I work in systems development for a university IT department, and I'm in the University Superannuation Scheme (USS). My employer contributes 21.6% of my salary to the scheme. I'm looking around for a new job, and saw one today with a multinational company that interested me, but the employer only contributes 3% of salary to their scheme. I don't know what the salary is, because the job spec doesn't say. It may be negotiable. But would I be right in thinking it would need to be at least 18.6% above my current salary to break even? (Assuming everything else is equal, which obviously it probably isn't because USS has a Defined Benefit element to it and zero fees, whereas the potential new employer's pension probably doesn't, and I'd probably get get less annual leave with the new employer, etc etc).
Recent leavers making similar moves have got up to 50% pay rises, so it's definitely worth looking, but it's helpful to understand where the break even point approximately lies.