Letting out house - tax being deducted automatically?

[GemmaPearl97]

Recieve rental income monthly but for last few months 10% is taken for HMRC on statement, anyone know why?

No - ask your agents. I don't see why they would do this.

Do you live outside the UK?
https://www.gov.uk/guidance/paying-tax-on-rent-to-landlords-abroad

As per pp, I think you must live outside the UK. If so this is standard.

Yes i am abroad - but i pay tax abroad not in the UK? is this separate from that?

You need to do a non-resident landlord form which you can download off the government website. Provide this to your agent and they can send rental payments in full, it means you are responsible for sorting any tax yourself

If you have UK rental income it's taxable in the UK.

Anyway you need to tell HMRC about all the previous years.

I thought NRL deduction should be 20% so do query this with the agents.

You need to make sure you understand what the agents are doing, 10% doesn’t make sense, it should be 20% https://www.gov.uk/tax-uk-income-live-abroad/rent#:~:text=You%20may%20also%20need%20to,UK%20resident%20for%20tax%20purposes.