Well, we can now publish group rates with at least four parts. But unfortunately the transaction often gets to QBO with the wrong total, off by a cent or two. I assume that's a rounding issue. Dext pushes things over as Exclusive of Tax. If you did Inclusive of Tax, I think the group rate total would be right.

allow up to 3 tax codes in the linking to qbo

Please fix the error "The 'Invalid Tax Rate - Invalid Tax Rate : Invalid tax rate id - 35" and allow for more than two tax rates to be assigned to a single tax code in QBO.

It would be great if Dext would allow publishing with more than 2 tax rates. For example, we have set up a group rate in QBO, which comprises of 4 tax rates: 2.5% federal and 2.5% federal-non tracking, and 6.56 % provincial and 1.44% provincial-non tracking. Currently, the only workaround to this is by selecting HST ON in Dext when publishing, then manually editing it in QBO.

I agree with Jennifer Lee
Hubdoc is able to handle PSB tax rates, so I know it can be done.

I want to be able to use tax rates that have more than two lines. In QBO, I have tax codes set up for the Public Service Bodies Rebate, and they have 4 lines in them (for the refundable part of each of PST/GST, and the non-refundable part of both as well). I currently can't use that tax rate from Dext. I have to push over the bill, then go into QBO and choose the PSB tax rate there instead. Hubdoc is able to handle PSB tax rates, so I know it can be done.