Reimbursement is the act of compensating someone for an out-of-pocket expense by giving them an amount of money equal to what was spent. Companies, governments and nonprofit organizations may compensate their employees or officers for necessary and reasonable expenses; under USlaw, these expenses may be deducted from taxes by the organization and treated as untaxed income for the recipient provided that accountability conditions are met. UK law provides for deductions for travel and subsistence. Reimbursement is also provided for supply, day care, mobile, medical, or education expenses, as determined by the payer. Similarly, a university, academic conference, or business conference may reimburse the expenses of an invited speaker or attendee.