If my partner of 12 years used to recieve disability social security but now recieves regular social security, can I claim him as a dependent

[Bsch4477]

You can claim him if he lived with you all year and you provided more than half of his support and he had less than $4,400 in taxable income. Social security would not count if not taxed. 

[xmasbaby0]

The type of Social Security benefits being received have never made a difference---what matters is whether he had any OTHER income.   If the person you want to claim as a dependent has less than $4400 of income not counting any Social Security and they lived with you for the WHOLE year, you may be able to claim them as a qualified relative and get the $500 credit for other dependents.

CREDIT FOR OTHER DEPENDENTS

https://ttlc.intuit.com/questions/4499708-what-is-the-500-credit-for-other-dependents-family-tax-cre...

[MarilynG1]

If your partner has no other income besides Social Security, he will not need to file a tax return.   See more info on Is My Social Security Taxable?

As for whether you can claim him as your dependent, that depends.  Do you provide more than half of his support?  Click this link for details on Claiming a Dependent.