If you run your P&L report and notice that it's missing budget data, first make sure that the budget record is specified as Reporting Budget:
Then, before you run the P&L report, click Customize and examine the Calendar parameter to be sure it's set to Operational:
If you run the report for your fiscal calendar, budget data won't display even if you've marked it as a reporting budget.
For more information on budgets, see our "Budgeting" category.
For more information on the P&L report, see "Profit and Loss".