HMRC doesn't have end client details, just agency details and HMRC assume (as is likely the case that as you change end client 99% of the time you change agency)..
So if the agency says you worked for them in March outside and worked for them in April inside - HMRC see you as working at the same place and 99% of the time they will be correct.
Switch agency and HMRC doesn't have enough information to argue anything so chances are they won't bother.
So if the agency says you worked for them in March outside and worked for them in April inside - HMRC see you as working at the same place and 99% of the time they will be correct.
Switch agency and HMRC doesn't have enough information to argue anything so chances are they won't bother.
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