If you receive Social Security benefits, there's an important letter coming to you in the mail this month. The Social Security Administration is sending out letters throughout December with information on beneficiaries' cost of living adjustment coming in January. Don't throw out the letter and don't lose it. You may need it for a number of reasons, including proof of benefit amount when applying for loans or energy assistance. So keep that letter in a safe place. The letter notifies beneficiaries of their new 2023 benefit amount, according to the SSA, which will increase by 8.7% in January. Those who...