The real estate investing industry uses "Classes" to rank property performance risk, but there's NO agreed upon industry model:(Here's what we use for our Metro Detroit market:Recommend you first figure out the property Class you want to invest in, THEN figure out the corresponding location to invest in.Property Class will typically dictate the Class of tenant you get, which greatly IMPACTS rental income stability and property maintenance/damage by tenants.If you apply Class A assumptions to a Class B or C purchase, your expectations won’t be met and it may be a financial disaster.If you buy/renovate a property in Class D area to Class A standards, what quality of tenant will you get?

If the house has a septic system, especially if it's an older one, it's worth the investment to have a septic inspection done.This concern is particularly relevant for those planning to buy and hold the property rather than simply fix and sell it.

Earlier in your post you shared that your friend planned to pay the contractor invoice but at the end of your post you ask whether your friend should pay the invoice in full.....and this is after selling the property and presumably being recapitalized. 

But I don't know your personal situation and all the financial details. 

Quote from @Daniel Tanasa: Another option is to get a small cash out refinance from the house you plan on fixing up, if is in financeable condition, and use that to fix it up, while still cash flowing.

By understanding the costs you may encounter upfront, you can take control of the process.Here are just a few things experts say you should be thinking about as you plan ahead.1.

Great tools that get updated regularly.I am on the lending side of things and would be happy to hop on a call with you anytime to discuss financial strategies and help answer any questions you may have about nearly any loan product available to help you on your journey, even if they are not products my capital partners offer.We are all here to help you learn and grow.

I'll add a few more things that can have a huge financial impact: required reserves, LTC (loan to cost), application or other upfront fees, and prepayment penalties.As a fellow flipper, I think it's important to have reserves, but they shouldn't be required as part of your funding.

Quote from @Richard Eric Hughes: My question is what ae you planning to do?

A good real estate accountant can save you thousands of dollars by leveraging entity selection and formation, tax deductions, cost segregations, bonus depreciation and tax planning.I recommend finding an accountant who specializes in real estate taxation, business taxation, financial planning and tax planning.You may want to consider working with your accountant remotely to expand your options.I would also recommend looking for a accountant willing to work with you throughout the year.