Solved
Amend 1120s to 1120
I need to amend an S corp to an C corp for prior years. How do I do that through turbo tax (they were all filed through it previously). 2015-2018
"C corp is the correct filing, we used S corp for 2015 - 2018."
You will have to purchase the prior years' TurboTax Business versions (2015-2017) to amend those returns.
See https://turbotax.intuit.com/personal-taxes/past-years-products/2015/
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