Thanks for your reply Basara,

Thanks for the information about the FedEx extension, unfortunately, we do not use FedEx as a shipping option.

I installed the weight-based delivery extension however it added a third weight-based shipping option to the orders and it did not add tare weight and packaging cost to the USPS and UPS shipping extensions. Although the weight-based delivery extension did not do what I wanted, I appreciate your suggestion and I am glad that I tried it.

Does anyone know how to add to or edit the code to add package weight (additional weight) and packaging cost (additional cost) to the USPS extension and UPS extension shipping rates?

Hello,
Yes, in the shipping extension settings, I had selected the Tax Class.
The issue was caused by the taxes calculation order being set to the same number as the shipping calculation order in the order totals extension. This resulted in the shipping cost not being included in the taxes.
When I changed the taxes calculation order to a higher number than the shipping calculation order, it then started working and the sub-total plus shipping were both included in the taxes.
It is working perfectly now.

I figured out why the shipping cost was not adding to the sales tax and now have that issue resolved.

On the Order Totals extension, the Taxes row Calculation Order column was set to 3 which was the same that the Shipping row was set to. I changed it to 5 and now the shipping cost is adding to the sales tax.

I attached an image with screenshots of the Order Totals extension and checkout page showing it now working.

Thanks for your reply. I agree it is usual for shipping methods to be sorted from low to high prices.

The USPS and UPS shipping extensions that are included with AbanteCart version 1.3.4 do not sort shipping methods by low to high prices. They appear to sort shipping methods in ascending order according to the number at the end of their label's "for" attribute.

For example, with the UPS extension, the top shipping method is UPS Next Day Air which has a "for" attribute of "default_ups01default_ups.01". The second down shipping method is UPS Second Day Air which has a "for" attribute of "default_ups01default_ups.02". The third down shipping method is UPS Ground which has a "for" attribute of "default_ups01default_ups.03". Etc.

It is the same with the USPS extension, with the shipping methods being sorted in ascending order according to the number at the end of their label's "for" attribute.

For these UPS and USPS extensions, there is no option to change the sort order in the admin area.

I attached a screenshot showing how the shipping options are sorted.

Thanks a lot for your help with that. I got it fixed in less than a minute using the code corrections at the link you provided, and it is working perfectly now.