As detailed in Internal Revenue Code (IRC) Section 4945(d), a taxable expenditure is an amount paid or incurred to:
Attempt to influence legislation, known as lobbying
Influence the outcome of any public election or carry on any voter registration drive, unless certain requirements are met
Make a grant to an individual for travel, study, or other similar purposes, unless certain requirements are met
Make a grant to an organization, other than most public charities or exempt operating foundations, unless the private foundation exercises expenditure responsibility for the grant
Carry out any purpose other than the private foundation’s exempt purpose