Adam, this website might be of some use....just not sure. It is the CEFA website. For each CEF it shows both an 'Income Only Yield' and a 'Distribution Yield (Market)'.
I am not sure what effect capital gains would have. Nor am I sure if someone can really get a handle on whether or not the principal is being returned to you in the monthly dividend payouts just by looking at this website.
I could be wrong, but I believe that the ETFConnect website only shows the current distribution rate and does not break out the Income Only Yield from the total distribution.
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