Prestashop Tax Rounding in the Opposite Direction (USA/WI)?

[bitwiz]

An invoice totals: $194.25

Tax based on customer zipcode = 5.5% (WI State @ 5.0% combined with WI Dane County @ 0.5%) Correct

Actual Math = 194.25 * 0.055 = 10.68375

Prestashop Tax = $10.69 (rounded up?) INCORRECT

Our company's POS System calculation = $10.68 (rounded down) Correct

 

Then also, a second example:

 

An invoice with total: $257.25

Tax based on customer zipcode = 5.6% (WI State = 5.0%, Milwaukee County = 0.6%) Correct

Actual Math = 257.25 * 0.056 = 14.406

Prestashop tax = $14.40 (this time it rounded down???) INCORRECT

Our company's POS system calculation = $14.41 Correct

 

Prestashop Version 1.6.1.9

We're using the "recommended" rounding to round up when half way.

Tax rules are set to combine.

A 25% off voucher has been applied to these invoices.

Removing the voucher has no effect. The tax is still incorrectly rounded.

Invoices that come out to 2 decimal places or less in tax amount work correctly (no rounding involved).

I've also checked for PHP updates and updated to the latest PHP 5.6 on the server today.

Upgraded to Prestashop 1.6.1.10 - problem persists.

Edited December 2, 2016 by bitwiz (see edit history)

[bitwiz]

The one transaction that went through over the weekend after the update that had tax applied rounded correctly. Perhaps there was a caching issue after the update was installed. I will post back if it is still a problem.

Edited December 5, 2016 by bitwiz (see edit history)