Can I claim Pension Costs as an Expense?
Personal Pensions
Personal payments (i.e. not from the business account) made to a pension fund should not be recorded as a business expense. This is a personal tax issue and is not related to your business.
You will need to provide details of pension payments in your personal tax return.
Business / Employer Pension Contributions
If you are planning on making contributions directly from the company then you will need to ensure this is allowed by the pension provider. For example they need to know not to claim the tax relief on your behlaf automatically for employer contributions.
You should ensure these pension payments come from your business account and not your personal account. These may then be treated as employer contributions and will be tax deductable business expenses. The pension contributions will not be subject to "personal tax relief" and so would not be reported on your self assessment.