An ideal customer profile (ICP) describes the type of customer that gets the most value from your product and is cheapest for you to serve. For businesses it lists firm attributes: industry, size, budget, tools, and trigger events. For consumers it lists situation, budget, and the problem being solved.
An ICP is not a person. A buyer persona describes an individual, such as an office manager aged 34. An ICP describes the account or household you want: dental practices with three to eight treatment chairs, no in-house billing staff, still using paper appointment books.
Write it from data you have, not from wishes. Sort your existing customers by margin and by effort. A bookkeeping tool might find that clients with 5 to 20 employees pay 89 euros per month, stay 26 months, and open 1.2 support tickets per quarter. Clients with more than 100 employees pay 300 euros per month but stay 9 months and open 14 tickets per quarter. Lifetime revenue is 2,314 euros against 2,700 euros, while the support load is about twelve times higher. The smaller segment is the better ICP, even though it pays less per month.
Business plans place the ICP in the market and sales sections, before any estimate of how many customers exist. Foundor's generated plans put it ahead of the market size numbers, because the segment definition determines which market figure applies.
The most common error is writing an ICP that is too broad. "Small and medium businesses in Europe" excludes nobody and gives your marketing no filter. A usable ICP lets you look at a company and say no in ten seconds. The second error is treating the profile as permanent. Rewrite it after every 20 to 30 new customers; the profile that fits your first customers rarely fits your fiftieth.
