>From their documentation https://cloud.google.com/free/docs/gcp-free-tier 
(see the row for program initiation)

.....You are not charged unless you explicitly enable billing by upgrading 
your Cloud Billing account to a paid account. You can upgrade to a paid 
account at any time during the trial. *After you have upgraded, you can 
still use any remaining credits (within the 90-day period)*........

This means 

1) If you are still within the 90 day free trial period or you have not 
exhausted the $300 credit, you *will not* be charged 
2) If you have passed the 90 day free trial period or you have exhausted 
the $300 credit, then you will be charged going forward. But remember, the 
charge only happens after you have exhausted the free daily quota
3) If bullet 2 has happened and you want to prevent being charged at all 
(i.e. no charge even after exhausting your free quota), the only way I know 
(and I might be wrong here) is for you to delete your billing account. 
However, most services require you to have a billing account. For example, 
you can't deploy your app to production without having a billing account

*.....* NoCommandLine *......*
*If you miss GAE Launcher, try* https://nocommandline.com

On Tuesday, February 16, 2021 at 12:44:42 AM UTC-8 [email protected] wrote:

> I accidently click upgrade in my Google Clod Platform account when the 
> trial goes over. Is this cost additional charges? If so how can I stop from 
> getting additional charges. please help.
>

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