What New Hampshire tax returns would a self-employed small business owner with revenue of $250,435 and investment income potentially need to file?\ Business Enterprise Tax (Form BET), Business Profits Tax (Form NH-1040).\ Interest and Dividends Tax (Form DP-10), Business Enterprise Tax (Form BET), Business Profits Tax (Form NH-1040).\ Interest and Dividends Tax (Form DP-10), Business Profits Tax (Form NH-1040).\ Interest and Dividends Tax (Form DP-10), Business Enterprise Tax (Form BET).