Landfill Closure & Post-Closure Costs - GASB 18 Liability Accrual
Accruing the closure and post-closure care liability for a government-owned municipal solid waste landfill based on the capacity used to date relative to total capacity.
| Account Name | Type | Debit ($) | Credit ($) |
|---|---|---|---|
| Landfill Closure & Post-Closure Care Expense | Expense (+) | 485,000.00 | - |
| Landfill Closure & Post-Closure Care Liability | Liability (+) | - | 485,000.00 |
💡 Accountant's Note
GASB 18 requires governments operating municipal solid waste landfills to accrue estimated closure and post-closure care costs based on the portion of landfill capacity used to date. If the landfill is 40% full, 40% of total estimated closure costs are accrued. Closure costs include: installing the final cover, monitoring systems, and leachate collection. Post-closure costs include: 30-year EPA-required monitoring, groundwater testing, methane monitoring, and maintenance. These are massive long-term liabilities — closure and post-closure can cost $5M–$50M+ for large facilities.
Practitioner & Systems Framework
💻 ERP Architecture
The accrual rate changes annually as more capacity is used. Obtain an annual engineering estimate of total closure and post-closure costs in current dollars. Recalculate the accrual percentage (used capacity / total capacity) and update the liability. Track the liability separately from other long-term liabilities in the notes.
⚠️ Audit Flags
GASB 18 is frequently underimplemented — many governments operating landfills either don't accrue the liability at all or use outdated engineering estimates. Auditors require a current engineering study supporting the cost estimates. EPA compliance status of the landfill is reviewed — non-compliant landfills have higher estimated costs.
📄 Required Documentation
Landfill capacity determination (total design capacity, used capacity), current engineering estimate of closure and post-closure costs, EPA post-closure care permit, state environmental regulatory correspondence, GASB 18 accrual calculation, note disclosure with key assumptions.
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