OK, so it's only taken in the .net and the .com. The .com is owned by a domainer asking $5000 - with no apparent success despite the name's age (1998).
Assuming the .com is even worth 5000 (just for argument's sake), that would put your .net at $200 to maybe $1000 max in a wonderfully perfect domainer's world. And the world is far from perfect.
I don't see a lot of companies going for these keywords except H&R Block and some Indian companies.
I'm thinking the best you can hope for is a couple hundred dollars from a small tax preparation related company.
Personally, I have much better long .net domains (in terms of searches and CPC), and they rarely get offers. I'm close to dropping them. I would certainly drop this one.