Hi sw2048,
If your property income is more than £1000, you can choose to calculate your profits on the usual basis which is your gross income less expenses, or
you can elect to deduct the £1000 property allowance from your gross property income.
If you do choose this option, you cannot deduct any expenses.
You can get more information on our website on Trade and Property Income Allowance:
Tax-free allowances on property and trading income
You would use the net income for your adjusted net income.
Thank you.