How Much to Save for Retirement (and When to Start)

"How much do I need to retire?" is one of the most anxiety-inducing questions in personal finance — and one of the most avoided. The good news is that how much to save for retirement follows some simple rules of thumb, and the earlier you start, the less you actually need to put away, because compound interest does most of the work. This guide walks through the numbers with worked examples.

You can model your own retirement pot with our Compound Interest Calculator. First, let's tackle the big question of how much.

How much to save for retirement: the rules of thumb

Nobody can predict the future precisely, but a few widely used guidelines give a sensible starting point:

• The 15% rule — aim to save around 15% of your gross income for retirement, including any employer pension contributions.
• The 25x rule — to retire, aim for a pot roughly 25 times your desired annual retirement spending.
• Age-based targets — one popular benchmark suggests having roughly your annual salary saved by 30, three times by 40, and so on.

These are starting points, not gospel. The 25x rule, for instance, is based on the idea that you can withdraw about 4% of your pot each year without running out.

Worked example: the 25x rule

Suppose you want £30,000 a year to live on in retirement, and you expect the State Pension (or equivalent) to cover part of it — say £11,500. That leaves £18,500 a year to come from your own savings:

• 25 × £18,500 = £462,500 target pot

That number looks intimidating. But here's the crucial point: you don't save £462,500 out of your own pocket. Most of it comes from investment growth over decades — the very thing we explain in our guide to how compound interest works.

Why starting early beats saving more

The most important variable isn't how much you save — it's how long your money compounds. Consider two savers, both earning 7% annual growth:

• Early starter saves £200/month from age 25 to 35, then stops. Total contributed: £24,000.
• Late starter saves £200/month from age 35 to 65. Total contributed: £72,000.

By 65, the early starter — who contributed a third as much — often ends up with a larger pot, purely because their money had an extra decade to compound. This is the single most valuable lesson in retirement saving: time in the market beats the amount you save.

Make use of tax-advantaged accounts

Wherever you live, retirement saving is usually boosted by tax breaks. In the UK, workplace pensions come with employer contributions and tax relief; in the US, 401(k) and IRA accounts offer tax advantages. Always capture any employer match first — it's free money and an instant 100% return before any growth. If you're budgeting how much you can afford to contribute, check your real take-home first with our take-home pay guide.

Adjust as life changes

Your target isn't fixed. Pay rises, career breaks, children and changing goals all shift the picture. Revisit your plan every year or two, increase contributions when your income rises, and let compounding do the rest. Small, consistent increases have an outsized effect over decades.

Frequently asked questions

How much should I save for retirement?

A common guideline is to save around 15% of your gross income, including employer contributions. To estimate your target pot, multiply your desired annual retirement spending (after any state pension) by 25.

How much do I need to retire on £30,000 a year?

Using the 25x rule, and assuming a state pension covers part of it, you might target a private pot of around £460,000 to fund £18,500 a year yourself. Most of that comes from investment growth, not your own contributions.

Is it too late to start saving for retirement?

It's never too late, but starting earlier dramatically reduces how much you need to contribute, because compound growth does more of the work. If you start late, higher contributions and capturing employer matches become even more important.

Why does starting early matter so much?

Because compound growth accelerates over time. Money invested in your twenties has decades to grow, so an early saver can end up with more than a late saver who contributes far more, simply due to extra years of compounding.

What is the 4% rule?

It's the idea that you can withdraw about 4% of your retirement pot in the first year, adjusting for inflation thereafter, with a good chance of not running out over a long retirement. It's the basis of the 25x savings target.

This article was last reviewed in 2026. It is for general information only and does not constitute financial advice. Investment values can fall as well as rise.