To manage inaccurate estimation in project budgets, consider the following best practices:

1. **Detailed Requirement Analysis**: Spend time gathering and analyzing detailed project requirements to create more accurate cost projections.
2. **Use of Historical Data**: Leverage data from previous similar projects to inform estimates. This can help identify potential pitfalls and adjust budgets accordingly.
3. **Engage Stakeholders**: Involve team members, stakeholders, and subject matter experts in the estimation process to gain varied perspectives and insights.