Plant/Machinery Depreciation

This is the accumulated depreciation account for Plant and Machinery — a contra-asset account sitting alongside the original asset cost to show its accumulated loss in value. Unlike most asset accounts, it normally carries a credit balance, increased each year by the depreciation charge (posted as an expense to code 8001) and reducing the asset's net book value on the balance sheet without altering its original cost.

Real-world examples

Manufacturing (long-life fixed plant)

A manufacturer depreciates its CNC machinery over an expected 12-year useful life on a straight-line basis, giving a relatively low annual charge — say £6,700 a year — relative to the original cost. The entry is a debit of £6,700 to the depreciation charge code in Overheads & Depreciation and a credit of £6,700 to 0021 (Plant/Machinery Depreciation). There's no VAT anywhere in this entry: depreciation is a non-cash accounting adjustment, not a purchase.

Fast-wearing production equipment

A business running equipment under near-continuous multi-shift use — a bakery's production line, say — assumes a much shorter useful life, perhaps 5 years, or uses a reducing-balance method that front-loads the charge. The same mechanics apply (a debit to the depreciation charge code, a credit to 0021), but the annual charge as a proportion of original cost is noticeably higher than for equipment expected to last over a decade, reflecting genuinely faster wear rather than just a different accounting choice.

Commonly confused with

Code 0021 (Plant/Machinery Depreciation) is easy to mix up with code 0020 (Plant and Machinery). Code 0021 is the accumulated depreciation — a contra-asset that only ever moves at the year-end depreciation run — while 0020 is the original asset cost, which only changes when an asset of that type is actually bought or sold. Posting to the wrong one understates the asset's net book value without anyone noticing until the next audit.

What a mis-posting here costs you

Posting plant/machinery depreciation-related spend to the wrong Fixed Assets code doesn't change the total value of assets on the balance sheet, since it's still capitalised either way — but it does distort the fixed asset register and the depreciation schedule that runs off it, which is usually what alerts an accountant that something's misclassified at the year end.

Other codes in Fixed Assets