A good place to start would be to determine The value of the property as is based on income and subtract the improvement costs. 

From this everything subtracts. 

If you want to sell as is they will subtract the money from your proceeds.

At a very high level, cash flow is what’s left when you subtract the expenses from the profit.

Oh wow I jacked up my math when subtracting expenses.

Your new basis is the old basis carried forward plus any additions or subtractions. 

So yes it does include taxes and I subtracted 15% for expenses, capex, and vacancy to total 15%. we just got a new roof, new wh, and ac just got an overhaul maintenance on it so it's all good...I have my mentor doing property management and I trust him.

I told him I would fill the vacancy as quickly as I could, but would be deducting the break lease fee out of his security deposit and...if the vacancy continued into July...I'd also subtract whatever pro-rated days of rent I missed out on. 

But I think I’m going to put a $$ figure on the vehicle and subtract that from the salary I was going to pay.

On a park, you can calculate the NOI by multiplying the number of spaces occupied by the lot rent, and then multiply by 12 months, subtract the expenses (can range from 35-50%, that % depending on the variables above).