You would first do a P&L for the present year for your existing business and the first year and as many years after as you would like to have your plan cover. Your existing business financials will be the foundation for building yourself a business plan for as many years out as you want. This data will tell you a number of things but first if you want to build your plan around what you want in life, you would need to decide some things about your life: 1. You would need to decide how much income you would like to have for yourself for each of the years you plan for. 2. You would need to determine what kind of profit margin you would want from your business for each of the years. 3. And by combining these 2 things into a P&L format you can develop a financial business plan that can extend as for into the future as you would like. 4. The first thing it will show you is how much sales you would need each year to give you the income and profit you would like. Once you see the sales needed, if you know your business well enough, you should be able to estimate those additional expenses needed to overcome capacity constraints that will occur as your business grows.
Contextualise Your Budget _ Of course your budget will be extremely important. But sometimes people sort of pluck figures out of thin air, not giving it the context it needs in the business plan to make real concrete sense of how that budget is going to work. So it is crucial that every time you mention financials in your business plan, to really give them the correct context. When I have worked with clients in developing business plans, there has been a budget or amount set aside for example to be spent on marketing, which has been decided a bit arbitrarily. I mean with no real research, no understanding of what that amount needs to be spent on, and what that budget will truly achieve. It seems to have been put there to fill the need to attribute a certain sum to marketing. Make sure you are researching each point of your budget, make sure that you are giving it context and it makes proper sense within your overall plan.