Hi,
You would not be able to claim any expenses in respect of the accountancy fees incurred in the preparation/ completion of your tax return in respect of your rental income as this expense would not be deemed as being wholly and exclusively in respect of the rental property.
The tax return will be completed to reflect the overall amount of your income from all sources.
Please refer to the following guidance:
PIM2010
In respect the use of Simplified expenses we would advise you that this type of expenses are a way of calculating business expenses using flat rates instead of working out the actual business costs incurred.
This would usual apply to Self Employment income.
In respect of proprerty rental income then you would calculate your allowable expenses using the figure of actual expenses incurred.
Thankyou