PAYE and higher tax question

[tvradict]

I never thought Id be in a position to ask this...

My understanding of PAYE is very limited, and as with everything government, the HMRC web site just added to my confusion.

I earn a reasonable wage, and every other month, with the way my shifts fall, it's possibly to earn a good amount in overtime. Enough to put us in danger of hitting the higher tax bracket. A few have in the past. This month I've found myself in that very position.

My questions are,

If I earn enough in one month to put myself into the higher tax bracket for that month, will I pay 40% tax, even though I'm highly unlikely to hit £41k gross for the year?

Is 40% tax taken on the whole wage, or just the amount over the 'threshold'.

What is the threshold?

TIA

[tvradict]

Thanks,

Anyone any idea what the threshold is??

[tvradict]

I'm not sure how my employer balances the tax, payroll was subcontracted out a few months back.

Reading through that document and adding in some simple maths, would suggest a monthly higher tax threshold of

£3488 Gross

But it can't be that simple.