I am looking for a calculator to compare taking money out monthly or yearly.  

Example.  $100,000 at 5% for 20 years annuity.   

(1)  I can take X  amount per month 

OR 

(2)  I can take the same X annually amount Jan 1 of each year.  

Taking money monthly should make the payments bigger or make the $100,000 last longer.    Yes ? 

The question is how much more will I have for income if I take monthly instead of yearly payments.  

Forget about my current tax rate or my other incomes.  

If you can't give me a web site with a calculator maybe you could just show your results.