Get your taxes done using TurboTax

but efile shuts down tomorrow at  midnight so then I woudol have to mail everything i am tryhing to get it done but was told could take 24 hours to get accepted - if i dont submit correctly and efile now then i cannot efile correct? But gives me more time  -but wont I get penalty for late - my sons taxes im doing and have 3 other  s and tate i doent want to snail mail them all