Temporary Offer Guidance

As someone who primarily specializes in permanent recruitment, I’m navigating a situation where a client can only offer a day rate or contract for a vacancy.

The client is eager to make an offer and is asking for the candidate’s desired rate.

When communicating this to the client, should I already include my desired margin percentage? For instance, if the candidate is looking for £500 per day and I require a 20% margin, should I present the candidate’s expectation as £600 per day?

Also, do I need to clarify that this figure includes my fees, or should I simply state the £600 per day without further context?

Is a 20% margin considered too high? Have others experienced clients withdrawing offers due to perceived excessive margin fees?