It is an uncomfortable fact that around half of marriages end in divorce. But separation does not cancel out a shared responsibility, or a shared ambition, to give a child the strongest possible start in life.

For co-parents, saving and investing for a child can raise practical questions, particularly when it comes to Junior ISAs. Who can open the account? Who can manage it? And whether co-parents can both have access.

The rules are clearer than many expect.

What is a Junior ISA

A Junior ISA is a long-term, tax-free savings or investment account for children under the age of 18. The account belongs to the child, not the parent. Money cannot be withdrawn until the child turns 18, at which point the Junior ISA automatically converts into an adult ISA. A Junior ISA can be a Cash ISA (similar to a long-term savings account) or, like the ISAs here at the Children’s ISA, is based on Investments.

Who can open and manage a Junior ISA

Only a parent or legal guardian with parental responsibility can open a Junior ISA and act as the registered contact.

In practice, this means:

• Only one person is registered as the account manager
  
• That person controls the account settings and online or app access
  
• The money always belongs to the child
  

Most providers do not allow two registered contacts on the same Junior ISA. Even where both parents share parental responsibility, one must be named as the primary manager.

Junior ISA rules for co-parents explained

For co-parents, the distinction between contributing and controlling a Junior ISA matters.

Key Rules at a glance

Role	Can open an account	Can manage account	Can contribute	Can withdraw before 18
Parent or guardian (registered contact)	Yes	Yes	Yes	No
Co-parent (not registered)	No	No	Yes	No
Grandparents and family	No	No	Yes	No

Can both co-parents contribute to a Junior ISA?

Yes. Both co-parents can contribute to the same Junior ISA, even if only one is registered as the account manager.

So can grandparents, relatives and friends or either co-parent.

The only limit is the annual Junior ISA allowance, which applies to the total amount paid in, regardless of who contributes.

Can both co-parents access the Junior ISA account online?

Usually, no.

Junior ISA providers typically allow online access to one parent. Contributing money does not grant visibility or management rights. A co-parent who is not registered will not usually be able to view balances, change investments or access the account digitally.

What if co-parents want to change who manages the account

It is possible to change the registered contact, but this depends on the provider.

Many Junior ISA providers allow the account to be transferred so that another parent or guardian becomes the registered manager. This usually requires agreement, proof of parental responsibility and completion of provider-specific forms.

What happens when the child turns 16 or 18

At 16, the child can choose to take over management of the Junior ISA, including investment decisions.

At 18, the Junior ISA becomes an adult ISA automatically. The child gains full control and can withdraw funds if they choose.

At that point, parental access ends entirely.

Junior ISA rules for co-parents: FAQs

Can both co-parents manage a Junior ISA?

No. Only one parent or guardian can be the registered contact at a time.

Can co-parents both pay into the account?

Yes. Contributions are open to both parents and others, within the annual allowance.

Does paying in give access to the app?

No. App and online access are usually limited to the registered contact.

Can the registered parent be changed?

Yes, depending on the provider, usually via a transfer process.

Does divorce affect the child’s Junior ISA?

No. The account belongs to the child and remains unaffected by changes in parental relationships.

The bottom line for co-parents

Junior ISA rules are designed around stability and the child’s long-term interests. While only one parent can manage the account at any given time, both co-parents can contribute towards their child’s future.

Separation changes family structures, not parental responsibility. Or the desire for either parent to provide the best outcome for their children.