7. Add fixed costs for tasks

Besides the costs with resources, a task may have other costs that do not depend on its duration. Introduce it in the Fixed cost column and set an accrual method in Accrual column: start/end if the cost is incurred at start/end of the task and prorated if the cost is distributed proportionally with task duration.

In the Task Sheet view that appeared on the right pane, you can see the tasks cost distribution in time.

If you have financial constraints related to the cash-flow maximum values, you can move or link tasks, delay tasks using a lag time, or simply redistribute resources, considering that the costs distribution is related to the resources distribution over time.