Making AVC'S at low rate relief or no relief

Brendan Burgess said:

What is the interest rate on the mortgage?

Unless it's a very cheap tracker, you would be better paying it off.

You are borrowing at the mortgage rate less tax relief to put it on deposit at 0%

Brendan

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KBC .75% tracker.
Quick question Brendan on RIP to local authority Mortgage interest tax deductible 100%. Is it only worth paying down mortgage on principal residence as Interest is not deductible?
In other words if you have a RIP and it is making profit and even if you are paying say 3% interest it makes no sense to pay down principal sum? Cheers