The new employer just needs your details to identify you correctly with HMRC.
You can give them sufficient detail without handing over your P45 or income data. I have never given a P45 to a new employer and it has never been a problem.
It's possible that your tax code will reveal some information, if you're still in the same financial year, but this is an unreliable way of calculating salary.
You can give them sufficient detail without handing over your P45 or income data. I have never given a P45 to a new employer and it has never been a problem.
It's possible that your tax code will reveal some information, if you're still in the same financial year, but this is an unreliable way of calculating salary.