NS&I Junior ISA

An NS&I Junior ISA is a cash savings account for a child, run by NS&I, the UK government savings bank. Money paid in grows free of UK income tax, belongs to the child, and cannot be touched until they turn 18. NS&I states plainly that its Junior ISA is a cash ISA and that it does not offer a stocks and shares Junior ISA, so this is a savings account rather than an investment¹.

The account is opened and managed online at nsandi.com, with a minimum opening deposit of £1 paid by debit card in the account holder's own name¹. There are no fees for the Junior ISA, and NS&I does not charge to transfer money in or out³. The interest rate is variable and set by HM Treasury, so it can move up or down; NS&I's own site carries today's figure¹.

The Junior ISA limit is set by the government for each tax year and applies across every Junior ISA a child holds, no matter who pays in³. NS&I publishes the current figure in the account's summary box and on its Junior ISA page³. If a payment would take the child over the limit, NS&I refunds it in full to the paying bank account rather than keeping it¹.

What it is and who it is for

A Junior ISA is a tax-free savings account for a child under 18. The child is the beneficial owner of whatever is in it, and it stays a Junior ISA for as long as it is held by a child⁶. NS&I's version is a cash Junior ISA, which means the money sits in a savings account earning interest rather than being invested in funds or shares¹.

That makes it a different proposition from a stocks and shares Junior ISA. A cash Junior ISA is straightforward: the balance does not fall in value in cash terms, and the return is whatever interest rate applies. A stocks and shares Junior ISA can rise or fall with markets, and typically carries platform, fund and dealing charges. NS&I does not offer the stocks and shares version at all².

The account suits saving towards a long-term goal for a child, because the money is locked away until 18 by design. NS&I describes Junior ISAs as long-term savings accounts built up as a nest egg, and confirms that money cannot be withdrawn before the child turns 18, with exceptions only if the child dies or has a terminal illness¹.

Children under 16 can hold an NS&I Junior ISA, Premium Bonds or an Investment Account, so a Junior ISA is one of a small number of NS&I products open to them⁸. A child cannot hold a Child Trust Fund and a Junior ISA of any type at the same time, so a child with a Child Trust Fund has to move the whole of it across before a Junior ISA can be opened¹.

How it works

Money paid in earns interest, and NS&I calculates that interest daily and adds it to the account once a year on 6 April¹. The rate is variable and can change up or down, for example when the Bank of England base rate changes. If the rate goes down, NS&I says it will contact the account holder personally in advance to let them know¹.

Payments can be made by bank transfer or standing order from a UK bank account, or by debit card by the person who manages the account. Bank transfer funds are visible in two to three working days, and NS&I says money can take up to five working days to reach the account¹. NS&I sends an electronic statement in April each year showing deposits and interest earned¹.

A parent or guardian manages the account while the child is under 16. Once the child reaches 16, they can manage it themselves online after registering with a signed form¹. NS&I's guidance is that as soon as someone turns 16 they become responsible for their own NS&I accounts, and taking ownership is done by registering, logging in and clicking the 'Take ownership' button⁴. The next screen asks for a National Insurance number, how the young person wants to receive notifications, and confirmation that they have read the customer agreement and Junior ISA declaration⁴.

At 18 the Junior ISA ends. NS&I automatically transfers the money into an adult cash ISA from NS&I, and contacts the person who looks after the Junior ISA about a month before this happens¹. The money is not paid out to the child at that point; it moves into an adult ISA in their name, and they can then decide what to do with it.

How the fees and charges work

NS&I states that there are no fees for its Junior ISA³. There is no charge to open the account, no annual management charge, and no charge to transfer the balance in or out. That is a meaningful difference from most stocks and shares Junior ISAs, where charges are the norm.

For comparison, the shape of charges elsewhere in the market varies widely. Some investment platforms make a Junior ISA free to add on their paid plans, with customers on a cheaper plan needing to upgrade to open one¹⁰. One platform charges no service fee on its junior accounts¹¹, another charges nothing per trade on its Junior ISA¹², and a third makes Junior ISAs free for all a customer's children on its Plus plan¹³.

The practical point for a saver is that a cash Junior ISA has no ongoing charge to erode the balance, while an investment Junior ISA usually does. NS&I's own site carries the current interest rate for its Junior ISA, and the rate is variable rather than fixed¹.

Who can apply and how to apply

The child must be under 18 and live in the UK. Children under 18 who live outside the UK can only hold an NS&I Junior ISA if they are a dependant of a UK Crown servant¹. Under the ISA rules, an eligible child is one born on or after 3 January 2011, or born before that date but not eligible for a Child Trust Fund, and who is resident in the UK at the time of application¹⁴.

For a child under 16, only a parent or legal guardian can open the account. A child aged 16 or 17 can open their own¹. The legislation sets the same floor: a Junior ISA application may be made by a person over 16 who has parental responsibility for the eligible child, or by the eligible child themselves¹⁵. Anyone, not just the child and their parents, can pay into the account¹⁷.

Applications are made online only, at nsandi.com³. NS&I checks identity and address, normally electronically through a credit reference agency, and asks for documents if that check does not succeed¹⁸. The documents required depend on age: savers aged 18 and over need one document from List A for identity and one from List B for address, and the same document cannot be used for both¹⁸. Savers aged 16 or 17 need only one document, from a shorter list that includes a passport copy, a GB or Jersey photocard driving licence copy, or a birth certificate¹⁸. For a child under 16, one document is needed, such as a birth certificate or register extract, a copy of the child's passport, or a certified copy of a GP registration letter confirming an NHS number¹⁸.

Moving a Junior ISA in or out

NS&I accepts transfers in of a cash Junior ISA, a stocks and shares Junior ISA or a Child Trust Fund. The whole balance is always transferred, and NS&I says the process can take around 7 to 10 working days to complete, although the money can take up to 26 days to be transferred¹⁹. Because a child cannot hold a Child Trust Fund and a Junior ISA at the same time, the whole Child Trust Fund amount has to move across³.

To transfer an NS&I Junior ISA out, the account holder contacts the new provider, which arranges the transfer. NS&I states it will always transfer the whole amount of the Junior ISA balance¹. Partial transfers are not offered on this account.

If the money is being moved because the child has reached 18, no transfer is needed: NS&I moves the balance into an adult cash ISA automatically¹. For more on how transfers work generally, see how to transfer an ISA and how to transfer a Junior ISA.

How your money is protected

NS&I is not covered by the Financial Services Compensation Scheme. Instead it is backed by HM Treasury, which guarantees 100% of everything invested in NS&I, with no maximum limit⁵. That is a stronger arrangement than the FSCS limit that applies to banks and building societies, and it applies to all NS&I savings, not just Junior ISAs⁵.

This matters because the usual FSCS limit does not apply here, and there is no ceiling to watch. A cash Junior ISA held with a bank or building society is protected by the FSCS, but a stocks and shares Junior ISA is not protected in the same way, because investments can fall as well as rise²⁰. NS&I's guarantee is a different mechanism again, resting on government backing rather than a compensation scheme⁵.

NS&I also states that it will refund any money taken out of an account fraudulently, as long as the customer has taken reasonable care to keep the account safe, and that it monitors accounts 24/7 using technology to safeguard savings²¹. If you think you have fallen for a scam, NS&I advises contacting your bank immediately and reporting it to Action Fraud²¹.

The tax position is straightforward: the Junior ISA is free of UK income tax and does not need to be declared on a tax return³. The interest rate itself is set by HM Treasury and can change from time to time³.

Problems, complaints and getting help

If something goes wrong, the first step is NS&I's own complaints process. NS&I is covered by the Financial Ombudsman Service, so a complaint that is not resolved can be taken further²². NS&I recorded 13,609 complaints in the banking and credit cards product grouping between 1 October 2025 and 31 March 2026, closing 13,299 of them. Of those closed, 80.61% were closed within three days and 19.14% after three days but within eight weeks, with 53.45% upheld. The main cause of complaints opened was general administration, customer service or other general admin, and fewer than one complaint was opened per 1,000 holdings²².

For context on the wider market, the Financial Ombudsman Service recorded 620 complaints about cash ISAs, including cash lifetime ISAs and help to buy ISAs, in the first quarter of 2026/27²³. In the same quarter a year earlier the figure was 391²⁴, and 61 new complaints about NS&I Premium Bonds were recorded in the fourth quarter of 2025/26²⁵.

If a complaint to NS&I is not resolved to your satisfaction, you can ask the Financial Ombudsman Service to look at it. The ombudsman is free to consumers. Free, independent help with a complaint about a financial firm is also available from charities such as StepChange, which explains how to complain about a creditor²⁷.

For more on your rights, see complaining about an ISA provider and how your ISA is protected.