How GP Chooses the First Depreciation Period
Dynamics GP depreciation timing depends on two fields: the Placed-in-Service Date and the Averaging Convention
Start with the Placed-in-Service Date
Everything starts with the Placed-in-Service Date (PISD) the date the asset becomes usable in Dynamics GP. That’s not always the purchase date.
Apply the Averaging Convention
Next, GP checks the Averaging Convention on the asset’s book. This convention tells GP how to read the PISD for depreciation timing.
Here’s how the most common conventions turn a PISD into a start date:
- Full Month → Starts on the first day of the month containing the PISD
- Next Month → Starts on the first day of the next month
- Full Period → Starts on the first day of the fiscal period containing the PISD
- Next Period → Starts on the first day of the next fiscal period
- Full Year → Starts on the first day of the fiscal year
- Next Year → Starts on the first day of the next fiscal year
- Half-Year / Mid-Month / Mid-Quarter → Starts mid-period, which changes the fraction of depreciation taken in year one
- Changes That Affect Depreciation
The first depreciation period depends on two fields: the PISD and the Averaging Convention. GP treats both as depreciation-sensitive change either one, and GP recalculates.
When you change one, GP asks how much of the depreciation schedule to rebuild:
- Life → Rebuilds the schedule from the beginning
- Year → Rebuilds from the start of the current fiscal year
- Recalculate → Rebuilds from the current period forward
This keeps your depreciation schedule mathematically correct.
Example
Asset details:
- PISD: July 20
- Convention: Full Month
GP’s logic:
1. PISD = July 20
2. Full Month → Start date = July 1
3. July = Period 7
4. First depreciation period = Period 7
5. First-year depreciation = 6 months (Jul–Dec)
6. Final-year depreciation = 6 months (mirrored)
Change the convention to Next Month, and the first depreciation period shifts to Period 8.
To Summarize
Understanding how GP determines the first depreciation period gives you control over:
- Depreciation timing
- First-year and final-year depreciation amounts
- How field changes trigger recalculation
- How to troubleshoot unexpected depreciation results
Once you know how GP reads the Placed-in-Service Date and Averaging Convention, the depreciation schedule stops being a mystery it becomes predictable and easy to manage.
Depreciation logic is one of a hundred small things that make GP hard to run without a specialist. If you’ve hit a snag GP support couldn’t untangle, our team handles this daily.
Thinking About Migration? Here are 3 Resources For You
Guide
The GP Optimization Playbook: Modernize While You Stay
Not ready to migrate just yet? This guide is built for organizations staying on GP a little longer. Explore proven ways to optimize performance, improve reporting, and enhance user efficiency while preparing for future modernization.
Data Sheet
GP to BC Migration Data Sheet
Thinking about migrating from Dynamics GP? This quick-reference data sheet outlines the key benefits, migration steps, and reasons why Dynamics 365 Business Central is the smart, future-ready choice for growing businesses.
eBook
GP to Acumatica Data Sheet
This quick-reference data sheet outlines the key benefits of migrating, what to expect during the process, and how Acumatica’s cloud ERP positions your business for long-term success.
