Retirement planning is, at its heart, a gap analysis exercise. On one side sits your target retirement income — what you need to maintain your lifestyle, fund your aspirations, and absorb the unpredictable costs of later life. On the other sits your projected income from all sources: state pension, occupational schemes, personal pensions, savings, property, and any continued earnings. The difference between these two figures is the retirement income gap, and quantifying it precisely is the foundation of every credible retirement plan.
This guide explains how to calculate that gap, stress-test your assumptions, and select from the planning strategies available to close it. It is written for HNW professionals and internationally mobile individuals whose income sources are typically more varied — and more complex — than those of the average saver.
Why the Gap Is Almost Always Larger Than Expected
Most people, when they first sit down to think about retirement income, significantly underestimate their needs and overestimate their projected receipts. Several biases are at work.
Lifestyle inflation blindness. Current spending is a poor proxy for retirement spending. Golf memberships, regular international travel, private healthcare, and multigenerational gifting are all common features of an affluent retirement that do not feature in today's budget.
Longevity underestimation. A 60-year-old professional should plan for a 30-year retirement, not a 20-year one. Actuarial tables suggest a roughly 50 per cent chance that one member of a couple alive at 65 will still be alive at 90. Running out of money at 85 is not an abstract risk.
The retirement spending curve. Spending is not linear through retirement. Research consistently shows a "smile" curve: higher in early "go-go" years (travel, leisure, large purchases), lower in middle "slow-go" years, then rising again in later "no-go" years driven by care costs. Simple annualised projections miss this pattern entirely.
Inflation compounding. At 3 per cent per year, purchasing power halves in 24 years. A retirement income that feels comfortable at 65 may feel inadequate by 85 if it has not been indexed.
Step One: Defining Your Target Income
Begin with today's expenditure, then adjust. A useful framework:
Essential expenditure: housing costs (if any mortgage remains), utilities, food, insurance, basic healthcare, transport. These form the floor.
Comfortable expenditure: discretionary lifestyle spending — dining, holidays, hobbies, charitable giving, helping children or grandchildren financially.
Aspirational expenditure: major items — extended travel, second property, significant gifts, philanthropic endowments.
Most financial planners work to two figures: a "minimum" income that preserves dignity and security, and a "target" income that fully funds the life the client wants. The gap analysis applies to the target figure.
Do not forget:
- Care costs. The average cost of a full-time UK residential care home in 2026 exceeds £55,000 per year; nursing home care is higher. Planning for this is not pessimism — it is prudence.
- Mortgage or debt repayment that may extend into retirement.
- School or university fees for younger children or grandchildren.
- Currency considerations if you plan to spend in a currency other than the one your pension pays.
Step Two: Projecting Income from Existing Sources
Map every income source with realistic assumptions:
UK State Pension. As of 2026/27, the full new State Pension is approximately £12,550 per year (£241.30 per week). Check your National Insurance record via the HMRC online service. Shortfalls can often be addressed with voluntary Class 3 NI contributions — a potentially valuable return on a modest outlay.
Defined Benefit (DB) pensions. Obtain a current benefit statement showing the accrued annual pension at normal retirement date, any early retirement penalties, survivor benefits, and escalation provisions. DB income is typically CPI or LPI-capped, so model the real-terms erosion.
Defined Contribution (DC) pensions. Project forward using a reasonable growth assumption — typically between 4 and 6 per cent per year net of charges for a diversified portfolio, though this will vary. Apply charges carefully; 1.5 per cent annual management charge meaningfully reduces a 30-year projection compared with 0.4 per cent.
ISAs and investment accounts. These provide flexible, tax-efficient capital that can supplement pension income. Model a sustainable withdrawal rate — typically 3.5 to 4 per cent per year from a diversified portfolio, though this depends on asset allocation and time horizon.
Rental income. Net yield after voids, maintenance, management fees, and tax. Bear in mind rental income is fully taxable, so gross yields need discounting for higher and additional rate taxpayers.
Business interests and equity. If you hold a stake in a business that you plan to realise, model a conservative exit valuation, discounted for illiquidity and execution risk.
Step Three: The Gap Calculation
Sum your projected income streams and compare with your target. If projected income is £60,000 per year and your target is £90,000, the gap is £30,000 per year. Capitalised over 30 years at 2 per cent real return, that gap represents approximately £670,000 of additional capital required today — a sobering figure that illustrates why early analysis matters.
The gap is not a static number. It changes with:
- Years until retirement (more time = more compounding working in your favour)
- Contribution and savings rates between now and retirement
- Investment returns in the accumulation phase
- Inflation in the decumulation phase
- Sequence of returns — poor early returns in retirement damage portfolios more than poor late returns
Closing the Gap: Strategies and Trade-offs
Once the gap is quantified, planning turns to solutions. They broadly fall into four categories.
1. Accumulate More
The most obvious route is to save and invest more before retirement. The levers are:
Pension contributions. Pension contributions attract income tax relief at the marginal rate — 40 per cent for higher rate taxpayers, 45 per cent for additional rate. Employer contributions through a salary sacrifice arrangement also avoid National Insurance for both employer and employee. The Annual Allowance (£60,000 in 2026/27, subject to the tapered annual allowance for very high earners) constrains how much can be contributed each year with relief, but carry-forward rules allow use of unused allowance from the three prior tax years.
ISA contributions. The annual ISA allowance is £20,000. Growth and income within an ISA are tax-free, and unlike pensions, ISA withdrawals do not count as income for tax purposes — making them particularly valuable in drawdown to manage the marginal rate.
Investment bonds. Offshore investment bonds can be a tax-efficient wrapper for additional savings above ISA and pension limits, particularly for higher rate taxpayers who expect to retire as basic rate taxpayers or who plan to assign the bond to lower-taxing beneficiaries.
2. Work Longer or Work Differently
Each additional year in employment adds a year of contributions and removes a year of drawdown — a double benefit. Phased retirement (reducing hours or moving to consultancy) allows continued pension contributions while accessing some income. For many professionals, working to 62 rather than 60 has a transformative effect on funding adequacy.
3. Adjust Spending Expectations
A difficult conversation, but a necessary one. Some clients choose a slightly lower-spending retirement in their early years to preserve capital for later care. Others choose to spend more freely in early retirement on the basis that capacity and desire for active living decline with age.
4. Optimise Withdrawal Strategy
How assets are withdrawn matters as much as how much is withdrawn. Key considerations:
Tax diversification in drawdown. Drawing from pensions (taxable), ISAs (tax-free), and investment accounts (CGT implications) in a sequenced manner can significantly reduce the total tax paid over a retirement. A financial adviser can model the optimal sequencing year by year.
Asset allocation in retirement. A portfolio heavily weighted to bonds will produce less income over time than a balanced portfolio, but with lower volatility. The appropriate asset allocation depends on the size of the gap, the presence of guaranteed income (DB pension, State Pension), and the client's risk tolerance.
Annuity as a floor. Guaranteed annuity income, even at modest rates, can remove longevity risk and provide a baseline that supports holding growth assets elsewhere. Enhanced annuities (for those with health conditions) can offer materially better rates.
International Dimensions
For internationally mobile professionals, the gap analysis carries additional complexity:
Currency mismatch. A UK pension paying sterling into a retirement spent in euros, dirhams, or Thai baht introduces exchange rate risk. Currency hedging, or holding income-generating assets in the currency of spending, mitigates this.
Multiple state pensions. Some individuals will have accrued state pension entitlements in more than one jurisdiction. These need to be mapped, as double tax treaty provisions will affect which country taxes each payment.
Tax on withdrawals abroad. The country of residence at the point of withdrawal determines the tax treatment of pension income, not always the UK. QROPS (Qualifying Recognised Overseas Pension Schemes) may be relevant for those leaving the UK permanently.
Common Mistakes in Gap Analysis
- Projecting future value but comparing with today's income needs (ignoring inflation)
- Forgetting that pension income is taxable, reducing its net spending power
- Assuming all retirement spending is equal year-to-year
- Ignoring the impact of care costs, which can rapidly deplete capital
- Relying on property as a liquid retirement asset without factoring in illiquidity, downsize timelines, or emotional attachment
- Neglecting state pension entitlements — especially for high earners who may have dismissed it as negligible
The Role of a Financial Planner
A qualified financial planner with cashflow modelling software (Voyant, Truth, Quilter Cashflow Planner, and similar) can produce a lifetime projection that integrates all income sources, applies inflation, models sequence-of-returns risk, and runs multiple scenarios — best case, base case, and worst case. This provides not a prediction, but a framework for decisions: how much to save, what to invest in, when to retire, and how to drawdown efficiently.
The gap analysis is not a once-done exercise. It should be revisited at every significant life event — a change of job, divorce, inheritance, property sale, or business exit — and at least annually as retirement approaches.
This guide is for general information only and does not constitute regulated financial advice. Tax rules and pension legislation change frequently. The value of investments can fall as well as rise; you may get back less than you invest. Seek advice from a suitably qualified financial adviser before taking any action.
How Global Investments Can Help
At Global Investments, our financial planning specialists work with HNW professionals and internationally mobile individuals to build comprehensive retirement income projections that account for multi-jurisdictional complexity. We use market-leading cashflow modelling tools to quantify your retirement income gap, stress-test your plans against inflation, longevity, and poor market returns, and identify the most tax-efficient strategies for closing that gap.
We consider every dimension of your financial life — pensions, ISAs, investment accounts, property, business interests, and international entitlements — to build a retirement plan that is genuinely resilient. Whether you are 20 years from retirement or approaching it imminently, an early and honest gap analysis is the most valuable planning exercise you can undertake.
Contact our team to arrange a retirement income review.
This guide is for general information only and does not constitute financial advice or a personal recommendation. The value of investments can fall as well as rise and you may get back less than you invest. Tax rules, pension legislation, and investment regulations change — always verify current rules and seek advice from a qualified independent financial adviser before making any financial decisions.