Working and SSDI Benefits
"Generally, you can't start doing "substantial gainful activity" (SGA) and continue to receive disability benefits. In a nutshell, SGA means you are working and making more than $1,070 per month (or $1,800 if you're blind). There are exceptions to this rule, however. For SSDI recipients, there is a trial work period during which you can make more than the SGA amount without losing your benefits. (For a discussion of how much you can work when applying for benefits, see our section on working and eligibility for Social Security disability.)
SSDI recipients are entitled to test their ability to work and continue to receive full benefits regardless of whether they make more than the SGA amount, for a nine-month trial work period. For 2014, the SSA considers any month where a person has a monthly income of more than $770 a trial work month. If you are self-employed, any month where you work more than 80 hours (or earn more than $770) is a trial work month.
Once you have completed the nine-month trial work period, you can still receive SSDI for any month where your earnings fall below the SGA level, for a period of 36 months. This is called the extended period of eligibility. In other words, if you earn more than $1,070 per month, you won't get disability benefits for that month.
If your SSDI payments have stopped because your income is substantial, the SSA gives you five years during which your benefits can be reinstated if you stop work because of your disability. During the five-year period, the SSA will not require you to file a new disability application to get benefits. This is called expedited reinstatement.
If you lose your job during the trial work period, your disability benefits will not be affected. If you lose your job during the 36 months following the trial work period, and you are still disabled, you will need to call the SSA to have your disability benefits restarted."
http://www.disabilitysecrets.com/page1-13.html
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SSDI website has a Youtube video on the subject also! 
Check it out----> https://www.youtube.com/watch?v=s1D7...=youtube_gdata