Water gushing into basement from first floor toilet

[Matawanakee]

I turned off the water shutoff under the toilet and that stopped the leak. I cannot see where it is leaking from?

it is not where the line connects to the toilet.

 

[Plumber69]

You haven't given us much info

 

[Sponsor]

 

[Tuttles Revenge]

If its not leaking from the supply line but leaks when you flush it next and its not leaking from the tank to bowl connection.. then its leaking either from a failed wax gasket(most likely), or a broken drain pipe (less likely, but possible)