Why it has to stay fixed
If the budget changes every time an account runs over, variance disappears and nobody can tell whether the film is on track. Locking the budget gives the cost report a fixed reference point. The same logic as a locked script: after the lock, changes are tracked as revisions.
How changes are recorded
Say the budget was locked as version 7 on March 2. In week 2 of shooting, the director adds a night exterior that needs a condor, two extra electricians, and a location fee. The producer approves $18,500 from contingency. The camera department also comes in $4,000 under on lenses, and the UPM moves that to grip.
| Acct | Description | Locked (v7) | Transfers | Approved changes | Current budget |
|---|---|---|---|---|---|
| 3300 | Camera | $118,000 | ($4,000) | $114,000 | |
| 3400 | Grip | $41,000 | $4,000 | $45,000 | |
| 3500 | Electric | $52,000 | $9,200 | $61,200 | |
| 3600 | Locations | $64,000 | $9,300 | $73,300 | |
| 9800 | Contingency | $75,000 | ($18,500) | $56,500 |
The approved changes sum to zero across accounts: $9,200 + $9,300 - $18,500 = $0. The locked total is unchanged, and the report shows exactly where contingency went and why.
Getting to a lock
- Final shooting schedule, since days drive most costs.
- Deals closed or priced for all above-the-line and department heads.
- Fringe rates confirmed with the payroll company.
- Insurance and bond quotes in hand.
- Review by the financier or completion bond guarantor, whose notes often add days or money.
- Version number and date on the top sheet, signed off by the producer.
How a lock gets broken
Continuing to edit the budget file after the lock and overwriting v7, so the original is lost. Locking a budget built on an old schedule. And moving money between accounts without any record, which a guarantor or tax credit auditor will find. The production accountant should keep the locked version as a read-only file and build every report from it.
