Monthly Depreciation Schedule Excel Template

By Gregg Hopfeldt · 2025-05-19

A monthly depreciation schedule in Excel provides a defensible framework for tracking depreciation at a monthly granularity. It supports period integrity and gives auditors and accountants a clear, time-based view of asset value erosion across the financial year.

Why Track Depreciation Monthly?

Monthly granularity is essential for matching depreciation expense to the correct reporting period. This prevents surprises during interim audits and provides a more accurate view of profitability throughout the year. When you track depreciation monthly rather than adjusting at year-end, each period reflects the true cost of asset consumption—giving management accounts the integrity they need for decision-making, and giving auditors a clear, defensible timeline to review.

Purpose

A monthly depreciation schedule makes your fixed asset records more defensible by establishing a consistent, repeatable framework for period-by-period depreciation tracking—reducing the risk of adjustment queries during external review.

The Logic

The schedule satisfies the accounting principle of period integrity under GAAP and IFRS. Monthly granularity allows depreciation expense to be matched to the correct reporting period, which is essential for accurate monthly management accounts and interim audits.

Depreciation is calculated as a function of cost, rate, method, and time. The schedule applies your configured depreciation method—Straight Line or Diminishing/Reducing Balance—across twelve monthly periods, anchored to your financial year start date. For Straight Line, monthly depreciation equals Annual Depreciation / 12. For Diminishing/Reducing Balance, the monthly charge uses Rate applied to Opening Book Value, producing a declining monthly amount.

I've noticed that most accounting errors don't happen at year-end—they happen during the monthly "quick" update. When you're rushing to close the month, it's easy to hard-code a number just to get the journal entry done. But those small "ad hoc" edits are exactly how a register loses its defensibility. A structured schedule stops that habit before it starts.

The Schedule Structure

A defensible monthly depreciation schedule contains the following columns for each asset:

  • Asset Identifier — Unique reference for the asset within your register.

  • Category — Asset classification (e.g., Computer Equipment, Furniture and Fixtures, Office Equipment, Machinery, Buildings) that determines the depreciation rate and method.

  • Cost — Original acquisition cost.

  • Opening Accumulated Depreciation — Total depreciation charged prior to the current financial year.

  • Monthly Depreciation Columns — Twelve columns (Month 1 through Month 12) showing depreciation expense for each period.

  • Year-to-Date Depreciation — Cumulative depreciation for the current financial year.

  • Accumulated Depreciation — Total depreciation from acquisition to period end.

  • Book Value — Cost minus accumulated depreciation at each period end.

  • Depreciation Method — The method applied: Straight Line or Diminishing/Reducing Balance.

  • Depreciation Rate — The annual percentage rate assigned to the asset category.

Steps to Build Your Own Monthly Schedule

  1. Create a new workbook. Open a blank Excel file and set up the columns described above. Reserve the top rows for header information such as your financial year start date and company name.

  2. Enter your financial year start date. Record this in a dedicated cell at the top of the worksheet. This anchor determines which calendar month corresponds to Month 1. For example, if your financial year begins in July, Month 1 represents July.

  3. Enter asset identifiers and categories. Match each row to your fixed asset register. Ensure category names align with your depreciation policy so the correct rate and method apply.

  4. Enter cost and opening accumulated depreciation. Input the original cost and any depreciation already charged from prior periods. These values form the starting point for monthly calculations.

  5. Assign depreciation rate and method. Enter the annual depreciation rate and method for each asset category. For Straight Line, calculate monthly depreciation as =Cost*Rate/12. For Diminishing/Reducing Balance, calculate each month as =Opening Book Value*Rate/12—note that this requires a running calculation where each month's book value feeds the next.

  6. Build the monthly depreciation formulas. Set up twelve columns for Month 1 through Month 12. For Straight Line, link each month to the same annual depreciation divided by 12. For Diminishing/Reducing Balance, each month references the prior month's closing book value. Create formulas that propagate automatically across the row.

  7. Add running totals. Create a Year-to-Date Depreciation column that sums the monthly depreciation columns for the current year. Add an Accumulated Depreciation column that adds Opening Accumulated Depreciation to Year-to-Date Depreciation. Finally, add a Book Value column that subtracts Accumulated Depreciation from Cost.

  8. Lock formula cells. Protect the calculation logic by locking cells that contain formulas. This prevents accidental edits and maintains the stability of the schedule. In Excel, select the formula cells, format them as locked, then protect the worksheet.

Manual verification is a necessary chore in Excel. We built Simple Fixed Assets to eliminate this manual step entirely—the system performs these calculations natively, so you can spend your month-end reviewing the results rather than auditing your own formulas.

  1. Reconcile period-end totals to your general ledger. At each month-end, confirm that the accumulated depreciation and book value columns reconcile to your accounting records. Document the reconciliation in a separate worksheet or audit log.

  2. Archive the completed schedule. Save the workbook with a clear naming convention that includes the financial year and period (e.g., Depreciation_Schedule_2024-25.xlsx). Store the file in a controlled location accessible for audit review.

Outcome

A stable, verified monthly depreciation schedule with clear period-by-period traceability. Each asset shows Cost, Accumulated Depreciation, and Book Value across twelve months, with calculation logic intact and no ghost assets. The schedule reconciles to the general ledger, and the audit trail remains unshakeable—quietly confident and ready for external review.

Already have a schedule? Import your existing template into Simple Fixed Assets.

Stay Depreciated,

Gregg

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