1.Log in to your online Defined Contribution Plan account. Allegheny County's benefits package includes medical, dental, and vision coverage to support overall health and well-being for employees and their families.The 457 plan is a deferred compensation plan that allows employees to contribute their own monies pre-tax into a supplementary retirement plan. 457(b) Deferred Compensation Plan. Learn how to start investing and find out which options are available for this plan. Current Baltimore County Government employees can view and apply online for promotional jobs. Set aside money towards their retirement. Most state employees are eligible to participate in the voluntary Deferred Compensation Plan, commonly referred to as "deferred comp.