Note: This article was automatically translated from Korean by AI. All content refers to South Korea unless otherwise stated. See Korean original for the most accurate reading.
When you buy a new phone through a carrier in South Korea, the store clerk always asks the same question: subsidy or plan discount? The answer comes down to one line of multiplication, not gut feeling. If the carrier subsidy does not exceed six times your monthly plan fee, the 25% plan discount over 24 months wins. On a KRW 89,000 (~USD 640) monthly plan, the break-even line is KRW 534,000 (~USD 384). (As of 2026-09-30)
This article compares Korea’s two mobile discount systems using public figures: the common subsidy (gongtong jiwongeum, formerly the “public subsidy”), which cuts the handset price once, and the selective contract discount (seontaek yakjeong, also called the “plan discount”), which takes 25% off your bill every month. The Mobile Device Distribution Improvement Act (known as the “Danthongbeop”), which had governed this structure since 2014, was repealed on July 22, 2025, and a year has now passed. We look at what changed and what did not.
The one-line formula: the subsidy must exceed 6× your monthly fee
The plan discount takes 25% off your monthly fee for 24 months. The total discount is monthly fee × 0.25 × 24 = monthly fee × 6. The common subsidy is a one-time payment at activation. So comparing the two comes down to comparing the subsidy amount with your monthly fee × 6.
For example, if you use a KRW 55,000 plan and are offered a KRW 250,000 subsidy, the total plan discount is KRW 330,000, so the plan discount leads by KRW 80,000. If the same person is offered a KRW 400,000 subsidy, the subsidy leads by KRW 70,000. One formula lets you work it out in your head at the counter.
Note that this formula assumes you keep the same plan for all 24 months in both cases. We treat separately below the cases where the subsidy is conditional on a pricier plan for a few months.
What changed and what stayed the same after the Danthongbeop repeal
According to an announcement by Korea’s Ministry of Science and ICT (Korea Policy Briefing), three things changed from July 22, 2025. Carriers’ obligation to publish subsidies ended, the cap on the additional subsidy that dealers and retailers can add (15% of the published subsidy) was lifted, and customers who choose the plan discount can now also receive the retailer’s additional subsidy. Previously, choosing the plan discount meant giving up the additional subsidy.
The core rule stays the same. People who do not take a common subsidy from the carrier still get the 25% plan discount. In other words, the common subsidy and the 25% plan discount remain an either/or choice. The only thing you can stack is the retailer’s additional subsidy. If a store tells you that you can get both, ask exactly which two things are being combined. Korea’s amended Telecommunications Business Act requires the payer and conditions of a subsidy to be spelled out in the contract.
Assessments one year on are mixed. An analysis cited in a ZDNet Korea report (2026-08-03) argued that with mandatory disclosure gone, “opaque subsidies” have grown, with large payouts concentrated on subscribers to high-priced plans. Carriers voluntarily post their subsidies on their websites, but retailers’ additional subsidies differ from store to store.
Run the numbers by plan and the break-even line appears
The table below calculates the 24-month total plan discount for each monthly fee. The right-hand column is the break-even subsidy. If the common subsidy you are offered (the carrier’s share) is smaller than this amount, the plan discount is the better deal.
| Monthly plan (KRW) | Monthly discount (25%) | 24-month total discount = break-even subsidy |
|---|---|---|
| 33,000 | 8,250 | 198,000 |
| 55,000 | 13,750 | 330,000 |
| 69,000 | 17,250 | 414,000 |
| 89,000 | 22,250 | 534,000 |
| 109,000 | 27,250 | 654,000 |
| 130,000 | 32,500 | 780,000 |
The plan prices are illustrative tiers for calculation. Actual plan names and monthly fees differ by carrier and must be checked on each carrier’s website. The table shows one structural point: the pricier the plan, the faster the plan discount’s value grows. For a KRW 130,000 plan, the break-even subsidy is KRW 780,000 (~USD 561).
Plugging in the Galaxy S26 launch subsidies
During pre-orders for the Galaxy S26, Samsung’s first flagship after the Danthongbeop repeal, the common subsidy from Korea’s three carriers was KRW 230,000 to 250,000 at most, according to a report by The Elec (2026-02-27). KT, the highest, offered KRW 250,000 on the top-tier plan, plus a KRW 37,500 additional subsidy, for a total of KRW 287,500. Even with the cap on additional subsidies gone, it effectively kept the old 15% standard.
Top-tier plans carry high monthly fees. Put in KRW 130,000 a month and the plan discount totals KRW 780,000, about KRW 490,000 more than the KRW 287,500 subsidy total. And since choosing the plan discount now also lets you receive the retailer’s additional subsidy, the gap can widen further. For a KRW 250,000 subsidy to beat the plan discount, your monthly fee would have to be about KRW 41,700 or less, and such low-priced plans do not usually carry the top subsidy. That is where the conclusion comes from: right after launch, the plan discount is the better deal for most new flagships.
When the subsidy does win
There are real cases where the subsidy exceeds six times the monthly fee. As industry explanations cited by The Elec note, subsidies tend to start low at launch and rise when inventory builds up or sales slow. A big subsidy on a model a year past launch, or one being cleared from stock, can beat the plan discount for people on low-priced plans.
The second case is when a plan-maintenance condition is attached. Say you receive a KRW 450,000 subsidy, but must use a KRW 109,000 plan for 6 months and then drop to KRW 55,000. Your 24-month phone bill on the subsidy side is KRW 109,000×6 + KRW 55,000×18 = KRW 1,644,000, and after subtracting the KRW 450,000 subsidy you get KRW 1,194,000. If you instead put the plan discount on a KRW 55,000 plan from the start, your 24-month bill is KRW 990,000. In this example, even though the subsidy looks large, the plan discount is KRW 204,000 cheaper. A few months on a pricey plan eat into the subsidy.
The third case is someone who will change phones within about a year. If you cancel within a set period after taking a subsidy, you must return part of it, and if you cancel a plan discount early you also return part of the discount received. Either way, the shorter you keep the phone the more the math changes, so check the return terms in the contract first. If you are curious about lowering the bill itself while staying on the same network, why budget MVNO plans cost half as much is also worth a look.
The 24-month contract trap and the 12.3 million people who missed the discount
You can choose a 12-month or 24-month plan discount, with the same 25% rate. The difference is the discount refund you pay on early cancellation. According to audit data cited in a Digital Daily report (2024-10-02), on a KRW 100,000 plan the refund was at most KRW 100,000 for a 12-month contract and at most KRW 200,000 for a 24-month contract. If you cancel after 9 months, the 12-month contract leaves you an actual benefit of KRW 150,000, while the 24-month contract leaves only KRW 37,500.
The bigger loss comes after the contract ends. The plan discount does not renew automatically on expiry. According to a Sisa Journal report (2024-09-24), as of the end of August 2024 about 12.3 million subscribers who were eligible for the plan discount had not signed up, and the discount they could have received was estimated at about KRW 1.3837 trillion (~USD 1 billion). About 6.73 million of them had been without a contract for more than a year. The longer you keep using the same phone, the easier it is to miss the 25%.
That is why the strategy of signing two consecutive 12-month contracts comes up often. The refund risk is small and the discount is the same. The trade-off is that you must remember to re-enroll every 12 months. Working out a fixed monthly cost in numbers follows the same logic as the Coupang WOW membership break-even calculation.
Frequently asked questions
Q. Can unlocked (jagupje) or used phones also get the 25% discount?
Yes. You can enroll in the plan discount if the device did not receive a carrier subsidy, or if it did but that contract period has ended. You can check whether your device is eligible on Smart Choice, Korea’s telecom fee information portal.
Q. Does the discount continue automatically after the contract ends?
No. You have to enroll again after it expires. Carriers send notification texts before and after expiry, but as the statistic of more than 10 million people without a contract shows, it is easy to miss. Writing the expiry date on your calendar is the surest way.
Q. Should I choose 12 months or 24 months?
The discount rate is the same. If there is any chance you will cancel early, the 12-month option has a smaller refund burden. Conversely, if you worry about forgetting to re-enroll and will not cancel within two years, 24 months is not a loss either.
Q. Will the 25% discount continue?
It is currently maintained. However, the analysis ZDNet Korea cited points out that with the Danthongbeop repealed, the legal basis for the plan discount has weakened and there is no guarantee that the rate will be kept. It is safer to check for any rule changes once more before you activate.
Summary
Ask the store two questions. First, how much is the carrier’s common subsidy? Second, how much is the retailer’s additional subsidy if you choose the plan discount? Then multiply your monthly fee by 6 and compare it with the common subsidy. If the subsidy is smaller, take the plan discount; if larger, take the subsidy. If a plan-maintenance condition is attached, add the fee difference for that period and recalculate. One multiplication can swing two years of phone bills by hundreds of thousands of won.