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Partial-Year Straight-Line Depreciation Calculator

What do the numbers come to once the work is shown?

First-year, full-year and final-year straight-line expense when an asset enters service mid-year, using a monthly convention.

  • Runs in your browser
  • Nothing stored or sent
  • Free, no sign-up
Your figures
Example figuresIllustrative only. Type over them with your own.
First-year expense
$9,750
Annual expense for the months in service
Full-year expense
$13,000
Final-year expense
$3,250
Drawn to one scale
Full-year expense$13,000
First-year expense$9,750
Final-year expense$3,250
Book value at end of first year$74,250
All results
MeasureResult
Full-year expense$13,000
First-year expense
9 months in service
$9,750
Final-year expense$3,250
Book value at end of first year$74,250
Fiscal years touched7.00
How this was worked out
Work shownrecomputed as you type
Annual expense = (cost - salvage) / life
Months in first year = 13 - month placed in service (full month convention)
First year = annual x months / 12; final year = annual x (12 - months) / 12

Illustrative arithmetic on the figures you enter. Check the result against your firm's methodology before relying on it.

The formulas

  • Annual expense = (cost - salvage) / life
  • Months in first year = 13 - month placed in service (full month convention)
  • First year = annual x months / 12; final year = annual x (12 - months) / 12

How it works

When an asset starts mid-year, straight-line expense is prorated by months in service. An asset placed in service in April has nine months in the first year and three in the last, so a six-year life touches seven fiscal years.

This uses a full-month convention where the month of service counts in full. If your policy uses a half-month, mid-month or daily convention, adjust the months entered. The total over the life always equals cost less salvage.

Illustrative figures only. Check the result against your firm's methodology before relying on it.

Common questions

Does the total change with the start month?

No. Total expense is always cost less salvage. Only the timing changes.

What if the asset starts in December?

It gets one month in the first year and eleven in the final year.

Can I use a non-calendar year?

Yes, count month 1 as the first month of your fiscal year.

Formulas on this page are the standard definitions.

Runs in your browser. The figures you type are not sent to CORAA or stored. Check the result against your firm's methodology before relying on it.

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