According to Section 464 of the Companies Act, 2013, a partnership firm can have a maximum of 50 partners unless it is registered as a company. Currently, the partnership firm has 45 partners. The maximum allowable limit is 50 partners. \[ \text{Remaining partners that can be admitted} = 50 - 45 = 5 \] Therefore, only 5 more partners can be admitted into the partnership firm.