Owning rental property is one of the most effective ways to build wealth, but the tax rules surrounding it are strict. A very common scenario we see at our firm involves landlords who have not been claiming depreciation expense—often for many years.
Sometimes owners skip it thinking they will save on taxes later when they sell, or simply because they weren’t aware they had to take it. However, under U.S. tax law, this can lead to a costly surprise.
1. The Legal Reality: Depreciation is Not Optional
Under the Internal Revenue Code (IRC), depreciation is not a choice; it is a requirement. The law follows a standard known as “Allowed or Allowable.”
This means that when you eventually sell your property, the IRS will calculate your capital gains tax assuming you did take the depreciation (because it was “allowable”), even if you never actually claimed the deduction.
The result? You could end up paying tax on a benefit you never received.
2. Why You Can’t Just “Amend” Past Returns
If you realize you missed depreciation for the last 10 years, your instinct might be to file amended tax returns (Form 1040-X) for those years.
Legally, you generally cannot do this. The IRS has a specific rule: if you miss depreciation for two or more consecutive years, you have effectively adopted a specific “Accounting Method.”
Because the IRS values consistency, they do not allow you to go back and rewrite history by amending old returns (plus, many of those years are likely closed due to the statute of limitations). Instead, you must request permission to change your accounting method moving forward.
3. The Solution: Form 3115 and the §481(a) Adjustment
To fix this legally, we follow specific IRS Revenue Procedures to file Form 3115 (Application for Change in Accounting Method).
This form tells the IRS: “I was using an impermissible method (no depreciation), and now I want to switch to a permissible method (taking depreciation).”
The mechanism to fix the math is called a Section 481(a) adjustment.
- It calculates all the depreciation you should have taken over the years.
- Instead of losing those deductions, the law allows you to claim the entire missed amount as a one-time deduction in the current year.
- This “catch-up” deduction is fully legal and does not require IRS pre-approval if filed correctly under the automatic change rules.
Important Timing: When to File Form 3115
Because this is a formal change in accounting method, the procedural timing is strict. You generally cannot fix this error on a tax return that has already been filed.
- If you haven’t filed your current year’s return yet: We can attach Form 3115 to your return and claim the full “catch-up” deduction immediately.
- If you have ALREADY filed your return for this year: You generally cannot simply amend your return just to add this form. The IRS usually does not permit accounting method changes on amended returns. We typically must wait and apply this adjustment to your next year’s tax return.
Summary
- The Law: Depreciation is mandatory (“allowed or allowable”). Ignoring it hurts you when you sell.
- The Fix: Do not amend old returns. We must file Form 3115 to correct your accounting method.
- The Benefit: You can usually deduct the entire backlog of missed depreciation in a single year, significantly lowering your current taxable income.
Disclaimer: Tax laws are complex and subject to change. This post is for informational purposes only and does not constitute legal or tax advice. Every taxpayer’s situation is unique.
出租房忘了折舊怎麼辦？小心「允許或應允許」的稅法陷阱與補救之道
出租房產是累積財富的有效途徑，但其相關的稅務規則卻相當嚴格。我們事務所經常遇到這樣的情況：房東擁有多套出租房，卻多年未申報「折舊費用」(Depreciation)。
有些房東是為了以後賣房時少繳稅而故意不折舊，有些則僅僅是因為不知道需要折舊。然而，根據美國稅法，這可能會導致昂貴的代價。
1. 法律現實：折舊不是「選修課」，是「必修課」
根據美國稅法 (IRC)，折舊並不是一個選項，而是一項要求。法律遵循一個稱為**「允許或應允許」(Allowed or Allowable)** 的標準。
這意味著，當您未來賣掉房產計算資本利得稅時，IRS 會假設您已經拿了折舊（因為這是法律「允許」您拿的），並以此來計算您的稅金——即使您實際上從未申報過這筆抵扣。
後果是什麼？ 您可能要為一筆您從未享受過的稅務福利補繳稅款。
2. 為什麼不能直接「修改」過去的稅表？
如果您發現過去數年都漏了折舊，您的直覺可能是去修改過去每一年的稅表 (Amended Return, Form 1040-X)。
從法律上講，您通常不能這樣做。 IRS 有一條特定規則：如果您連續兩年或以上未折舊，您就被視為採用了一種特定的「會計方法」(Accounting Method)。
IRS 非常重視會計的一致性，因此不允許您通過修改舊稅表來「改寫歷史」（況且許多舊年份已經過了追溯期）。相反，您必須申請「更改會計方法」。
3. 解決方案：Form 3115 與 §481(a) 調整
要在法律上修正這個問題，我們需遵循 IRS 的程序提交 Form 3115（更改會計方法申請表）。
這份表格的作用是告訴 IRS：「我之前使用了不被允許的方法（不折舊），現在我想切換到被允許的方法（開始折舊）。」
修正數據的機制稱為 Section 481(a) 調整：
- 它會計算您過去所有年份本應申報的折舊總額。
- 法律允許您將這筆漏報的總額，在當年的稅表中作為一次性費用全額扣除，而不是讓這些抵扣額作廢。
- 只要符合自動變更規則，這種「補救」申報是完全合法的，無需等待 IRS 事先批准。
4. 重要提示：申報的時機
由於這是正式的會計方法變更，程序上的時間點非常嚴格。您通常無法在已經申報的稅表上修正此錯誤。
- 如果您尚未申報今年的稅表： 我們可以將 Form 3115 附在您的稅表中，並立即享受這筆大額抵扣。
- 如果您已經申報了今年的稅表： 您通常不能為了加報此表而簡單地修改稅表。IRS 一般不允許在修正稅表 (Amended Return) 中更改會計方法。我們通常必須等到明年，在下一年度的稅表中進行調整。
總結
- 法律規定： 折舊是強制的（Allowed or allowable）。忽略它會導致您賣房時吃虧。
- 修正方法： 不要修改舊稅表。我們必須提交 Form 3115 來更正會計方法。
- 稅務福利： 您通常可以在當年一次性扣除過去所有漏報的折舊，這將顯著降低您當年的應稅收入。
免責聲明：稅法複雜且隨時可能變更。本文僅供參考，不構成法律或稅務建議。每位納稅人的情況皆獨一無二。
