What does 내돈내산 (naedonnaesan) mean? The Korean slang that became a “not sponsored” badge

Last week our editor saw an Instagram review of a cordless vacuum tagged #내돈내산 and added it to the cart. Just before paying, they spotted #협찬 (“sponsored”) buried among twenty hashtags at the bottom. They'd be buying it with their own money, sure. Whose money paid for the review was another question.

Our editor isn't alone. According to Fair Trade Commission data reported by Seoul Economic TV on October 21, undisclosed social-media ads — including ones dressed up as 내돈내산 reviews — topped 100,000 in five years. Today we trace how a four-syllable abbreviation became a certificate of trust, and how often that certificate gets forged.

In August 2020 Etoday glossed it as “something I bought with my own money,” a phrase YouTubers stressed when introducing products; Financial News gave the same reading in February 2023. It works two ways: as a hashtag (#내돈내산 후기, “self-bought review”) or in speech (“이거 내돈내산이야,” “I bought this myself”). These days it covers not just products but restaurants, salons and trips — anything you paid to experience.

• #내돈내산 3개월 써 본 무선 청소기 솔직 후기 (장단점 다 씀)#내돈내산 Honest review of a cordless vacuum after 3 months (pros AND cons)The textbook blog-review title
• 이 패딩 내돈내산이야. 협찬 아니고 진짜 따뜻해서 추천하는 거임This puffer's 내돈내산. Not sponsored — I'm recommending it because it's actually warm.Friends' group chat, boosting a recommendation's credibility
• 슬세권 카페 내돈내산 투어 다녀왔습니다Did a 내돈내산 tour of cafés within slipper distance.A neighborhood café-hopping post
• 내돈내산이라더니 맨 밑에 #광고가 숨어 있었네Said 내돈내산, but there's an #ad hiding at the very bottom.A common twist in the comments
• 내돈내산? 내 돈 내가 산다는 거면 당연한 거 아니냐내돈내산? If you buy things with your own money, isn't that just… normal?Dad (hasn't met the concept of sponsorship yet)

It started on social media awash in sponsorships. With every review suspected of being paid, YouTubers and influencers began tagging posts with this phrase to say “I bought this myself.” Where sponsorship is the norm, not being sponsored becomes a selling point of its own.

The word got heavier in the summer of 2020. According to Etoday, after a streamer's revelations on a live broadcast in early August, popular food and beauty YouTubers posted apology videos one after another, admitting they'd taken money for content without disclosing it; some quit. As cases surfaced of creators claiming 내돈내산 while actually being paid, the four syllables became both a sign of trust and a target of suspicion.

One: there were too many ads. When every search for reviews turns up sponsored ones, what shoppers need most isn't information but an answer to “did this person get paid?” 내돈내산 answers that in four syllables, up front.

Two: the hidden-ad scandal raised the stakes. Etoday argued the 2020 backlash was especially fierce because, unlike celebrities wearing sponsored clothes on TV, YouTubers had deliberately hidden the ads, turning viewers' sense of closeness and trust into betrayal. From September 1, 2020, the FTC's revised guidelines required paid endorsements to be labeled as ads. Once the rule existed, a label saying you were outside it became more valuable.

Three: platforms made room for it. As a searchable four-syllable hashtag, it fits blog titles, Instagram tags and shopping reviews alike. And like 꾸안꾸, another first-syllable abbreviation, it's easy to unpack once you've heard it.

On October 21, Seoul Economic TV reported data that Rep. Park Sung-hoon (People Power Party), a member of the National Assembly's National Policy Committee, obtained from the Fair Trade Commission. FTC monitoring flagged 108,709 undisclosed-ad posts on social media from 2021 through 2025. The headline itself referred to hidden ads “disguised as 내돈내산.”

By sector, in 2025 “other services” such as restaurants and hair salons led with 5,791 cases (25.5%), followed by clothing, textiles and personal goods (3,725) and health and hygiene products (3,500). That works out to a little over 60 a day — meaning that while our editor was choosing lunch, a not-really-내돈내산 review was going up somewhere.

Not necessarily. In November 2025, KBS reported on a company that refunded customers the price of a product if they posted a 내돈내산 review — effectively paying for it. Pay first, get refunded later, and it's 내돈내산 in form and an ad in substance. In the end, what matters more than the four syllables is whether the review lists the downsides, and what's hiding in the hashtags at the bottom.

So 내돈내산 is a four-syllable guarantee that a review can be trusted. The trouble is that guarantees get forged. Our editor took the vacuum out of the cart and is now looking for a review with at least three lines of complaints. If you have a sharper definition, add it to the 내돈내산 entry in the dictionary.