In the Finance Act 2012 as per declared service clause (e) of section 66E "agreeing to the obligation to refrain from act, or to tolerance an act or situation, or to do an act" this defination, it can be said that obligation is a legal duty of a person by which he is bound to do or not to do an act because of law, promise, contract, agreement or any other document which is enforceable by law.
Obligation to refrain from act: means any act, which binds a person, of not to do or not doing a particular thing in a particular manner in a given circumstances.
For example : Not compete fees for not doing a particular business or not to practice a particular profession.
Obligation to tolerate an act or a situation : means to accept the occurrence or existence of an act or a particular thing, which is imposed by condition or circumstances, in a contract, agreement or any other document which is legally enforceable by law.
For example : a) Demurrage charges paid to the port authorities for not clearing the goods within a specified period of time b) Penalty for any breach of contract
Carefully reading of the above, my view, it is taxable.