Passed-on costs

Hello everyone,

I am a solicitor and work for a law firm. Certain costs specific to my business are paid by the firm, including bar association fees and suchlike. I pay these costs first and then invoice the firm for them.

My invoice to the firm then amounts to my invoiced services + the passed-on costs.

My question: should I book the full invoice amount (invoiced services + passed-on costs) as revenue and then book the passed-on costs incurred as expenses? Or should this be booked in an other way?

Thanks in advance!