I highly recommend you study this, practice it, and apply it.https://www.biggerpockets.com/blog/rental-property-cash-flow...Property Details:Type: Single-family homePurchase Price: $289,900Down Payment: 20% ($57,980)Loan Amount: $231,920Interest Rate: 6.85%Loan Term: 30 yearsMonthly Mortgage Payment:Using a mortgage calculator, your principal and interest will cost $1,515 per monthRental Income:Average Rent for Single-Family Home: $2,171 per monthOperating Expenses:Property Taxes: $300 per monthInsurance: $100 per monthMaintenance and Repairs: Budgeting 5% of rental income ($109 per month)Vacancy Rate: Assuming 5% vacancy ($109 per month)Property Management Fees: If outsourced, typically 10% of rental income ($217 per month)Total Monthly Expenses:Operating Expenses: $835Mortgage Payment: $1,515Total Expenses: $2,350Net Monthly Cash Flow:Rental Income: $2,171Total Expenses: $2,350Net Cash Flow: -$179 per monthConclusion:In this scenario, the rental income of $2,171 per month does not fully cover the total monthly expenses of $2,350, resulting in a negative cash flow of $179.

Here’s a breakdown of some of the information you may need to provide for a cost segregation study.For existing buildings:List of equipment on the propertyProperty settlement stateAny appraisals or purchase/lease agreements Property maps or blueprintsSchedules, change orders or documents for future renovation plansSupporting documents for calculating real property book valuePrevious purchase price allocations that separated assets into their appropriate allocation and valuePast site inspections and photographsDocumentation that proves or records deterioration of assetsFor new construction:Contracts or contract paymentsLand and property sizeBlueprints of projectList of equipment involved or purchasedList of projected costs including costs for land developmentApplicable site inspectionsConstruction schedules and payment requestsPhotographs of completed assets or work in progressCost segregation specialists typically have an organized plan for the collection and analysis of the information provided.

I mainly use Awning.com Airbnb rental calculator to estimate annual rev for an STR 

It is is going to calculate the expected price based off what you tell it as well as what Price Labs sees in the local market.I questioned myself moving to price labs after I had been doing this manually for several years.

I did not calculate no.

Here's a bit more in detail about how rates are calculated for DSCR loans:1.

View report*This link comes directly from our calculators, based on information input by the member who posted.How can I get this to Cashflow?

You cannot calculate rent by subtracting off the rent of the ADU.  

I'd like to get $30k, I'm just not sure how to calculate the percentage of ownership that would amount to.

Loan had high terms of 9.5% calculated to 20 years and a balloon payment on the 3rd year coming up this April 1st.