Does Double Declining Balance Use Salvage Value?

Double declining balance depreciation does not use salvage value in its annual formula. The DDB rate is applied to the asset’s beginning book value each year without first subtracting any estimated residual worth. Salvage value only matters as a stopping point: under financial reporting rules, depreciation ends once book value reaches the salvage estimate. Under MACRS for federal tax purposes, salvage value is ignored entirely and treated as zero.¹

How the Annual DDB Calculation Actually Works

Straight-line depreciation subtracts salvage value from cost before dividing by useful life. DDB skips that subtraction. You take the straight-line rate (1 divided by useful life), double it, and multiply that fixed rate against the beginning book value each year.²

The cost basis you start with includes the purchase price plus everything you paid to get the asset in service: sales tax, shipping, installation.³ Salvage value is not deducted from that basis.

Take a $100,000 asset with a five-year useful life and a $10,000 salvage estimate. The straight-line rate is 20%, so DDB uses 40%. The schedule looks like this:

Year 1: $100,000 × 40% = $40,000 depreciation; book value $60,000
Year 2: $60,000 × 40% = $24,000; book value $36,000
Year 3: $36,000 × 40% = $14,400; book value $21,600
Year 4: $21,600 × 40% = $8,640; book value $12,960
Year 5: $2,960 (capped at salvage); book value $10,000

Notice what the $10,000 salvage value did in years one through four: nothing. It never entered the multiplication. That is what makes DDB “accelerated” compared with straight-line — you are depreciating a larger base early because salvage has not been carved out yet.

Salvage Value as the Floor, Not the Formula

Under GAAP, an asset’s book value cannot fall below its estimated salvage value. At the end of the useful life, net book value should equal salvage, and depreciation stops there.⁴ Total lifetime depreciation therefore equals cost minus salvage, the same lifetime total straight-line would produce. DDB just front-loads it.

IRS regulations under Section 167 frame non-MACRS property the same way: accumulated depreciation plus salvage value should equal the asset’s original cost by the end of its useful life.⁵ Overstating depreciation past that boundary can draw an accuracy-related penalty of 20% of the resulting tax underpayment.⁶

So salvage plays no role in the year-by-year math, but it sets the outer limit on how much you can ever depreciate. The finish line, not part of the race.

The Final-Year Plug Entry

In the last year, the standard 40% (or whatever the doubled rate is) almost always produces a number that would push book value below salvage. When that happens, you record only the difference between current book value and salvage value instead. In the example above, book value entering year five was $12,960 and salvage was $10,000, so the final entry is $2,960 regardless of what the 40% rate would have produced.

Accountants sometimes call this the “plug” because it fills the gap. After that entry, no more depreciation can be claimed on the asset. Recording the full formula amount in the final year would drop book value below salvage, understate the asset on the balance sheet, and overstate expense on the income statement.

MACRS Treats Salvage Value as Zero

Everything above assumes financial reporting or older Section 167 depreciation. Federal tax depreciation works differently and, on this specific point, more simply.

Under the Modified Accelerated Cost Recovery System, which covers most tangible business property placed in service after 1986, the statute states plainly that “salvage value shall be treated as zero.”¹ IRS Publication 946 says the same in its glossary: salvage value is “not used under MACRS.”²

That means salvage plays no part in MACRS at all: not in the rate, not in the annual calculation, and not as a floor. The entire cost of the asset is recovered through depreciation over the applicable recovery period, which is five years for vehicles and computers and seven years for office furniture, among others.²

The practical result is that the same asset produces different depreciation numbers on the books than on the tax return. If you are running DDB for a tax return under MACRS, you can ignore salvage value completely because the system already assumes it is zero. If you are running DDB for GAAP financial statements, salvage is where depreciation stops. Many businesses maintain two depreciation schedules for this reason.

One boundary worth noting on the tax side: switching an actual depreciation method for existing assets on a tax return is not the same as adjusting an estimate. A method change generally requires filing Form 3115 and following the accounting method change procedures.⁷

When Your Salvage Estimate Turns Out Wrong

Salvage value is an estimate at the time an asset is placed in service, and estimates change. Under GAAP, a revised salvage value is treated as a change in accounting estimate and applied prospectively. You do not restate prior years.

Say you originally pegged salvage at $10,000 on a $100,000 machine, and after three years of DDB the book value is $21,600. If you now think salvage will be $5,000 instead, you do not go back and redo years one through three. You take the current $21,600 book value, subtract the new $5,000 salvage, and spread the remaining depreciable base over whatever useful life is left. The same prospective treatment applies to changes in useful life.

Under MACRS, this question rarely arises because salvage is already zero and does not need revising.¹ The book-side revision is where salvage estimates actually get updated, and even there they only affect the depreciation floor and the final-year plug, never the DDB rate itself.

1
Office of the Law Revision Counsel. 26 USC 168 – Accelerated Cost Recovery System
2
Internal Revenue Service. Publication 946, How To Depreciate Property
3
Internal Revenue Service. Topic No. 703, Basis of Assets
4
Federal Reserve Banks. Financial Accounting Manual, Chapter 3 – Property and Equipment
5
Internal Revenue Service. Revenue Ruling 2015-11
6
Office of the Law Revision Counsel. 26 USC 6662 – Imposition of Accuracy-Related Penalty on Underpayments
7
Internal Revenue Service. Revenue Procedure 2004-11