The research found that 67% of employers with 1,000 or more employees track the cost of their flex plan, compared with 55% of employers with fewer than 1,000 staff.

Perhaps this is because larger employers have the resources to track their benefits strategies, unlike their smaller peers. On average, the larger the employer, the more likely it is to track the cost of its scheme.

EB-FlexibleBenefitsResearch-PlanCosts1-2014

Read more of the Employee Benefits/Towers Watson Flexible benefits research 2014