For purposes of determining whether an employee fringe benefit is taxable to the employee, the same rules apply whether the employers are tax-exempt organizations or private sector businesses. If the employer has an educational assistance plan, then reimbursements up to $5,250 for any higher education costs are tax free. If the reimbursements are for courses that are job related, there is no dollar limit on the tax-free benefit.
On Form 1040X, you may file an amended return within a three-year period to claim a refund or correct a mistake made on an original or previously amended return.