Depreciation Calculator
Generate GAAP, IFRS, and IRS-compliant asset depreciation schedules. Compare Straight-Line, Double Declining Balance, Sum-of-Years' Digits, Units of Production, and MACRS with Section 179 and Bonus Depreciation tax shields.
Asset Parameters
US Tax Incentives (Sec 179 / Bonus)▼
Auto-calculated rate for 2026: 20%
Asset Cost: $30,000 | Method: MACRS
| # | Calendar Yr | Start Book Value | Incentives (179/Bonus) | Standard Dep | Total Dep Expense | Accumulated Dep | End Book Value | Tax Savings (21%) |
|---|---|---|---|---|---|---|---|---|
| 1 | 2026 | $30,000 | - | $6,000 | $6,000 | $6,000 | $24,000 | $1,260 |
| 2 | 2027 | $24,000 | - | $9,600 | $9,600 | $15,600 | $14,400 | $2,016 |
| 3 | 2028 | $14,400 | - | $5,760 | $5,760 | $21,360 | $8,640 | $1,210 |
| 4 | 2029 | $8,640 | - | $3,456 | $3,456 | $24,816 | $5,184 | $726 |
| 5 | 2030 | $5,184 | - | $3,456 | $3,456 | $28,272 | $1,728 | $726 |
| 6 | 2031 | $1,728 | - | $1,728 | $1,728 | $30,000 | $0 | $363 |
| Σ | Total | - | $0 | $30,000 | $30,000 | - | - | $6,300 |
Accounting Principles & Mathematical Formulations
Cost allocation theorems, declining balance factors, and IRS MACRS statutory schedules
In financial reporting and corporate tax compliance, depreciation represents the systematic, rational allocation of the capitalized historical cost of a tangible fixed asset across its estimated productive useful life. Governed under US GAAP (ASC 360), International Financial Reporting Standards (IAS 16), and the Internal Revenue Code (IRC § 167 & § 168), depreciation matches the capital expenditure of revenue-producing machinery, vehicles, and real property with the revenue generated across periods (the matching principle).
1. Straight-Line Depreciation (SL)
Allocates an identical dollar amount of expense each fiscal year. The asset is depreciated until its carrying book value equals the residual salvage value.
2. Double Declining Balance (DDB)
Accelerates expenses by applying twice the straight-line rate (200%) to beginning-of-year carrying Book Value ($BV$), subject to a strict salvage floor.
3. Sum-of-Years' Digits (SYD)
Multiplies depreciable base by a declining fractional weight based on remaining useful years over the triangular sum of total years $S = N(N+1)/2$.
4. Units of Production (UOP)
Variable activity-based depreciation tied directly to manufacturing throughput, engine hours, or odometer miles rather than calendar passage.
US Federal Tax Standards: The MACRS Framework (IRC § 168)
For federal tax purposes in the United States, taxpayers must use the Modified Accelerated Cost Recovery System (MACRS) under the General Depreciation System (GDS) or Alternative Depreciation System (ADS). Unlike GAAP, MACRS completely ignores estimated salvage value, depreciating 100% of the asset's cost basis down to zero.
Under IRS Publication 946, 3, 5, 7, and 10-year property classes utilize the 200% declining balance method switching automatically to straight-line when optimal, while incorporating the mandatory half-year convention (treating all assets placed in service during the tax year as having been placed in service at the exact mid-point of the year). Consequently, a 5-year MACRS asset is recovered across 6 tax years (20.00%, 32.00%, 19.20%, 11.52%, 11.52%, 5.76%).
Comprehensive Depreciation Methodology Matrix
Comparative technical mechanics across primary financial and tax schedules
| Methodology | Cost Basis Formula | Salvage Value Recognition | Expense Profile | Primary Regulatory & Practical Use |
|---|---|---|---|---|
| Straight-Line (SL) | (Cost - Salvage) / N | Deducted from cost basis | Constant (flat annual expense) | GAAP/IFRS public reporting, buildings, software |
| Double Declining (DDB) | BV_{t-1} × (2 / N) | Enforced as lower floor limit | Heavily front-loaded | Rapidly obsolescing tech, high-wear industrial assets |
| 150% Declining Balance | BV_{t-1} × (1.5 / N) | Enforced as lower floor limit | Moderately front-loaded | IRS MACRS 15/20-year property, utility plants |
| Sum-of-Years' Digits | (Cost - Salvage) × Weight_t | Deducted from cost basis | Steep linear descent | Financial modeling of heavy machinery and aerospace |
| MACRS (IRS Pub 946) | Unadjusted Cost × r_{table} | Ignored (depreciates to $0) | Statutory curve (half-year) | Mandatory US corporate federal income tax returns |
| Units of Production | (Cost - Salvage) × (U_t / U_total) | Deducted from cost basis | Directly variable to output | Mining, commercial printing presses, long-haul trucking |
Frequently Asked Questions
Expert guidance on asset write-offs, MACRS recovery classes, and tax shield optimization
What is the difference between Straight-Line and Double Declining Balance depreciation?
Straight-Line spreads depreciation expense evenly across all years of an asset's useful life, while Double Declining Balance applies twice the straight-line rate to remaining book value, accelerating tax deductions into earlier operational years.
How does MACRS depreciation work for US federal business taxes?
The Modified Accelerated Cost Recovery System (MACRS) assigns assets to specific IRS recovery classes (3, 5, 7, 10, 15, or 20 years) and applies statutory percentages that incorporate the half-year convention, ignoring salvage value.
What happens when an asset's book value reaches its estimated salvage value?
Under GAAP and IFRS accounting standards, an asset cannot be depreciated below its salvage (residual) value. In declining balance methods, depreciation stops or is capped once book value reaches the salvage floor.
How do Section 179 and Bonus Depreciation impact annual depreciation schedules?
Section 179 allows businesses to deduct the full purchase price of qualifying equipment in year one up to statutory IRS caps, while Bonus Depreciation allows immediate deduction of a percentage of the remaining cost basis before regular depreciation begins.
When should a business choose Units of Production over time-based depreciation?
Units of Production is ideal for machinery, vehicles, and industrial equipment whose physical wear correlates directly with operating hours, miles driven, or units manufactured rather than the mere passage of calendar time.