He was convicted of all charges. These included (per the Wikipedia link above):
[T]welve counts of willful failure to collect, account for, and pay over Federal income taxes and FICA taxes under 26 U.S.C. § 7202, forty-five counts of knowingly structuring transactions in Federally-insured financial institutions to evade the reporting requirements of 31 U.S.C. § 5313(a), in violation of 31 U.S.C. § 5324, 18 U.S.C. § 2 and 31 C.F.R. sec. 103.11, and one count of corruptly endeavoring to obstruct and impede the administration of the internal revenue laws under 26 U.S.C. § 7212. Twelve of the charges are for failing to pay employee-related taxes, totaling $473,818, and 45 of the charges are for evading reporting requirements by making multiple cash withdrawals just under the $10,000 reporting requirement (smurfing). The withdrawals, totaling $430,500, were placed in 2001 and 2002.
He did not mount a defense at trial and has denied, on cranky grounds, the Court's jurisdiction over him. My ball park guess, based on excerpts from the relevant U.S. Sentencing Guidelins is that he is looking at about 4 years in federal prison, although that may be on the low end of the scale.
The convictions are the culmulation of years of litigation by Hovind against the government, and by the government against him, for a variety of offense, some base, like assault, and some technical, like zoning violations and tax charges.