The annual limit is 60k plus you can back fill any shortfall for the last 3 years.
On top of that you can also salary sacrifice a car if needed to bring the amount under 100k.
The point is that her pay wouldn’t drop anything like 30%.
If you took 150k as entirely cash you would take home 91k each year. If you salary sacrificed 50k to your pension you would then take home 68k. So that means your 50k pension contribution has only cost you 23k cash.
You then need to factor in the loss of funded childcare which is taken away at 100k. This is worth around 8k per child, sometimes more. Add on a further 2k for the loss of tax free childcare as well and you’re looking at about 10k per child.
That means that if you have 2 nursery age children and earn 150k you can salary sacrifice 50k into your pension at almost no cost to yourself. Taking the 150k as cash is just about as bad a financial decision as you could possibly make.
Assuming your children are in nursery for 4 years that means you’re giving up 200k “free” pension contributions. That’s a huge sum to throw away particularly when you consider it will also benefit from maybe 20+ years more growth.