"Going forward" is relatively new and often used in business English to indicate some change in the way things are done. It is also used to elaborate on a company's direction or corrective measures to a current problem and imparts a sense of purpose by getting employees to envision a future right now. "Going forward" can be a superfluous expression. Example: Going forward, more resources will have to be/are going to be allocated for our RTD in order to stay innovative and maintain our market share. The sentence still makes sense without "Going forward" because the modal verb "will" and "going to be" already points to a future scenario. (More resources will have to be / are going to be allocated for our RTD in order to stay innovative and maintain our market share.) "From now on" is similar to "Going forward" in terms of its future setting. It is often used to set a rule or regulation that takes effect from the moment of speaking or writing. Example: "No late submission of homework will be entertained from now on." Here, the teacher may have accepted late submissions in the past, but has decided to set a new class rule that will take immediate effect. Again, the meaning stays the same with "anymore" (Late submissions of homework will not be entertained anymore). Just as a side remark, many superfluous expressions have crept into daily usage. I hope this helps.

They can at times be interchangeable. Going forward, I want all incidents to be reported. From now on, I want all incidents to be reported. . Maybe we can find circumstances when they are not interchangeable. By going forward, we are making an irrevokable decision. <-- ok From now on, we are making an irrevokable decision. <-- Not ok . Perhaps the difference is that "from now on" has a continuous sense. "Going forward" can act as continuous or instantaneous. . Maybe someone smarter can give you a better answer.

Not much really, just different ways of saying the same thing. To me though, "from now on," always seemed more time specific. Any competent English speaker would exactly what you meant

Example use?