This thread caught my attention as I have invested in mutual funds that invest, primarily, in Master Limited Partnerships where all dividends are a Return of Capital.Due to long-standing bug in the Return of Capital transaction logic both Quicken Premier and Quicken for Mac calculate the change in cost basis incorrectly and apply the changes to the wrong lots.I discovered this after splitting a Reinvest Dividend transaction into separate Return of Capital and Buy transactions. The problem is that the Return of Capital transactions uses the total number of shares held at the end of the day that the Return of Capital transaction is recorded.Let's say that you received a dividend of $50.00 based on your owning 500 shares of a security and the dividend was reinvested and you acquired 10 additional shares. The Quicken Return of Capital transaction will divide the $50.00 by 510 shares to calculate the per share adjustment of $0.098039.This adjustment factor will be multiplied by the number of shares in each lot and subtracted from the lots cost basis.I'm sure you see the fundamental flaw in the logic. The dividend that was classified as a Return of Capital was earned on the shares held prior to the dividend distribution. The per share adjustment should have been calculated to be $0.10 ($50.00 / 500).Also, the 10 shares acquired with the dividend should have their cost basis set to $50.00 instead of the $49.01961 calculated by the current Return of Capital transaction logic.As Quicken hasn't gotten around to correcting the logic error, the user needs to record the Return of Capital the day before it was received.