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overpayment for purposes of Section 909 of this Act. (5) Nonresidents. A nonresident individual who is a partner or shareholder of a partnership or Subchapter S corporation for a taxable year for which an election is in effect under paragraph (1) shall not be required to file an income tax return under this Act for such taxable year if the only source of net income of the individual (or the individual and the individual's spouse in the case of a joint return) is from an entity making the election under paragraph (1) and the credit allowed to the partner or shareholder under paragraph (4) equals or exceeds the individual's liability for the tax imposed under subsections (a) and (b) of Section 201 of this Act for the taxable year. (6) Liability for tax. Except as provided in this paragraph, a partnership or Subchapter S making the election under paragraph (1) is liable for the entity-level tax imposed under paragraph (2). If the electing partnership or corporation fails to pay the full amount of tax deemed assessed under paragraph (2), the partners or shareholders shall be liable to pay the tax assessed (including penalties and interest). Each partner or shareholder shall be liable for the unpaid assessment based on the ratio of the partner's or shareholder's share of the net income of the partnership over the total net income of the partnership. If the partnership or SB3019 Enrolled LRB104 20255 HLH 33706 b Public Act 104-0468