Hello and welcome to the site. Thank you for your question.You say the BTL property is now giving you a profit after allowable expenses. Most common reasons for needing to fill in a tax return include income from property of - £10,000 or more before deducting allowable expenses or- £2,500 or more after deducting allowable expenses.As your wife does not pay tax through a PAYE code she will need to complete a tax return if all of the following apply:- she has income to declare, for example income from savings, trusts or abroad, rental income from land or property- her total income exceeds her total allowances and reliefs- she has tax to pay on this income.Based on information provided she does not meet all requirements and therefore she does not have to complete a tax return. More information on this can be found here - look at
- Who needs to complete a tax return
- If you don't think you need a tax return
I hope this is helpful and answers your question.