How do I actually use an ICP to turn briefs down?

I've got an ICP on the wall but we still take every brief that lands

An ICP only works if it has teeth, a written rule that lets you say no. Define your right-fit client tightly enough that some real briefs fail it, then agree as a team that failing it means walking away. An ICP that never costs you a deal isn't an ICP, it's a poster.

The Long Answer

Almost every agency has an ICP and almost none of them use it, because the version on the wall is aspirational rather than operational. A real ICP is a filter you're willing to lose money to honour. Write down the three or four things that make a client genuinely right for you: sector, size, budget, the kind of work, how they buy, how they treat suppliers.

Now stress-test it against the last ten briefs you accepted. If all ten pass, your ICP is too loose to be useful. The point is to make some real, tempting briefs fail. Then comes the hard part, the team agreement that a failing brief gets declined or referred on, even when the pipeline looks thin and saying yes would feel safer.

This is where founders flinch, because turning down revenue feels reckless when cash is tight. It isn't. Wrong-fit clients are the most expensive mistake at every stage: they over-service, they pay late, they bruise the team, and they crowd out the right-fit work you'd actually be brilliant at.

The ICP is how you protect margin and morale at the same time. Give it teeth or take it off the wall.