depreciation adjusting entry

When a business buys a delivery van for 30,000, it does not use up the van all at once — it wears it out slowly over years of driving. Charging the whole 30,000 as an expense the day it is bought would crush that year's profit and make later years look artificially good, even though the van keeps working. The depreciation adjusting entry is how accounting spreads the cost of a long-lived asset across the periods that actually benefit from it.

Mechanically, depreciation is a special kind of deferral: the asset's cost was paid up front and is consumed gradually. Each period an adjusting entry debits Depreciation Expense and credits Accumulated Depreciation, a contra-asset account that builds up against the asset. If the 30,000 van is expected to last five years with no salvage value, straight-line depreciation is 6,000 a year, so each year you debit Depreciation Expense 6,000 and credit Accumulated Depreciation 6,000. The van stays on the books at its original 30,000, while accumulated depreciation grows; the difference, called book value or carrying amount, falls from 30,000 toward zero.

Depreciation is one of the most important adjusting entries because almost every business owns long-lived equipment, buildings, or vehicles. A crucial point to grasp is that depreciation is not a cash outflow and not an attempt to track market value: the van might be worth more or less than its book value on any given day. Depreciation is simply a systematic allocation of an already-paid cost, which is why it can lower reported profit without touching the bank balance at all.