IPA: /nɒnˈtæks/
KK: /nɑnˈtæks/
A fee or charge that is not classified as a tax.
The government introduced a nontax to fund public services without raising taxes.
Nontax is formed from "non-" (meaning not) and "tax" (from Latin "taxare", meaning to assess or estimate). The word "nontax" refers to something that is not subject to taxation.
Think of 'non-' meaning not, and 'tax' meaning to assess. This helps you remember that 'nontax' refers to something that is not assessed for tax.