How to set up monthly savings into an investment account

A monthly investment plan is a standing instruction: you choose an amount, a date and the investments it buys, and the provider collects the money from your bank account and deals for you each month. The amounts involved are smaller than most people expect. Hargreaves Lansdown's Fund and Share Account accepts a Direct Debit from £25 per investment per month, and its funds can normally be started from £25 a month¹. Bestinvest's Stocks and Shares ISA sets its monthly savings minimum at £50³. Investment trusts can be bought from as little as £50 a month through regular savings plans⁴.

The mechanics are the same as any other direct debit. You give the provider your bank details and a collection date, and the payment repeats until you change it. What differs from a savings account is what happens next: the money buys investments, so its value moves with the markets rather than earning a fixed rate of interest. A stocks and shares ISA is one of the four ISA types, alongside cash, innovative finance and lifetime ISAs, and it is the one where the money you put in is invested on the stock markets⁵.

This page covers what a regular plan is, where to hold it, how to set one up, what monthly buying does and does not achieve, how to change or stop it, and where protection applies. It does not recommend a provider or a fund.

What a regular investment plan is and how monthly saving works

A regular investment plan is an instruction to invest a fixed amount each month into the investments you have selected¹⁰. It sits inside an account, and the account type decides the tax treatment rather than the payment method. The Individual Savings Account Regulations 1998 set up the framework: they provide for accounts to be opened by account managers, into which an individual makes subscriptions, and through which those subscriptions are invested¹¹.

The pattern is familiar from ordinary saving. A regular savings account is one where you deposit money monthly, and some accounts place conditions on how much you pay in and how often you withdraw¹². Some require a deposit every month under the account terms¹³. Regular saving suits people who want to save every month, will not need the money often, can commit to the account's minimum, and are saving towards a goal over a long period¹⁴.

The difference is the destination of the money. In a savings account it sits as cash. In an investment account it buys funds, shares, investment trusts or exchange-traded funds, and the value can fall as well as rise. That is why the account type matters more than the payment method: the same £50 a month behaves very differently in a cash ISA and a stocks and shares ISA.

Choosing where to hold it: stocks and shares ISA, general account or pension

Three wrappers cover most monthly investing, and they differ in tax treatment, access and what they are for.

A stocks and shares ISA is a tax-efficient way of investing, with an annual allowance¹⁵. The allowance is £20,000 each tax year, and money paid in does not attract tax on interest or investment growth⁶. An ISA can be set up as a stocks and shares account, a cash account, an innovative finance account or a Lifetime ISA¹⁶. A Lifetime ISA can hold cash or stocks and shares¹⁷.

A general investment account holds the same investments without the ISA's tax shelter. Some providers offer one alongside a workplace pension, and HSBC's app, for example, requires either a stocks and shares ISA or a general investment account before you can invest¹⁸. Charles Stanley's online investing service offers ISAs, self-invested personal pensions and a general investment account²⁰.

A pension is the third option, and the least accessible. With a personal pension you pay regular monthly amounts or a lump sum to a provider who invests it on your behalf²¹. Money going in attracts tax relief, but it is locked until pension age apart from limited circumstances. Royal London's investment options let you choose a ready-made portfolio or select from the full list of investments²².

The choice turns on when you need the money and what you are saving for, not on which wrapper is intrinsically better. Money you may need in a few years sits awkwardly in a pension, and money you will not touch until retirement uses less of its potential in a general account.

Setting up a monthly direct debit, step by step

The process is short, and most of it happens online.

1. Open the account. For an ISA, the application goes to the account manager as a statement with a declaration, giving your full name, permanent address including postcode, national insurance number or confirmation you do not have one, and date of birth⁸.
2. Choose the investments. A monthly instruction names what it buys. Hargreaves Lansdown's Direct Debit monthly investing covers FTSE 350 shares, certain investment trusts, some ETFs and funds¹. Index funds can be held in a stocks and shares ISA, Lifetime ISA, self-invested personal pension or a Fund and Share Account²³.
3. Set the amount and the date. Direct Debits can be set up from as little as £25 per investment per month at Hargreaves Lansdown, and the Fund and Share Account accepts a Direct Debit from £25 per month¹. Interactive Investor lets you fund an account by a one-off payment or a monthly direct debit²⁴.
4. Give your bank details. The provider collects from your current account. A basic bank account is enough: these accounts let you set up direct debits and standing orders, use a debit card, receive income and check your balance²⁵.
5. Check the first collection. The first payment confirms the instruction is live, and the provider then deals on the agreed schedule.

Some providers also accept a standing order rather than a direct debit, which you set up with your own bank to move money automatically each month²⁶. The practical difference is who controls the collection: a direct debit is claimed by the provider, a standing order is sent by your bank.

Pound-cost averaging: what it does and what it does not do

Investing the same amount each month means you buy more units when prices are low and fewer when they are high. That is the whole of the effect, and it is worth being precise about what follows from it.

What it does: it removes the need to time a single purchase, and it turns a large decision into a series of small ones. It also matches how most people are paid, which is why the minimums are set low. Investment trusts can be bought from as little as £50 a month⁴, and funds generally can be started from around £50 a month²⁸. Hargreaves Lansdown's own example of a monthly account charge is £1.46 per month on £5,000 invested in a fund receiving an average discount, as at 30 June 2024²⁹.

What it does not do: it does not protect you from loss. If the investment falls over the whole period, buying monthly simply means you bought a falling asset in instalments. It does not guarantee a profit, and it does not make a risky investment suitable. The risk and reward relationship is unchanged by how you pay²⁸.

It also does not remove charges. Platform and fund charges apply to whatever you hold, and they are deducted whether the investment rises or falls. On small monthly amounts, a fixed monthly platform charge takes a larger share of the pot than it would on a large lump sum, which is why the charge structure matters as much as the investment choice.

Changing, pausing or stopping your monthly payments

A regular plan is not a commitment for a fixed term. You can change the amount, change the investments, pause the collection or stop it, and the provider's own terms set how.

Changing the investments is straightforward. A monthly instruction names what it buys, so you can redirect future payments, and you can switch the holdings you already have. Switching inside an ISA or pension is not a withdrawal, so it does not use allowance. If you hold the same investment in more than one account type, each account needs its own instruction: holdings of the same stock are grouped separately within a stocks and shares ISA, Junior ISA and Lifetime ISA, within self-invested personal pensions and drawdown, and within a Fund and Share Account³⁰.

Pausing is a matter of telling the provider to stop collecting. The facts here do not set out a penalty for pausing a regular investment plan. The account's own terms are what matter: some regular savings accounts require a monthly deposit, and missing one can affect the terms you signed up to¹³.

Stopping altogether is different from closing the account. Stopping the direct debit leaves the investments in place; closing the account means selling or transferring them. If you are moving an ISA, arrange the transfer through the new provider rather than withdrawing the money, because a withdrawal and re-subscription uses allowance.

Where your money is protected and where it is not

Protection depends on what failed, not on how you paid.

If the firm holding your investments fails, the Financial Services Compensation Scheme covers investments, but it does not cover poor performance: an investment that falls in value is not a claim⁹. Many investment platforms also hold your money in separate client money accounts, usually with UK banks, before it is invested⁹.

If the investment itself fails or is suspended, the picture is different. A fund can be suspended so you cannot sell, and the compensation scheme does not step in simply because a fund performed badly. Where a regulated adviser recommended an unsuitable investment, a claim may be possible even if the investment itself was unregulated⁹.

Advice is a separate question. Regulated advice from an authorised firm can be complained about to the Financial Ombudsman Service, which handles complaints about individual savings accounts and ISAs⁵. Advice from an AI tool is not covered: the FCA has warned that AI-generated financial information falls outside its regulation and outside the protection schemes, so a loss following an AI tool's suggestion is not something the ombudsman or the compensation scheme would normally cover.

Where the rules differ across the UK, the ISA framework applies throughout, and the compensation limits are set on the same basis. Free, impartial guidance is available from MoneyHelper, and free debt advice from charities including StepChange and National Debtline if monthly payments are competing with problem debt.