Contra asset
AccountingA credit balance that sits against an asset and reduces it, rather than being presented as a liability.
Also written: contra account, accumulated depreciation, allowance account
Accumulated depreciation is the standard example. It is not money the company owes anyone, so it is not a liability. It is the running total of cost already charged against a fixed asset, presented as a deduction from that asset so the balance sheet can show gross cost, the accumulated charge, and the net carrying amount separately.
The same structure appears elsewhere. An allowance for expected credit losses sits against receivables, and accumulated amortisation sits against intangibles. In each case the contra account preserves information that a single net figure would destroy.
That preserved information is genuinely useful. Gross cost against accumulated depreciation tells you roughly how far through its life the asset base is, and a fleet that is 85% depreciated is a capital expenditure problem arriving shortly whether or not the profit and loss shows any sign of it.
It also explains a mechanical point in the walkthrough. When depreciation is recorded, no liability appears anywhere. The asset side falls, equity falls through retained earnings, and the balance sheet balances without a liability being involved, which is a common source of confusion for anyone expecting every entry to have a liability side.
Worked example
Gross PP&E of 1,000 with accumulated depreciation of 400 gives a carrying amount of 600.
Two companies both report 600 of net PP&E. The one carrying 1,000 gross against 400 of accumulated depreciation is far earlier in its asset cycle than the one carrying 3,000 gross against 2,400, and the net figure alone hides that completely.