swaitsandClaude Opus 5.5
b0a9fd8ad4
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
99 lines
2.6 KiB
TOML
99 lines
2.6 KiB
TOML
id = "depreciation-final-month-drift"
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title = "The final month of a mid-month life takes what the months before it leave, evenly over its days"
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rule = "When a life does not start on the 1st, its final month is charged the depreciable amount less what the months before it took, spread evenly over the final month's days."
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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", "month-length-drift", "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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# Cost 1,030.00, salvage 100.00 (930.00 to depreciate), 3 months from
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# 2026-01-15: the life is 2026-01-15 through 2026-04-14.
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[[setup.assets]]
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id = "D"
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description = "Asset D"
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cost = "1030.00"
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salvage = "100.00"
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life_months = 3
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in_service = "2026-01-15"
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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 = "2026-01-15"
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description = "Capital"
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lines = [
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{ account = "1000", side = "debit", amount = "1030.00" },
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{ account = "3000", side = "credit", amount = "1030.00" },
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]
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[[events]]
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date = "2026-01-15"
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description = "Bought asset D"
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lines = [
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{ account = "1500", side = "debit", amount = "1030.00" },
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{ account = "1000", side = "credit", amount = "1030.00" },
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]
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# Hand check (worked without the code): 930.00 / 3 = 310.00 a month.
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# January holds 17 of its 31 days: 310.00 x 17/31 = 170.00. February and
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# March are whole: 310.00 each. Before April: 790.00. April holds 14 days
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# (1-14) and is charged what is left, 930.00 - 790.00 = 140.00, evenly:
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# 10.00 a day (January's own daily rate, 310.00/31). Through Apr 13:
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# 130.00; accumulated 920.00; book value 1,030.00 - 920.00 = 110.00.
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[[expect]]
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query = "depreciation_schedule"
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asset = "D"
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as_of = "2026-04-13"
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[expect.values]
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"2026-01" = "170.00"
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"2026-02" = "310.00"
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"2026-03" = "310.00"
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"2026-04" = "130.00"
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accumulated = "920.00"
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book_value = "110.00"
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# Through Apr 14, the life's last day: April 140.00, accumulated 930.00,
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# book value 100.00 (the salvage, never depreciated).
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[[expect]]
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query = "depreciation_schedule"
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asset = "D"
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as_of = "2026-04-14"
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[expect.values]
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"2026-04" = "140.00"
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accumulated = "930.00"
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book_value = "100.00"
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