HesapHanem

Double Declining Balance Calculator

Find DDB depreciation for any year of an asset.

How it is calculated

The tool applies a rate of twice the straight-line rate, rate = 2 ÷ useful life, to the book value at the start of the chosen year. That opening book value is cost × (1 − rate)year − 1. Then depreciation = opening book value × rate and closing book value = opening book value − depreciation. Cost is in dollars; useful life and year are in years. Cost must not be negative, useful life must be at least 2, and the year must be a whole number from 1 up to the useful life; anything else (year 0, year 2.5, year 6 of a 5-year asset, a life of 1) shows no result. This is a pure DDB formula: there is no salvage value field and no switch to straight-line near the end, so the book value never reaches zero. Tax rules for DDB differ by country.

Worked example

An asset costs 30,000 and has a 5-year useful life; you want year 2. The rate is 2 ÷ 5 = 40%. Year 1 depreciation is 30,000 × 40% = 12,000, which leaves an opening book value of 18,000 for year 2. Year 2 depreciation is 18,000 × 40% = 7,200. The tool prints $7,200.00 of depreciation and a closing book value of $10,800.00.

Try this example →

Common mistakes

  • Expecting a salvage value field. There is none, so the book value keeps falling toward zero and never stops at a residual amount. Compare the final-year figure with your own salvage value (year 5 here ends at $2,332.80).
  • Applying the rate to the original cost every year. DDB uses the declining book value, so year 2 depreciation (7,200) is smaller than year 1 (12,000).
  • Entering a useful life of 1 year. The doubled rate would be 200%, so the method needs a life of at least 2 years and the tool shows no result.
  • Asking for a year beyond the useful life, such as year 6 of a 5-year asset. The tool shows no result because depreciation has ended by then.
  • Entering a fractional year such as 2.5. The year must be a whole number, otherwise there is no result.

Sources

About this calculator

The double declining balance (DDB) method is an accelerated depreciation technique that front-loads an asset's expense: it takes the straight-line depreciation rate (1 divided by useful life) and doubles it, then applies that doubled rate to the asset's remaining book value each year rather than to its original cost. Because the rate is applied to a shrinking balance, depreciation is highest in the early years and tapers off later.

DDB is used for assets that genuinely lose most of their value early — vehicles, computers, and other fast-obsolescing equipment — and shows up in both financial reporting and tax depreciation schedules where accelerating deductions has a real cash-flow benefit. This calculator takes an asset's cost, useful life, and the year number you choose, and computes the DDB depreciation and the book value at the end of that year. It does not use a salvage value and does not switch to straight-line late in the asset's life, so if your schedule needs either, adjust the later years by hand.

Was this helpful?

You can pick up to 3 reactions.

Comments

  • Be the first to comment.

Popular calculators

Loan Calculator

Monthly payment, total interest and full amortization schedule.

Percentage Calculator

Percent change, percent of, and ratio calculations.

Discount Calculator

Calculate final price, savings, and discount amount.

BMI Calculator

Body mass index from height and weight (metric or imperial).

Age Calculator

Compute your exact age in years, months and days from a birth date.

Compound Interest Calculator

Calculate the final amount and interest earned with compounding.

All Calculators