Do I need to do a self-assessment return?

The guidance says that if you receive over £10,000 from savings you must register for a self-assessment form - does interest from ISAs count towards the £10,000? Eg if you received £11,000 interest consisting of £10,000 from ISAs and £1,000 from other savings would you need to do a self-assessment return? If so what is the reasoning behind this, since no tax would be payable?

Hi Steve,
No ISA interest does not count for this as ISA is tax free. It is a legislative decision for the £10k limit but not all it may be tax free as you still need to take into account any other income received.
Thank you.