The personal guarantee allows a landlord to use your personal assets to cover costs if you fail to pay rent, maintenance fees, or other related expenses. The personal guarantee likely binds you to personally pay the rental obligation, i.e., the contract amount. A personal guarantee on a commercial lease means that an individual promised to complete the terms of the commercial lease even if the business were to close. Be prepared to provide a personal guarantee or walk. Some landlords require new business owners or shareholders to personally guarantee the commercial lease. By signing a personal guarantee, the tenant is putting most of their assets up as collateral for signing a lease. 10. Personal Guarantee. The personal guarantee in a commercial lease makes you, the tenant, personally liable for any rent your business's profits cannot cover. A lease guarantee commits the individual who signs it to pay the landlord throughout the duration of the lease.