Thanks for reaching out to the Community forum, marion-grant-liv.
The expenses showing on your QuickBooks Self-Employed (QBSE) account depends on how you categorize your transactions.
To isolate why your expenses are only £400 for the year, let's check how your transactions are categorized. Here's how:
In the left menu, click Transactions.
Click the Type: All drop-down menu.
Under the Business section, select Spending.
You can also run the Business and personal expenses report to see a list of all your expenses broken down by category. Follow the below steps to run the report:
In the left menu, click Reports.
Locate the Business and personal expenses report.
Set the year.
Click the View link.
From there, you'll see all your expense transactions.