For most high earners on £100,000+, the question isn’t whether you’re saving enough. It’s whether you’re saving efficiently.
At your income level, pension contributions, ISA allowances and company share schemes interact with tax rules in ways that can either build wealth significantly faster — or quietly cost you a substantial amount in unnecessary tax. The difference between getting this right and leaving it to default is often measured in hundreds of thousands of pounds over a career and retirement.
This article covers the key areas where high earners either miss opportunities or unknowingly create future tax problems.
Why Tax Planning Has Never Mattered More for High Earners
The assumption that tax burdens on high earners peaked in the 1970s doesn’t hold up to scrutiny. While the headline rates look lower, a decade of incremental policy changes has significantly increased the real tax burden for anyone earning above £100,000.
The key changes: income tax thresholds frozen since 2021, dragging more salary into higher-rate bands each year through fiscal drag. The capital gains tax annual exempt amount cut from £12,300 to £3,000 in three years. The dividend allowance reduced from £5,000 to £500. And the personal allowance withdrawn entirely between £100,000 and £125,140, creating a 60% effective marginal tax rate on income in that band.
Taken together, these changes mean many high earners are carrying an effective tax burden that rivals anything in recent memory. The tools to manage it — pension contributions, ISA allowances, spousal transfers, carry forward, salary sacrifice — are all available and legitimate. What they require is someone who understands how they interact and reviews them together every year.
Consistent, proactive tax planning across pension contributions, ISAs, and shareholdings can realistically save a high earner hundreds of thousands of pounds over the course of a career and into retirement. The complexity is real, but with the right advice, it doesn’t have to feel complicated.
The Pension Annual Allowance and How It Works Above £100,000
Most UK pension savers can contribute up to £60,000 per year and receive tax relief. For high earners, two separate issues apply.
The first is the personal allowance trap. Between £100,000 and £125,140, your personal allowance is withdrawn at a rate that creates a 60% effective marginal tax rate on income in that band. Pension contributions that bring your adjusted net income below £100,000 restore some or all of your personal allowance. This means the tax relief on those contributions can be significantly higher than the standard 40% rate.
The second is the tapered annual allowance. This only applies if your adjusted income exceeds £260,000 (broadly, your total income including employer pension contributions). Above this threshold, your allowance reduces by £1 for every £2 of adjusted income, down to a minimum of £10,000. If you earn between £100,000 and £200,000, the taper generally won’t apply — but the personal allowance interaction above still will.
Carry Forward: Making Use of Previous Years’ Unused Allowances
If you haven’t maximised your pension contributions in recent years, you may be able to use unused allowance from the previous three tax years on top of the current year’s £60,000.
This is particularly useful if you’ve had a strong year, received a significant bonus, or want to make a larger contribution ahead of a retirement date. The mechanics require careful calculation — you need to have been a member of a registered pension scheme in the relevant years, and the available allowance depends on what was actually contributed — but for many high earners, it represents a meaningful pot-building opportunity that goes unused simply because no one has checked.
Salary Sacrifice: Still Effective, With One Change Coming
Salary sacrifice works by redirecting a portion of your gross salary into your pension as an employer contribution. Because the money doesn’t pass through your pay packet, neither you nor your employer pays National Insurance on it.
For employees earning between £100,000 and £125,140, combining salary sacrifice with the personal allowance interaction can make contributions exceptionally tax-efficient. Many employers also pass some or all of their NI saving back to employees as an additional pension contribution, increasing the effective return further.
One change to be aware of: proposed changes from April 2029 may mean that only the first £2,000 of employee pension contributions through salary sacrifice each year will be exempt from National Insurance. For now, the full benefit remains available, and the changes remain under consultation. It is worth reviewing your current arrangement to confirm it is structured to take full advantage while existing rules apply.
ISA Allowances: Use Them or Lose Them, Permanently
The ISA annual allowance is £20,000 per person. Unlike pension carry forward, unused ISA allowance cannot be reclaimed. If you don’t use this year’s allowance by 5th April, it is gone.
For high earners focused on pension accumulation, ISAs can feel like a secondary priority. They shouldn’t be. The reason is simple: pension withdrawals are taxable income. ISA withdrawals are not. A couple drawing £40,000 from ISAs and £40,000 from their pension pays substantially less income tax than the same couple drawing £80,000 from the pension alone. Over a 20 to 40 year retirement, that difference is significant.
For couples where one partner earns less or doesn’t work, the lower-earning partner’s ISA allowance is particularly valuable. Two allowances across a couple means £40,000 per year into a tax-free environment, with no interaction with the tax system on withdrawal.
ISAs and pensions serve different roles in retirement. The pension is the engine for accumulation. The ISA is the tax-free income lever in drawdown. Both need to be built consistently to get the full benefit.
Company Share Holdings: A Tax Problem Most High Earners Ignore
Senior employees in technology, energy, banking, and other sectors often accumulate significant employer shareholdings through share save schemes, performance plans, and discretionary awards. By the time those shares have vested and the lock-in period has passed, many people simply hold them — often for years.
This creates three problems.
Concentration risk
A large holding in a single company, particularly your employer, concentrates risk in exactly the way that diversified investment portfolios are designed to avoid. The history of UK corporate share schemes includes many examples of employees who held on for too long and watched significant paper wealth disappear quickly. Lloyds and RBS in 2008 are well-documented examples, but the same risk exists in any single company, regardless of apparent strength.
If you also hold a global tracker fund in your pension, you likely already have indirect exposure to the largest companies in your sector. A large employer holding on top of this can mean your real concentration risk is higher than it appears.
Ongoing tax drag
Dividends from shares held outside an ISA or pension are taxable at your marginal rate — 45% for additional rate taxpayers above the £500 dividend allowance. Any growth is building a capital gains tax liability that will eventually need to be managed. Leaving this unaddressed doesn’t make the problem smaller; it defers it and often makes it larger.
Currency risk
For employees holding shares in overseas-listed companies, particularly those working for US technology, energy or financial firms, there is an additional layer of risk that sits on top of the underlying share performance: currency exposure.
If your employer shares are denominated in US dollars, euros or another currency, the sterling value of your holding moves with exchange rates as well as share price. A strong dollar-denominated share portfolio can lose significant value in sterling terms during periods of currency weakness, even if the underlying shares haven’t fallen. Equally, currency movements can flatter returns in ways that reverse quickly.
This risk is often invisible to employees who think of their shareholding in dollar terms and rarely convert the figure to sterling. It becomes most relevant at the point of realisation — when shares are sold and the proceeds converted — and particularly so if that realisation coincides with an unfavourable exchange rate. For a large holding, a 10–15% currency movement can represent a meaningful sum.
Currency risk doesn’t change the case for managing the holding systematically — it reinforces it. Holding a concentrated, currency-exposed position in a single employer’s shares for years is taking on multiple compounding risks simultaneously. Cycling the holding into ISAs over time brings the proceeds into sterling and into a diversified, tax-efficient environment, removing the currency exposure along with the concentration and tax drag.
Managing a Large Share Holding Tax-Efficiently
Annual CGT allowance
The CGT annual exempt amount is £3,000 per person. Selling shares up to this amount each year, and reinvesting the proceeds, resets the base cost on that portion of the holding. On its own this makes a modest dent in a large position, but it is the foundation of a systematic approach.
Spousal transfers
Transfers of assets between spouses and civil partners carry no capital gains tax liability. If your partner pays a lower rate of tax or has unused CGT allowance, transferring shares to them before sale allows gains to be realised more efficiently. A couple can together shelter £6,000 of gains annually free of CGT, with further gains taxed at the lower partner’s rate. Used systematically over several years, this can reduce a large embedded gain significantly.
Cycling shares into ISAs
The most effective long-term approach is to sell shares systematically and use the proceeds to subscribe to your ISA (and your partner’s). Once inside the ISA, future growth and income are completely free of tax. For a couple with a £200,000 share holding, five years of consistent ISA funding combined with spousal transfers can move a very significant proportion into a tax-free environment before retirement.
Note: an in specie transfer of shares directly into an ISA is generally not possible, as it constitutes a change of tax wrapper. Shares need to be sold and the cash reinvested. If you are in a lock-in period, plan around when those restrictions lift.
If you have a large company share holding and are not systematically cycling it into ISAs, you are accumulating a tax liability while leaving tax-free retirement income on the table. Both problems grow the longer they are left unaddressed.
Retirement planning specialist Simon Garber says that if you’ve left it too late to transfer the shares, then another potential option is to use this money in the early years of retirement when your income is potentially lower:
“Another option is to front-load using spousal transfers, plus capital gains tax allowances, and use those shares in the early years. And you could even combine them with dividend income, depending on how high their yields are. And then you push your other stuff back for later on or when it’s appropriate to access pensions or money from ISAs or income from pensions, which is taxable.“
Investment bonds
Where pension and ISA allowances are already fully used, or shares need to be held before they can be realised, investment bonds — onshore or offshore — can provide a tax-efficient holding structure. Growth accumulates within the bond without triggering annual tax on dividends or gains. The tax point only arises on withdrawal. If you have retired by then and are a basic rate taxpayer, the effective rate is considerably lower than it would have been during peak earning years.
Surprisingly, premium bonds might also be a useful investment vehicle – the returns aren’t brilliant, and wins can be infrequent. But for higher-rate taxpayers, they can actually be quite handy because wins are tax-free – therefore a 40% tax payer is actually earning 40% more on their winnings.
Investment bonds are not a substitute for ISAs — withdrawals are subject to income tax rather than being tax-free — but for high earners with assets beyond their annual allowances, they are a legitimate and often underused option.
As long as you are a basic rate taxpayer, there’s no additional income on encashment, so these could be an effective early-retirement planning tool. Also, you can take 5% annually without declaring for up to 20 years.
The Annual Review That Most High Earners Don’t Do
Pension allowances, carry forward, salary sacrifice, ISA subscriptions and share cycling all require active, annual attention. None of this happens automatically, and the consequences of a missed tax year are permanent — you cannot reclaim a lost ISA allowance or undo a year of avoidable tax.
A proper annual review covers: pension contributions relative to adjusted income, ISA subscriptions for both partners, any share holdings due for tax-efficient realisation, and whether carry forward is available and worth using. These decisions interact, and the value of reviewing them together rather than separately is significant.
If you earn above £100,000, have company shares, and haven’t had a conversation that covers all of the above in the same meeting, it’s worth having one.
