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The hardest part of self-assessment is signing up with HMRC to actually fill it out.
If you don't have a government gateway account, or whatever they call it... then they will post something to you, and you use that to activate the account.
But once you have the account, the online self-assessment tool is really easy to use.
Depending on the questions you answer, they only give you the forms that are applicable to you.
The only potentially hard part is knowing the terms. If you don't know the name of a particular thing, then sometimes because they're not showing you all of the forms it can be hard to find the right section.
Just ask in here, as others have clearly gone and used self-assessment to make successful claims for their tax relief so they will be able to advise what the sections are called.
Even with all of that, it really won't take more than 30 minutes if you have your P60 to hand.
PAYE is a piece of piss, and even easier if you are PAYE and have a P60.
If you have your login it will take 30 minutes... that's 30 minutes for £180.
If you have any memberships to things, or donations, that were gift-aided, then that can be claimed too.
I would not be surprised if the taxman were to give you a few hundred if you just took the time to fill out the self-assessment. It is very easy with your P60 at hand.