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How to Plan for Retirement: A Guide to Building a Sustainable Income
Retirement planning sounds simple in theory
All you need to know is how long you’re going to live, how much you’re going to spend in each of those years, what inflation will be, and what investment returns you’ll achieve. With that, it’s simply a matter of calculation: build a pot large enough so that you spend your last pound as you draw your last breath.
Job done.
Except, of course, none of those variables are knowable in advance. And even if they were, you would still need to factor in your family, your health, your changing priorities, and the uncomfortable reality that life rarely follows a neat financial plan.
Retirement is one of the areas where professional advice does add significant value.
The real risk: not running out of money — running out of time
Most people approach retirement planning with a single overriding fear: what if I run out of money?
It’s a rational concern. No one wants to be financially embarrassed late in life.
But in practice, the opposite risk is often greater — and far less discussed: working too long, missing the years when you are healthy enough to enjoy your time, and deferring life in the name of safety.
You can always make more money. But you can’t make more time.
Good retirement planning is not about maximising wealth. It is about optimising the trade-off between money and time. Or as my old Scots granny would have said — there is no point being the wealthiest skeleton in the graveyard.
Start with a timeline, not a number
The most effective way to approach retirement planning is not to begin with a target pot, but with a timeline.
Map out:
- When you plan to stop working (or reduce work)
- When different income streams begin
- How your spending might evolve over time
This transforms retirement from a vague concept into a structured sequence of phases. This can be accomplished with a spreadsheet or financial planning tools. We use specialist cashflow-modelling software to test different retirement scenarios and stress-test potential outcomes.
Step one: identify your guaranteed income
Some parts of retirement income are relatively predictable. These form the foundation of your plan.
Typically these include:
- The UK State Pension (via HM Revenue & Customs / DWP framework)
- Defined benefit (final salary) pensions
- Rental or other property income
These income streams are often:
- Inflation-linked (fully or partially)
- Reliable
- Payable for life
Together, they form a base layer of income that behaves much like a salary.
A state pension forecast is particularly important.
- State Pension age is currently between 66 and 68 depending on age and date of birth. It’s surprising how many people still think that state retirement age is 65 — which it has not been for years. That’s a nasty shock without prior planning.
- For some retirees, State Pension may use a substantial proportion of their personal allowance.
Understanding this baseline gives you a clear picture of what is already “covered” before drawing on investments. In my experience, this is a first reassuring step in building that plan.
Step two: estimate your spending (properly)
This is where things become less precise.
Most people underestimate how complex retirement spending is.
A proper process involves what I call a “soup to nuts” analysis, including:
- Core living costs (housing, food, utilities)
- Lifestyle spending (travel, hobbies, dining)
- One-off costs (cars, home improvements)
- Family support (children, grandchildren)
- Health and care considerations
And then there are the unknowns:
- Will you slow down and spend less as you age?
- Or remain active — and expensive — for longer?
- Will you need long-term care, and for how long?
This is one of the key reasons professional planning matters. It’s not about precision — it’s about building a robust range of outcomes based on likely spending and legacy desires. We still have to tackle investment and inflation factors, which are other big variables, so it’s important at this stage to use a questionnaire that elicits all possible spending and forces you to think about it.
Retirement income gap
If your desired retirement income is £50,000 per year, and your State Pension and defined benefit pensions provide £25,000, the remaining £25,000 must come from investments. This gap is what your retirement savings need to fund.
Step three: use your investments tax efficiently (this is where planning adds real value)
Retirement income planning in the UK is as much about tax structuring as it is about investment returns.
Pensions: powerful but often misunderstood
Pensions remain one of the most tax-efficient vehicles available.
- 25% can typically be taken tax-free
- 75% is taxable as income
However, timing is everything.
For example:
- If you retire before your state pension begins
- And have no earned income
You may be able to draw from the taxable portion of your pension at very low — or even zero — effective tax rates by utilising your personal allowance.
On the way in, pensions are even more attractive:
- Tax relief at 20%, 40%, or 45%, depending on your tax band when contributing
- Salary sacrifice can enhance this further through National Insurance tax savings
Depending on tax rates at contribution and withdrawal, pensions can provide significant tax advantages.
This can create significant planning opportunities in certain circumstances.
Individual Savings Accounts (ISAs): flexible and tax-free
ISAs provide:
- Tax-free growth
- Tax-free withdrawals
- No impact on income tax bands
They are ideal for:
- Bridging early retirement years
- Managing tax bands in later life
- Providing a long-term tax-free income
It is well known that ISAs give tax-free capital gains and also provide tax-free interest. Many assume that ISAs will be cashed in later in life to take advantage of the tax-free growth aspect. Some investors choose to adjust their asset allocation as retirement approaches, although the appropriate strategy will depend on individual objectives and risk tolerance.
Investment Bonds
Investment bonds are a little-known savings vehicle. They have been around for decades and can be another very useful tool in building retirement income — they can be set up using lump sums, either from pensions or, as often happens at this stage of life, from inheritances.
Investment bonds have useful tax-deferral options and can provide:
- Tax-deferred withdrawals
- Structured income planning opportunities, including dovetailing with inheritance tax and legacy planning
- Withdrawals of up to 5% of the original amount invested on a tax-deferred basis, with unused 5% annual allowances carried forward
They are particularly useful for tax smoothing across retirement phases.
Investment bonds are not suitable for everyone and can involve higher charges, tax considerations and investment risk.
Venture Capital Trusts (VCTs)
VCTs offer:
- 30% upfront income tax relief (subject to qualifying conditions)
- Tax-free dividends
- Capital Gains Tax free growth
For some experienced investors, Venture Capital Trusts can form part of a wider tax-planning strategy. However, they are specialist investments that involve significantly higher risk than most mainstream investments and are not suitable for everyone.
VCTs invest primarily in new and very small companies, which can be more vulnerable to economic and market conditions. As a result, investors may experience greater volatility and a higher risk of capital loss than with more diversified mainstream investments. Any decision to invest should be based on an individual’s objectives, risk tolerance, capacity for loss and overall financial circumstances.
Tax benefits depend on individual circumstances and may change in future.
Building a sustainable income strategy
Retirement planning is not about a single pot — it is about creating a reliable income stream from multiple sources.
A well-structured plan may combine:
- Guaranteed income (state pension, DB schemes)
- Flexible withdrawals (pensions, ISAs)
- Tax-efficient income layers (bonds, VCTs)
The goal is to:
- Improve tax efficiency
- Maintain flexibility
- Reduce the risk of running out of money
Withdrawal strategy: the critical piece
How you draw income matters as much as how you invest.
Key considerations include:
- Sensible withdrawal rates
- Sequencing (which assets to draw on when)
- Tax band management
Modern planning often uses Monte Carlo modelling — running thousands of simulations to test how a plan performs under different market conditions. It is likely that over the course of a long retirement there will be stock market shocks. Accepting this as inevitable and planning accordingly, so as not to panic, is one of the key emotional aspects an experienced planner will help you with.
Modelling tools are based on assumptions and projections and cannot guarantee future outcomes.
Understanding risk and market behaviour is very important, as is understanding your own risk tolerance. It is also important to recognise that apparent safety is not always as safe as it seems. Holding too much in low-return assets may also create risks, particularly where inflation could erode spending power over a long retirement.
This doesn’t predict the future, but it does provide a probability-based framework for decision-making.
Investment strategy: sensible, not speculative
Your investment approach in retirement should reflect:
- The need for income
- The need for longevity
- The need for resilience
This typically means:
- Diversification across asset classes
- Avoiding concentration risk
- Maintaining exposure to growth assets
There is also an increasing case for incorporating ethical and sustainable investing. Some investors choose to incorporate environmental, social and governance (ESG) factors into their investment decisions. This may help align investments with personal values and, for some investors, forms part of their assessment of long-term risks and opportunities.
No investment strategy can eliminate risk, and investment returns are not guaranteed.
Property – the asset of last resort
For homeowners, there is usually still access to capital through downsizing or equity release. Equity release can provide access to housing wealth but may reduce the value of an estate and is not suitable for everyone. It can be a useful option to support a more comfortable or flexible retirement lifestyle. However, it is often better to plan a downsize early, as it can become daunting in later life.
The IHT overlay: retirement planning has changed
A major shift is underway.
The government has introduced changes that could bring many unused pension funds within the inheritance tax framework from April 2027, although final details remain subject to confirmation. With this in mind, retirement planning should no longer be separated from estate planning.
This has several implications:
- Many individuals may now spend pension assets earlier
- Asset drawdown order becomes more important
- Life assurance may play a role in offsetting tax liabilities
Planning that hasn’t been reviewed in recent years may now be out of date.
Retirement isn’t just about you
One of the subtler aspects of retirement planning is this:
Many people will not spend all of their wealth.
Increasingly, pensions and investment portfolios are likely to be passed on to the next generation, or to a family charitable foundation supporting causes you believe in.
This raises important questions:
- What do you want that wealth to do?
- When should it be passed on?
- Under what structure?
Good retirement planning naturally evolves into intergenerational planning.
Again — what’s the point in dying with pots of money and bequeathing it when beneficiaries such as children are themselves getting too old to enjoy it? Better, is it not, to give early when it can ease their journey through life or help pay for grandchildren?
As we say: give with a warm hand, not a cold one.
Then you can take pleasure in seeing the results of your generosity in your lifetime. But you can only do this if you have the confidence that you won’t need the money yourself.
The role of professional advice
Retirement planning sits at the intersection of:
- Tax
- Investment
- Behaviour
- Longevity risk
- Family dynamics
There are simply too many moving parts — and too many unknowns — to treat it as a one-off calculation.
A qualified and experienced adviser can help:
- Model different scenarios
- Structure withdrawals tax-efficiently
- Stress-test your plan
- Adjust strategy over time
- Provide regulated advice backed by professional standards for peace of mind
- Conduct regular reviews to maintain and adjust your plan over time
Most importantly, they help answer the question that actually matters:
“Am I going to be OK?”
The Bottom Line
Retirement planning is not a formula. It is a framework.
The goal is not to die with zero — nor to die with the most.
It is to use your resources to live well, support those you care about, and make informed decisions along the way.
The uncertainty never goes away.
But with a structured plan, sensible assumptions, and the right advice, it becomes manageable.
And if there is a single guiding principle, it is this:
Money is renewable. Time is not.
Frequently Asked Questions About Retirement Planning
It depends entirely on your lifestyle, income needs, and existing assets. A structured plan based on income — not a single target number — is far more reliable.
Important information: This article is for information purposes only and does not constitute personal financial advice or a recommendation to invest. The suitability of any financial planning strategy depends on individual circumstances. Tax treatment depends on individual circumstances and may change in future. The value of investments can fall as well as rise and you may get back less than you invest.
Find out more
Want to make sure your retirement savings will support the lifestyle you want? Get in touch today for personalised advice on building a sustainable retirement income and planning for your financial future.
RISK WARNING
As always with investments, your capital is at risk. The value of your investment can go down as well as up, and you may get back less than you invest. This information should not be regarded as financial advice.