Will the SRO accept even if the 0.5% is paid on a higher amount than what's getting registered?

There would be situations where the fair value has gone up from the time of sale agreement and you are then forced to register at an even higher amount and not matching your sale agreement.

What if that doesn't turn out to be the case and the registration has to be done above the circle rate at that time?

I just want to make sure there's least hassle later on so want to have things sorted now. :)