The 1000 you can earn / month is net. Over the 1000 they claw back your benefits 75 cents for every dollar earned, which isn't great.
I'm glad you've found an organization that works with people with disabilities. I worked with one a few years ago and found it very helpful.
Good luck with everything.
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"I danced in the morning when the world was begun. I danced in the moon and the stars and the sun". From my favourite hymn.
"If you see the wonder in a fairy tale, you can take the future even if you fail." Abba