How Simple Fixed Assets Calculates Depreciation Automatically
By Gregg Hopfeldt · 2025-05-19
Automatic depreciation calculation in Simple Fixed Assets produces a stable, repeatable record that remains defensible under audit scrutiny.
How Does Automated Depreciation Calculation Work?
The software acts as a calculation engine that takes your specific accounting policies—the rates and methods you set—and applies them globally across your register. This ensures that every asset is treated with absolute consistency, removing the variability that creeps into manual spreadsheets.
The Purpose
This feature ensures your depreciation records are consistent year over year, reducing the risk of manual errors and providing an unshakeable audit trail.
The Logic
Simple Fixed Assets applies one of two verified calculation methods to each asset, based on the category you assign:
Straight Line — depreciates the asset by an equal amount each year over its useful life. The annual charge remains constant, making forecasts predictable and easy to document.
Diminishing/Reducing Balance — applies a fixed percentage to the remaining book value each year. The charge decreases over time as the asset's carrying value declines.
The system anchors all calculations to the Start of the Financial Year you configure during setup. Each asset category—Computer Equipment, Vehicles, Furniture and Fixtures, and others—carries its own rate and method. Once set, the calculation logic applies automatically to every asset in that category.
This approach prevents what might be called "formula drift." In a manual spreadsheet, a cell reference can shift, a formula can be overwritten, or a rounding difference can compound over time. Simple Fixed Assets removes those variables. The logic is fixed, the inputs are verified, and the output is repeatable. It isn't prone to human error. I've seen it a thousand times: an accountant doesn't like the depreciation number the spreadsheet produced, so they 'tweak' a cell to match their expectations. They tell themselves they'll fix the formula later, but they never do. That one manual override is a ticking time bomb for an audit. We built Simple Fixed Assets to remove that temptation by making the logic unshakeable.
The integrity of prior periods is rock solid as the system won't change your history, as a human could, and keeps your records audit-ready.
The Steps to check and edit your depreciation
Open your fixed asset register and navigate to Settings.
Confirm the Start of the Financial Year is set correctly. This date anchors all depreciation calculations.
In Depreciation Configuration, change the depreciation method and rate to each asset category if you would like to. For example, set Computer Equipment to Straight Line at 25%, or Vehicles to Diminishing Balance at 20%.
Select Save Configuration. The system now applies these defaults automatically when you add assets.
When adding assets via Smart Entry, ensure the correct category is selected. Simple Fixed Assets will calculate accumulated depreciation automatically based on the category's settings.
If you adjust rates or methods later, the system automatically updates current-year values. Historical depreciation remains unchanged. This is the 'Protective Expert' at work. In a spreadsheet, changing a rate can accidentally ripple through your entire history. In Simple Fixed Assets, your past is locked in stone, protecting your prior-year tax filings while you adjust for the future.
The Outcome
A successfully maintained depreciation schedule produces a sharp, clear ledger with zero ghost assets. Each asset shows a verified cost, accumulated depreciation, and carrying value that align with the method and rate assigned to its category. When you generate an audit report, the footer notes whether Straight Line or Diminishing Balance was applied, providing a clean record that stands up to review.
The result is quietly confident: a depreciation schedule template you can rely on, year after year, without surprise adjustments or retroactive corrections.
Stay Depreciated, Gregg