Hello and thank you for allowing me to assist you.
If this had been a common loan, any interest you received on top of your loan repayments would count as income - just as savings interest does. No interest means no income to declare.
The loan still counts as an asset - you own the debt and expect to get the money returned to you.
That means that a loan will still be included in the value of your estate for inheritance tax purposes, should you die.
You are most welcome