Missed Depreciation on Rentals? Amend vs. Form 3115
If you bought rentals in 2022–2024 and didn’t take bonus depreciation or cost segregation, you’ve got two ways to fix it:
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Amend a prior year (cash refunds potential), or
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File Form 3115 for an accounting method change (a big current‑year catch‑up, not a prior‑year refund).
This article breaks down how each path works, how to tell which one you’re allowed to use, and a practical playbook to maximize cash and stay audit‑ready.
The two key rules (plain English)
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One missed filed year → you can usually amend that year.
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Two or more consecutive filed years missed → the IRS treats your approach as an adopted method. You fix it with Form 3115 and a Sec. 481(a) catch‑up deduction in the change year (no refund for those earlier years via amendment).
Why this matters: Amendments target cash refunds from what you already paid. 3115 moves the benefit into the current year and forward.
Quick context: bonus percentages by year
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2022: 100% bonus
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2023: 80% bonus
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2024: 60% bonus
(Phases down further after 2024 unless law changes.)
This means 2022 amendments can be especially valuable if eligible, while 2024 still delivers meaningful refunds (just at 60% bonus).
How to tell which path applies to each property
Ask, for each property and each entity:
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Placed‑in‑service year?
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How many filed returns went by without the right depreciation/cost seg?
If only one filed year missed for that property → Amend.
If two or more filed years missed → 3115 with Sec. 481(a) catch‑up.
Mechanically, Form 3115 is typically per entity (e.g., one for a partnership, separate ones for any disregarded SMLLCs, if applicable).
What 3115 actually does (and doesn’t)
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Does: Switch you from an impermissible method to the correct one and books the difference as a Sec. 481(a) catch‑up in the change year. This can be a very large deduction.
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Doesn’t: Create prior‑year refunds. It reduces tax this year; any excess generally becomes an NOL carryforward under current rules (carrybacks are very limited).
Passive vs. non‑passive: can I use the deduction now?
Your ability to use the 481(a) catch‑up (or a big amended‑year deduction) hinges on passive loss rules:
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Short‑term rentals (STRs) may be non‑passive if average stays are short enough and you materially participate.
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Long‑term rentals are generally passive unless you qualify as a Real Estate Professional and meet material participation.
Why it matters:
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Non‑passive = deduction can offset ordinary income in the year you claim it.
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Passive = unused losses carry forward until you have passive income or dispose of the activity.
We always test these facts up front so your plan targets usable deductions.
Example (illustrative numbers)
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You bought 15 properties between 2022–2024 and didn’t do cost seg.
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2022 & 2023: missed in both years → 3115 in the current year creates a $600,000 481(a) catch‑up.
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2024: first missed year → Amend 2024 and generate a $180,000 deduction that may yield a refund (depending on what you paid in 2024).
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If the $600,000 481(a) creates an NOL, it carries forward to offset future income (subject to the usual limits).
Statute of limitations (refund clock)
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Refund claims are generally 3 years from the return’s due date or filing date (whichever is later).
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If a year is getting tight, consider a protective claim while you finalize the numbers.
Partnerships: the BBA wrinkle
If you have a 1065 (partnership) return and did not elect out of the centralized partnership audit regime, amendments can be costly/complex (AAR, push‑out, etc.).
Practical tip: In some cases it’s cleaner to avoid amending those years and use 3115 instead.
Your action plan (the practical playbook)
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Inventory the portfolio (property, entity, placed‑in‑service date, method actually used).
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Sort properties:
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Amend: only one filed year missed (e.g., many 2024 assets).
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3115: two+ filed years missed (common for 2022–2023 assets).
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Model cash: estimate refunds from amendments and current‑year tax savings from the 481(a) catch‑up.
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Validate usage: test STR/REP/material participation so deductions are usable (non‑passive if eligible).
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Execute: order cost seg (engineer‑backed or vetted software), file 3115 per affected entity, and amend the targeted years.
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Document: keep depreciation schedules, cost seg reports, service logs (for STR), ownership docs, and your decision memo.
FAQs
Can I both amend and file 3115?
Yes—by property/year.
Is 3115 one per property?
Usually per entity. You can list multiple assets on a single entity’s change.
Will 3115 give me cash back for prior years?
No. It creates a current‑year deduction; prior‑year refunds come from amendments.
Do I need an engineer for cost seg?
Engineer‑backed studies are the gold standard (especially for audits). Good software outputs can be used with care; we balance cost, speed, and audit risk.
Bottom line
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Refunds are most likely from amending a single missed year.
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Big current‑year deductions come from Form 3115 for properties with two+ missed filed years.
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Confirm passive vs. non‑passive so you actually use the deductions.
If you want a done‑for‑you roadmap, we start with a quick assessment: we map properties by year/entity, show exactly what to amend vs. change, and deliver a clear refund + deduction plan with fixed pricing.
Joe Gallegos, CPA/CVA
Partner-in-Charge · JAG CPA & Co.
Author of The Ultimate Guide to Choosing a CPA
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