Jonny04

Based on his content signals — including hashtags like #シンガポール, #海外生活 (overseas life), and references to Singapore-specific shops like FairPrice and Donki — Jonny04 appears to be based in Singapore as a Japanese expat. This overseas perspective heavily shapes his personal finance and lifestyle content, including videos on expat salary arrangements and day-to-day life abroad.

Jonny04 works as a manager (管理職) at an IT company, and he runs his YouTube channel as a side project alongside that career. He's open about this dual life in his channel description, positioning himself as a working professional who shares investing knowledge rather than a full-time content creator.

Jonny04 began investing back in 2005, giving him roughly two decades of hands-on market experience before he ever started posting finance videos. He began taking YouTube seriously in 2019, so his content draws on well over a decade of real investing history rather than purely theoretical knowledge.

Yes — Jonny04 has created content specifically about iDeCo, including a YouTube Short walking through what happens if you start contributing at age 20 and run the account all the way to 65. It's one of the more concrete, numbers-driven examples of his approach to breaking down Japanese tax-advantaged investment accounts for everyday viewers.

Yes, Jonny04 has tackled the so-called "urban legend" of expat workers (駐在員) receiving salary from both a Japanese parent company and a local overseas subsidiary at the same time. Content like this reflects his Singapore expat perspective and makes his channel particularly useful for Japanese professionals working abroad.

He does — one of his videos applies簿記 (Japanese bookkeeping) concepts to personal household finances, which is a fairly distinctive angle in the personal finance YouTube space. Rather than generic budgeting advice, he frames family money management through the same accounting lens used in business.

Yes, he's covered specific and often overlooked Japanese tax tips, including the fact that ceramic dental treatments — which aren't covered by health insurance — can still qualify for 医療費控除 (medical expense deductions). These short-form tax tips appear to be a recurring format on his channel, aimed at helping viewers maximize deductions they didn't know existed.

Investing and personal finance are his core focus, but his channel description explicitly lists F1 racing, gadgets, gaming, and travel as additional interests he covers. Apple products like the MacBook Air appear among his gadget content, reflecting his background as an IT professional.

As of mid-2026, the channel has not seen a new upload in several years, making it effectively dormant. Despite the inactivity, his existing videos on iDeCo, Japanese tax deductions, and expat finance continue to attract a niche audience, which is reflected in his above-average engagement rate for a channel his size.

Jonny04's YouTube channel sits in the Micro tier, with just over 12,000 subscribers. What stands out is that his engagement rate runs more than double the typical category median for channels his size, suggesting a loyal and genuinely interested core audience despite the relatively modest subscriber count.