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22.0414 filing a 2021 extension just in case I don't have time to complete return by April 18 2022 deadline.  

I'm miffed & puzzled on TurboTax (TT) online extension.

I have TT on my computer.  I completed extension only to discover I can not e-file.  So, I ventured to TT online and input same #s.

line 4, positive #

line 5, positive larger #

line 6, per instruction, should be a ZERO (is on Mac software).

Online extension though, line 6 showed me owing what I should be receiving.  Unfortunately, I did not discover TT ERROR (because no preview function is available) until I downloaded the form, after being submitted.

... I don't think I'll have an issue because I'm owed money.  However, this is unnecessary anxiety.