Royalties tax

My dad passed away in 2020 and his estate was sold to pay his debts. But I have been left his royalties and I may sell his royalty stream for an amount would I pay tax on it?

Hi
From the limited information supplied, I have assumed that these royalties are due from your late father creating literary, dramatic, musical or artistic works.  
Since you’re not the original creator of such works then the selling of the rights to the royalties of such works will be subject to capital gains tax. Intellectual Property Rights: copyright
At the time that your father passed away these works would have a market value.
If you sell the royalties for more than their market value then then capital gains tax would be chargeable.
To work out how much you would pay see :
Capital Gains Tax: what you pay it on, rates and allowances
In the meantime, any royalty income received will be chargeable under the miscellaneous income provisions and needs to be reported to us. 
Authors and literary profits: royalties to person other than author

How do I find out the market value from my late dad's royalties in 2020 as that's when my dad passed? And possibly selling his royalty stream this year. I know it could possibly be capital gains tax I would have to pay.

Hi,

Please have a look at the guidance on valuing intellectual property.

Valuing your intellectual property

You may also find advice from the valuation office at:

Contact VOA

Thank you.