Accuracy / Rounding issues - Difference between gnucash and broker account

[Mike or Penny Novack]

On 1/27/2018 4:54 PM, Pawel Wocjan wrote:
> Hi,

> Are there some general guidelines how to choose accuracy for fractional shares/price etc? Has anybody experience such minor discrepancies between his/her broker account and gnucash?
>
> Thank you for your help,
> Pawel
>    
There is no way to do this (guarantee agreement). Whenever rounding is 
involved, it matters not just the particular rounding rule used but WHEN 
rounding is applied, because rounded(A) + rounded(B) does not 
necessarily = rounded (A+B).

One of the things I used to do (in my working days) was calculate the 
necessary "fuzz" for compare operations necessary not to have these 
small "errors" (different rounding process) cause mismatches.

Michael D Novack

PS: You can manually adjust by including a child account for "rounding 
errors" which you might name that or "fuzz".