Yes you might have to file a tax return. You should file a Joint return for all the part time income and the Social Security and SSDI. Doesn't matter if it's just SS or SSDI (they are taxed the same)
Up to 85% of Social Security becomes taxable when all your other income plus 1/2 your social security, reaches:
Married Filing Jointly: $32,000
Single or head of household: $25,000
Married Filing Separately: 0
