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Old 25-08-2019, 12:08 AM   #6601
Junior Member
Join Date: Oct 2011
Posts: 81
There are often questions about using SCB vs IBKR, and what if buying monthly/bimonthly/quarterly... I tried to model the costs of the commonly discussed options in a spreadsheet -- no idea if it will make sense or be useful to anyone else, but here it is:

I'm sure someone will point out if there are any glaring errors

I did find it a bit surprising that while it makes sense to use IBKR over SC if you're intending to buy $700/mth of IWDA on monthly basis, SC is still cheaper up to $1800/mth on quarterly basis. I'm not sure how to weigh the value of clocking in more time-in-market, to decide between investing monthly over bimonthly or quarterly.

(You'll have to make a copy for yourself to plug in your favourite scenario. Click on File -> Make a copy.)
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