Here's a breakdown:Project Details:Property Cost: $50KRenovation Costs: $30KResale Price: $100KProfit: $20K ($100K – $50K – $30K)For instance, if your regular income is $50K, and you add the $20K from the house flipping, your total income becomes $70K.

I added a 5% charge to vrbo to offset the extra cost  

My question is, are there any other potential causes for this sewage backup, and anything else I should be thinking about that could make it much more costly than $1,000 or so to remediate?

By integrating CPAs into the initial discussions, real estate funds can be structured more effectively, with tax considerations and financial goals addressed comprehensively from the start, ultimately avoiding costly amendments and adjustments down the line.

Well worth the cost.

In the portal (they're using Buildium) we have a breakdown of the labor and smoke alarm costs, but there are no receipts attached.

The only payment you should accept is 100% in full, including late fees and court costs, and it has to be in certified funds (cash, money order, cashier's check).

I have a lender in first position (75% LTV) the seller will be financing (20% LTV) and I am contributing 5% LTV + closing costs.

On paper, it makes sense to use such a service to have a predictable cost allocation towards maintenance.

But you may not enjoy book keeping or think your time is more valuable spent elsewhere, hence the desire to outsource services to low cost service providers in India.