Could someone help explain why my monthly expenses/payments towards my long term liability (van on personal loan) are not shown under expenses on my income tax report?

You've come to the right place, Sophie.

I'll help you get the data you need for your report.

Which expense category did you use? Is it an allowable expense?

Furthermore, I'm adding this resource for your reference. This can guide you in efficiently filing your returns: Submit a MTD for VAT return to HMRC in QuickBooks Online

I'll be here to help you further we just need a bit more detail as mentioned. Keep safe!