Cash erosion: How High-Net-Worth Investors can protect wealth
Tax, market swings, inflation. Whichever way you look at it, your wealth is at risk.
High-Net-Worth Investors are often encouraged to seek specialist tax advice to make sure they stay tax efficient and compliant across the jurisdictions in which they hold assets.
But of the three risks listed above, it’s inflation which is often least understood – and consequently the one which ends up posing the greatest threat to the real value of your money over time.
As inflation increases and prices rise, it doesn’t take long before the purchasing power of cash starts to dwindle.
What is cash erosion?
Cash erosion is the gradual loss of purchasing power when the return on cash fails to keep pace with inflation, tax and rising living costs. The number on a bank statement may increase, but the real value of that money can still fall if prices rise faster than the interest earned.
For High-Net-Worth Investors, the impact can be especially meaningful because larger cash balances often sit across multiple accounts, currencies and jurisdictions. Cash may feel safe because it avoids daily market volatility, but over long periods it can quietly reduce the value of wealth if it is held without a clear purpose.
That does not mean cash has no role. Liquidity is essential for short-term spending, tax payments, property purchases, business commitments and unexpected opportunities. The key question is not whether to hold cash, but how much cash is appropriate, for how long, and what the rest of the portfolio should be doing.
What could £100,000 look like in 10 years?
Assuming you held cash in a savings account with 2.5% annual interest, you would have £128,008 after 10 years, but its real value (spending power) after inflation would be £105,012.
That same £100,000, if stored as cash in a cupboard or under a mattress, would by contrast be worth just £82,035 after the same period.
Disclaimer: This example is used for illustrative purposes only: actual inflation, interest rates and outcomes will vary over time. The illustration assumes a standard fixed interest rate of 2.5% per annum, with no withdrawal of capital during the full 10-year investment period. It also assumes an average inflation rate of 2% per annum and does not consider taxes or other charges that may apply to the earnings.
That’s a meaningful difference over the long term.
When choosing where to keep your money it’s important to consider that interest rates on savings offered by your bank rarely keep up with inflation. Simply leaving money in an account may not be enough to protect its value long into the future.
Diversifying your investments can guard against this. By working with a trusted wealth manager or financial adviser, you can build a properly diversified portfolio, tailored to your unique risk appetite, investment preferences and long-term goals.
But remember no investment is risk free, and you should always consider how long you want to invest for without touching the capital.
The difference between nominal and real returns
One reason cash erosion is often underestimated is that investors tend to look at nominal returns rather than real returns. A nominal return is the headline interest rate you receive. A real return is what remains after inflation is taken into account.
For example, if a savings account pays 3% interest but inflation is 4%, the investor is still losing purchasing power in real terms. The account balance may be higher at the end of the year, but the money may buy less than it did before.
This distinction matters when assessing whether cash is truly protecting wealth. For High-Net-Worth Investors, the effect can be amplified once tax, fees and the opportunity cost of not investing are considered.
Why does cash erode value?
It’s a startling fact to any investor that one’s money should be worth less tomorrow than it is today. Inflation – the increase of the price of goods and services over time – gradually corrodes the real value of cash, as the things it buys become ever more expensive.
Banks offer savers interest on their deposits, but these rarely beat the rate of inflation over their lifetime.
High interest savings accounts, which typically ask for a minimum period of investment, or stable long-term bonds offer comparable safety and flexibility, but they may provide muted returns compared with diversified investment accounts. Some bonds offer a fixed rate of interest, and the principal amount may be protected or adjusted depending on the product. These can provide regular payments but may not keep up with rising costs.
How much cash should a High-Net-Worth Investor hold?
There is no single answer to how much cash a High-Net-Worth investor should hold. The right amount depends on lifestyle needs, planned expenditure, tax liabilities, investment horizon, family commitments, business interests and risk tolerance.
A useful starting point is to separate cash into three broad categories:
- Essential liquidity: money needed for regular spending, emergencies and near-term obligations.
- Planned liquidity: cash earmarked for known events such as tax bills, school fees, property purchases, business funding or large family commitments.
- Excess cash: money not required in the short term that may be exposed to inflation if left idle for too long.
Once cash is separated in this way, it becomes easier to decide which funds should remain liquid and which could potentially be invested for longer-term preservation and growth.
How can you guard your wealth?
One of the most important questions to ask yourself before investing is, “when do I realistically need this money back?”
For investors, it's crucial to understand current market conditions and other factors – such as interest rates, market valuations, and asset-specific risks – when choosing where to place their money.
It’s also vital to ask yourself whether you have the knowledge or the capacity to stay on top of all the market considerations that might change your preferred allocations over time.
If the answer to when you might need the total capital or a large portion of it back is “sometime next year” or “sometime in the next three years”, then the balance of risk is likely to be stacked in favour of low risk/low return assets like cash, money market products or high quality government bonds.
But if your time horizon is longer – if you are saving for the future and not for the next couple of years – your appetite for risk is likely to increase significantly. Stocks, for example, can offer higher returns over the long term, but their performance is heavily influenced by a wide range of market forces. Bonds and other fixed income financial instruments may pay regular interest, but can be negatively affected when interest rates rise, reducing their value and returns.
That’s why building a diversified basket of assets tends to be an effective way of growing value while managing risk.
Options beyond cash
Investors do not have to move directly from cash into high-risk assets. There is a wide range of options between instant-access cash and long-term equity exposure, each with different risks, time horizons and return expectations.
Depending on the investor's circumstances, these may include:
- Money market funds for short-term liquidity and potentially higher yields than standard bank deposits.
- Short-dated government bonds or high-quality fixed income for capital preservation and income potential.
- Diversified multi-asset portfolios for investors with a longer time horizon.
- Tax-efficient wrappers such as ISAs and pensions, where appropriate.
- Private markets or alternative investments for suitable investors with longer horizons and the ability to tolerate illiquidity.
The right approach should balance liquidity, risk, tax efficiency and long-term objectives. The goal is not simply to chase a higher return, but to structure wealth so that cash serves a clear purpose while longer-term capital has the opportunity to grow.
A practical cash review checklist
A regular cash review can help investors avoid holding too much unproductive capital. This is especially important after major liquidity events such as selling a business, receiving a bonus, inheriting wealth, selling property or exiting an investment.
Cash review checklist
- How much cash do you need for the next 6 to 12 months?
- Are there known tax liabilities or major expenses coming up?
- Is your cash spread across multiple providers and currencies?
- Are any balances above relevant deposit protection limits?
- What interest rate are you receiving after tax?
- Is inflation higher than the return on your cash?
- Which part of your cash balance is genuinely short term?
- Could excess cash be invested in line with your risk profile and time horizon?
- Does your current cash position support your wider wealth plan?
This type of review helps turn cash from a passive holding into an intentional part of a broader wealth strategy.
What can Cadro do for you?
Cadro crafts investment propositions that are aligned to your unique needs and goals.
Depending on your circumstances, time horizon, objectives and risk appetite, we offer ISAs, General Investment Accounts, SIPPS, Private Markets portfolios, and Family Office services which are all aimed at long-term wealth preservation and growth.
We put our clients’ long-term investment goals at the heart of everything we do – and keep them informed with engaging, clear and insightful content throughout.
Cadro was born in part from the recognition that many High and Ultra-High-Net-Worth investors were facing the choice between traditional firms with low engagement, little transparency and legacy tech, and modern robo-advisers devoid of access to personal client advisers and high-potential asset classes.
We’ve addressed this by making a tailored, hybrid service that champions both in-person advice and great technology. But to truly challenge the status quo, we also built Cadro to constantly offer greater, more far-reaching consequences for our clients’ wealth.
This includes:
Outstanding investment team
Our core focus will always be on the long-term prospects of our investment offering. We want our clients’ portfolios to be focused on long-term growth, and we meet for monthly investment committees to make sure we stay abreast of fast-changing market conditions, whatever is happening in the world.
Illuminating total wealth
We want our clients to stay engaged with their long-term goals. Whether it’s through real-time portfolio updates, in-depth video articles, or the Cadro balance sheet, we show clients where their wealth can take them, long into the future.
Private markets
Sophisticated Cadro clients with high risk tolerances can gain access to our unique blend of private markets investments, alongside their public portfolios. Those with the greatest capacity for risk therefore far expand their reach across the investible universe, all for an unprecedented inclusive fee alongside their public assets.
Value
We are cost-effective. We stay diversified and positioned for growth, but without burdening our clients with unnecessarily high fees. For access to broad public markets investments, that means making in-depth, data-led decisions on quality passive funds, and mixing them with a highly specialised blend of active opportunities that offer significant potential for enhanced returns.
If you’re interested in learning more about our service and what we could do for your wealth journey, get in touch with our client team here.
When cash still makes sense
Cash is not always a problem. It can be the right asset for short-term certainty, immediate access and planned spending. Investors may also choose to hold more cash during periods of transition, such as before a property purchase, business investment, tax payment or family event.
The risk arises when cash is held by default rather than design. A large cash balance with no defined purpose may feel prudent, but over time it can reduce purchasing power and delay progress towards long-term financial goals.
A well-structured portfolio should give cash a clear role: enough liquidity for flexibility and confidence, while ensuring longer-term wealth is not left exposed to inflation unnecessarily.
FAQs about cash erosion and wealth preservation
What is cash erosion?
Cash erosion is the loss of purchasing power that happens when inflation, tax or rising costs outpace the return earned on cash.
Is cash safe for high-net-worth investors?
Cash can be useful for short-term liquidity, but it may not protect long-term wealth if inflation is higher than the interest earned. High-Net-Worth Investors should consider how much cash they need and how much may be better allocated elsewhere.
How much cash should I keep in my portfolio?
The right amount depends on upcoming spending, tax liabilities, income needs, risk tolerance and investment horizon. Many investors benefit from separating cash needed soon from capital that can be invested for the longer term.
Can savings accounts beat inflation?
Some savings accounts may beat inflation for periods of time, but this can change as interest rates and inflation move. Investors should focus on real returns after inflation and tax, not only headline interest rates.
What can high-net-worth investors use instead of cash?
Depending on suitability and objectives, alternatives may include money market funds, short-dated bonds, diversified portfolios, tax-efficient investment accounts, pensions and private market allocations.
