Is it possible for us to “downgrade” a Google Apps account after we have gone for the paid version? I don't mean during the guarantee period (if there is one).
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possible duplicate of Can one still get a free Google Apps Standard account? – Jacob Jan Tuinstra Apr 8 '15 at 9:59
If the domain is running the free trial of Google Apps for Work it's possible to downgrade before the trial period ends. After that, it's not possible to downgrade.
Reference
Downgrade to legacy Free edition - Google Apps Help