Hi there Sylvie44,

Thanks for reaching out about tax on your transactions. QuickBooks Desktop is a great tool able to keep track of tax on sales and expense transactions so you know the amounts for your next filing. I can point you in the right direction for assistance with entering tax on billable expenses.

For assistance with how your transactions should be entered so that the tax is affected correctly. I recommend reaching out to the QuickBooks Desktop support team. They'll be able to view how you've created this transaction so that both the part for your supplier and the one for your customer are taxed correctly. You can reach them using the methods outlined in the QuickBooks Desktop Support Policies.

If you have any other questions, feel free to reach out here.