更新1:
please this concerns my credit rating only (i dont care about penaltys) what if i file for extension and say my taxes should be $500 and pay that now. then in 1-2 months when i have the rest i can finish my tax return and pay the full amount + whatever. is there some kind of super penalty for saying i should pay $500 when it turns out to be $7000? other then the .5%/month?