Purple Heart Freedom to Work Act This bill increases the monthly income limit that is used to determine whether certain Purple Heart recipients are eligible for Social Security Disability Insurance (SSDI) benefits. Specifically, when making such determinations with respect to Purple Heart recipients who are entitled to SSDI benefits based on combat-related injuries, the Social Security Administration must use the limit that applies to individuals who are blind rather than the lower limit that applies to other SSDI recipients. In addition, the bill phases out SSDI benefits for these Purple Heart recipients, with benefits reduced by $1 for every $4 of earnings in excess of the limit.