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My tenant wants to pay rent through their company: Should this raise a red flag?
I disagree with the other respondents. If your tenant is an individual, renting in their individual capacity, there is no reason they need your SSN. They will not be sending a 1099 to you. If your tenant is a business, then your property is not a residential property. It is at least a "corporate housing", and you would have noticed that the contract was signed by a company representative in the capacity of being a company representative, not an individual person. In that case, that representative would also ask  you to fill a form W9, on which your tax ID should be reported. I would suggest let the tenant figure out their tax avoidance issues without you being involved.