Set loan terms with larger payments at the end. CURRENCY: All principal and interest payments shall be made in lawful money of the United States. 7.Washington promissory notes should highlight the relevant payment information. Get a non-bank loan that's paid back in installments with a secured promissory note. Create and download a promissory note for free! Use our free, attorneycrafted Washington Promissory Note template. Find out what's included in the agreement and how to write it.