Registration of self assessment for rental income

I'm a non uk resident and i previously purchased a property in UK. I'm in the process of completing the self assessment form. I recently applied for the national insurance number and the paper form of SA100 few days ago so i think i could not complete the tax return before 31 Oct (i.e. tax filing deadline). I also tried to call a few times the self-assessment enquiry hotline of HMRC +44 1619319070 but unsuccessfully. I was wondering if there's another way to apply for an extension of the tax filing?

Hi Christina Chu,

No. if the return is late you can appeal against any penalty.
You could also file online using 3rd party software to show the rental income and residence status - Self Assessment commercial software suppliers

Thank you.