GDS vs. ADS: the two MACRS systems
Under standard MACRS, a residential rental property depreciates over 27.5 years using the General Depreciation System (GDS). The Alternative Depreciation System (ADS) uses a longer recovery period: 30 years for residential rental property (updated from 40 years by the Tax Cuts and Jobs Act of 2017) and 40 years for non-residential commercial property. Stretching depreciation over more years means a smaller annual deduction. A $500,000 depreciable basis produces roughly $18,182 per year under GDS (27.5 years) versus $16,667 under ADS (30 years).
Qualified improvement property — improvements to the interior of a non-residential building — is depreciated over 15 years under GDS but 20 years under ADS.
When ADS is mandatory
The IRS requires ADS in several situations: property used predominantly outside the United States; tax-exempt use property; tax-exempt bond-financed property; and listed property (such as passenger vehicles) used 50% or less for business. Starting with tax years after 2021, a business that elects out of the Section 163(j) interest expense limitation must use ADS for residential rental (30-year), non-residential real property (40-year), and qualified improvement property (20-year). That trade-off — uncapped interest deductions in exchange for slower depreciation — is often worthwhile for leveraged properties with large interest burdens.
Electing ADS voluntarily
Any taxpayer may elect ADS for a class of property, and the election is irrevocable for that class and year. Why choose slower depreciation? If your rental losses are suspended because you exceed the passive-loss thresholds and are not a real estate professional, burning through depreciation you cannot yet use may not be valuable. ADS lets you preserve those deductions for later. That said, most investors prefer the faster GDS deductions and carry forward any suspended losses, which are released in full when the property is eventually sold.
Frequently asked questions
What is the ADS recovery period for a residential rental?
Under TCJA (effective for property placed in service after 2017), the ADS recovery period for residential rental property is 30 years, compared to 27.5 years under GDS.
Is ADS ever required for residential rentals?
Yes. If your business elects out of the Section 163(j) interest-expense limitation, you must use ADS (30-year) for residential rentals instead of the standard 27.5-year GDS schedule.
Can I switch from GDS to ADS?
Yes, by filing Form 3115 (change in accounting method). Switching from GDS to ADS results in a negative 481(a) adjustment — slower depreciation going forward — without restating prior years.
Sources
Educational information and estimates only. Not tax advice. Tax rules change and vary by situation; consult a qualified tax professional before acting.