Depreciation

Depreciation is the accounting process by which a business distributes the cost of a tangible fixed asset across the periods that asset is expected to generate revenue. Rather than recording the full purchase price as an expense in the year of purchase, the cost is spread over the asset's useful working life. This approach creates a more accurate picture of profitability and matches expenditure to the income those assets help produce. For businesses that own vehicles, equipment, or specialist tools, depreciation is a real cost that shows up in the P&L each year whether or not cash changes hands.

How Depreciation Works in Practice

Two methods are most widely used. The straight-line method divides the original cost equally across each year of the asset's useful life. A vehicle purchased for £20,000 with a 5-year useful life would be depreciated at £4,000 per year. This approach is predictable and straightforward, making it the most common choice for small to medium-sized businesses.

The reducing balance method applies a fixed percentage to the asset's remaining book value each year, front-loading the depreciation charge. A van worth £20,000 depreciated at 25% per year reduces to £15,000 after year one, then £11,250 after year two, and so on. This reflects the reality that many assets - especially vehicles and technology - lose value more rapidly in their early years.

Both methods are accepted under UK accounting practice (FRS 102). The right choice depends on how the asset actually loses value in your business. Straight-line suits assets that wear evenly over time; reducing balance suits assets where early obsolescence or market depreciation is significant.

Why It Matters for Business Owners

Depreciation affects three areas of your accounts. On the profit and loss account, the annual charge reduces operating profit. On the balance sheet, the accumulated depreciation account offsets the original asset cost to show the net book value. On disposal, any difference between sale proceeds and net book value creates a profit or loss on disposal that appears in the P&L.

For businesses that own significant physical assets - an AV hire company managing a fleet of cameras and audio equipment, a construction firm with owned plant and vehicles, or a renewables installer carrying specialist tools - depreciation is a meaningful cost that must be tracked accurately. Underestimating it leads to overstated profits and under-recovery of asset replacement costs over time.

Zigaflow does not manage depreciation schedules directly, but accurate job costing - including an allocation for asset wear - supports the kind of margin analysis that shows whether individual jobs are genuinely profitable after all real costs.