Calculator Inputs
Formula Used
Adjusted cost = Asset cost − Recovery adjustment.
Business basis = Adjusted cost × Business use percentage.
Depreciable base = Business basis − Salvage value − Immediate deduction.
SYD denominator = Useful life × (Useful life + 1) ÷ 2.
Year depreciation = Depreciable base × Remaining life ÷ SYD denominator.
When a partial convention is selected, the calculator prorates the current and prior service-year depreciation.
How to Use This Calculator
- Enter the original asset cost.
- Add any recovery adjustment, such as a rebate or insurance recovery.
- Enter the estimated salvage value.
- Set the useful life and target recovery year.
- Choose the placed-in-service month and recovery convention.
- Add business use percentage and any immediate deduction.
- Press calculate to view the schedule above the form.
- Use the CSV or PDF button to save the result.
Example Data Table
| Asset Cost | Recovery Adjustment | Salvage | Life | Convention | Business Use |
|---|---|---|---|---|---|
| $50,000 | $2,000 | $5,000 | 5 years | Monthly | 100% |
| $85,000 | $7,500 | $10,000 | 7 years | Half year | 90% |
| $120,000 | $0 | $15,000 | 10 years | Full year | 100% |
Understanding Sum of Years Depreciation
Sum of years depreciation is an accelerated method. It assigns larger deductions to early recovery years. That pattern fits assets that lose service value quickly. Machines, vehicles, devices, and tools often match this behavior. The method is also useful when repair costs rise later.
This calculator starts with cost. It then removes recovery adjustments, business use limits, bonus deductions, and salvage value. The remaining amount becomes the depreciable base. The tool then applies the sum of years digits fraction. Early years receive a larger fraction. Later years receive a smaller fraction.
Why Recovery Matters
Recovery changes the starting basis. A recovery amount may represent an insurance payment, rebate, grant, trade allowance, or other cost reduction. Ignoring it can overstate depreciation. The calculator separates recovery from salvage. Recovery reduces the cost before the schedule is built. Salvage is the expected value left after the asset is used.
The calculator also supports conventions. A full year convention gives the first year a complete share. A half year convention spreads part of the first year into the last year. The monthly option uses the placed in service month. Mid quarter treatment is helpful when assets start late in a quarter.
Practical Use
Use the result as an estimate for planning. It can compare asset choices, budgeting effects, and book values. It can also help explain why accelerated depreciation falls each year. The schedule shows annual expense, accumulated depreciation, and ending book value.
Always review final tax treatment with a qualified adviser. Local rules can change. Some rules may limit bonus deductions, recovery periods, listed property, or business use. The calculator gives a clear mathematical schedule. It does not replace professional judgment.
Good inputs produce better outputs. Enter the asset cost from invoices. Use a realistic salvage estimate. Record any recovery adjustment separately. Choose a convention that matches your reporting policy. Then export the schedule for records, worksheets, or client discussions. The method is simple, but the table makes it easier to audit.
For management reporting, the schedule also reveals timing. Higher early deductions lower early book value faster. Later deductions become smaller, so the remaining book value approaches salvage in a controlled and predictable way for careful reviews.
FAQs
What is sum of years depreciation?
It is an accelerated depreciation method. It gives higher expense in early years and lower expense in later years. The method uses a sum of years digits denominator.
What does recovery adjustment mean?
Recovery adjustment is an amount that reduces the asset cost before depreciation. It can represent a rebate, grant, insurance recovery, allowance, or similar cost reduction.
Is salvage value the same as recovery?
No. Recovery reduces the starting basis. Salvage is the expected remaining value after the asset reaches the end of its useful life.
Why does the schedule sometimes show an extra year?
Partial year conventions can move part of one service year into the next calendar year. This creates an extra row while keeping total depreciation limited to the depreciable base.
Can I use a half year convention?
Yes. Choose the half year option. The calculator applies six months in the first year and carries the balance into the final year.
What is the SYD denominator?
It is the sum of the useful life digits. For five years, the denominator is 5 + 4 + 3 + 2 + 1.
Does this calculator replace tax advice?
No. It gives a mathematical schedule. Always confirm reporting rules with a qualified adviser before filing or finalizing records.
Why export CSV or PDF reports?
CSV works well for spreadsheets. PDF works well for records, review packets, and sharing depreciation schedules with managers, clients, or advisers.