Understanding Taiwan’s CPI-Adjustment for Inherited or Gifted Old Regime Houses

What Has Changed

On 15 July 2026, Taiwan's Ministry of Finance (MOF) released an explanatory order (台財稅字第11504549440號令) that allows individuals selling old-regime houses obtained by inheritance or gift to apply a consumer price index (CPI) adjustment to the assessed value at inheritance or gift in calculating taxable gains.(mof.gov.tw)

Previously, only houses falling under Taiwan’s new House-Land Combination (“房地合一”) tax regime could benefit from CPI adjustments in determining the value at inheritance or gift. Old-regime houses—those outside the new combined tax regime—did not have this benefit. This clarification enhances equity and reduces inflation-driven artificial gains.(mof.gov.tw)

How It Works in Practice

Here’s the new mechanism:

• When it applies: For individuals selling an old-regime house obtained by inheritance or gift, if actual sale price or tax authority-verified transaction price is available. Otherwise the standard old-regime valuation rules continue.(mof.gov.tw)
• Adjustment formula:
  1. Determine the “evaluated value” of the house at the time of inheritance or gift.
  2. Adjust that value by the ratio of the CPI for the sale month over the CPI for the inheritance/gift month.
  3. Deduct that adjusted basis, plus acquisition/improvement/transfer costs, from sale price to arrive at taxable gain.(mof.gov.tw)

Example Scenario

• A property was inherited in July 2010 when its assessed valuation was NT$5,000,000.
• It sold in July 2026 for NT$8,000,000.
• CPI in July 2010 = 90; CPI in July 2026 = 135 (illustrative numbers).
• Adjusted inherited value = 5,000,000 × (135/90) = NT$7,500,000.
• Assume NT$200,000 in documented improvement costs and NT$100,000 in legal/transfer fees.
• Taxable gain = Sale price (8,000,000) − Adjusted basis (7,500,000 + 200,000 + 100,000) = NT$200,000. Without CPI adjustment, taxable gain would be 8,000,000 − (5,000,000 + costs) = NT$2,800,000—a much higher tax burden.(mof.gov.tw)

Who Benefits & Potential Pitfalls

Beneficiaries

• Individuals selling inherited or gifted property under old regime (i.e. outside “房地合一新制”).
• Estates and heirs subject to capital gains on real property transactions.
• Those whose inheritance/gift dates are far in the past—where inflation has significantly increased since.

Drawbacks / Considerations

• Must be able to prove assessed value at time of inheritance/gift and current CPI figures.
• If actual sale/proof of original assessment missing, benefit may be limited—or use other valuation methods.
• Other gains (e.g. improvements costs) still need proper documentation.

Compliance Steps

• Gather records of inheritance/gift date, assessed valuation or appraisal, and improvements/transfer costs.
• Obtain CPI series for relevant months (MOF publishes these).
• If sale price is verified by tax authorities, ensure full documentation to support claim under regulation.
• When filing, attach the explanatory order and explanation in your calculation to reduce risk of audit adjustments.

Strategic Real Estate Tax Planning

• Families holding inherited or gifted homes may delay sale to benefit from cumulative inflation adjustments.
• When planning improvements or transfers, document carefully—costs in improvement and transfer matter.
• Consider now whether shifting property into new-regime (“房地合一”) status offers better long-term tax outcomes. But note old regime benefits for inheritance/gift with CPI adjustment may narrow any perceived advantage of switching.

Conclusion

Taiwan’s new clarification makes old-regime real property taxation fairer by recognizing inflation’s effect on inherited or gifted properties. Whether you are an individual heir or a real estate investor, careful documentation and understanding of CPI adjustments can deliver meaningful savings.