That may not matter. My PM looks at period of income, in whatever way it comes. Tax returns may be acceptable- I don't see the income or the proof. (In a way that's good- I wouldn't be happy showing my proof of income to just anybody, there's no professional ethics).I certainly don't consider myself a dodgy tenant, but I'm sure to a PM, I am.
I wouldn't have references, or employment history to show.
People without a rental history who have owned their own homes are acceptable a tenants.
As hard as it may be for people freshly graduated, after one very bad experience, I would regard this as a minus.