One off pension contribution to keep below £100k?

Hi all, any help appreciated.

I’m in the fortunate situation where I’ve been awarded a bonus being paid before the current tax year ends, however do not have the opportunity to pension sacrifice and keep my adjusted net earnings below £100k (tax trap, childcare hours/tax relief).

I have been told I can make a one off pension contribution and submit a claim to HMRC for tax relief - my question is whether that one off contribution and tax relief claim would lessen my adjusted net earnings and therefore drop me below the £100k mark for the year, or is purely to save on tax?

Also, that additional pension contribution would likely tip me over the £60k tax free allowance for the year - am I correct in assuming I’d just pay income tax on anything over that and it would not impact ANE in anyway?

Many thanks!