IHT and 'residence nil-rate band'

Does a person need to be named on the Deeds of a property to be able to take advantage of the £175K 'residence nil-rate band' for Inheritance Tax. I bought our house before meeting my current wife and so the property is currently in my name only. If she predeceases me would she have an IHT of £325K or £500K? If only £325K what would need to be done to ensure she was entitled to the 'residence nil-rate band'

Hi,

Please contact our Inheritance Tax team for advice.

Inheritance Tax: general enquiries

Thank you.