It’s Mortgage Principal, Not Principle - The Truth About. Loan Principal and Interest (How To Pay It Off Quickly). Principal vs. Principle: What's the Difference? - Writing. What Is a Mortgage Principal, and How Do You Pay It Off? - Business Insider. 401(k) & 403(b) retirement plans | P. Mortgage Principal And Interest: What's The Difference?. Paying Down Principal on Mortgage: What to ..