If Your Spouse Loses Capacity

04th May 2026

When people search for If Your Spouse Loses Capacity, it’s rarely theoretical.

It often follows a moment in time, some kind of diagnosis, perhaps a hospital visit. Or just a growing sense that something isn’t quite right anymore.

At that point, the question becomes very practical. Who can actually make decisions if your spouse can’t?

Understanding mental capacity

In UK law, mental capacity means being able to understand, retain and weigh up information, then communicate it as a decision.

If someone can’t do that for a decision, they may lack capacity for that particular situation.

This is all set out under the Mental Capacity Act 2005, which provides the framework for how decisions are made on behalf of others.

Capacity can, of course, change over time. Someone might manage everyday choices pretty well, but struggle with more complex financial or medical decisions.

That’s a clear situation where things can become unclear for families.

Being a spouse doesn’t give automatic authority

This part surprises most people.

Even if you’re married, you don’t automatically have the legal right to make decisions on your spouse’s behalf.

Banks, healthcare providers and other organisations need formal authority before they will share information or allow you to act for your loved one.

Without that formal authority in place, you may find yourself unable to access accounts, manage finances or make key decisions, probably when they’re needed most.

When a Lasting Power of Attorney is in place

If your spouse has set up an LPA, using a service like Power of Attorney Online, while they still had capacity to do so, things are much more straightforward.

They’ll have appointed you as their attorney, giving you the legal authority to make decisions if they lose capacity at some point in the future.

Once the LPA is fully registered with the Office of the Public Guardian, you can act within the scope of that document.

There are two types of LPA to consider:

• Property and financial affairs, covering money, bills and assets
• Health and welfare, covering care, treatment and living arrangements

Most people choose to set up both at the same time.

What if there is no LPA in place

This is where the process can become more complex.

If your spouse has already lost capacity and no LPA exists, you can’t create one on their behalf after the event.

Instead, you may need to apply to the Court of Protection to become a deputy.

This allows you to make decisions for them, but it involves a formal application to the Court, ongoing supervision and typically takes longer to put in place.

It’s a route forward, but not a quick or cheap one.

Making decisions in someone’s best interests

Whether you’re an attorney using an LPA or acting as a deputy, decisions must always be made in your spouse’s best interests.

That includes considering their past wishes, values and preferences.

It’s not about taking control. It’s about stepping in where needed, while still respecting who the person is at heart.

Planning ahead makes a real difference

Most people only come across this situation when they’re already in the thick of it.

By then, your options are naturally more limited.

If your spouse still has capacity, putting an LPA in place now keeps things simple later by allowing decisions to be made by someone they trust, without added barriers or delays when you probably need them least.

And if you’re already navigating this without one, at least understanding the legal position helps you move forward with more clarity.

It’s not an easy situation, either way, but having the right structure in place can make it far more manageable when it matters most.