Online information surrounding the launch date of the year-end tax settlement preview service for income attributable to 2026 is presenting different dates. As of October 9, no official announcement from the National Tax Service (NTS) regarding this year's preview service launch schedule has been confirmed. Nevertheless, some blogs and information sites have already posted definitive guidance stating that the service will be 'available from November 2026.' Conflicting launch date information... Discrepancies begin with last year's records. The confusion starts with the record of last year's launch date. The NTS opened the year-end tax settlement preview service for income attributable to 2025 on November 5. However, one information site stated that the same service opened on November 15, a difference of exactly ten days. Some posts also describe the service period as 'from October every year.' The service's end date is also circulating without being clearly established. One site stated that the preview can be used until January 31 of the following year, while another post explained that it is provided until December 24. Which of the two pieces of information matches this year's criteria cannot be known until the NTS makes an official announcement. Service framework and tailored guidance outlined by the NTS. The structure of the preview service, as explained by the NTS last year, is clear. It calculates the estimated tax amount for the following January's year-end settlement by pulling credit and check card spending from January through September and deduction amounts reported in the previous year's settlement. Along with this, the NTS selected 520,000 workers considered highly likely to meet deduction requirements and sent tailored guidance via KakaoTalk starting November 6. However, the NTS also noted the limitations of the preview results at the time. Because the analysis point of the tailored guidance differs from the actual year-end settlement point, some items may not qualify for deductions as of year-end. This means the preview is not a final result but a predictive tool for planning year-end spending. Concerns that incorrect date information may cause confusion in year-end financial planning. The year-end settlement schedule is directly tied to workers' year-end spending and savings plans. For items such as income deductions for card spending or pension account contributions, where the timing of spending within the year determines eligibility for deductions, many workers plan around the launch of the preview service. If incorrect date information is repeatedly exposed, it could cause confusion in judging when to use the service. [This article was written by comparing the NTS's announcement on the 2025 year-end tax settlement preview with publicly available online guidance. The schedule and content of the service for income attributable to 2026 may be finalized or changed according to the NTS's official announcement. AI provided partial assistance.]