Ignore capital budgets as they are unreliable, and all projects run over budget.

Prepare a detailed capital budget so actual expenditure can be tracked against the plan and adjustments made if necessary.

Charge the cost of new capital equipment against the operating budget because the capital budget is constrained, and your appraisal rating will look better if you remain within your planned capital budget.

Include a reasonable contingency allowance in the capital budget for a new project to cover unknown costs and issues.