How to set up dividend reinvestment

Dividends are the income that some shares and funds pay out. Rather than take that money as cash, you can arrange for it to buy more of the same investment. On a platform this is usually called a dividend reinvestment service, and it is switched on per account and per holding. Some funds do the same job internally through accumulation units, which reinvest the income the fund generates rather than paying it out¹.

The mechanics are simple. A company pays a dividend, the platform uses the cash to buy more shares in that same company, and you end up owning slightly more of it. Over time the extra shares pay their own dividends, which buy more shares again. The Association of Investment Companies notes that dividends can be reinvested in further shares, which can significantly enhance returns over the long term³. The dividends themselves are not guaranteed: the AIC also points out that the dividends paid by investment trusts and other companies can fluctuate⁴.

What it costs depends on how you do it. AJ Bell charges £1.50 for each reinvested dividend in its dealing account, Lifetime ISA and SIPP, and the dividend must be £10 or more and enough to buy at least one share⁶. Interactive investor charges 99p per reinvestment⁹. Buying accumulation units instead avoids a separate dealing charge, because the fund reinvests internally².

What dividend reinvestment does with your payouts

When you hold shares directly, the company decides whether to pay a dividend at all. Companies may pay dividends to shareholders or may prefer to reinvest profits for further growth¹. If a dividend is paid, you normally choose between taking it as cash or reinvesting it to buy more shares¹. Index funds typically pay dividends if the underlying companies they invest in pay them, so the same choice reaches tracker investors¹³.

Reinvestment compounds. Each dividend buys more shares, those shares pay their own dividends, and the pot grows on both the money invested and the returns already earned⁴. That is why performance figures for investment trusts are almost always given on a total return basis, where any dividends received are considered to have been reinvested¹⁴. A quoted return that ignores reinvestment understates what a long-term holder actually got.

The trade-off is that reinvested money is not available to spend. If you rely on the income, taking it as cash is the point. If you do not, leaving it in cash means it earns nothing until you decide what to do with it. The dividends themselves can also fall or stop: the AIC is explicit that dividends paid by investment trusts and other companies can fluctuate⁴.

Accumulation funds or reinvesting income shares

There are two routes to the same place, and they behave differently.

Accumulation units or shares reinvest the income the fund generates, while income units pay it out². The dividends are automatically reinvested, so returns are earned on the money invested as well as on the returns themselves⁴. Because the fund handles it internally, there is no separate dealing charge and no minimum dividend to clear. AJ Bell's own guidance states that an investor looking to reinvest income received from a fund should consider purchasing the accumulation units in the fund⁶.

A platform reinvestment service works on holdings that pay out. You keep income shares or the individual shares themselves, and the platform uses each dividend to buy more. This suits shares, investment trusts and ETFs, which do not come in an accumulation class. It costs a fee per reinvestment on most platforms and usually needs the dividend to be large enough to buy at least one whole share.

Funds are open-ended investments that can issue or redeem units at any time to satisfy investors who want to buy into them or sell out¹⁵. That matters for accumulation units: the reinvested income buys new units inside the fund rather than in the market, so there is no separate dealing event for you to pay for.

ETFs come in both forms: distributing ETFs pay dividends out to investors as cash, while accumulating ETFs automatically reinvest dividends back into the fund¹⁶.

Costs of reinvesting dividends

The charge is per reinvestment, not per pound, so it falls hardest on small dividends. AJ Bell charges £1.50 for each reinvested dividend⁶, a figure that appears in its dealing account charges, its Lifetime ISA charges and its SIPP charges⁸. Interactive investor charges 99p per reinvestment⁹.

That difference matters at the small end. A £10 dividend reinvested at £1.50 costs 15 per cent of the dividend before any market movement. The same £10 reinvested at 99p costs just under 10 per cent. Neither is a reason to avoid reinvestment on a large holding, but on a small one the arithmetic can favour leaving the cash until it builds up, or holding the fund in an accumulation class instead.

There is a second condition that catches small payouts. AJ Bell requires the dividend to be £10 or more and sufficient to buy at least one share in the company for the reinvestment to take place⁷. A dividend that clears £10 but cannot buy a whole share does not get reinvested. Interactive investor's service is described as automatically reinvesting dividend payments for 99p¹⁰, without a stated minimum in the material reviewed here.

Platforms also charge for the account itself, separately from reinvestment. Those fees are set out in platform fees and charges and dealing charges.

Setting up dividend reinvestment with AJ Bell

AJ Bell lets you leave your dividends in cash or reinvest them automatically using its dividend reinvestment service¹⁸. You can set up dividend reinvestment so that dividend payments are automatically reinvested into that stock¹⁹.

Three practical points govern how it works:

• It is switched on per account. For each account you hold, you need to turn on dividend reinvestment separately⁶. An ISA and a dealing account are configured one at a time.
• It is switched on per holding. You can change the investments included in the service by configuring the tick boxes within your account, or the dividend reinvestment buttons on your Portfolio page⁸.
• Eligible dividends are those paid by UK listed ordinary shares, investment trusts and ETFs traded in British pounds⁷.

Special dividends are included within the service⁸. Where the service is activated, they are reinvested two working days after the dividend is paid into your account⁸. If you do not want a particular special dividend reinvested, the investment has to be removed from the service before the dividend is paid⁸.

Tax on reinvested dividends

Reinvesting does not shelter a dividend from tax. The tax charge applies on all investments that produce dividends, even where they are reinvested rather than paid to you¹¹. The money is treated as received and then used to buy shares, so the same rules apply as if it had landed in your account as cash.

Rates are changing. Tax on dividend income will increase by 2 percentage points²⁰, and the Budget set out increasing tax on dividend income by two percentage points at the ordinary and upper rate from April 2026²¹. The dividend upper rate for dividends otherwise taxable at the higher rate was 33.75 per cent²², and the Income Tax Act 2007 sets the dividend upper rate at 35.75 per cent for the tax year 2026-27 and subsequent tax years²³. Where a figure has moved between documents, both are given here.

Scotland is not different on this point. You pay the same tax as the rest of the UK on dividends and savings interest²⁴. There are also no National Insurance contributions payable on dividends²⁵.

If your dividends are between £500 and £10,000, you can ask HMRC to change your tax code so the tax comes from your salary or pension, or add the dividend income to your self-assessment return if you already fill one in²⁶.

Where dividend reinvestment does not apply

Several situations stop reinvestment or change what it means.

Suspended funds. It is not possible to buy shares in a suspended fund, so dividends cannot be reinvested. If you have asked for dividends from a suspended fund to be reinvested, the payments will stay in your account as cash²⁹. This applies to ISAs, investment accounts and pensions²⁹.

Dividends too small to buy a share. At AJ Bell the dividend must be £10 or more and sufficient to buy at least one share⁷. Below that, the cash sits in the account.

Special dividends you want in cash. Special dividends are included in the service, so the investment has to be removed before the dividend is paid if you want to keep that one as cash⁸. The AIC also notes that the dividend yields it publishes do not include any special dividends paid³⁰.

REITs. Shareholders in real estate investment trusts pay income tax, as opposed to dividend tax, on the distributions made to them, and no tax is paid on distributions if the holding is in an ISA or SIPP³¹. The label on the tax charge is different, so the treatment is not identical to an ordinary dividend.

Non-UK investments. Non-UK investments may be subject to dividend taxes applied by the country with tax jurisdiction over the investment¹¹.

Where the money is held. Reinvested dividends do not count as ISA contributions¹², so reinvestment inside an ISA does not use up your annual allowance. Platforms commonly let you hold investments inside an ISA, SIPP or Junior ISA³³. Moving an existing holding into a tax wrapper is a separate step, sometimes called bed and Isa, which means selling an asset in a general investment account and repurchasing the same asset straight away in an ISA, Junior ISA or SIPP²⁵.

One general warning worth stating plainly: investment is not suitable as a way to get out of debt³⁴.