Just as an example, FL tax lien is a guarantees 20% return. 

She didn't raise rents, left a unit vacant for 5 years, and didn't pay taxes on 2 of them for the last three years.

Second lowest property taxes in the nation behind Hawaii.Montgomery county tax estimate formula is: appraised value x 20% (without homestead) x .0365

Background is she’s about 4 months behind in total rent, original lease ended in December, now going month to month because I didn’t want to put her out as she’s a single mother with 3 kids (also didn’t have the bandwidth to go through the eviction process because this property is in another city)I hired a property manager to help and we’ve recouped a bit of money but she’s still about 6500 owed.

Selling = taxes. 

The landlord said that its not zoned for business and that would raise flags with the IRS and i could potentially get audited. keep in mind that i have a consulting business. is there some truth to this because i do have a home office at the house as well. the rent is 1600 per month. that 1600 per month and utilities wouldn't be a tax write off to my LLC?

For example, for property taxes, you can search Google for what the state taxes are on a primary/secondary property.

Hi thereI am new to investing, looking at a SFH for my 1st rental property and trying to understand the tax benefits that are often spoken of on the podcasts. 

Supreme Court's Wayfair decision, Pennsylvania may require collection and remittance of taxes from businesses that have a substantial economic nexus in Pennsylvania"But from this site, it looks LLC needs to file Penn state tax no matter its size:https://www.revenue.pa.gov/TaxTypes/Partnerships-S-Corps-LLCs/Pages/default.aspx#:~:text=Limited%20Liability%20Companies,pay%20corporate%20net%20income%20tax."

For other variables such as tax rates and heating costs, I find it easier to get a good evaluation.