Too much cash can hurt your retirement plan. Too little cash can leave you short if markets fall. The right answer is usually somewhere in the middle.
A simple starting point is to keep up to three years of your unsecured spending in cash or short-term bonds. But the right amount is personal. Think about how much risk you are comfortable with, how much you can change your spending, and how steady your income is. The goal is to have a cash reserve that fits your needs and helps your retirement plan work. You can keep this money in your investment portfolio, in savings accounts, in Cash ISAs, or split it between them.
What is unsecured spending?
Unsecured spending is the money you need each year that is not already covered by secure or guaranteed income. Secure income might include:
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State Pension income.
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Defined benefit pension income.
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Annuity income.
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Rental income, where it is reliable.
For example, suppose you spend £40,000 each year in retirement. You receive £24,000 from State Pensions and defined benefit pensions. This leaves £16,000 of unsecured spending. Three years of unsecured spending would be £48,000.
This is different from holding three years ‘ worth of all your spending, which would be £120,000. This difference is important. Your cash reserve only needs to cover what your secure income does not.
Why hold three years of spending?
The main reason is to avoid having to sell investments after the market falls. When you are still working and markets fall, you can usually continue investing and wait for them to recover. Retirement is different. You may need to withdraw money every month, regardless of what markets are doing. If shares fall and you keep selling them to pay for your spending, you make a temporary loss permanent. You also end up with fewer investments left to grow when markets recover.
This is known as sequencing risk. A cash and short-term bond reserve gives you money to spend when markets are down. Instead of selling shares after they have dropped, you can use this safer part of your plan. This gives your investments time to bounce back. Cash feels safe because its value does not usually change much.
But cash is not risk-free. The biggest risk is inflation. If your cash earns 3% but prices rise by 4%, your money loses about 1% of its value each year. Over a long retirement, this can make a big difference. Retirement can last 25, 30, or even 40 years. If you keep too much in cash, your money might not keep up with rising prices. Cash is good for short-term needs. It is not usually the best choice for long-term growth in retirement.
Why not stay fully invested?
If you keep all your money invested, you might get higher returns over time. But you also take on more short-term risk. Markets do not provide smooth returns. Your investments might do well on average over 20 years. But there can still be big drops along the way. When you are taking money out, the timing of those drops matters. A big fall in the market early in retirement can do more harm to your plan than a fall later on.
Having a cash reserve means you do not have to sell investments when markets are down.
Why use short-term bonds?
You do not necessarily need to hold the full reserve in bank accounts. Part of it can be held in short-term bonds or money market investments. These investments can move up and down more than cash, but much less than shares or long-term bonds. They might also pay more than cash over time, but this is not guaranteed.
A simple structure could include: Around one year of withdrawals in cash. A further two years in short-term bonds or money market funds.
How you split your reserve depends on interest rates, tax, charges, and how quickly you need the money. For cash, you can use high-interest savings accounts, easy access Cash ISAs, or premium bonds. For short-term bonds, you might look at UK government gilts under three years, short-term bond funds, or money market funds. Pick options that are low-cost, safe, and easy to access.
Should the cash sit inside or outside your pension?
Either can work.
Keeping cash outside your pension can make it easier to take money out. Savings accounts and Cash ISAs are easy to use and may help you avoid extra charges. Keeping cash inside your pension can make managing your investments simpler. You can take withdrawals straight from the pension without selling other investments first. Some people keep part of their reserve outside their portfolio for spending and emergencies, and the rest inside their pension or investment account.
Where you keep your reserve matters less than having a clear plan for how you will use and refill it. A common way is to top up your cash or short-term bonds after your investments have grown. Some people check and refill their reserve once or twice a year. This helps make sure you have money when you need it and do not have to sell investments when markets are down.
How should the reserve be managed?
Your reserve does not need to stay the same forever. It can change as your needs change. When markets have done well, you can sell some investments and top up your cash or short-term bonds. When markets are down, you can use your reserve and wait before selling shares.
This is not about trying to guess what markets will do. It is a simple, disciplined way to manage withdrawals. You use good market periods to refill your cash and bonds. That way, you have them ready for tougher times.
What else affects the amount you should hold?
Three years is a useful starting point, but it is not suitable for everyone. You may need more if:
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You are uncomfortable with investment volatility.
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Most of your spending depends on portfolio withdrawals.
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You have a limited ability to reduce your expenditure.
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You expect major costs during the early years of retirement.
You may need less if:
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Most of your spending is covered by secure income.
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You have flexible expenditure.
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You have significant cash held elsewhere.
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You are comfortable with investment risk.
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You have other assets or sources of income available.
Your reserve should match your real financial plan. It should not just be an arbitrary percentage of your portfolio.
An example
Consider a couple who spend £50,000 each year. They receive £30,000 from State Pensions and defined benefit pensions. Their unsecured spending is £20,000. A three-year reserve would therefore be around £60,000.
They might hold £20,000 in cash and £40,000 in short-term bonds. The rest of their pension and investments can then be left to grow for the long term. If markets fall, they can use the £60,000 reserve rather than immediately selling growth assets. If markets do well, they can refill the reserve.
The purpose of cash in retirement
The aim is not to avoid all investment risk. Trying to avoid all risk usually means holding too much cash and accepting the long-term damage from inflation. The aim is to keep enough cash and short-term assets to cover your withdrawals and avoid having to sell investments when markets are down.
For many clients, about 1-3 years of unsecured spending strikes a reasonable balance. This gives you short-term stability while letting the rest of your portfolio stay invested for long-term growth and future withdrawals. The right amount depends on your income, spending, investments, tax, and how you feel about risk. Check your cash reserves at least once a year, or whenever your finances or life changes significantly. This helps ensure your plan stays on track and provides the right level of security in retirement.
