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As far as 1st, 2nd and 3rd year estimates, I can only make some general and obvious points.
1.) If it's an
existing business you're buying, its easy, the prior owner can help you figure your expense increases and potential profit margins.
2.) If it's a
new business, sales will increase year to year for the first few years, at much higher rates, then start to come down to a reasonable annual increase.
3.) A new small business, just starting out, could experience this trend:
1st yr sales $100,000
2nd yr sales $120,000 (20% increase from first year)
3rd yr sales $132,000 (10% increase from 2nd year)
4th yr sales $142,000 (8% increase from 3rd year)
After that, it's reasonable to assume that your annual gross sales should eventually come down to just above inflation, say 5% or so.
Once you've settled in your niche and have established your customer base, sales will stabilize to a more reasonable level. Every business is different though and the above is only an example of potential annual gross sales for the first 4 years, just to give you an idea. If your business was less stable, a tech business for example, things could be much more difficult to predict.
The costs of running a business is another animal altogether.
You'd have to factor in annual increases of: rent, utilities, advertising, salaries, ingredients, materials, equipment & supplies, etc.