Intertwined but not inseparable. Repeal of the 16th (or any amendment) can not be done by an Act of Congress. It must follow the constitutionally described procedure for amending the Constitution.
I would not put it past congress to institute some form of national sales tax but also leave the 16th Amendment in place.
I’ve been where you are and how you view. I was there years ago. But HR 25 does not allow itself to continue unless the 16th is repealed.
Yes there are people in tax groups inside the federal government or linked to it that would push to have both. That’s been known for a very long time; that danger is covered in HR 25.
Try and understand that there are some really brilliant minds behind HR 25 that have thought through what you are concerned about because it was also their concern and they have designed HR 25 to address all of the concerns. Their debates, discussions and solutions are completed. What remains is for the public to be educated.
Read the legislation here:
https://www.congress.gov/114/bills/hr25/BILLS-114hr25ih.pdf
and read the very last paragraph on the very last page. Note that the people that designed and wrote this 131 page tax reform bill thought it so important to give repeal of the 16th its own title. You can rest assured that hundreds of lawmakers and associated patriots are going to be on top of repealing the 16th in the first minute that HR 25 is signed into law. I know this for a fact as I know many of those involved in drafting this document and I have been involved in presenting it before committees and offices.
You can’t repeal the 16th and then wake up the next day without some means of funding government. That’s what HR 25 is designed to do.
Read though the legislation. You should come away convinced that the writers know very well what they are doing. This document is only 131 pages long. It won’t be much larger when it is codified into statutes and regulations. Compare the conciseness and efficiency of this tax code to come with the 70,000+ pages of the IRC. This tax code to come is innovative, inspired, brilliant and definitely in conformance with founding principles. Importantly, this tax legislation will result in a simplified tax code that CAN EXIST WITHOUT THE 16TH AMENDMENT.
Note also that the entire federal tax code is scrapped and abolished. Even if there were to be lovers of the income tax to come back and resurrect the Federal Income Tax, they would have to start from scratch and it would take a very long time for them to even get something together that would be signed into law. By that time the 16th would be repealed.
Lastly with the 16th repealed, note that the federal income tax is legal as a direct tax so long as there is apportionment.
Without the 16th income taxes can also be levied as an indirect tax that is uniformly applied.
But in both cases above, the income tax fails as a viable tax because history shows that without the 16th Amendment the income tax is almost always unconstitutional. It could never be made to work without the 16th. And now with the 16th in place it is unbearable, dangerous and uncontrollable.