Will I have to payback every year if I am on SSDI and get part time employment? That would put me over the 25K limit to file

[Opus 17]

There are two issues we need to discuss.

First, if half your SSDI plus all your other income (other jobs, investments, lottery prizes, gambling, etc.) is less than $25,000 (single) or $32,000 (married filing jointly) then your SSDI is non-taxable.  That is not exactly the same thing as a "25K limit to file".  Depending on your other income, you might be required to file a return even if the SSDI portion is non-taxable, depending on how much your SSDI benefit is and what your other income is.  If half your SSDI is plus your other income is more than $25,000, then a portion of your SSDI will also be taxable.

The other issue you need to consider is that if you can earn more than $1470 per month, the social security administration may consider you able to work and stop your SSDI.

https://www.ssa.gov/benefits/disability/work.html