NS&I Direct ISA

The NS&I Direct ISA is a cash ISA from NS&I, the government-backed savings bank. It pays a variable rate of interest, it is managed online or by phone rather than in a branch, and you can take money out whenever you like with no notice and no penalty¹. The interest is tax-free and does not count towards your Personal Savings Allowance¹.

Two features matter more than anything else on this page. First, NS&I does not currently accept transfers from other providers into the Direct ISA, so you cannot move an existing cash ISA across to it¹. Second, it is not a flexible ISA, which means every deposit you make in a tax year counts towards your ISA allowance even if you later withdraw the money¹.

The Direct ISA is one of several ways to save with NS&I, alongside Premium Bonds, Direct Saver and Income Bonds². NS&I is the UK government-owned savings bank³. Its site carries today's interest rate; this page does not.

What the NS&I Direct ISA offers

The Direct ISA is a cash ISA, which is the straightforward kind: you put money in, it earns interest, and the interest is free of UK tax⁵. NS&I describes it as a cash ISA with a variable interest rate⁶. It is not a stocks and shares ISA, so there are no investments to choose and no market risk to the capital, though the value of the interest can fall if the rate changes.

Because it is a cash ISA, it sits inside the ISA rules that apply to all cash ISAs: a set annual allowance, tax-free interest, and the requirement that you are resident in the UK for tax purposes⁷. The Direct ISA is one of the accounts NS&I lists among its holdings, alongside Individual Savings Certificates, Direct Saver accounts and Premium Bonds².

What it does not offer is flexibility. NS&I states plainly that it does not offer a flexible ISA⁵. That single fact shapes how you have to use the account, and it is covered in its own section below.

If you are weighing up whether a cash ISA suits you at all against an ordinary savings account, the trade-off is the same one that applies across the market: tax-free interest inside the ISA wrapper, against whatever rate the account pays. NS&I's own non-ISA savings accounts pay interest that is taxable, even though no tax is deducted at source⁸.

How interest is set and paid

Interest on the Direct ISA is calculated daily and added to the account once a year, on 6 April¹. That date is the start of the tax year, so the interest lands at the point the new ISA year begins. NS&I uses the same 6 April date for its Junior ISA⁵, while its Direct Saver credits interest on 1 April⁸.

The rate itself is variable and is set by HM Treasury, not by NS&I acting alone⁷. NS&I's own key document says the rate is published at nsandi.com/direct-isa or available by calling⁷. Because it is variable, the rate can change from time to time, in the same way NS&I describes for its other variable-rate accounts⁹.

Two consequences follow for a saver. The first is that the interest you earn is tax-free, so it will not count towards your Personal Savings Allowance¹. The second is that because interest is added annually rather than monthly, you do not receive a monthly income from the account; the balance simply grows once a year. If you want interest paid out monthly, that is a different kind of product, and NS&I's Income Bonds pay interest to your bank account once a month¹⁰.

Who can open a Direct ISA

The Direct ISA is open to individual UK taxpayers. Holders must be resident in the UK for tax purposes, which does not include the Channel Islands or the Isle of Man⁷. You can open an account in your own name only, so a Direct ISA cannot be held jointly¹.

That residency rule is the standard ISA rule rather than something specific to NS&I: you cannot open an ISA if you are resident abroad³. NS&I does say that customers living outside the UK may still save with it if they have a UK bank account¹¹, so if you already hold a Direct ISA and are moving overseas, it is worth asking NS&I what happens to the account rather than assuming.

If you are opening an account for someone else, NS&I accepts applications made on behalf of another person under a Power of Attorney or a Court of Protection Order¹. The mechanics matter: when applying for a Direct ISA, the donor or patient must sign the application form with the attorney, unless there is a physical or mental incapacity, in which case the deputy must sign¹². NS&I also allows attorneys and deputies to apply online or by phone once an authority has been registered with it¹².

One caution that applies to managing money for someone else generally: Which? does not recommend opening a joint bank account with someone for whom you also hold a lasting power of attorney, or its equivalents in Scotland and Northern Ireland¹³. A Direct ISA cannot be joint in any case, but the point stands for any other account you might consider alongside it.

Opening an account: applying online or by phone and proving your identity

You apply for and manage a Direct ISA online or by phone only¹. There is no branch and no postal application for this account, which is a meaningful difference from some building society cash ISAs that can be opened in branch or online¹⁴.

NS&I is required by law to check your identity and address when you apply to invest with it or register for its online and phone service, and possibly at other times to keep its records up to date¹⁶. It normally checks identity and address electronically through a credit reference agency, and asks for documents if that check does not succeed¹⁶. NS&I publishes what it might need to see¹¹.

Once you are set up, the online and phone service lets you check your NS&I investments, pay money in and take it out, change your personal details, and choose to have Premium Bonds prizes paid straight to your bank account¹⁷. NS&I also offers online forms for switching to or withdrawing money from certain accounts¹⁸.

For comparison, the routes into a cash ISA elsewhere vary widely: first direct allows applications through its app, online banking or by post¹⁹, while other providers open accounts online only²⁰. MoneyHelper's general guidance on opening an account sets out the usual channels, which include online, an app, the phone or in person depending on the account²¹. If you need adjustments because of a disability, Scope publishes guidance on managing your own money²².

Withdrawals, top-ups and managing your account

You can take money out of the Direct ISA whenever you want, with no notice period and no penalty¹. NS&I says withdrawals can take three to five days to reach your bank account¹. Its general withdrawal guidance is more precise and depends on how much you are moving and how you instruct it²³:

NS&I processes an instruction the same day if it receives it on a banking day before 20:00²³. The £50,000 threshold applies to your combined daily withdrawal total across the Direct ISA, Direct Saver, Income Bonds and Investment Account²³.

Paying in works the other way round. If you top up by bank transfer or standing order, you will see the money in your account in two to three working days¹. NS&I also offers Pay by bank account, a way to top up an NS&I account from a UK bank account you can access online; in most cases the money leaves your bank straight away and can take up to two hours to reach your NS&I account¹⁸.

Transfers: you can move out, but not in

This is the section to read before you apply. NS&I states that it does not currently accept transfers from other providers into its Direct ISA¹. If you hold a cash ISA elsewhere and want it inside the Direct ISA, that is not possible at the moment.

Moving the other way is straightforward. You can transfer your NS&I ISA balance to another provider; you contact the new provider and it arranges the transfer for you¹. Doing it as a formal transfer rather than a withdrawal matters, because a transfer between ISAs does not affect your allowance as long as the providers make the transfer and the money is not withdrawn²⁴.

There is a piece of history worth knowing here. NS&I's older Cash ISA and T Cash ISA closed on 25 May 2013, and those accounts were transferred to a Direct ISA, which can be managed online or by phone²⁵. So some existing Direct ISA holders arrived at the account through that route rather than by applying.

The transfer rules are also changing across the ISA market. From April 2027, transfers from non-cash ISAs into cash ISAs will not be permitted, while transfers from a cash ISA to a non-cash ISA remain possible¹⁵. That does not change the Direct ISA's own position, which is that it does not accept transfers in at all.

Not a flexible ISA: how withdrawals affect your allowance

The Direct ISA is not a flexible ISA, and NS&I says so directly: all your deposits within the tax year will count towards your allowance even if you withdraw them¹. NS&I does not offer a flexible ISA on any of its accounts⁵.

The contrast is worth spelling out. A flexible ISA lets you withdraw money and replace it without the replacement counting further towards your annual allowance, as long as you pay it back into the same account in the same tax year¹⁰. Providers are not obliged to offer flexible ISAs, and many do not¹⁰.

On a non-flexible ISA, every deposit counts⁵. So if you pay money into a Direct ISA in June, withdraw it in August, and pay the same amount back in October, you have used twice that amount of your allowance for that year, not once. The withdrawal does not restore the allowance.

The practical effect is that the Direct ISA suits money you intend to leave in place. If you expect to move money in and out during the year, a flexible ISA elsewhere would preserve your allowance in a way this account does not. If you do need to move an ISA balance properly, doing it as a transfer rather than a withdrawal and reinvestment keeps the allowance intact²⁴.

Government backing, security and complaints

NS&I is the UK government-owned savings bank³, and it is backed by HM Treasury, which guarantees 100% of everything invested in NS&I, with no maximum limit⁴. That is a different protection from the Financial Services Compensation Scheme. NS&I is backed by the Treasury and therefore not covered by the FSCS²⁶, while FSCS deposit protection covers deposits including cash ISAs at banks and building societies up to its own limit²⁷.

For scale, NS&I had 49,865,483 holdings as of 31 March 2026². For Premium Bonds, NS&I counts all bonds held under one holder's number as one holding².

If something goes wrong, NS&I is covered by the Financial Ombudsman Service². NS&I publishes its own complaints data and process². The FSCS publishes a guide to investment protection that explains what it does and does not cover²⁸, and Which? sets out what to do if your bank goes out of business²⁶.

On inheritance, you can inherit an additional ISA allowance if your spouse or civil partner dies, up to the value of their ISA at the date of death¹. This is the additional permitted subscription, and it can be used by the spouse or civil partner regardless of what the deceased person states in their will²⁰. ISAs can be handed to a spouse or civil partner tax-free, with an extra ISA allowance equivalent to the value of the ISA inherited¹⁴.