A sell annuity payments calculator is designed to estimate the lump sum amount you might receive if you sell your future annuity payments to a third party. The calculator approximates the present value of those future payments by inputting various details about your annuity, such as the payment amount, frequency, remaining term, and sometimes prevailing interest rates. This tool can help individuals considering selling their annuity payments to a company specializing in purchasing them. Still, it's worth noting that the actual offer may vary based on other factors and terms negotiated with the buyer.