Sep 10, 2026 · 14 min · 10 segments
HMRC has 12 months from the date you file to open an enquiry into your tax return. These enquiries are rare. LSR Partners have submitted thousands of returns and have seen one opened on their own…
Laura SantHost
Simon RoueHost
Usually HMRC have a 12-month window from when you file a tax return to open this Section 9a inquiry.

in general it will be if there is something on your tax return that they think looks a bit funny but they can't necessarily prove like one way or another so just before we kind of totally go into section 9a's um we sometimes we will have it where maybe a client has provided us with their employment income so we have a p60 but they haven't provided a p11d um And when the return is submitted, HMRC say, ah, but we've got a P11D on our system.

Alternatively, we sometimes get they'll do... letters if they think people have had P11Ds and they'll do like bulk letters to people say, I think you might have P11D, we'll give you to the state to amend your tax return before we open an inquiry.

So there's often things where they've got some information and they just issue a calculation and we look at it and go, yeah, it's fine, move on.

If we don't have agent authority and we don't have visibility of these things, then that's the sort of thing that you can get.

Usually HMRC have a 12-month window from when you file a tax return to open this Section 9a inquiry.

in general it will be if there is something on your tax return that they think looks a bit funny but they can't necessarily prove like one way or another so just before we kind of totally go into section 9a's um we sometimes we will have it where maybe a client has provided us with their employment income so we have a p60 but they haven't provided a p11d um And when the return is submitted, HMRC say, ah, but we've got a P11D on our system.

Alternatively, we sometimes get they'll do... letters if they think people have had P11Ds and they'll do like bulk letters to people say, I think you might have P11D, we'll give you to the state to amend your tax return before we open an inquiry.

So there's often things where they've got some information and they just issue a calculation and we look at it and go, yeah, it's fine, move on.

If we don't have agent authority and we don't have visibility of these things, then that's the sort of thing that you can get.
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