How To Write A Goodwill Letter To Creditor . Mention the steps you have taken so far to correct the issue and ensure it won't recur. Supply the current date (when you wrote the letter). 8+ Sample Goodwill Letters Writing Letters Formats & Examples from www.sampleletterword.com Own up to your late payment and explain — honestly — why it happened. Your credit may be harmed if you make a late payment. Take responsibility for your mistakes.