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I ended up needing to file an extension for both state and federal tax return. 

I looked up online and believe IRS says that 3520 will also get extended to Oct 15 if there’s an extension filed for the return it self. 

my question:

 

1) is that right? Any downside to actually delay my filing of 3520 (before 10/15)?

 

2) my 3520 is simple and I can actually file it before 4/15. Is there a downside to file 3520 first but filing tax return itself a couple months later?