If you're planning to retire before 55 — or even before 67 — there's a period where your pension isn't available and the State Pension hasn't started. Here's how to fund that gap without running out of road.
When people think about retirement planning, they tend to think about the pension.
How big is it? When can I get it? Will it last long enough?
All reasonable questions. All important. But they miss something that is, for early retirees, arguably more pressing than any of them.
The gap.
The period between the day you stop working and the point at which your pension becomes fully available and your State Pension kicks in. For someone retiring at 58 - as I have - that gap runs to roughly nine years before the State Pension arrives at 67, and two years before pension access age rises to 57 in 2028. It's the period where you're living on something other than a pension, because the pension either isn't accessible yet or isn't the right thing to be drawing from heavily.
That gap needs to be funded. And working out how to fund it — what to draw from, in what order, with what tax efficiency — is one of the most practical and important planning challenges in early retirement.
This post is about building what I've come to think of as the retirement bridge.
Why the gap matters more than people realise
Let me be precise about the timeline, because the numbers matter.
Pension access age is currently 55, rising to 57 from April 2028. State Pension age is currently 67, rising gradually from 66 over the next couple of years. So if you stop work at 58, as I have, the period before the State Pension arrives is nine years. If you stop at 55, it's twelve years. At 50 it's seventeen.
That's a long time to be living without the two income sources - pension and State Pension - that most retirement planning assumes will be the foundation.
Now - you can access a defined contribution pension from 55 or 57. You're not locked out completely. But there are good reasons not to draw heavily from it early. The pot that you don't draw from continues to grow. Strategic pension drawdown - managing how much you take and when - can significantly reduce your lifetime tax bill. And the sequence of returns risk - the danger that poor investment performance early in retirement, combined with ongoing withdrawals, permanently damages the pot - is most acute in the early years.
So the question isn't just "what can I access?" It's "what should I be living on during the gap years, so I can leave the pension to grow and draw from it more efficiently later?"
That's what the bridge is.
The three layers of the bridge
The most robust approach to funding the gap uses three distinct layers, each serving a different purpose and operating on a different timescale.
1. Layer one — cash
The first layer is accessible cash. Money that is available immediately, regardless of what markets are doing. This covers your near-term living costs - the next one to three years of outgoings - and it means you never have to sell investments during a market downturn just to pay next month's bills.
For most people this means a combination of Cash ISAs and regular accessible savings accounts. Money that earns a reasonable return but can be accessed at any time without penalty and without market risk.
The cash layer is your buffer. It insulates everything else from short-term pressure. And it gives you the psychological security of knowing that the immediate future is covered regardless of what happens to investment values.
How much should be in the cash layer? A rough rule of thumb is one to three years of annual expenditure. Enough to weather a significant market downturn without needing to touch the invested layer. Not so much that large sums are sitting in cash indefinitely while inflation quietly erodes their real value.
2. Layer two — invested ISAs
The second layer is a Stocks and Shares ISA - money invested in a diversified, low-cost fund, intended to be held for at least five years and ideally longer. This layer grows over the medium to long term, provides the inflation protection that cash can't, and can be drawn from tax-efficiently when the cash layer needs topping up.
The crucial point about ISA withdrawals is their tax treatment. They are entirely tax free. They don't count as income. They don't affect your personal allowance. They don't interact with pension withdrawals in a way that creates unexpected tax consequences.
For an early retiree managing their income carefully - trying to stay within the personal allowance, trying to minimise taxable income - ISA withdrawals are the most efficient source of retirement income available. Every pound you draw from an ISA is a pound that costs you nothing in tax.
This is why building an ISA pot before retirement matters so much. And why the annual ISA allowance - £20,000 per person, or £40,000 between a couple - is one of the most valuable planning tools available in the gap years.
3. Layer three — the pension
The third layer sits behind everything else. The pension pot - not being drawn from heavily in the early years, continuing to grow, waiting to be deployed strategically once the State Pension arrives and the income picture is clearer.
The reason for keeping pension drawdown modest in the early years isn't just about letting the pot grow. It's about tax positioning. In the years before the State Pension kicks in, your personal allowance is fully available. If you're living mainly on ISA withdrawals you might be paying virtually no income tax at all. Once the State Pension arrives - currently around £12,548 a year - it consumes most of your personal allowance, meaning any pension drawdown on top of it starts getting taxed from the first pound.
So the optimal strategy for most early retirees is to front-load ISA withdrawals in the gap years, use the personal allowance efficiently for modest pension drawdown where it makes sense, and preserve the pension for the later years when the State Pension has arrived and income needs may have shifted.
This is called income sequencing — managing which source you draw from and when. Done well it can save significant amounts in tax over a retirement lifetime. Done carelessly it can result in unnecessarily large tax bills that a bit of planning would have avoided entirely.
Being honest about my own bridge
I want to be transparent about where I am — because I think honesty about real situations is more useful than abstract frameworks.
My bridge is not as substantial as I'd like it to be. And that's a direct consequence of a decision I made over many years — to prioritise paying off the mortgage rather than building an ISA pot. See article for pros & cons of this.
I don't regret that decision. Being mortgage free has transformed what's possible for us in retirement. The income I need to live comfortably is significantly lower without a mortgage payment. The psychological security of owning our home outright is real and valuable. And in terms of the overall balance sheet - the equity we built by paying down the mortgage is genuinely part of our financial picture even if it isn't an accessible income source.
But it does mean that my ISA pot is relatively modest. I only started investing in Stocks and Shares ISAs seriously in the last couple of years. I've been cautious — starting with small amounts, getting comfortable with the volatility, gradually increasing as my understanding and confidence grew.
The inheritance from my parents provides a capital buffer that sits alongside the ISA. Accessible money outside any formal wrapper, which I'm gradually transferring into ISAs year by year using the annual allowance — moving it into a tax-efficient environment at the rate of £20,000 a year rather than all at once.
My wife is still working. Her income covers a meaningful share of our household costs, which reduces the pressure on my own pot significantly. I want to be clear about that — it changes the maths in my favour in a way that not everyone will have available. The bridge I need to build is shorter and less load-bearing than it would be for someone whose household income has gone entirely to zero.
And there's the pension itself. I'm past the current access age. I can draw from it now if I need to. But my intention is to leave it largely untouched for as long as the ISA and cash layers can sustain the income I need — letting it grow, preserving the tax-free cash, and drawing it down strategically once the State Pension arrives.
That's the plan. It's a work in progress, not a finished structure.
The sequencing risk problem
There's one more thing worth understanding before you build your bridge - and it's the risk that undermines early retirement plans more often than any other single factor.
Sequencing risk is the danger that a run of poor investment returns in the early years of retirement permanently damages your long-term pot. Not because the investments are bad - but because of the timing.
Here's how it works. Suppose your invested pot falls 30% in year two of retirement. If you're drawing a fixed income from it regardless, you're selling more units to generate the same income. When the market recovers - as historically it has, over time - you have fewer units to benefit from the recovery. The pot that existed on day one of retirement is smaller in the long run than the same pot would have been if the downturn had happened later.
The three-layer approach is specifically designed to solve this problem. If your near-term income needs are covered by cash, you don't need to sell investments during a downturn. You wait. You let the invested layer recover. You only draw from it when the timing is right — not when the bills are due.
This is why the cash layer isn't just idle money sitting around doing nothing. It's sequencing risk insurance. The cost of holding it in lower-return cash is the premium you pay for the protection it provides.
What about the 4% rule?
You'll encounter the 4% rule if you spend any time reading about early retirement planning. The idea - based on historical US market data - is that if you withdraw no more than 4% of your invested pot per year, it should last indefinitely. The investment returns over time outpace the withdrawal rate, leaving the pot intact in real terms.
It's a useful starting point for rough calculation. But treat it as exactly that - a starting point, not a guarantee.
The 4% rule was derived from US market data over specific historical periods. UK and global returns may differ. It doesn't account for the specific tax environment you're operating in. It assumes a relatively static withdrawal rate that doesn't reflect how most people actually live. And it was designed for a standard retirement - not for someone potentially drawing on invested assets for thirty or forty years from their mid-fifties.
Most UK financial planners working with early retirees suggest a more conservative withdrawal rate - somewhere between 3% and 3.5% - particularly in the early years when sequencing risk is highest.
That doesn't mean you need 25% more money than the 4% rule suggests. It means being thoughtful about withdrawal rates in the early years and having the flexibility to reduce them if markets perform badly.
Which is exactly what the three-layer approach allows you to do.
A practical checklist for building your bridge
If you're working through this for your own situation, here are the questions worth sitting with.
- How long is your gap? The period between your planned stopping date and when you'll draw the full State Pension at 67. That's the duration your bridge needs to span.
- What does your cash layer look like right now? Do you have one to three years of annual expenditure in accessible cash or Cash ISAs? If not - how do you build it, and how quickly?
- What does your invested ISA layer look like? Is there a meaningful pot that can grow over the gap years and be drawn from when needed? If it's modest - what's the plan for building it, using the annual allowance and any accessible capital you have?
- Are you using both allowances? If you're in a couple, are both partners using the annual ISA allowance? That's £40,000 a year into ISAs between you - a significant asset if used consistently.
- Is there capital outside wrappers that should be moving in? An inheritance, accessible savings, premium bonds — money sitting in taxable or unwrapped form that could be gradually moved into an ISA year by year.
- What is your intended pension drawdown strategy? When will you start drawing it, at what rate, and how does that interact with the State Pension arrival and your personal allowance position?
- And — have you stress-tested the plan? What happens if markets under-perform for three years running? What happens if your partner stops working earlier than planned? What happens if your spending runs higher than you estimated?
None of these questions have universal answers. But working through them specifically — rather than hoping the plan is roughly right — is what turns a bridge into a structure you can actually stand on.
Where to get help
For the practical tools and benchmarks - the PLSA Retirement Living Standards, the State Pension forecast, the pension access age rules.
For independent, non-commercial guidance on income in retirement, the MoneyHelper pensions and retirement hub is the best free starting point.
And for complex decisions around pension drawdown strategy, income sequencing and tax planning in retirement — please take regulated independent financial advice. The interactions between different income sources in retirement are genuinely complex and the difference between a well-sequenced plan and a poorly sequenced one can be measured in tens of thousands of pounds over a retirement lifetime. MoneyHelper's guide to choosing a financial adviser explains what to look for and how to find one.
Final thought
The bridge isn't a perfect metaphor. Real bridges are fixed structures. This one needs to be flexible — adjusting to markets, to changing circumstances, to rules that shift and a life that doesn't follow the plan exactly.
But the core principle holds. You need something solid to stand on during the gap years. Built in advance. Load-tested before you need it to bear your weight. With enough structure that you can cross it without worrying whether it will hold.
That's the work. And the time to start building is before you need to cross.
Tony writes about his personal journey to early retirement at freebefore65.co.uk. He is not a financial adviser. All content reflects his own experience and research and should be taken as a starting point for your own thinking, not as professional advice.
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