Evasion of income tax is a crime involving moral turpitude

"ZARI v. FLORES, Adm. No. (2170-MC) P-1356, November 21, 1979, 94 SCRA 317, 323, is one case that has provided jurisprudence its own list of crimes involving MORAL TURPITUDE, namely: adultery, concubinage, rape, arson, EVASION OF INCOME TAX, barratry, bigamy, blackmail, bribery, criminal conspiracy to smuggle opium, dueling, embezzlement, extortion, forgery, libel, making fraudulent proof of loss on insurance contract, murder, mutilation of public records, fabrication of evidence, offenses against pension laws, perjury, seduction under the promise of marriage, estafa, falsification of public document, and estafa thru falsification of public document."

EDGAR Y. TEVES, Petitioner, vs. THE COMMISSION ON ELECTIONS and HERMINIO G. TEVES, Respondents. EN BANC. G.R. No. 180363,. April 28, 2009.

https://lawphil.net/judjuris/juri2009/apr2009/gr_180363_2009.html