As long as you stay in the Scheme, your employer should continue to pay contributions based on your pensionable earnings before you started your leave.
Your contributions will be based on your actual earnings during your parental leave. For example, if you’re getting statutory maternity or paternity pay, this is what your contributions will be based on.
If you decide to take unpaid leave after your paid parental leave, you don’t have to carry on contributing to the Scheme. Your employer can also stop contributing unless your employment contract says your employer must contribute to your retirement savings while you’re on unpaid leave.
When you return to work you can pay extra contributions to make up for the time you were on unpaid leave if you want to.