Cost is the counterpart to your revenue. They are caused by material and service use, as part of your operations.
A basic distinction exists between variable, fixed and mixed cost:
Adding the most important items, will help to bring clarity about what is needed to get your business up and running, thereby ensuring its survival. In contrast to the sales prediction, expense projections for your startup are relatively easy to plan. List all the positions and then determine their market value. If you work precisely, you can reverse calculate, how much (or if it is a fixed amount, at what price per piece) you need minimum to get a positive result. The keyword is break-even. You can find several examples of calculations on the internet. It is a bad idea to take the break-even as a basis for your sales forecast. But it is an important indication what goals you need to achieve in the medium term. If the result is unrealistic amounts and/or prices, then it is a clear message that you need to revise your business idea.
In SmartBusinessPlan you use the respective tables and assistants for calculating expenses (e.g. for employees, direct costs, operating costs etc.). The costs will then automatically be added up, divided and transferred to the profitability and liquidity planning.