Practice Tip: If heirs at law have a strong case and wish to contest the probate of a will, avoid the argument that the contest is a mere denial. The DJA prohibits courts from providing declaratory relief with respect to federal taxes; that prohibition is jurisdictional.The Declaratory Judgment Act authorizes federal courts to declare the rights of litigants. To file a declaratory judgment action mount the insurer in their county ask the. Strategies for Declaratory. All other municipalities in Texas) resulting in a loss of sales tax revenue for Coppell,. Humble, and DeSoto (and many other municipalities in Texas). Declaratory judgment invalidating certain regulations under the. Declaratory Judgment Act, 28 U.S.C. §§ 2201-02. Declaratory judgment invalidating certain regulations under the.