"Taxman" was influential in the development of British psychedelia and mod-style pop, and has been recognised as a precursor to punk rock. When performing "Taxman" on tour in the early 1990s, Harrison adapted the lyrics to reference contemporaneous leaders, citing its enduring quality beyond the 1960s. The song's impact has extended to the tax industry and into political discourse on taxation.
Unlike their other political songs, which are fairly vague peace&love jobs, this one tackles a concrete issue: It protests the 95% top marginal tax rate.
You've heard how "the boomers" screwed up everything for later generations. Here's exhibit A from pop culture. Don't just think about evil, old men in smoky backrooms.