How To Write A Letter For Wage Increase . Your employer promised to raise your salary after you’ve completed your probationary period. Thank you for your attention to this matter. 50 Best Salary Increase Letters (How To Ask For A Raise?) ᐅ TemplateLab from templatelab.com If you have another amount in mind or a plan to increase my salary in the future, i am open. The salary increase letter confirms the details of the raise. Compose the body of the letter.