You haven't really given enough information.  I assume that the £51,749 is employment income and the £11,205 is PAYE deducted at source but you haven't made it clear whether that's the case or if it's more complicated than that.

Assuming that that is the only income to go onto the tax return:

Total income = £54,925 (£51,749 + £3,176)

Taxable income = £48,450 (after deducting the £6,475 personal allowance)

Tax liability = £11,900 (being £37,400 x 20% and £11,050 x 40%)

As you've already paid £11,205, that leaves £695 outstanding.

If you're using the HM Revenue & Customs software, then it should calculate the liability correctly.  If it's saying £911 is due, then either there is something else on the tax return that you haven't mentioned or you've inputted the figures incorrectly.  A liability of £911 arises, for example, if the P11d cash equivalent is entered as £3,716, instead of £3,176.

If the £11,205 is the tax deducted figure from your P60, then this is just PAYE - it won't include national insurance.

citroen999 wrote:

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k, but does the figure that goes on the Self Assessment need to include NI in that figure?

 

clutching at straws..lol

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 No just PAYE.