Any contract entered into prior to incorporation of your business is a possible liability for you, the "promoter." A promoter is a person or entity acting on behalf of the corporation not yet formed. As a promoter, you remain personally liable on pre-incorporation contracts.
You, as the promoter, will remain personally liable on pre-incorporation contracts until there has been a "novation." A novation is a legal agreement between the promoter, the corporation, and the other contracting party that the corporation will replace the promoter under the contract. Therefore, without a novation, if a corporation is formed and the contract is adopted by the business, you and the business will be liable on the contract.