As a high earner, you may be affected by the tapered annual allowance.
The taper could reduce your annual allowance to as little as £10,000 if you have an ‘adjusted income’ of over £260,000. Adjusted income is your total income, plus the pension contributions your employer pays in for you.
Making the most of any unused pension allowance, using carry forward, means you could pay more in and get extra tax relief.