Subtract from that the money you spent already.

And on the other any non essential expenditures like take out, booze, movies, nic-nacks, etc.Now add up all your necessaries for a month and subtract your actual take home pay for a month from the necessities.

When people discuss Cap Rates, I think it subtracts off for all cash expenses EXCEPT Capex.  

I gave him over 20K profit because I subtract it from the arv before I minus the rehab and my fee on that property and he still want more.

If we get an appraisal and he comes back at 135K, I think it makes sense because we could subtract the realtor costs from our buying price since she won't have to list.

After you subtract all of your costs to buy and hold, and make any improvements, is the cash flow worth it?  

Use 50% of income as your expenses, then subtract mortgage payment to determine the Cash Flow.

Prices differ by region.Your question on tracking income/expenses is like asking how to do multiplication before doing addition/subtraction first.

These items are all priced into the market and you can add or subtract to come up with your own. 

Subtract expenses for property taxes, insurance, vacancies, repairs, capex, mortgage, and property mgmt, if needed, from the monthly rent.