Small help with tax return

lisyloo

Just wanting a bit of confirmation/reassurance before I take action.

2021/2022 tax year

Left employer 1 - received P45 and then some overtime after P45
Emplyoer 2 - receoved P60 but does not include employer 1 figures

I think I've made a mistake with employer 1 (because I don't have a P60 which makes it crystal clear - and I couldn't use P45).
I have used "total gross" from my last payslip (which includes the overtime)
I think I should have used "taxable pay"

Am I correct?
I believe I can amend my tax return online but just wanting to check I'm correct before making the amendement.

It's usually easy when you have a P60, but now I have a P45 plus a later payslip

To put some numbers on 
P45 says 15,577.42
Overtime was £500

Last payslip says
gross 14,859.19
Taxable pay 16077.49 

so should I use the 16077.49 figure?

[Deleted User]

Yes - taxable pay.

lisyloo

The difference is £835 from employer to share scheme
and £385 private medical insurance paid for by employer

So I think those are both taxable and they've done it via payroll rather than P11d