Do I have to file my 17 year old son as a dependant?

This year, i get the full 2000 tax credit, but next year, the tax credit for my son will only be $500.   I setup a brokerage account when he was about 5 years old, so he would have monies for college or first home.  I have been filing him separately for years as he has interest/dividends and capital gains.  He has however been filed as a dependent. 

 

Next year, i think it will be more of a savings if he files as single and i no longer claim him as a dependent so he can get his own tax deductions and maybe no longer be tied to our tax rate.  Currently, i file as Married Joint return with 1 dependent.

 

Is that allowed, or must he continue to file as a dependent?  His 2023 taxable income was 11,624.00