Here is the temperature can use to write a sample agreement letter for salary deduction.
Subject: Agreement for Salary Deduction
Dear [Recipient Name],
By this agreement made between [Your name] and [Recipient Name], the former agrees to respect the salary amount earned on or after the day [Date], which is the starting date of the agreement for the reduction of salary. [Your Name] will not be subject to any liabilities for any loss suffered by [Recipient Name].
This agreement is valid from [Date] to [Date] and is not irrevocable. However, it can be terminated by either party by giving at least 30 days’ written notice before the date of termination.