Tax return – association and foundation How to file tax return 6C in MyTax (Non-profit association or foundation) How to file tax return 6C in MyTax (other than non-profit association or foundation) Tax return — other pages How to file tax return 6C in MyTax (Non-profit association or foundation) How to file tax return in MyTax (other than non-profit association or foundation) Late-filing penalty and punitive tax increase Page last updated 2/16/2021