Do you know that any contract, simply put, is illegal and considered non-legal when enforced on employees for the organization's benefit? Contracts are deemed null, void, and invalid due to the infringements on violating laws.
Legal Standpoint on Contracts
From a legal standpoint, a contract is invalid if it is acquired under coercion or duress. Even if the employee willingly signed it, any physical or other harm caused might pose an archetypal threat to an organization. The fact is, trying to be practical and realistic by extending a one-year contract or an ascertain contract with 11 months would definitely not ensure the safety of any employer (which might raise incongruity) for both the employee's and employer's future.
Alternative Clauses to Consider
Instead, you may consider including clauses such as Non-disclosure, Misrepresentation, Confidentiality, etc. This would lead to employees working happily rather than feeling abstracted and depleted.
Note: A contract is meant to be a safeguard against illegitimacy.
Thank you.