"Asset Tax Navi" Releases Osaka City Property Tax Overpayment Check Tool — Adds Diagnostic Features for 24-Ward Appraisal Trends

Mycat Inc. (Headquarters: Meguro-ku, Tokyo) has launched the "Osaka City Property Tax Overpayment Check Tool" as part of its property tax verification service, "Asset Tax Navi" (https://shisanzei.xyz). This new tool allows users to check the validity of property tax assessments specifically across the 24 wards of Osaka City.

Tool URL: https://shisanzei.xyz/tools/osaka-check

Tool Overview and Key Features

This is a free web-based tool designed for property owners in Osaka City to easily check the validity of the appraisal values listed in their annual property tax assessment notices.

Input Items (4 Steps):

• Step 1: Property Location ── Selection from Osaka City's 24 wards, and input of town name/chome.
• Step 2: Property Information ── Land area (㎡), building total floor area (㎡), building structure (Wood/Steel/RC/SRC), and building age.
• Step 3: Current Assessment Value ── Land appraisal value and building appraisal value as stated in the tax notice (estimates are acceptable).
• Step 4: Usage Confirmation ── Residential land (Small-scale/General), commercial land, or other.

Diagnostic Results Provided:

1. Appraisal Validity Score (4 levels: A to D)

The tool compares the entered appraisal value against official land prices and road ratings within the same ward to display a validity score. Property tax assessments are generally set at approximately 70% of the official land price; the score is calculated based on the degree of deviation from this benchmark.

2. Ward-Specific Appraisal Trend Report

Displays appraisal trends for the selected ward. For example, it provides notes on cases where changes in land-use zones affect appraisals in Chuo and Kita Wards (urban centers) or potential land price fluctuations due to Expo-related development in Suminoe and Konohana Wards (coastal areas).

3. Building Depreciation Check

Checks whether the age-based depreciation correction rates for the specific building structure are being applied correctly. For older condominiums (RC/SRC structures), there is a possibility that depreciation is not fully reflected in the tax notice; in such cases, it will be flagged as "Requires Verification."

4. Overpayment Risk Factor Analysis

If there is a potential for overpayment, the tool lists likely factors such as unreflected changes in land-use zones, failure to apply small-scale residential land exceptions, or insufficient depreciation adjustments.

Technical Features

The tool's appraisal check combines the following data sources and logic:

• Official Land Price Data: References annual data published by the Ministry of Land, Infrastructure, Transport and Tourism by ward.
• Road Rating Data: Regional road rating levels based on National Tax Agency maps.
• Depreciation Correction Tables: Correction rates by structure and age as defined in the Ministry of Internal Affairs and Communications' property appraisal standards.
• Residential Land Exception Determination: Application check for small-scale residential land (1/6 tax base for up to 200㎡) and general residential land (1/3 tax base).

Background on Property Tax Errors

According to a survey by the Ministry of Internal Affairs and Communications, property tax assessment errors have been confirmed in 97% of municipalities nationwide. Osaka City is no exception, making it crucial to verify if appraisal values are being adjusted appropriately during triennial reassessment years.

How to Use

1. Access the tool page (https://shisanzei.xyz/tools/osaka-check).

2. Enter data in 4 steps while referring to your property tax assessment notice.

3. Click the "Check" button for an immediate diagnostic result.