USF is a tax on interstate phone services.

If you charge for intrastate and interstate services separately, you can tax 
the interstate charges at the USF rate.  If you do not, and you can determine 
the percentage of minutes that are interstate vs intrastate, you can charge USF 
on that percentage of the total charge.  There are some reporting requirements 
if you are doing this.  Otherwise, you can use the Safe Harbor amount which 
assumes that 64.9% of the bundles interstate+intrastate charge is interstate 
and charge USF on that.

Example:

$25 VoIP Bundle
64.9% = Interstate = $14.40 Interstate
$14.40 x USF (presently 17.1%) = $2.46 USF due

Dave


> On Aug 5, 2015, at 10:12 AM, Simon Westlake 
> <[email protected]> wrote:
> 
> I seem to vaguely remember someone once telling me it is calculated as a 
> percentage of the tax that you assess your customer, but that doesn't seem 
> right to me. Googling has proved fruitless. Anyone here collect USF and, if 
> so, how do you calculate it? Or even if you don't collect USF but know how it 
> should be done, that'll work too!


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