Finance AI Skill

Depreciation Amortization

Calculate, record, and manage depreciation and amortization for all fixed assets and intangible assets using appropriate methods and useful lives. Use when setting up depreciation schedules, selecting depreciation methods, recording monthly depreciation, ha...

Depreciation & Amortization

Systematically allocate the cost of tangible and intangible assets over their useful lives using appropriate methods, ensuring accurate expense recognition and compliance with accounting standards.

Workflow

Categorize the asset: Classify as tangible fixed asset (depreciation) or intangible asset (amortization); determine if it has a finite or indefinite useful life.
Determine depreciable base: Asset cost less salvage/residual value (for tangible assets) or less any residual value (for intangibles, typically $0).
Assign useful life: Based on asset class, industry standards, company policy, and expected usage pattern — reference IRS Class Lives (US) or local tax authority guidelines.
Select depreciation/amortization method: Choose between straight-line, declining balance, units of production, or sum-of-years-digits based on usage pattern and financial statement objectives.
Set up in fixed asset register: Record asset details, cost, acquisition date, useful life, method, salvage value, and depreciation schedule.
Run monthly depreciation: Automate the calculation and GL posting; verify amounts for reasonableness against prior months.
Handle mid-year acquisitions and disposals: Apply appropriate conventions (half-year, mid-month, mid-quarter) for partial-year depreciation.
Review useful lives periodically: Ensure assigned lives remain appropriate; change accounting estimate if patterns change.
Test for impairment: When triggering events occur, compare carrying amount to recoverable amount; recognize impairment loss if carrying value exceeds recoverable amount.
Prepare fixed asset roll-forward: Generate monthly/quarterly roll-forward report for management review and audit.

Depreciation Methods

METHOD 1: STRAIGHT-LINE (Most Common)
  ────────────────────────────────────
  Annual Depreciation = (Cost − Salvage Value) / Useful Life
  
  Example: Machine costing $100,000, salvage $10,000, life 10 years
  Annual depreciation = ($100,000 − $10,000) / 10 = $9,000/year
  
  Schedule:
    Year  Cost     Depr     Accum Depr   Book Value
    1     $100,000  $9,000   $9,000      $91,000
    2     $100,000  $9,000   $18,000     $82,000
    3     $100,000  $9,000   $27,000     $73,000
    ...
    10    $100,000  $9,000   $90,000     $10,000
  
  Best for: Buildings, furniture, assets with uniform usage pattern
  Financial statement impact: Smooth, predictable expense
  
  METHOD 2: DECLINING BALANCE (Accelerated)
  ─────────────────────────────────────────
  Annual Depreciation = Book Value at Beginning of Year × Depreciation Rate
  Depreciation Rate = (2 / Useful Life) for Double-Declining Balance
  
  Example: $100,000 machine, 10-year life, DDB method (rate = 20%)
  
    Year  Book Value  Depr (20%)  Accum Depr   Ending BV
    1     $100,000    $20,000     $20,000      $80,000
    2     $80,000     $16,000     $36,000      $64,000
    3     $64,000     $12,800     $48,800      $51,200
    4     $51,200      $10,240    $59,040      $40,960
    ...
    Switch to straight-line when SL produces higher expense
  
  Best for: Technology, vehicles, assets that lose value faster early
  Financial statement impact: Higher expense early, lower later
  
  METHOD 3: UNITS OF PRODUCTION (Activity-Based)
  ───────────────────────────────────────────────
  Depreciation per Unit = (Cost − Salvage) / Estimated Total Units
  Period Depreciation = Units Produced × Depreciation per Unit
  
  Example: $100,000 machine, estimated total production 500,000 units
  Depreciation per unit = ($100,000 − $10,000) / 500,000 = $0.18/unit
  
  Year 1: 75,000 units × $0.18 = $13,500
  Year 2: 80,000 units × $0.18 = $14,400
  Year 3: 60,000 units × $0.18 = $10,800
  
  Best for: Manufacturing equipment, vehicles by mileage
  Financial statement impact: Expense follows production
  
  METHOD 4: SUM-OF-YEARS-DIGITS (Accelerated)
  ────────────────────────────────────────────
  SYD = n(n+1)/2 where n = useful life
  Year 1 Depreciation = (n/SYD) × (Cost − Salvage)
  
  Example: $100,000, 5-year life, $10,000 salvage
  SYD = 5×6/2 = 15
  
    Year  Fraction   Depr     Accum Depr   Book Value
    1     5/15       $30,000   $30,000      $70,000
    2     4/15       $24,000   $54,000      $46,000
    3     3/15       $18,000   $72,000      $28,000
    4     2/15       $12,000   $84,000      $16,000
    5     1/15        $6,000   $90,000      $10,000
  
  Best for: Assets with front-loaded utility, tax acceleration goals

Useful Life Guidelines

RECOMMENDED USEFUL LIVES BY ASSET CLASS:

TANGIBLE ASSETS:
  ───────────────
  Asset Class              GAAP Life    Tax Life (MACRS)   Notes
  ─────────────────────────────────────────────────────────────────────
  Land                     N/A          N/A                Not depreciated
  Buildings                30–40 yrs    39 yrs (non-res)   Excludes land value
  Building improvements    10–15 yrs    15–39 yrs          ROUs, renovations
  Machinery/Equipment      5–15 yrs     5–7 yrs            Varies by type
  Computers                3–5 yrs      5 yrs              Hardware only
  Software (purchased)     3–5 yrs      5 yrs              Not custom development
  Vehicles                 5–8 yrs      5 yrs              Cars, trucks, fleet
  Furniture/Fixtures       7–15 yrs     7 yrs              Office furniture
  Leasehold improvements   Lesser of   15 yrs             Lesser of useful life
                           lease term                            or remaining lease
  
  INTANGIBLE ASSETS:
  ──────────────────
  Asset Class              Amortization Life   Notes
  ──────────────────────────────────────────────────────────────
  Patents                  Legal life or       Lesser of remaining legal life
                           economic life       or economic benefit period
  Trademarks               Indefinite          If indefinite → no amortization, 
                           (if indef.)         annual impairment test only
  Copyrights               15–25 yrs           Economic life
  Customer relationships   5–15 yrs            Based on attrition rate analysis
  Non-compete agreements   Term of agreement   Typically 2–5 years
  Software (developed)     3–7 yrs             Economic useful life
  Goodwill                 Indefinite          No amortization; annual impairment
  Trade names              10–20 yrs           Or indefinite if perpetual value
  Licenses/Permits         Term of license     Remaining contractual term
  Developed technology     5–10 yrs            Based on obsolescence rate

  RULE: Useful life = shorter of economic life and legal life
  Review lives annually; change is a change in estimate (prospective, not retroactive)

Partial-Year Depreciation Conventions

CONVENTIONS FOR MID-YEAR ACQUISITIONS/DISPOSALS:

HALF-YEAR CONVENTION (MACRS default):
  ─────────────────────────────────────
  Asset placed in service anytime during year → 6 months depreciation in first year
  Asset disposed anytime during year → 6 months depreciation in last year
  
  Example: $100,000 machine, 10-year SL, acquired June 15
  Year 1 (half-year): $9,000 × 6/12 = $4,500
  Year 2–10: $9,000 per year
  Year 11 (half-year): $9,000 × 6/12 = $4,500 (if held through year 11)

MID-MONTH CONVENTION (Buildings, MACRS):
  ──────────────────────────────────────
  Asset acquired mid-month → 17.5 days of that month (half-month)
  
  Example: $500,000 building, 39-year SL, acquired March 15
  Month of acquisition: 17.5/365 of annual depreciation
  Annual depr = $500,000 / 39 = $12,821
  Year 1: $12,821 × (10.5 months / 12) = $11,218

MID-QUARTER CONVENTION (MACRS trigger):
  ──────────────────────────────────────
  Triggered when > 40% of assets placed in service in Q4
  Assets depreciated from midpoint of quarter of placement
  
  Example: 3 of 5 assets placed in Q4 → mid-quarter convention applies to ALL assets
  Q4 assets: 1.5 months depreciation (half of Q4)

GAAP vs. TAX:
  ────────────
  • GAAP: Company chooses convention (half-year common for simplicity)
  • Tax (US): MACRS conventions are prescribed by IRS
  • Book-tax differences tracked in deferred tax accounts

Asset Disposal Accounting

ASSET DISPOSAL — RECORDING THE TRANSACTION:

  When an asset is sold, retired, or disposed:

  1. DETERMINE CARRYING AMOUNT:
     Carrying Amount = Original Cost − Accumulated Depreciation
  
  2. STOP DEPRECIATION:
     Depreciate through the disposal date (or convention-appropriate period)
  
  3. RECORD DISPOSAL:
     Dr. Accumulated Depreciation     [$accum depr]
     Dr. Cash/Proceeds                [$proceeds]
     Dr. Loss on Disposal             [$if proceeds < carrying amount]
       Cr. Fixed Asset                [$original cost]
       Cr. Gain on Disposal           [$if proceeds > carrying amount]

  EXAMPLE — SALE:
    Machine: Cost $100,000 | Accum Depr $63,000 | Carrying Amount $37,000
    Sold for: $45,000
    
    Gain = $45,000 − $37,000 = $8,000
    
    Dr. Accumulated Depreciation      $63,000
    Dr. Cash                          $45,000
      Cr. Fixed Asset (Machinery)     $100,000
      Cr. Gain on Asset Sale          $8,000

  EXAMPLE — RETIREMENT (no proceeds):
    Equipment: Cost $50,000 | Accum Depr $42,000 | Carrying Amount $8,000
    
    Loss = $0 − $8,000 = ($8,000)
    
    Dr. Accumulated Depreciation      $42,000
    Dr. Loss on Asset Retirement      $8,000
      Cr. Fixed Asset (Equipment)     $50,000

  TAX CONSIDERATIONS:
    • Gain on depreciable property: May be Section 1231 gain (preferential rate) 
      or Section 1245 recapture (ordinary income to extent of depreciation taken)
    • Loss on disposal: Generally deductible as ordinary loss
    • Like-kind exchange (Section 1031): Defers gain on real property exchanges

Impairment Testing

IMPAIRMENT TEST — WHEN AND HOW:

TRIGGERING EVENTS (test when these occur):
  ⚠ Significant decline in market value
  ⚠ Physical damage or obsolescence
  ⚠ Adverse changes in legal/regulatory environment
  ⚠ Asset will be disposed earlier than planned
  ⚠ Operating losses + cash flow losses using the asset
  ⚠ Restructuring affecting the asset

TWO-STEP TEST (US GAAP — Finite-Life Assets):
  ─────────────────────────────────────────────

  STEP 1: Recoverability Test
    Compare: Carrying Amount vs. Undiscounted Future Cash Flows
    If Carrying Amount > Undiscounted Cash Flows → Impairment exists → Go to Step 2
    If Carrying Amount ≤ Undiscounted Cash Flows → No impairment → Stop

  STEP 2: Measurement
    Impairment Loss = Carrying Amount − Fair Value
    Fair Value = Market price (if available) OR discounted cash flow OR appraisal
    
    Record:
      Dr. Impairment Loss             [$loss]
      Cr. Accumulated Impairment      [$loss]

  EXAMPLE:
    Production Line: Carrying Amount $2,000,000
    Undiscounted future cash flows: $1,800,000
    → Fail recoverability test ($2M > $1.8M)
    
    Fair value (discounted): $1,500,000
    Impairment loss: $2,000,000 − $1,500,000 = $500,000
    
    Dr. Impairment Loss          $500,000
    Cr. Accumulated Impairment   $500,000

  ANNUAL TEST — Indefinite-Life Intangibles & Goodwill:
  ─────────────────────────────────────────────────────
  Test at least annually (typically fiscal year-end)
  Compare: Carrying amount vs. Fair value
  If Carrying > Fair value → Impairment loss recognized immediately

Edge Cases

Asset with no salvage value: Use full cost as depreciable base; common for technology assets
Fully depreciated asset still in use: Continue on fixed asset register at zero book value; depreciate no more; test for impairment if condition deteriorates further
Component depreciation: When an asset has major components with different lives (e.g., building structure + HVAC + elevator), depreciate each component separately
Revaluation model (IFRS only): IAS 16 permits revaluation to fair value; revaluation surplus goes to OCI, not P&L; subsequent depreciation based on revalued amount
Construction in progress (CIP): Not depreciated until placed in service; move to appropriate asset class when completed
Asset exchange/trade-in: Derecognize old asset, recognize new asset at fair value; calculate gain/loss on old asset disposal
Capital vs. repair judgment: Betterment/improvement = capitalize (add to asset basis); maintenance/repair = expense; use the "betterment test" — does it extend life, increase capacity, or improve quality?

Output

Fixed Asset Roll-Forward Report

FIXED ASSET ROLL-FORWARD — January 2025
==========================================

CATEGORY: MACHINERY & EQUIPMENT
  (in thousands)

                    Beg Balance   Additions   Disposals   Transfer In   Transfer Out   End Balance
──────────────────────────────────────────────────────────────────────────────────────────────────────
Gross Cost           $4,200        $180        ($45)       $25           ($10)          $4,350
Accumulated Depr.    ($2,800)      ($12)       $38         —             $8             ($2,766)
──────────────────────────────────────────────────────────────────────────────────────────────────────
Net Book Value       $1,400        $168        ($7)        $25           ($2)           $1,584
──────────────────────────────────────────────────────────────────────────────────────────────────────

SUMMARY — ALL ASSET CATEGORIES:
  Category               Gross Cost   Accum Depr   NBV        Depr Expense (MTD)
  ──────────────────────────────────────────────────────────────────────────────
  Buildings              $12,500      ($3,750)     $8,750     $88
  Machinery & Equipment  $ 4,350      ($2,766)     $1,584     $28
  Computers & IT         $ 2,100      ($1,680)     $420       $15
  Vehicles               $ 800        ($600)       $200        $5
  Furniture & Fixtures   $ 650        ($455)       $195        $5
  Leasehold Improv.      $ 950        ($665)       $285        $9
  ──────────────────────────────────────────────────────────────────────────────
  Total Tangible         $21,350      ($9,916)     $11,434    $150
  
  Intangibles:
  Software               $ 1,200      ($600)       $600       $10
  Patents                $ 500        ($200)       $300        $3
  Customer Rel.          $ 800        ($400)       $400        $5
  Goodwill               $2,000       $0           $2,000     $0
  ──────────────────────────────────────────────────────────────────────────────
  Total Intangible       $4,500       ($1,200)     $3,300     $18
  
  GRAND TOTAL            $25,850      ($11,116)    $14,734    $168

KEY METRICS:
  Depreciation rate (annualized): 4.9% of gross tangible assets
  Average asset age: 6.2 years
  Assets fully depreciated but in use: $320K (2.5% of gross)
  Impairment losses YTD: $0
  Capital expenditure YTD: $180K (M&E additions)

Integration Points

Fixed asset modules (SAP FI-AA, Oracle Assets, NetSuite FA): Asset register, depreciation engine
ERP/GL: Monthly depreciation journal entries, disposal postings
Procurement systems: Asset capitalization from POs and invoices
Tax software: MACRS schedules, book-tax difference tracking, Form 4562 preparation
Impairment testing tools (Sigma, Refinitiv): Fair value estimation, DCF models
Physical asset management (Hou.Ki, Cheqroom): Tagging, location tracking, physical verification
BI tools: Fixed asset dashboards, depreciation forecasts, capital planning
Audit management platforms: Depreciation testing workpapers, audit evidence