If you are only flipping a handful of houses a year, you can probably get by with a spreadsheet, but here are some important items you need to track/consider for tax season & business management:Tracking Project Expenses & Revenues to calculate your project Net ProfitTracking Assets/LiabilitiesProfit & Loss Statements showing Profitability of each projectTracking how much you paid each vendor/contractor for filing Annual 1099sActual vs Budget Tracking so you can see what repairs were over/under budgetBank reconciliation to make sure your accounting books match your bank statementsProvides a history of the business, so you can track financial progress or pull past financials in case of an Audit

I'm purchasing a sfr in Jacksonville for 135k and budgeted 40k for repairs/ in-law apt - ARV $240I'm bringing 70k in and need 80k more to make it happenDo most investors typically  pay this much to rent money for 6 months? 

I plan to use a hard money lender and I will use 15k of my own cash to secure the deal.ARV - 155,000Asking price - 90,000Purchase price - 70000Estimated repairs - 20,000 *This link comes directly from our calculators, based on information input by the member who posted.

And go ahead and pay the rent 

I do most of my own work, so If I buy a house that needs new paint and roof, I'd be paying less than half of the repair cost just in material... and keep what I would pay a contractor... or pay a seller because they just paid a contractor.  

Generally after everything, mortgage vacancies repairs taxes etc, what net profit should be expected per door?

Most of the homes I see under 300K are guts or homes that need a lot of repairs.

I got a quote from a waterproofing and foundation repair company for damned near 14.5k and it's quite a shock.

Basically a HML is another way to obtain a loan, just like how you finance your properties with a bank / mortgage broker.Most of them will finance repairs and acquisition.

You say the market’s hot, what about considering:1 taking the bank’s option to Convert to a 30 year fixed term, with maybe piti of $500/ monthly (See if they will lend you 75% of the appraised value OR use the purchase price Plus a detailed list of your costs and repairs) , and then2 selling on contract or lease option at full market price+, ie $119,000 possibly on terms.Look for 10% or more down and finance them as long as your loan is for.This would recoup your initial investment, $12,000+ and costs plus profits And give you passive income of what $200-250+ net monthly?