The phrase 'there is a plan' is correct and usable in written English. It can be used when discussing the existence of an idea or plan, often to imply that the plan is already in place. For example, "After much deliberation, the board of directors have decided that there is a plan to increase profits."
There is a plan.
"I assume there is a plan.
Make sure there is a plan.
If there is a plan.
There is a plan to test the assumptions.
"This tells you there is a plan behind every charge.
BRONCOS Surely, there is a plan here somewhere.
Perhaps there is a plan to justify the wait.
"There is a plan for a pasta bar back over there".
There is a plan for two more films, with the next one already in development.
And there is a plan for a park from West 8 Urban Design & Landscape Architecture.
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Claudia Letizia
Head Translator and Proofreader @ organictranslations.eu