The right of citizens of the United States to vote in any primary or other election for President or Vice President, for electors for President or Vice President, or for Senator or Representative in Congress, shall not be denied or abridged by the United States or any State by reason of failure to pay any poll tax or other tax.
Section 2
The Congress shall have power to enforce this article by appropriate legislation.
1966 that the U.S. Supreme Court ruled 6–3 in Harper v. Virginia Board of Elections that poll taxes for any level of elections were unconstitutional. It said these violated the Equal Protection Clause of the Fourteenth Amendment. Subsequent litigation related to potential discriminatory effects of voter registration requirements has generally been based on application of this clause.
They should move higher on the basis of the 24th amendment. It makes it quite explicit.
https://constitution.congress.gov/constitution/amendment-24/
Section 1
Section 2
https://en.m.wikipedia.org/wiki/Twenty-fourth_Amendment_to_the_United_States_Constitution