swaitsandClaude Opus 5.5
aa884d35d1
The final month takes what the months before leave, spread over its days; a disposed asset stops on its disposal day. A skipped month is caught up in the month the run is made; a reversed run un-posts its month. New schedules spread by day; equal-months schedules must start on the 1st. Amounts round to the currency's own minor unit. Kani and Lean proofs; an exhaustive search over runs, reversals and disposals. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01T3gXMVt7XJPi6ens1or9Dj
94 lines
2.3 KiB
TOML
94 lines
2.3 KiB
TOML
id = "depreciation-final-month-by-days"
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title = "Straight-line depreciation by the day through the life's final month"
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rule = "Depreciation through a day of an asset's final month is the depreciation before that month plus the final month's share for the days held, never the whole remaining cost."
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status = "CONVENTION"
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sources = ["ASC 360-10-35-4"]
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tags = ["depreciation", "straight-line", "final-month", "p3-defect-22"]
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[setup]
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currency = "USD"
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fiscal_year_start = "01-01"
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basis = "accrual"
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rounding = "half-away-from-zero"
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[[setup.accounts]]
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code = "1000"
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name = "Bank"
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type = "asset"
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[[setup.accounts]]
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code = "1500"
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name = "Equipment"
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type = "asset"
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[[setup.accounts]]
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code = "1510"
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name = "Accumulated Depreciation"
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type = "asset"
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[[setup.accounts]]
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code = "3000"
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name = "Capital"
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type = "equity"
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[[setup.accounts]]
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code = "6200"
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name = "Depreciation Expense"
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type = "expense"
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# Asset X: 12,000.00, no salvage, 12 months from 2026-01-01. Its life is
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# 2026-01-01 through 2026-12-31; December is its final month.
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[[setup.assets]]
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id = "X"
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description = "Asset X"
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cost = "12000.00"
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salvage = "0.00"
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life_months = 12
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in_service = "2026-01-01"
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method = "straight_line"
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cost_account = "1500"
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accumulated_account = "1510"
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expense_account = "6200"
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[[events]]
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date = "2026-01-01"
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description = "Capital"
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lines = [
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{ account = "1000", side = "debit", amount = "12000.00" },
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{ account = "3000", side = "credit", amount = "12000.00" },
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]
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[[events]]
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date = "2026-01-01"
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description = "Bought asset X"
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lines = [
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{ account = "1500", side = "debit", amount = "12000.00" },
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{ account = "1000", side = "credit", amount = "12000.00" },
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]
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# Hand check (worked without the code): 12,000.00 / 12 = 1,000.00 a month.
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# Through Dec 15: January..November, 11 x 1,000.00 = 11,000.00, plus
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# December's 1,000.00 x 15/31 = 483.870... -> 483.87 (half away from zero).
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# Accumulated 11,483.87; book value 12,000.00 - 11,483.87 = 516.13.
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[[expect]]
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query = "depreciation_schedule"
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asset = "X"
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as_of = "2026-12-15"
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[expect.values]
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"2026-11" = "1000.00"
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"2026-12" = "483.87"
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accumulated = "11483.87"
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book_value = "516.13"
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# Hand check: through the life's last day, the whole of it.
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[[expect]]
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query = "depreciation_schedule"
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asset = "X"
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as_of = "2026-12-31"
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[expect.values]
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"2026-12" = "1000.00"
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accumulated = "12000.00"
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book_value = "0.00"
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