take someone on £35,000 gross (£2,393 net per month), living outside London, with manageable rent, no high-interest debt, and a basic emergency fund already in place. A realistic monthly breakdown might look like:
- Workplace pension: 5% employee contribution (likely already deducted before this take-home figure, or close to it — check your specific payslip)
- Stocks and shares ISA: £200/month (roughly 8% of take-home) — for medium-to-long-term goals
- Lifetime ISA (if under 40 and saving for a first home): £200/month — receives a £50 government bonus on top, making it £250/month of effective saving toward a deposit
That’s £400 a month — about 17% of take-home — going toward their future, split between general long-term investing and a house deposit with a government top-up attached. For someone earning the UK average salary with their basics covered, this is a genuinely solid position, and it’s achievable without an extreme budget.
If that £400 feels like too much right now, halving it to £200 a month total — split however suits your goals — still puts you meaningfully ahead of someone investing nothing, and the compounding maths above shows just how much that adds up to over time.
A Note on Where to Invest
This article is about how much, not specifically where — that’s a topic for its own guide. But briefly: for most people starting out, a low-cost diversified global index fund held within a stocks and shares ISA (so all growth and income is tax-free) is the simplest, most evidence-backed starting point. Platforms like Vanguard, Fidelity, and various app-based investing platforms make this accessible with low minimum contributions — often £25–£50 a month is enough to get started.
Also Read: Where and how to invest in the United Kingdom
The tax wrapper matters here too. Whatever amount you settle on, doing it inside an ISA rather than a general investment account means no capital gains tax and no tax on dividends — which is particularly valuable if your investments do well over the long term and you’d otherwise start bumping into capital gains tax thresholds.
Conclusion
If you want a single number to walk away with: 10–15% of your take-home pay is a sensible long-term target for most people on an average UK salary, once a pension is contributing, an emergency fund is at least underway, and expensive debt isn’t hanging over you.
But if you’re not there yet — if 10% feels impossible right now — don’t let that stop you from starting with whatever you genuinely can. £50 a month, started now, beats £300 a month started in three years’ time after you’ve finally “got everything sorted.” The maths overwhelmingly favours starting small and early over waiting for the perfect moment to start big.
The question isn’t really “how much should I be investing?” in isolation — it’s “what’s the most I can invest consistently, without it becoming something I quietly stop doing in four months?” Answer that question honestly, and you’ll have your number.
Disclaimer: This article is for informational purposes only and does not constitute financial advice. Investment returns are not guaranteed and the value of investments can go down as well as up. Figures used are illustrative examples based on assumed rates of return, not forecasts or promises. Always consider your own circumstances and speak to a regulated financial adviser before making investment decisions.