While its arguable that they are interdependent, they are not the same, and libertarians ought to stop treating them as such. Of course this is not to say that we should accept economic coercion, but do consider these thoughts though.
1. While taxation is arguably theft, simply lowering or getting rid of it all together will not safe guard individual liberties. The Cato Institutes former Director William Arthur Niskanen authored multiple empirical studies, showing the “starving the beast” argument doesn’t work. This is understandable when the state can also barrow and create money.
2. Economic freedom could more accurately be described as “economic opportunity,” as my rights to think, do, and buy certain things are not being restricted, it is actually my ability. Similar to the Nozickian theory on private discrimination, if a pizza restaurant was to decide not serve bearded young men, my freedom to eat pizza would not be restricted, my opportunity would. I could still go eat pizza elsewhere or even make my own. So if one’s economic opportunity is restricted, perhaps they can’t buy the new ipad or go to the beach, and maybe they have to settle for a honda instead of porsche, but their freedom to potentially own those things still exist. Though at a point, the restriction of opportunity can become synonymous with restrictions of liberty. This is a good reason libertarians should fear corporate collusion.
3. One has an easier time over coming economic adversity than social oppression. One might tax dodge, enter into black or gray markets, or even take a different type of job. Ultimately, they will work harder to keep more money. In terms of civil liberties, there are no equivalent to working for cash or tax loopholes.
Obviously we shouldn’t have to choose, but by nature people tend to get more worked up about economics because there is a numerical value they can see. They see their pay checks are less while prices continue to rise. Don’t get me wrong these are still problematic, but what people don’t see are their losses in liberty, because coercion has no numerical or monetary value.