If the claimant, or in a joint claim either of the claimants, is
required to make an SA return, the TC enquiry window will close on
the same date as the SA return becomes final. This will normally be
the anniversary of the date they filed their SA return.
However, the normal position is varied where the SA return
is amended or issued late or a SA enquiry is open or has been
closed:
if an SA enquiry has closed, see CCM12660.