Yes, a principal address for an individual is where you live, or your main home.
For a business, it's your primary business location, which could be your home office, a commercial space, or some other location where you conduct business.
In TurboTax, RPS stands for Refund Processing Service, but I've never seen a screen that asks you to provide an RPS address. Can you reply with more details of what you are working on?
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