{"id":448053,"date":"2026-02-27T06:53:28","date_gmt":"2026-02-27T06:53:28","guid":{"rendered":"https:\/\/www.newsbeep.com\/uk\/448053\/"},"modified":"2026-02-27T06:53:28","modified_gmt":"2026-02-27T06:53:28","slug":"how-much-cash-should-you-really-keep-in-your-stocks-and-shares-isa-or-self-invested-personal-pension","status":"publish","type":"post","link":"https:\/\/www.newsbeep.com\/uk\/448053\/","title":{"rendered":"How much cash should you really keep in your stocks and shares ISA or self invested personal pension?"},"content":{"rendered":"

With markets swinging between rallies and setbacks – and savings<\/a> rates still looking relatively attractive <\/a>– many investors are holding more cash<\/a> than they used to.<\/p>\n

But this isn\u2019t about money<\/a> in a high-street savings account.<\/p>\n

It\u2019s about the cash sitting inside your ISA, personal pension (SIPP) or general investment account – money that hasn\u2019t yet been invested and may have built up after selling funds, receiving dividends or waiting for a \u201cbetter time\u201d to invest.<\/p>\n

In most DIY investment accounts, how much cash you hold is entirely your decision.<\/p>\n

And holding too much, for too long, can quietly reduce the growth your money could otherwise achieve.<\/p>\n

When cash makes sense<\/p>\n

Cash has a clear role in any financial plan. \u201cKeep enough cash for emergencies – three to six months is recommended,\u201d says James Norton, head of retirement and investments<\/a> at Vanguard. \u201cIf you have a short-term goal, for example if you\u2019re about to buy a house and you need absolute certainty, cash makes sense.\u201d That cash shouldn\u2019t be in your investment account of course – easy access is key here<\/a>. <\/p>\n

Timescale is crucial too. \u201cWhere money is likely to be used within the next three years, or forms part of a rainy-day reserve, holding cash in a competitive interest-bearing account is sensible,\u201d adds Matt Lewis, chartered financial planner at EQ Investors.<\/p>\n

But beyond short-term needs, cash inside a long-term investment portfolio should generally be modest. \u201cProvided funds are invested with a medium or long-term objective, cash held within an investment portfolio can reasonably be low, often around the two per cent mark,\u201d Lewis says.<\/p>\n

Instead, he suggests keeping an appropriate personal cash reserve outside your investment account to provide the \u201csleep-at-night factor\u201d that allows the rest of your money to stay invested and focused on longer-term growth.<\/p>\n

The cost of sitting on cash<\/p>\n

Holding some cash for flexibility is sensible, but holding large amounts for years can be costly. \u201cCash saving has historically generated lower returns than investing<\/a> and often struggles to keep pace with inflation,\u201d Norton says. <\/p>\n

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open image in gallery<\/p>\n

(Getty Images)<\/p>\n

\u201cIf you invested \u00a310,000 in global stocks 20 years ago you would have a portfolio worth \u00a382,500 today, accounting for inflation. Whereas if you had left that \u00a310,000 in cash, inflation would have worn that pot down to being worth just \u00a34,100.\u201d<\/p>\n

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Lewis warns that the impact becomes noticeable once cash goes beyond what you genuinely need for security.<\/p>\n

\u201cCash begins to create a drag on returns once it exceeds an investor\u2019s required safety buffer,\u201d he says, adding that leaving money uninvested for long periods can mean missing out on potential growth compared with staying fully invested.<\/p>\n

Timing the market is risky<\/p>\n

With markets periodically hitting record highs, it\u2019s natural to hesitate.<\/p>\n

\u201cYou may feel uneasy investing when markets are rallying or at all-time highs. But history shows markets usually go on to reach new highs,\u201d Norton says.<\/p>\n

Trying to jump in and out of cash based on headlines rarely works. \u201cStay invested over the long term and don\u2019t try to time when to move in and out of cash,\u201d he adds.<\/p>\n

For goals more than five years away, Lewis says investors are usually better off letting their investments grow over time, rather than holding large cash balances that can limit overall returns.<\/p>\n

Not all platforms treat cash equally<\/p>\n

One wrinkle many investors overlook is how their platform handles uninvested cash.<\/p>\n

Some investment platforms – including AJ Bell, Freetrade, Hargreaves Lansdown, Lightyear, Trading 212<\/a>, Vanguard and XTB – pay interest on cash balances held within ISAs<\/a> and SIPPs.<\/p>\n

However, policies vary. Some providers pass on most of the interest they receive from partner banks; others keep a portion. Rates may be tiered, capped or require investors to switch on a specific feature. By contrast, some platforms pay little or no interest at all on default cash balances.<\/p>\n

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open image in gallery<\/p>\n

(Getty Images)<\/p>\n

\u201cFirst confirm whether your platform pays interest on uninvested cash, and at what rate and under what conditions,\u201d Lewis says. \u201cCharges and taxation can materially reduce the effective return received.\u201d<\/p>\n

On five-figure balances, the difference can amount to hundreds of pounds a year.<\/p>\n

What about tax?<\/p>\n

Interest earned within ISAs and SIPPs is tax-free.<\/p>\n

But cash held in a taxable general investment account counts towards your personal savings allowance – \u00a31,000 for basic-rate taxpayers and \u00a3500 for higher-rate taxpayers – above which interest becomes taxable.<\/p>\n

\u201cInterest earned on cash is taxed as income,\u201d Lewis says, and it counts towards the total interest you earn across all your savings accounts.<\/p>\n

All this makes deciding the \u201cright\u201d amount of cash specific to your situation and goals.<\/p>\n

For long-term investors with stable income, only a small working balance may be necessary. Those closer to retirement, or planning to draw money soon, may sensibly hold more.<\/p>\n

Cash can steady a portfolio. But left unchecked, it can also slow it down. The key is making sure it is there for a clear purpose – not simply because markets feel uncomfortable.<\/p>\n

When investing, your capital is at risk and you may get back less than invested. Past performance doesn\u2019t guarantee future results.<\/p>\n","protected":false},"excerpt":{"rendered":"With markets swinging between rallies and setbacks – and savings rates still looking relatively attractive – many investors…\n","protected":false},"author":2,"featured_media":448054,"comment_status":"","ping_status":"","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[84,4176,4174,4175,56,54,55],"class_list":["post-448053","post","type-post","status-publish","format-standard","has-post-thumbnail","category-personal-finance","tag-business","tag-finance","tag-personal-finance","tag-personalfinance","tag-uk","tag-united-kingdom","tag-unitedkingdom"],"_links":{"self":[{"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/posts\/448053","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/users\/2"}],"replies":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/comments?post=448053"}],"version-history":[{"count":0,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/posts\/448053\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/media\/448054"}],"wp:attachment":[{"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/media?parent=448053"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/categories?post=448053"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.newsbeep.com\/uk\/wp-json\/wp\/v2\/tags?post=448053"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}