Dictionary / Adjusted Historical Cost
What does Adjusted Historical Cost mean in accounting?
Quick definition
GeneralHistorical cost raised to current cost by means of a price index or series of price indexes. This term guides how bookkeepers record, classify, and explain related transactions in routine financial reporting.
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Examples
A price index restates the 2018 CNC
On June 3, 2018 your sign shop bought a CNC from a machinery dealer for $41,500. In March 2026 a departing partner wants current-dollar cost on the equipment list, so you apply the metalworking-machinery price index (2018 = 100, now 119) and get $49,385. That $49,385 is adjusted historical cost: historical cost raised by an index, not an auction bid. Leave the fixed assets line at $41,500 in QuickBooks Online or Xero, and put $49,385 on the buyout worksheet only.
A dealer listing is not the index
On May 19, 2021 your florist bought a refrigerated delivery van from a van dealer for $28,400. In August 2026 a dealer lists similar vans at $34,000; that listing is fair value, not adjusted historical cost. Adjusted historical cost would take the $28,400 and apply a vehicle price index; it is not the lot price. At the August 31 close, leave the van at $28,400 original cost on the balance sheet. If you journal the asset up to $34,000, you invent $5,600 of equity and mix a market quote with an index restatement.
Why it matters
Adjusted historical cost is historical cost restated to current dollars with a published price index, not a market quote and not a new invoice. You will not post this most months; it almost never belongs on everyday QuickBooks Online or Xero books, and it shows up only when someone restates old equipment or a building for an insurance worksheet, a partner memo, or inflation-adjusted supplemental statements. Leave the asset at original cost on the balance sheet; journal the index-raised figure into the asset account and you invent equity and mix a restatement with fair value. Depreciation and tax cost basis still start from what you paid.
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What is Adjusted Historical Cost in bookkeeping?
Historical cost raised to current cost by means of a price index or series of price indexes.
When should I use Adjusted Historical Cost?
Use Adjusted Historical Cost when the transaction facts match its definition and you need the ledger and financial statements to reflect the correct account and period.
What is a common mistake with Adjusted Historical Cost?
Adjusted Historical Cost is used for adjusted historical cost entries, while Abandonment covers a related but distinct bookkeeping purpose. Review both terms before posting unusual transactions. A common mistake is applying it by label only instead of checking the underlying transaction details.