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Product: depreciation engine

Every method, every convention, four books.

Recalculated the moment anything changes. This page is the inventory, so you can check it against your own register before loading an asset.

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Figure 1. Illustrative screen with sample data: one asset, four books, the federal book selected; the rate cites the table it came from.

Four books, and changing one never touches another.

BookPurposeTypical settings
BookGAAP financial statementsStraight line over useful life, salvage, monthly convention
FederalForm 4562 and the federal returnMACRS GDS, half-year or mid-quarter, Section 179, bonus
StateStates that decouple from federal rulesMACRS without bonus, state Section 179 limit, ADS where required
AMTAlternative minimum tax150% declining balance or ADS straight line, per class
Figure 2. The four books.

Eleven methods, six conventions.

MethodWhere it is usedNotes
MACRS GDS 200% declining balance3, 5, 7 and 10-year propertySwitches to straight line in the optimal year; tables or formula
MACRS GDS 150% declining balance15 and 20-year property, farm property
MACRS straight line, mid-month27.5-year residential, 39-year nonresidential, QIP at 15 yearsMid-month on acquisition and disposal
MACRS ADSElected or requiredStraight line over ADS class life
ACRSProperty placed in service 1981 to 1986
Straight lineBook, state, internalSalvage, any life in months
Declining balance, 125% to 200%Book and internalWith or without switch
Sum of the years' digitsBook
Units of productionMachinery, vehicles, extractionHours, units, miles from meter readings
User-defined tablesAny bookAnnual percentages you enter
No depreciationLand, art, construction in progressTracked, excluded from expense
Conventions: half-year, mid-quarter with the automatic 40% test, mid-month, full month, next month, actual days.
Figure 3. Methods and conventions in Fixed Asset Desk 2026.1; MACRS rates from Tables A-1 to A-8 of Publication 946 or the formula.

First-year elections, per asset, per book, per year.

  • Section 179. Annual limit and phase-out across the entity; carryforwards tracked.
  • Bonus depreciation. 100% for property acquired after 19 January 2025; phased rates before it; elect-out by class and year.
  • Listed property and luxury autos. Business-use percentage, annual caps, recapture.
  • State decoupling. A setting per state, not a manual adjustment.
Figure 4. Illustrative screen with sample data: the period run in four books, with the mid-quarter test shown before anything posts.

Any figure can be overridden, and every override is recorded.

Figure 5. Illustrative screen with sample data: the audit trail an auditor asks for, filterable by user, asset and date.

The questions accountants ask about the calculation, answered.

How is the mid-quarter convention decided?

Automatically, at the period run: the 40% test is applied across the year's additions and shown with its arithmetic before anything posts.

Does it handle states that do not follow federal bonus depreciation?

Yes. Each state book has its own bonus and Section 179 treatment, and the federal-to-state difference report shows the addback and the recovery by year.

Which bonus rate applies to property acquired before 20 January 2025?

The phased rate for the year placed in service, 60% in 2024 and 40% in 2025; property acquired after 19 January 2025 takes 100%. The rate is chosen from the acquisition date on the asset.

Can it reproduce a schedule for a closed year?

Yes. Every closed period stays reproducible, and overrides made to match a filed return are kept with the user, the date and the reason.

Does it handle short years, fiscal years and 4-4-5 calendars?

Yes, in the period definition, with the tables prorated as the regulations describe.

Try it on your own register.

Fourteen days, the full product, no card. Load your assets, run a schedule, compare it with what you filed.

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Hosted by us in a dedicated environment for your organisation, or on your own server. One database per customer; your data is exportable in full at any time.

Priced by asset records. Every plan is the full product. Your data is exportable in full, at any time, at no charge. Plans from $1,000 a year.