Hi,
Yes, the UK/Denmark tax treaty allows the Danish tax authorities to tax your income from Danish property in Denmark. The treaty also allows the UK to tax this income as well. As a UK resident, you are taxed on your world-wide income, so you would need to convert the income and expenses for the property into pounds sterling (using a just and reasonable exchange rate) and declare gross profit, expenses and Danish tax deducted in a Self Assessment tax return.
If you are non-domiciled, you can elect to use the remittance basis of tax, where you lose your personal allowances and declare your foreign income that you are not remitting to the UK. Have a look at section 9 of RDR1 as the remittance basis does not suit everyone. The rules for the remittance basis will change on 6 April 2025.
Residence, domicile and the remittance basis: RDR1
Technical note: Changes to the taxation of non-UK domiciled individuals
All of the above will need to be declared or claimed through a Self Assessment tax return. If you are not already registered, you can register here:
Check how to register for Self Assessment
Thank you.