South Korea's 90% Income Tax Break for Young Hires at Small Companies — Your Employer Won't File It For You
Nearly half of young workers at their first job are having income tax withheld in full every month, even though a government tax break exists for exactly their situation. Most either don't know it exists, or know about it but miss the filing deadline. If you're a young worker at a small or medium-sized company (SME) in Korea, there's a program that cuts your income tax by 90% for five years — but it isn't applied automatically by your employer. You have to file the application yourself. Skip that one form, and you can quietly lose out on hundreds of thousands of won a year, adding up to millions over five years.
Who qualifies — two conditions, age and company size
The program is officially called the "SME Employee Income Tax Reduction." Two conditions apply. You must be between 15 and 34 years old as of the date your employment contract was signed, and you must be working at a company classified as an SME under the Restriction of Special Taxation Act. The age calculation is where people most often trip up: mandatory military service time is excluded from the age count, up to six years. If you served two years, you're still treated as 34 even if your actual age is 36. Only your age at the moment of hire matters — if you were 34 when you started, the benefit keeps running for the full five years even as you get older.
How much you save — 90%, but there's a cap
The reduction rate is 90% of income tax owed. It isn't unlimited, though: it's capped at 2 million won per year, and 10 million won total over the full five years. For early-career workers on modest salaries, the tax owed is often small enough that a 90% cut doesn't come close to the annual cap. As your salary rises with seniority, you can start bumping against that ceiling. The reduction applies through the month marking five years from your start date, then ends automatically.
The application isn't automatic — you have to file it yourself
This is the detail most people miss. The reduction isn't something your year-end tax settlement picks up on its own. You have to fill out an "SME Employee Income Tax Reduction Application" and submit it to your employer (the entity responsible for withholding your tax). The deadline is the last day of the month following the month you started work. Start on October 15, for example, and the form is due to your company's HR or general affairs team by November 30. The form is downloadable from the National Tax Service's Hometax site, and many companies keep copies on hand — it's worth asking HR about it on day one.
Missed the deadline? There's still a path
Missing the initial filing window right after you're hired doesn't close the door completely. Filing late still lets you claim the reduction going forward from that point in your withholding, and taxes you already overpaid can be recovered through your next year-end settlement or a request for correction (gyeongjeong cheongu) with the tax office. The longer you wait, though, the more of the earlier period falls outside what can be applied retroactively — so filing as soon as possible after starting is the better move. If you've already left a job where you missed this benefit, you can still check with your local tax office about filing a correction request.
Switching jobs doesn't reset it — but the five years is a single clock
One underrated feature of this program: it's forgiving of job changes. If you move to another SME while receiving the reduction, or leave and come back to the same company, the benefit carries over. You just file the same application form again at the new employer. The catch is that the five-year window doesn't restart with each job change — it's measured from your very first date of hire under the program. Leave after three years at one company and start at another, and only two years of reduction remain.
How to check if your employer actually counts as an SME
The second qualifying condition — whether your employer counts as an SME — is determined by the Enforcement Decree of the Restriction of Special Taxation Act, based on a combination of industry-specific revenue thresholds, employee headcount, and total assets. A company can look small and still be excluded if it's a subsidiary of a large conglomerate, or if it falls into certain excluded industries (finance and insurance, entertainment businesses, and a few others). Before you accept an offer, you can ask HR directly whether the company qualifies as an SME under this specific tax law, or look up the business registration number yourself through Hometax's SME status information system.
Don't confuse it with other youth programs
This income tax reduction is separate from — and can be combined with — other youth support programs like jeonse deposit loans or rent subsidies. Unlike the Youth Leap Account, which has income-based eligibility, this tax reduction only checks your employer's size and your age, so it doesn't disqualify you for earning more. Just don't confuse it with similarly named programs like the general "youth tax credit" or the "SME employment youth jeonse deposit loan" — the application forms and application windows are completely different.
Steps to follow
① Confirm you were between 15 and 34 at the time you were hired (military service time adds up to six extra years). ② Confirm your employer qualifies as an SME under the Restriction of Special Taxation Act, either through HR or Hometax. ③ Submit the "SME Employee Income Tax Reduction Application" to your employer by the last day of the month after you started. ④ If you missed the deadline, file now anyway, and check whether a correction request can recover tax you already overpaid. ⑤ If you change jobs, file the form again at the new employer — but remember the five-year window is measured from your very first qualifying hire date, not reset. If you're finishing up government-funded job training, this benefit is worth checking again once you land your first post-training job.
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