A House panel on Tuesday found Representative Charles B. Rangel guilty of 11 counts of ethical violations, ruling that his failure to pay some taxes, improper solicitation of charitable donations and failure to accurately report his personal income had brought dishonor on the House.

After a public hearing on Monday that was truncated when Mr. Rangel walked out in protest, an adjudicatory subcommittee of the House ethics committee deliberated for four hours before finding him guilty of all but one of the 13 counts against him. (Two counts, involving Mr. Rangel’s misuse of House mailing privileges, were merged into one.)

In a somber tone, Representative Zoe Lofgren, Democrat of California and the chairwoman of the panel, announced the findings just before noon. Ms. Lofgren described the contentious process as “difficult and time-consuming.” The entire committee is to decide on Thursday what punishment to recommend for Mr. Rangel. The full House must vote on the recommendation.

While the rules permit a range of penalties, up to expulsion, ethics experts and panel members have said that Mr. Rangel, 80, is more likely to face a reprimand or a formal censure. Mr. Rangel, a Harlem Democrat, did not appear before the panel as it announced its verdict, but he released a statement shortly afterward calling it unfair because he could no longer afford a lawyer to mount a defense. And, even though he was the one who stormed out of the proceedings on Monday, he complained that the panel had taken action when he was not present.