How detailed does a business plan need to be?

“Long run is a misleading guide to current affairs. In the long run we are all dead.” - John Maynard Keynes (1883-1946), British economist.

The amount of detail in a business plan depends on what the plan is for and how much is at stake.

If you are starting a part-time business that will only take a few hundred dollars and you don’t EXPECT it to become more then a glorified hobby then a short plan will do, a page or two.

If you are going to spend a significant amount of money, want this to be your full time business and you NEED the income from it then you need a full and detailed plan.