The archive · Money & Fintech · Product decision · 2022–2026
TaxNote's swipe-to-file bet tops Japan's tax apps for 29 straight days
A nine-person Tokyo startup bet Japan's solo workers want to file taxes by swiping a phone; after a ¥1.3B Series A it held #1 among tax apps all filing season.
TaxNote (タックスナップ / 株式会社タックスナップ)
What the business is
TaxNote (タックスナップ) is a smartphone app that takes Japanese sole proprietors and side-income workers from daily expense entry to filed tax return: link a bank account, swipe or bulk-assign expenses, and the app's accountant-supervised AI sorts the books and prepares the return, with My Number card e-filing built in.
Starting capital：Cumulative funding about ¥1.6B (roughly US$11M) by Jan 2026: Series A of ¥1.3B led by World Innovation Lab (WiL), with bank loans from Mizuho and others; earlier rounds were smaller and stealthy.
How it started
Founder Yuta Tanaka failed toward sales at jigend, then worked at early VC Samurai Incubate watching startups from the seed stage. When he went freelance, back-office chores — pensions, insurance and especially the annual tax return — hit him as an absurd time sink. He found an overseas product that booked expenses by swiping, interviewed 60 sole proprietors in three weeks, and concluded the market was unresolved. He incorporated as TxTo in Nov 2022 and launched the app in Jul 2023.
What happened
The growth engine was the product itself plus TV: a first #1 in the App Store accounting category came on 2025-03-02, a stealth round followed in Feb 2025, and in Jan 2026 the company announced a ¥1.3B Series A (¥1.6B cumulative), led by WiL with Mizuho Bank loans. In the 2026 filing season (Feb 16–Mar 16) it was #1 among tax-filing apps for all 29 days and peaked at #7 in Finance overall; an actress-fronted TV campaign pushed the green logo nationwide. The whole operation runs on nine employees, with roughly 90% of business workflows automated, and registered members grew about 30x over two years to tens of thousands.
How it ended up
Still scaling as of Jun 2026: TaxNote is extending from filing into the full solo-worker value chain — business-opening filings, invoicing and cash-flow management — with product-led growth plus TV advertising, and says its next step is becoming 'social infrastructure' for people who work alone.
Background
TaxNote (タックスナップ) is a Tokyo fintech that sells one promise: 'tax filing without trying'. Aimed at Japan's fast-growing ranks of freelancers, side-hustlers and solo proprietors, the app links a bank account, turns expense entry into swipes and bulk auto-sorting, has tax-accountant-supervised AI choose the accounts, and completes filing and e-submission in the same phone session.
Founder Yuta Tanaka came from sales at jigend and seed investing at Samurai Incubate before going freelance, where Japan's annual tax ritual hit him as an absurd burden — a 2025 company survey put the economy-wide time cost near ¥188.7B, with 82.3% of filers calling it stressful and only 11.8% ever using an accounting app. After 60 interviews with sole proprietors in three weeks, he incorporated in Nov 2022 and launched in Jul 2023.
The product won by being measurably faster: an external Nov 2025 study clocked about 4x the expense entries of rival accounting software in the same time (roughly 18x handwriting, 40x Excel), and the 'dump-it-on-me' sorter files 1,000 receipts in about 3 seconds. It first hit #1 in the App Store accounting category on 2025-03-02, and during the 2026 filing period (Feb 16–Mar 16) it held #1 among tax-filing apps all 29 days, peaking at #7 in Finance overall.
In Jan 2026 TaxNote announced a ¥1.3B Series A (about ¥1.6B cumulative) led by World Innovation Lab with Mizuho Bank loans. The company runs the growth on nine employees, automating most workflows, and has moved from filing toward the whole solo-worker back office — business-opening filings, invoicing and cash flow — as of Jun 2026.
What has to be true
- The incumbents optimized for accountants and desktop power users; TaxNote optimized for the person who files alone every March and dreads it, which is where the unmet demand actually was.
- Speed was the demonstrable wedge: 4x the expense entries of rival software in the same time (18x handwriting, 40x Excel) is a claim users could feel in one session, not trust on faith.
- Phone-only completion removed the classic two-system tax chore: with My Number card e-filing in-app, there was no desktop portal to return to and no printer.
- A nine-person, AI-native organization with heavily automated workflows let the company spend on ranking position and TV reach instead of headcount.
- Tax filing is a repeating annual spike, which gave the app a natural acquisition moment: top-of-category rank during all 29 days of filing season converted search intent into installs.
What can be applied
A market looks settled only inside the incumbent's definition. TaxNote re-cut it by user (solo, non-accountant) and device (phone-only), then let a measurably faster core flow do the marketing.
Aftermath
As of 2026-06-26 TaxNote is scaling: registered members grew about 30x over two years to tens of thousands, the Series A is funding acquisition, features and hiring, and the roadmap reaches beyond filing into business-opening paperwork, invoicing and cash-flow management — the stated goal is 'social infrastructure' for Japan's solo workers. The main risk is desktop accounting giants and accountant platforms attacking the same mobile niche, plus re-earning the filing-season top rank every February.
Sources
- 【挑戦者・求む】なぜ2年でユーザー数30倍、たった9名のAI組織で13億円調達──「確定申告アプリ」から社会インフラへ
- タックスナップ、シリーズAラウンドで総額13億円の資金調達を実施。サービス強化を図る
- 確定申告アプリ「タックスナップ」が、2026年 確定申告期間の全29日間にわたりApp Storeランキング確定申告アプリ内1位を獲得
- 確定申告の“経済損失額”は約1,887億円！
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