E.g
You put $1.4M into pension when TBC $1.6m
3 years later balance is $1.7M. TBC now $1.8M
if you then want to add more, you can add up to $225k ($200k unused TBC+2/16×$2000) directly
But
If you withdraw $200k as lump sum, you can add $450k ($400k unused TBC+4/16×$2000) overall getting another...