LLCs are a legal tool, not a tax one.Transfer from personal name to LLC/Due On Sale ClauseIf one is transferring property title from personal name, a Grant/Warranty Deed would be drafted/recorded to transfer title.

Were the transfers from the tenant credit card or ACH transactions. 

If you already have existing property and transfer property to an LLC, then it could trigger the due on sale clause the bank.

.- Property Transfer Tax (Grunderwerbsteuer): 3.5-6.5%, depending on the region- Land Registration Fees: Approximately 0.5-1.5%.- Realtor Fees: As mentioned, these range from 3-7% of the purchase price, plus VAT.Benefits for Service Members- Equity Building: Owning property builds equity over time, providing long-term financial security.- Strong Rental Potential: If reassigned, you can rent the property out in Germany high-demand rental market.- Tax Advantages: Germany offers tax deductions for property owners, which can help offset some costs.Key TakeawaysService members have a unique opportunity to buy property in Germany with minimal upfront costs.

This appears to be a 'transfer tax' instead of an income tax. 

I agree with the others here that say you need to have some skin in the game, if you are going to live there yourself, get an FHA loan rather than owner financing, you can get a 3.5% down loan, personally I do not love these as they require  PMI which is an additional expense, and you also need  bring additional funds for closing at least for taxes, title, attorney and transfer fees . borrowing from anyone else for the down payment, to include a personal loan from the bank is not a good idea, those again will be higher int. rate.

If it's a QM you won't be able to close in a business entity like a LLC, although in some cases you can transfer into an LLC after closing.

One key factor to confirm is whether the STR permit is transferable, as regulations can change.

Transfer from personal name to LLC/Due On Sale ClauseIf one is transferring property title from personal name, a Grant/Warranty Deed would be drafted/recorded to transfer title.

You can make an LLC and transfer it over.