One of the best, most cost-effective things they could do is publish a list of the top, say, 5,000 tax delinquents, similar to California[0] (which gets some good results).<p>edit: this would require a change to the law, not something IRS can do on its own<p>[0]<a href="https://www.ftb.ca.gov/about-ftb/newsroom/top-500-past-due-balances/index.html" rel="nofollow">https://www.ftb.ca.gov/about-ftb/newsroom/top-500-past-due-b...</a>