To arrive at the figure of NRE you need to deduct such items as:
from the figure of relevant earnings.
Form PP43B should be used to calculate the NRE for personal
pension purposes. Side A of the form is for self-employed
individuals and Side B for employees.
Once you have worked out the figure of NRE you can calculate
the amount of relief due (relievable contributions) by reference to
the statutory percentage limits.