TaxNote's swipe-to-file bet tops Japan's tax apps for 29 straight days

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.

That Japan's solo workers want tax filing on a phone: swipe expenses, let AI pick the accounts, submit in-app — and will drop desktop software and accountants for it.

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.

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.

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.

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.

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.

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.

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.