# Sum of Years Digits Depreciation Calculator

> Calculate accelerated depreciation using the sum-of-the-years-digits method and create a full schedule.

Page: https://askcalculators.com/calculator/sum-of-years-digits-depreciation-calculator/
Definition: https://askcalculators.com/calculator/sum-of-years-digits-depreciation-calculator/definition.json
JSON Schema: https://askcalculators.com/calculator/sum-of-years-digits-depreciation-calculator/schema.json
Version: 1.0.0
Maintained by: AskCalculators (software project; not a credentialed reviewer)
Qualified review: pending. Automated checks do not establish professional approval.
Page status: Live
Review status: Pending

## Use
Open the calculator page and enter values. Query-string parameters can restore and bookmark a calculation.
Example: https://askcalculators.com/calculator/sum-of-years-digits-depreciation-calculator/?cost=50000&salvageValue=5000&usefulLife=8&selectedYear=1

## Inputs
- cost: Asset cost; type=money; required; default=50000; min=0.01
- salvageValue: Salvage value; type=money; required; default=5000; min=0
- usefulLife: Useful life in years; type=number; required; default=8; min=1; max=100
- selectedYear: Year to inspect; type=number; required; default=1; min=1; max=100

## Outputs
- selectedYearDepreciation: Selected-year depreciation; format=currency; primary
- sumOfYears: Sum-of-years denominator; format=integer
- totalDepreciation: Total depreciation; format=currency
- endingBookValue: Ending book value; format=currency

## Formula
year k depreciation = (cost − salvage) × (life − k + 1) ÷ [life(life+1)/2]

## Rules
- Empty optional inputs are undefined, not zero.
- Hidden conditional inputs are ignored.
- Do not invent missing required inputs.

Notice: Accounting and tax depreciation rules can differ. This schedule is an educational estimate.