Section 7. Every partnership, other than a corporate trust as defined in chapter sixty-two, having a usual place of business in the commonwealth shall file, on or before the fifteenth day of the fourth month following the close of each taxable year, an information return sworn to by a member of the partnership. Such return shall include the partnership’s income or losses from sources taxable under chapter sixty-two, any deductions or credits attributable thereto, the names and addresses of the partners and the distributive shares of the various classes of partnership income, losses, deductions or credits apportioned to each, and such other information as the commissioner may require in order to determine the taxable income of each partner.