Couple the prospect of higher interest rates with a flattening yield curve in recent weeks, and AGNC has a recipe for shrinking book value. AGNC has averaged a double-digit yield in 12 of the past 13 years, making it an ideal source of monthly income, and a solid way to outpace high inflation. AGNC Investment Corp.: $106,300 initial investment needed (11.29% yield) First up is arguably the most well-known monthly dividend payer with an ultra-high yield, AGNC Investment Corp. (NASDAQ: AGNC).