Check the Company Schedule and Income Year First
The year-end tax settlement carried out at the beginning of 2026 reconciles employment income received in 2025. Check the submission deadline set by your company, and if you changed jobs, make sure your withholding tax receipt from your previous employer has been included.
Simplified Tax Data Is Not the Final Answer
The Hometax simplified service collects and displays documents, but it does not determine every deduction requirement. You may need to obtain missing documents from the issuing institution, and you should not submit items that are not eligible for a deduction.
Check Dependents’ Income, Age, and Duplicate Claims
To include a family member as a basic deduction dependent, you must check not only the relationship but also the income and age requirements for that year. Be careful not to have siblings each claim the same parent or register a family member without checking their income.
The Eligible Person Matters for Medical, Education, and Insurance Expenses
Even the same expense may or may not qualify for a deduction depending on whom it was paid for and who actually bore the cost. Do not simply copy the amounts shown on the screen; also check the eligible persons and excluded items in the National Tax Service guidance.
Check Contract and Household Requirements for Housing Deductions
Rent, housing lease loans, long-term mortgage loans, and housing savings each have different requirements regarding home ownership, household head or member status, housing standards, and the identity of the contracting and paying party. Check the requirements separately for each item that applies to you.
Final Check Before Submission
Check your previous employer’s income, duplicate dependent claims, and receipts missing from the simplified service in order. If you discover an omission after the year-end tax settlement, review the National Tax Service guidance to see whether it can be corrected through an annual income tax return or a request for correction.