To effectively manage inaccurate estimates in project budgeting, consider these best practices:

1. **Use Historical Data**: Leverage data from previous projects to inform estimates. Analyze past performance to better predict costs and timelines.

2. **Break Down Tasks**: Decompose the project into smaller, more manageable tasks. This granular approach allows for more accurate forecasting of resources and costs.

3. **Employ Expert Judgment**: Involve experienced team members or industry experts to provide insights and input on estimates, which can lead to more realistic projections.

4. **Utilize Estimation Techniques**: Implement various estimation techniques, such as Analogous Estimating, Parametric Estimating, and Three-Point Estimating, to determine costs more accurately.

5. **Include Contingency Allowances**: Build in contingency reserves for unforeseen circumstances. This can help buffer against inaccuracies in initial estimates.

6. **Iterative Estimation**: Use an iterative approach to refine estimates over time. This can involve revisiting estimates at key milestones or phases of the project.

7. **Engage Stakeholders**: Involve stakeholders in the estimation process to gain different perspectives and identify potential issues early on.

8. **Create a Detailed Work Breakdown Structure (WBS)**: A well-defined WBS helps clarify scope and detail requirements, leading to more accurate estimates.

9. **Regularly Update Estimates**: Continuously review and adjust estimates as the project evolves, based on new information or changes in scope.

10. **Document Assumptions**: Clearly document assumptions made during the estimation process, so that they can be revisited or validated as the project progresses.

Implementing these best practices can significantly reduce the incidence of inaccurate estimates, ensuring better budget control and overall project success.