Donations to My Giving Helps to support Massachusetts General Hospital and/or United Way are tax-deductible to the full extent of the law. Mass General and United Way are 501(c)3 non-profit organizations and depends on the support of the public. Mass General’s tax ID is 04-1564655. The United Way’s non-profit tax ID is 04-2382233. Questions about giving to My Giving Helps? Please see our FAQ or contact us.