I usually suggest new property owners setup a business before they even close on a property and then use a business credit card for all expenses moving forward and also for them to link it to Quickbooks so everything is automatically tracked for them.There are a lot of nuances and strategies but this is a 30,000 foot view of why you should opt for business>personal

Lets say the investor didn't use credit or anything related to credit metrics to buy the property (maybe own cash, OPM or HL, by the time the "refinance" part kicks is, what happens if the owner has credit issues and the financial institution won't proceed?

Start now do not wait you obviously have the good credit and income to start the process.

When you reach the age of 19, it's important to have a reliable source of income, be able to provide a down payment of around 15% to 20%, and maintain a good credit score and debt-to-income ratio in order to be eligible for a mortgage loan.

Additionally, real estate isn't rocket science.

Make sure your financial situation is stable, with a strong down payment, an excellent credit score, and a clear grasp of your budget and objectives.

Try credit unions and small banks.  

Hi Josh, Additionally, consider building conservative assumptions into your financial projections to account for potential market fluctuations, economic uncertainties, and unforeseen challenges.

These include reporting rental income, allocating expenses between personal and rental use, and navigating new limits on mortgage interest and property tax deductions under the Tax Cuts and Jobs Act of 2017.In places like Hawaii, STRs are subject to additional taxes, emphasizing the importance of understanding the local tax landscape.

As long as the total income reported on your tax return matches or exceeds the total income reported on your 1099s, and you have documentation supporting the breakdown of income by property, the risk of audit or inquiry may be relatively low.Pros of the approach:Compliance: Helps ensure compliance with IRS reporting requirements by matching the total 1099 income on the tax return.Risk mitigation: Reduces the risk of IRS flags or inquiries related to unreported income.Cons of the approach:Complexity: Requires additional documentation and statements to reconcile the reported income with the 1099s, potentially adding complexity to the tax return.Time and cost: The additional work required to prepare separate statements for each property may result in higher accounting fees.Ultimately, it's essential to weigh the pros and cons and consider the specific circumstances of your situation.