The issue here is that my client set up VAT themselves within Quickbooks and set it to use the cash basis. They are not eligible for the cash basis so, on finding this out, I have changed it to the accruals basis. There are, as a result, adjusting entries on the return. All well and good so far.
Now Quickbooks does helpfully calculate these adjusting entries, which is great. However, the entries show up as a single total on the return generated. I don't trust that total is correct, not as a result of any problem with Quickbooks, but because I expect there's other things lurking about in Quickbooks that might also have fallen in there despite not being relevant to this return, such as unreconciled items from before Quickbooks was being used for VAT and the like.
What I would really like is to see what transactions Quickbooks thinks need adjusting for on the return, however this isn't possible. I've been on with support for two hours today who have confirmed it isn't possible, the best they can offer is the suggestion to generate one report under the cash basis and another under the accruals basis and the differences between the two are the reconciling items. Fair enough, that's achievable and I'll do it, shame it took two hours to get that answer.
However, it occurs to me that this is absolutely not a digital link from the Box 1 and Box 4 totals all the way back to the transaction level data. It falls over at the first step below the return and if you want to know where the figures in that report come from, you then have to change the settings, export the data, change them back and then manually compare the results.
That is, to my mind, definitely not compliant with MTD, what do you think?