Machinery Depreciation Calculator — Straight-Line, Declining Balance, SYD & Units of Production
Machinery Depreciation Calculator
Enter asset cost, salvage value, and useful life — then choose your method: Straight-Line, Double Declining Balance, Sum-of-Years' Digits, or Units of Production. Get a full year-by-year schedule instantly.
Free Tool · SL · DDB · SYD · Units of Production · Year-by-Year Schedule
Asset Information
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IRS MACRS recovery periods. Select to pre-fill useful life. Consult your accountant for tax filing.
$
Total acquisition cost including purchase price, delivery, installation, and capitalized setup costs.
$
Estimated resale or scrap value at end of useful life. CNC machines: typically 10–20% of cost. Use 0 if fully consumed.
Total units, hours, or production runs the machine is expected to produce over its entire life.
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Units produced per year (assumed constant). Depreciation = (cost−salvage) ÷ total units × annual units.
Results
Annual Depreciation (Yr 1)
—
first year expense
Depreciable Base
—
cost − salvage value
Annual Dep. Rate
—
applied to book value
Useful Life
—
years of depreciation
Book Value at Year 5
—
midpoint reference
Fully Depreciated Year
—
reaches salvage value
Remaining Book Value After Year 1
—
Salvage value—Purchase cost
Method Notes
Year-by-Year Schedule
Yr
Year
Dep. Expense
Accum. Dep.
Book Value
Method Comparison (Yr 1–5 Dep. Expense)
Yr
SL
DDB
SYD
Depreciation Methods Explained
All depreciation methods spread the same total depreciable base (cost minus salvage value) across the asset's useful life — only the timing differs. Straight-line spreads expense evenly; accelerated methods (DDB, SYD) front-load depreciation in early years; Units of Production ties expense directly to actual output. Choosing the right method affects your tax liability, reported net income, and the book value that appears on your balance sheet every year.
SL Straight-Line
The simplest and most widely used method. Equal annual depreciation every year. Best for assets that wear evenly over time — buildings, office equipment, and machinery with consistent use.
Accelerated method — highest depreciation in Year 1, declining each year. Rate = 2 × SL rate applied to remaining book value. Stops when book value reaches salvage. Ideal for CNC and high-tech equipment that loses value fastest early.
Rate = 2 ÷ Life (DDB)
Year 1: Cost × Rate
Year 2: (Cost−Y1) × Rate
...stop at salvage value
Example: $250,000 × 20%
= $50,000 Yr 1
$200,000 × 20% = $40,000 Yr 2
SYD Sum-of-Years' Digits
Accelerated method with a gentler curve than DDB. Each year's fraction = remaining years ÷ sum of all years' digits. Ensures full depreciation to salvage value — unlike DDB which may fall short.
SYD = N×(N+1)÷2
(N = useful life)
Year n fraction =
(N − n + 1) ÷ SYD
Example: 10-yr life, SYD = 55
Yr 1: 10/55 × $225,000 = $40,909
Yr 2: 9/55 × $225,000 = $36,818
UoP Units of Production
Ties depreciation to actual output — units, hours, or production runs. No depreciation in idle years; higher expense in high-output years. Best for machinery where wear directly correlates to usage volume.
Dep. per unit =
(Cost − Salvage) ÷ Total units
Annual Dep. =
Dep/unit × Units this year
Example: ($250K−$25K) ÷ 100,000
= $2.25/unit
× 10,000 units/yr = $22,500/yr
Pro Tip — Use Different Methods for Tax and Financial Reporting
Most U.S. businesses use MACRS (Modified Accelerated Cost Recovery System) for tax returns — it is mandatory for U.S. federal taxes and provides the most accelerated deductions. For financial reporting (GAAP), companies often use straight-line to show smoother, more consistent earnings. Using a faster method for taxes and a slower method for books is legal and common — it creates a deferred tax liability on the balance sheet. Section 179 allows U.S. businesses to immediately expense qualifying equipment in the year of purchase — consult your tax advisor to see if your machinery qualifies.
Example Calculations — 3 Common Machinery Scenarios
These examples show how different methods affect depreciation timing for the same asset across three common industrial equipment types.
Annual dep.: $22,500/yr Rate: 10% · Book value yr 5: $137,500
Equal $22,500 expense every year for 10 years. Simplest to budget. Best for financial reporting where consistent earnings matter. At Year 10, book value = $25,000 (salvage).
Year 1 dep.: $51,429 Year 2 dep.: $36,735 · Book val yr 3: ~$66,122
DDB front-loads depreciation — $51,429 in Year 1 vs. $23,571 under SL. Higher early deductions reduce tax liability. Total depreciation over 7 years is the same $165,000 — only timing differs.
🔴 Injection Molder — UoP
Usage-based, variable production
Asset: Injection Mold Machine
Cost: $120,000
Salvage: $10,000
Total units: 500,000 shots
Yr 1 output: 80,000 shots
Method: Units of Production
Dep./unit: $0.22/shot Year 1 dep.: $17,600 · Tied to actual output
Dep. per shot = ($120,000−$10,000) ÷ 500,000 = $0.22/shot. Year 1 at 80,000 shots = $17,600. If output drops to 40,000 shots next year, depreciation drops to $8,800. Best for variable-utilization machines.
Machinery Useful Life Reference — IRS MACRS & GAAP
MACRS recovery periods are mandatory for U.S. federal tax returns — they differ from GAAP useful life used for financial reporting. Always verify with your accountant for your specific jurisdiction and asset class.
Asset Type
IRS MACRS Period
Typical GAAP Life
Method Recommended
Note
CNC Machining Centers Most Common
7 yrs
7–10 yrs
DDB → SL or SL
MACRS 200DB; SL for books
Injection Molding Machines
7 yrs
8–12 yrs
UoP or DDB
Shot-count UoP is most accurate
Hydraulic / Mechanical Presses
7 yrs
10–15 yrs
SL or DDB
Long physical life; 7-yr tax
Laser Cutters / Welding Equipment
7 yrs
7–10 yrs
DDB
Technology obsolescence risk
Forklifts & Material Handling MACRS 5-yr
5 yrs
5–8 yrs
DDB or SL
High wear; MACRS 5-yr class
Computers & Control Systems Fast Obsolescence
5 yrs
3–5 yrs
DDB
Accelerated — tech obsoletes fast
Industrial Robots
7 yrs
7–12 yrs
UoP or DDB
Usage-based if hours tracked
Factory Buildings
39 yrs
30–40 yrs
SL only
Real property — SL required
Frequently Asked Questions
Straight-Line (SL) spreads depreciation evenly — the same dollar amount every year. Double Declining Balance (DDB) accelerates depreciation — you deduct much more in early years and progressively less each year. For a $100,000 machine with a 10-year life: SL gives $9,000/year (assuming $10,000 salvage). DDB gives $20,000 in Year 1, $16,000 in Year 2, $12,800 in Year 3, and so on. Both methods result in the same total depreciation over the asset's life — only timing differs. DDB is beneficial when you want larger tax deductions early in the asset's life to offset high initial profits.
In pure Double Declining Balance, you apply the DDB rate to the remaining book value each year — never reducing below salvage value. Because the rate is applied to a constantly shrinking base, the depreciation amount gets very small in later years but mathematically never quite reaches the salvage value. In practice, businesses using DDB switch to Straight-Line in the year where SL gives a higher deduction — this is called DDB-to-SL switching, and it's actually the default under MACRS. This calculator shows pure DDB stopping at salvage; consult your accountant for the IRS-required switchover timing.
SYD is an accelerated method that front-loads depreciation but with a smoother curve than DDB. For a 5-year asset, SYD = 1+2+3+4+5 = 15. Year 1 gets 5/15 of the depreciable base, Year 2 gets 4/15, and so on — always reaching exactly the salvage value by the final year. SYD is useful when an asset is most productive in its early years, loses value faster initially, or when you want accelerated depreciation but a more predictable decline. Unlike DDB, SYD always fully depreciates to the salvage value without the switchover complication.
Units of Production (UoP) is ideal when the machine's wear is directly tied to actual usage rather than the passage of time. For CNC machines running variable hours, injection molding machines measured in shot counts, or presses measured in strokes, UoP gives the most accurate matching of expense to production activity. In years with low production, you record less depreciation; in high-output years, more. UoP requires tracking actual production figures, which is easy with modern CNC machines that log run hours or part counts. For tax purposes in the U.S., you generally cannot use UoP — MACRS is required. UoP is primarily used for GAAP financial reporting.
A fully depreciated machine remains on the balance sheet at its salvage value (or zero if no salvage was set). No further depreciation expense is recorded — this means your reported costs drop and reported profit increases from that asset. The machine's original cost and accumulated depreciation remain on the books until it is sold or disposed of. If you sell it, any proceeds above book value create a gain; proceeds below create a loss. Many manufacturers run fully depreciated machines for years — they are valuable "free" assets on the production floor. Plan for replacement by tracking actual machine condition and run hours, not just accounting life.
