Often it is a professionally prepared intend or offer to purchase. 

Many think this won't happen to them, so they don't prepare for that. 

The BRRRR method is so powerful and allows for so much creativity. 

I work for an architecture firm where I create budgets, cash flow projections, prepare and analyze the financial statements, create A/R receivable schedules, etc.

Back then, the business press called this process "creative financing."

I've been inspired by listening to BP podcast #311 with J Scott on how to prepare for the pending market correction.

@Ray LiIt's advisable to engage a tax CPA/EA if you aren't comfortable with the tax preparation process. 

I'm probably going to be using creative financing on as many deals as possible in order to keep sufficient cash reserves and reduce my reload period to acquiring new properties..

I have a great recommendation for a guy who does P&L for each property plus generates great looking monthly owner statements, sets up vendor bills (for housekeepers), prepares 1099s and does all bookkeeping.  

While preparing to for their first purchase they spend all of their time worrying about running numbers, which in my opinion is easy to do once you find a system that works, and they do not spend enough time researching the tenant/property management aspects of a potential deal which are a lot more intricate than running numbers in almost all cases.