Same ₩600K rent, one gets a ₩1.22M rent credit and the desk neighbor gets ₩0 — the difference was the claim, not the rules

An employee pays ₩600K a month in rent. At year-end tax adjustment, the rent credit cuts their tax by ₩1.22M, which is two months' rent. The colleague at the next desk pays exactly the same rent and gets ₩0 in rent credit. The rules were not different; they simply never claimed. The colleague still gets the ₩130K standard tax credit, so the real gap between them is ₩1.094M. The rent tax credit is not applied automatically. It is calculated only for people who submit the papers and claim it. And the past five years you missed can still be recovered today.

The basis is Article 95-2 of the Restriction of Special Taxation Act, where the conditions, rates and caps are all written as numbers. Four steps: who qualifies, how much, why people miss it, and how to recover missed years. And one thing changed this year: a spouse at a different address can now claim an additional credit.

Step one: three layers of conditions. The person must be head of a household that owns no home as of the last day of the tax year, and an employee with total salary of ₩80M or less. If the household head claims no housing-related deductions a household member can claim instead, and registered foreigners qualify if they meet the conditions. 'No home' is judged for the entire household, not you alone. The home must be national-housing size or smaller, or a standard value of ₩400M or less; officetels and gosiwons count, and households with three or more children or grandchildren got a relaxation to 100㎡ this year. As for the papers, the address on the lease must match your resident registration, meaning you must have registered your move-in. The lease can be in your name or that of a family member who is your basic-deduction dependent.

Step two: the amount. Total salary sets the rate: 17% up to ₩55M, 15% above ₩55M up to ₩80M. Eligible rent is capped at ₩10M a year. With a ₩50M salary and ₩600K rent, annual rent of ₩7.2M × 17% = ₩1.224M. With a ₩60M salary the rate is 15%, ₩1.08M. If annual rent exceeds ₩10M (₩900K a month, say), only ₩10M counts, so the maximum credit is ₩10M × 17% = ₩1.7M.

This is a tax credit. Unlike an income deduction that shrinks the tax base, it subtracts the amount straight from the tax already calculated. There is one limit: you cannot get back more than the tax you owe. Someone with a computed tax of ₩300K sees it fall only to zero even if the credit available is ₩1M. If your income carries almost no tax, the credit is worth correspondingly less. One more point: an employee who claims no special credits at all (rent, insurance, medical, education) gets a ₩130K standard tax credit (소득세법 제59조의4 제9항 제1호). Claiming the rent credit removes that ₩130K, so the gain is the credit minus ₩130K: at ₩600K rent on a ₩50M salary, ₩1.224M − ₩130K = ₩1.094M. Anyone already claiming another special credit loses the ₩130K anyway, so the full ₩1.224M is added.

Step three: the reasons eligible people miss out come down to a few. First, they never registered their move-in. If the lease address and the registered address differ, the condition itself collapses. Second, they worry about the landlord. But this credit needs no landlord consent; the lease, your resident registration and bank transfer records are enough. Third, they did not know or found the paperwork tedious. All it takes is handing your employer a copy of the lease and transfer history at year-end, and they skip that one step. Fourth, they assume they do not qualify. Officetel and gosiwon residents, or a lease signed by a basic-deduction dependent rather than yourself, sometimes qualify once checked against the table. At ₩600K rent on a ₩50M salary, a single claim is worth ₩1.094M even after losing the ₩130K standard credit.

Step four: if you paid rent last year and the year before without knowing about the credit, it is not over. An amended-return claim asks the tax office to correct a filing that was wrong or incomplete, and it is allowed within 5 years of the statutory filing deadline. From today that reaches back through the last five year-end adjustments, provided you met the conditions in each year. On Hometax, open the amended-return menu, attach that year's lease and transfer records, and the refund lands in your account after processing. The amount is not the same every year: rates, caps and salary lines follow that year's law. At ₩600K rent on a ₩50M salary it is ₩1.224M a year from the 2022 tax year (the 17% rate reached 2022 adjustments through Addendum Art. 18 of the 2022-12-31 amendment) and ₩864K for 2021, when the rate was 12%. If you received the standard tax credit that year because you claimed no other special credits, that amount comes off the refund. Each year's salary and no-home conditions are also judged for that year. An amended-return claim is a right, and it brings no penalties and no disadvantage.

One more thing, new this year. The credit used to be for the household head alone, but the law was amended (Art. 95-2(2), added 2025-12-23) so that the head's spouse can also claim an additional credit if they meet the conditions. The key condition is a different address: the spouse must live in a different city, county or district from the head. A couple living apart on weekdays because of work is exactly this picture. The combined cap stays at ₩10M a year, so the spouse uses whatever the head leaves unused, and the spouse must still meet the original conditions such as owning no home. The Decree adds further details, so check the table carefully if this applies to you.

Three things to do now. If you rent but have not registered your move-in, do that first, because it is the door to eligibility. For rent paid in 2026, submit a copy of the lease and your transfer history at the January to February 2027 year-end adjustment (the 2026 tax year); the spouse credit also first applies there, since it covers rent paid from 2026. Count whether any of the past 5 years were missed, and if so file an amended-return claim on Hometax. Borderline situations such as household composition or the home's standard value differ from person to person, so when in doubt confirm with the tax office or a tax adviser. The ₩1.094M gap between you and the next desk came down to one bundle of papers, not income or luck.