< Finsweet Attributes >
Tax deductions, credits, and amortization

Under what conditions does a switch from MACRS to ADS require a Section 481(a) adjustment, and how does the RPTOB election impact this requirement?

Last updated: 
Sep 2025
Blue J Answer
Blue J leverages the latest large language models and a vast and authoritative tax database to answer tax questions. The information provided does not, and is not intended to, constitute legal advice. Generative AI systems can make mistakes. Verify all important information.
Better Tax Answers For All Your Tax Questions

Ask Blue J any tax question, then go deeper. Follow up, add client-specific context, and explore the sources behind every answer with Blue J’s generative AI solution for tax research.

Table of Contents
Answer

A switch from MACRS (Modified Accelerated Cost Recovery System) to ADS (Alternative Depreciation System) can occur in several contexts, but the requirement for a Section 481(a) adjustment depends on the reason for the switch and the timing of the change. The impact of the real property trade or business (RPTOB) election under Section 163(j) is particularly significant in this context.

1. General Rule: Change in Use vs. Change in Method of Accounting

Change in Use (No Section 481(a) Adjustment)

  • When a taxpayer is required to switch from MACRS to ADS because of a change in use of the property (for example, due to making the RPTOB election under Section 163(j)), the regulations under Treas. Reg. § 1.168(i)-4(f) specify that this is not a change in method of accounting for purposes of Section 446(e). Therefore, no Section 481(a) adjustment is required at the time of the change. The taxpayer simply begins depreciating the property under ADS as of the year of change, using the adjusted basis and remaining recovery period as determined under the new method.
  • This is supported by IRS guidance, which states that when a real property trade or business makes the RPTOB election and must switch to ADS for certain property (nonresidential real property, residential rental property, and qualified improvement property), the switch is treated as a change in use, not a change in method of accounting. Thus, no Form 3115 is required, and no Section 481(a) adjustment is made.

Change in Method of Accounting (Section 481(a) Adjustment Required)

  • If a taxpayer fails to properly switch to ADS when required (for example, after making the RPTOB election), and continues to depreciate property under MACRS, the taxpayer is considered to have adopted an impermissible method of accounting. To correct this, the taxpayer must file Form 3115 to request a change to the permissible method (ADS). In this case, a Section 481(a) adjustment is required to prevent the omission or duplication of income or deductions.
  • The Section 481(a) adjustment is calculated as the difference between the depreciation that was actually taken under the impermissible method (MACRS) and the depreciation that should have been taken under the permissible method (ADS), for all open and closed years prior to the year of change. The adjustment is then taken into account in the year of change (or spread over several years, depending on the size of the adjustment and other rules).

2. The RPTOB Election and Its Impact

  • Under Section 163(j), a taxpayer engaged in a real property trade or business may make an irrevocable election to be excluded from the business interest expense limitation. However, as a condition of this election, the taxpayer must depreciate certain property (nonresidential real property, residential rental property, and qualified improvement property) using ADS rather than MACRS.
  • When the RPTOB election is made, the switch to ADS for affected property is treated as a change in use under Treas. Reg. § 1.168(i)-4(d). As noted above, this does not require a Section 481(a) adjustment, nor does it require the filing of Form 3115.
  • If the taxpayer does not properly implement the required switch to ADS after making the RPTOB election, and continues to use MACRS, the IRS considers this an impermissible method. The taxpayer must then file Form 3115 and make a Section 481(a) adjustment to correct the error.

3. Summary Table

ScenarioSection 481(a) Adjustment Required?Form 3115 Required?Reason
Proper switch to ADS due to RPTOB election (change in use)NoNoTreated as change in use, not method change
Failure to switch to ADS when required, later correctionYesYesCorrection of impermissible method of accounting
Voluntary change from MACRS to ADS (not due to RPTOB election or required by law)YesYesChange in method of accounting

4. Additional Nuances

  • If the taxpayer is making the change as a result of a change in use (e.g., property is now used predominantly outside the U.S., or due to the RPTOB election), the switch is not a method change and no Section 481(a) adjustment is required.
  • If the taxpayer is correcting an impermissible method (e.g., failed to switch to ADS when required), the change is a method change and a Section 481(a) adjustment is required.

5. Key Citations

  • Treas. Reg. § 1.168(i)-4(f): Change in use is not a change in method of accounting.
  • Rev. Proc. 2019-08: Guidance for electing real property trades or businesses.
  • Rev. Proc. 2019-43, Section 6.05: Method change for depreciation due to change in use.
  • Section 481(a): Adjustment required to prevent duplication or omission of income/deductions when changing methods of accounting.

In summary: A switch from MACRS to ADS due to a change in use (such as making the RPTOB election under Section 163(j)) does not require a Section 481(a) adjustment or Form 3115. However, if the taxpayer fails to make the required switch and later corrects the error, a Section 481(a) adjustment and Form 3115 are required to correct the impermissible method of accounting.

Table of Contents

Was this answer helpful?

Go beyond the search box and discover how Blue J makes tax research as quick and easy as asking a colleague.

What Tax Professionals Are Saying

"Blue J is already delivering great results. We are excited to partner with Blue J on this initiative."

Sarah Chen
Senior Tax Manager
Regional Accounting Firm
$37,000+ in tax savings found

“Blue J will expand our generative AI capabilities to give our team members access to high-quality, quickly accessible data and effective research tooling, which, when coupled with their own personal expertise and experience, will unlock new insights with seamless efficiency. Our teams will tap Ask Blue J to discover the best tax law and insights to apply to their clients' individual situations, and in so doing, will enhance their own expertise. We view this collaboration as a win for both our clients and our people."

Sarah Chen
Senior Tax Manager
Regional Accounting Firm
$37,000+ in tax savings found

What Blue J customers are saying

Darin K. Seal

“We are excited to use Blue J to elevate the initial work product our team is able to produce."

"We’re incorporating Blue J to ensure our people are well-equipped with a research tool that delivers on both ease of use and quality of deliverable. It will save us a lot of time as a starting point, so we can focus our efforts on the analysis. Ultimately, it helps us get to the right answer, faster.”

"We’re incorporating Blue J to ensure our people are well-equipped with a research tool that delivers on both ease of use and quality of deliverable. It will save us a lot of time as a starting point, so we can focus our efforts on the analysis. Ultimately, it helps us get to the right answer, faster.”

Read More
Darin K. Seal, Partner In Charge of the Tax Department
HMV CPAs
Matt Mueller

"We had used Checkpoint for a long time but found it wasn’t particularly well-used in our practice."

"A lot of our practitioners would have to turn to Google to find what they were looking for, which of course isn’t ideal. Blue J is a real game-changer when it comes to this, since it combines the efficiency of Google with the authoritative tax materials our people really need to serve their clients best. At ELO, we pride ourselves on providing services that are focused on value for clients and exceeding their expectations. Adding Blue J to our toolbox will enable us to do just that, as we continue to evolve our service offerings to better serve our clients’ needs.”

"A lot of our practitioners would have to turn to Google to find what they were looking for, which of course isn’t ideal. Blue J is a real game-changer when it comes to this, since it combines the efficiency of Google with the authoritative tax materials our people really need to serve their clients best. At ELO, we pride ourselves on providing services that are focused on value for clients and exceeding their expectations. Adding Blue J to our toolbox will enable us to do just that, as we continue to evolve our service offerings to better serve our clients’ needs.”

Read More
Matt Mueller, Partner and Tax Practice Leader
ELO CPAs
David L. Phelps

"We find this tool to be a game-changer for us and our clients.”

“We had the opportunity to pilot some other AI solutions in the market, and found that the improvement over traditional search was limited - except in Blue J’s case, where the efficiency gain over traditional research methods is significant."

“We had the opportunity to pilot some other AI solutions in the market, and found that the improvement over traditional search was limited - except in Blue J’s case, where the efficiency gain over traditional research methods is significant."

Read More
David L. Phelps, Tax Director
Barnes Dennig
Mathew Talcoff

“Blue J is an exciting technology because it enables the practitioner to remain in the driver’s seat of the analysis."

"Thoughtful functions are included to encourage and facilitate deeper analysis, not to replace or reduce it. We’ll continue to find new and impactful ways to leverage the technology, which has benefited our clients and staff alike. At RSM we strive to be compelling to our clients and to be digital by embracing new technologies to fulfill that promise.”

"Thoughtful functions are included to encourage and facilitate deeper analysis, not to replace or reduce it. We’ll continue to find new and impactful ways to leverage the technology, which has benefited our clients and staff alike. At RSM we strive to be compelling to our clients and to be digital by embracing new technologies to fulfill that promise.”

Read More
Mathew Talcoff, Partner and Washington National Tax Leader
RSM US
Tanya Silves

"We wanted to have a tool that people were using at all staff levels."

"We wanted something that lived up on their third screen - something that would be available and helpful to them every day. What we've found is it's been easy to get people to get into the habit of using Blue J because it helps people. Blue J allows us to quickly respond to client questions in a way that they can understand it, which helps us deal with the volume of client questions that come in. We were up and running very quickly with Blue J - within 5 minutes, our staff understood how this will be helpful, and the rest of the training program is refining prompting skills and building use cases and best practices."

"We wanted something that lived up on their third screen - something that would be available and helpful to them every day. What we've found is it's been easy to get people to get into the habit of using Blue J because it helps people. Blue J allows us to quickly respond to client questions in a way that they can understand it, which helps us deal with the volume of client questions that come in. We were up and running very quickly with Blue J - within 5 minutes, our staff understood how this will be helpful, and the rest of the training program is refining prompting skills and building use cases and best practices."

Read More
Tanya Silves, Partner & Tax Director
Larson Gross

Ready to Transform Your Tax Research?

Join thousands of tax professionals who save hours every week with our AI-powered research.