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成本基础调整(Cost Basis Adjustment)

Published May 20, 2024Updated Mar 22, 2026

What Is 成本基础调整(Cost Basis Adjustment)?

你的物业成本基础不等于你当初的购买价格——它是一个动态数字。每次做资本性改良(更换屋顶、翻新厨房)时,成本基础上升;每年申报折旧时,成本基础下降。出售时,IRS用调整后的成本基础来计算你的应税利润(资本利得)。成本基础越高,应税利润越低,税负越少。这就是为什么保留所有改良项目的收据至关重要。

成本基础调整(Cost Basis Adjustment)是指在计算投资物业出售时的应税利润时,对原始购买价格进行加减调整的过程——增加的部分(如资本性改良)提高成本基础,减少的部分(如累计折旧)降低成本基础。

At a Glance

  • 定义: 对物业原始购买价格进行加减调整,以计算出售时的应税利润
  • 重要性: 直接决定出售物业时的资本利得税金额
  • 关键细节: 资本性改良调增基础,累计折旧调减基础
  • 相关概念: 折旧1031置换密切相关
  • 注意事项: 日常维修不能调增成本基础,只有资本性改良才可以

How It Works

起点:原始成本基础。 你的初始成本基础 = 购买价格 + 购买时的过户费用(产权保险、律师费、过户税等)。注意:贷款利息和物业税不计入成本基础。

调增项:资本性改良。 延长物业使用寿命或增加价值的支出可以调增成本基础。常见例子:更换屋顶($8,000-$15,000)、暖通系统更换($5,000-$10,000)、厨房全面翻新($15,000-$30,000)、加建房间或车库。关键区分:这些是"改良"(Improvement),不是"维修"(Repair)。换一个水龙头是维修,不调增基础;换整套管线是改良,调增基础。

调减项:累计折旧。 每年你申报的折旧扣除会降低成本基础。住宅出租物业按27.5年直线折旧。持有10年后,累计折旧可能已经让你的成本基础下降了36%以上。出售时,IRS会按25%的税率对折旧回收部分(Depreciation Recapture)征税——无论你是否实际申报了折旧。

计算公式。 调整后成本基础 = 购买价格 + 过户费用 + 资本性改良 - 累计折旧。应税资本利得 = 出售价格 - 出售费用 - 调整后成本基础。

Real-World Example

张先生(Zhang)10年前以$300,000买入Dallas一套出租物业。购买时过户费用$8,500。持有期间做了以下资本性改良:更换屋顶$12,000、暖通系统更换$7,500、浴室翻新$9,000。10年累计折旧:$300,000 × (10/27.5) = 约$109,000。

调整后成本基础 = $300,000 + $8,500 + $28,500 - $109,000 = $228,000。

他以$450,000出售,出售费用(经纪佣金+过户费)$31,500。应税资本利得 = $450,000 - $31,500 - $228,000 = $190,500。

如果张先生没有保留改良项目的收据($28,500),他的成本基础会低$28,500,应税利润会高$28,500。按联邦长期资本利得税率15%计算,这意味着多缴$4,275的税。

Pros & Cons

Advantages
  • 合法降低出售投资物业时的应税利润
  • 激励投资者做资本性改良,同时提升物业价值
  • 1031置换配合使用,可以进一步延期纳税
  • 准确的成本基础记录让你在出售时拥有更多税务规划空间
Drawbacks
  • 记录保存要求严格——必须保留所有改良项目的发票和收据
  • 日常维修和资本性改良的区分在某些情况下存在灰色地带
  • 累计折旧会持续降低成本基础,出售时的折旧回收税可能超出预期
  • 需要与专业税务顾问合作才能确保计算准确

Watch Out

  • 记录保存: 保留每一笔资本性改良的发票、合同和付款记录,最好用数字化方式备份
  • 维修vs.改良的界定: IRS对这两者的区分有具体指南(IRS Publication 527),模糊情况下建议咨询CPA
  • 折旧回收: 即使你从未申报过折旧,IRS在计算出售税负时仍会假设你"应该"申报了——所以一定要每年申报折旧

Ask an Investor

The Takeaway

成本基础调整是投资物业税务规划中最重要的概念之一。每一笔资本性改良都在为你未来的出售减税铺路,每一年的折旧扣除都在降低你的成本基础。保持完整的记录、区分维修与改良、每年申报折旧——这三个习惯能在出售时帮你省下数千甚至数万美元的税。

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