The Mid‑Month Convention is a depreciation rule used for real property under MACRS. It assumes that property is placed in service or disposed of at the midpoint of the month, regardless of the actual date of the transaction.
📅 When Is It Used?
The Mid‑Month Convention is:
- ✅ Required for real property under MACRS
- ❌ Not used for personal property
It applies to:
- Residential rental property (e.g., rental homes, apartments)
- Nonresidential real property (e.g., office buildings, retail space)
💡 Why Does It Matter?
Instead of allowing a full month’s depreciation for the month the property is placed in service or sold, the Mid‑Month Convention:
- Allows only half a month’s depreciation for:
- The first month, and
- The final month
- Standardizes depreciation calculations
- Extends depreciation into an additional year because of the half‑month rules
🏠 Example
A taxpayer buys a rental house and places it in service on August 20.
- Even though the property is placed in service late in the month,
- The IRS treats it as placed in service on August 15
✅ The taxpayer:
- Gets ½ month of depreciation for August
- Gets full months thereafter
- Will also get ½ month of depreciation in the year the property is disposed of
⚡ Quick Tips
If a taxpayer buys or sells real estate during the year, depreciation must follow the Mid‑Month Convention.
✅ Understanding the rule helps explain why first‑ and last‑year depreciation amounts may look smaller or “off”
📊 Depreciation Convention Comparison
| Convention | When Used | Property Type | First‑Year Depreciation Impact |
|---|---|---|---|
| Half‑Year | Default unless Mid‑Quarter applies | Personal property (computers, vehicles, equipment) | Assumes placed in service halfway through the year; ½ year of depreciation in year one |
| Mid‑Quarter | Required if >40% of personal property is placed in service in the last 3 months of the year | Personal property | Assumes placed in service in the middle of the quarter; often reduces first‑year depreciation |
| Mid‑Month | Required for real property under MACRS | Residential rental and nonresidential real property | Assumes placed in service in the middle of the month; ½ month of depreciation in first and final months |
💡 Agent Notes
- Mid‑Month Convention:
- ✅ Always applies to buildings
- ❌ Never applies to personal property
- The rule affects both acquisition and disposition
- Combined with long recovery periods (27.5 or 39 years), this explains why rental depreciation often spans more calendar years than expected