SSDI benefits and SSI benefits are treated differently. If you are receiving more than 694 a month, you are receiving SSDI benefits. If it is 694 or less, it is probably SSI benefits.
For SSDI beneficiaries, if you are only working part time, you can keep doing it and receive benefits if you are as you are earning under the SSA limit which is 1010 dollars a month. Please keep in mind that some jobs pay every two weeks so some months you receive three pay checks. Those months will put you over the Social Security limit.
If you earn over 1010 a month, it starts going towards your Trial Work Period. You are allowed to earn over 1010 a month for nine months before your benefits stop. These months do not need to be consecutive. If you earn over 1010 a month once a year, then in nine years your benefits will stop. Please keep track of when your benefits should stop and do not rely SSA to handle it. You may still be receiving checks, but at some point SSA is going to want their money back and overpayment cases can be miserable.
If you are receiving SSI benefits, you are also allowed to work, but any income is going to reduce your SSI benefits. SSI doesn’t worry about the first $85 that you earn. But once you earn more than $85, they reduce your benefits by fifty cents for every dollar that you earn.
Example: You work and earn $1,000 in a month. You receive no other income besides your SSI.
$1000 - $85 = $915.
$915/2 = $457.50
Your SSI will then be reduced by $457.50. SSA may not be keeping track of this or they may be behind. Be aware of what your benefits should be because sooner or later SSA will want their money back and an overpayment notice is not something that you want to have to deal with.
Also be aware that if you return to work but have to stop working due to your disability within one year, SSA will expedite your claim and put you back on disability benefits as soon as possible.