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
159 lines
4.1 KiB
TOML
159 lines
4.1 KiB
TOML
id = "depreciation-disposal-after-a-late-change-undone"
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title = "A disposal is taken once a late change to an earlier run is undone, on any later day"
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rule = "A disposal clears what the asset's runs carry now, so it waits until each run carries at the end of the disposal's month what it carries now. A reversal of an earlier run dated after that month is undone by reversing it, on any open day: the disposal month and the end are then right, and a later month end keeps the change and its correction as they were made."
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status = "CONVENTION"
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sources = ["ASC 360-10-35-4", "Pacioli 1494, ch. 31"]
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tags = ["depreciation", "disposal", "refusal", "reversal", "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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[[setup.accounts]]
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code = "7100"
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name = "Gain or Loss on Disposal"
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type = "revenue"
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# Asset X: 12,000.00, no salvage, 12 months from 2026-01-01 (1,000.00 a
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# month; December the 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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[[events]]
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run_depreciation = { asset = "X", period = "2026-01" }
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[[events]]
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run_depreciation = { asset = "X", period = "2026-02" }
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[[events]]
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run_depreciation = { asset = "X", period = "2026-03" }
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[[events]]
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run_depreciation = { asset = "X", period = "2026-04" }
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[[events]]
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run_depreciation = { asset = "X", period = "2026-05" }
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# May's run reversed on Aug 1 (doubted). Its month, and July's, still
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# carried it at their ends.
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[[events]]
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date = "2026-08-01"
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description = "Reverse event 7"
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reverses = 7
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# Disposed of 2026-06-15 for 7,000.00: refused. The disposal clears what
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# the runs carry now (January to April, 4,000.00) and would charge May
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# again at Jun 15, so June would end carrying 6,500.00 against a
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# schedule of 5,500.00. The refusal names May's run and the reversal.
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[[events]]
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date = "2026-06-15"
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dispose_asset = { asset = "X", proceeds = "7000.00", proceeds_account = "1000", gain_loss_account = "7100" }
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refused = "depreciation_past_disposal"
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# May was right: its reversal reversed on Sep 2 (August may be closed by
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# then; any open day undoes it).
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[[events]]
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date = "2026-09-02"
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description = "Reverse event 8"
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reverses = 8
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[[events]]
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date = "2026-06-15"
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dispose_asset = { asset = "X", proceeds = "7000.00", proceeds_account = "1000", gain_loss_account = "7100" }
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# Hand check (worked without the code): the runs carry 5,000.00 at Jun 30
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# and now. Held through Jun 15: 5,000.00 + 1,000.00 x 15/30 = 5,500.00, so
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# the final depreciation is 500.00 and the disposal clears 5,500.00. Book
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# value 6,500.00; gain 7,000.00 - 6,500.00 = 500.00. August's end carries
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# May's reversal (accumulated depreciation a 1,000.00 debit, the expense
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# 4,500.00) and September's its correction, as they would without the
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# disposal.
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[[expect]]
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query = "disposal"
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asset = "X"
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[expect.values]
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final_depreciation = "500.00"
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catch_up_depreciation = "0.00"
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excess_depreciation = "0.00"
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accumulated = "5500.00"
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book_value = "6500.00"
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gain_loss = "500.00"
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[[expect]]
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query = "balances"
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as_of = "2026-06-30"
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[expect.values]
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"1510" = "0.00"
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"6200" = "5500.00"
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"7100" = "500.00"
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[[expect]]
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query = "balances"
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as_of = "2026-08-31"
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[expect.values]
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"1510" = "1000.00"
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"6200" = "4500.00"
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[[expect]]
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query = "balances"
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as_of = "2026-09-30"
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[expect.values]
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"1510" = "0.00"
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"6200" = "5500.00"
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