It depends on the form (check or securities that were distributed to you) of the distribution from the trust and the character (interest, dividends, capital gains, IRA, etc.) of the income that was generated within the trust. The trustee is required to provide you with a K-1(Form 1041) itemizing the amounts and type of income to report on your individual tax return. For example, if the distribution you received was generated from a CD that matured in the trust, then only the interest on the CD would be taxable and this interest amount should be reported on the K-1.
You should contact the trustee to obtain the specific taxable amount as a large portion of the distribution may be income tax-free.