Going freelance in Japan

Going independent usually starts with one free form: the notification of business opening (開業届), filed with your tax office, which registers you as a sole proprietor. File it within about a month of starting, and submit the blue-return application (青色申告承認申請書) at the same time — that single extra form unlocks a deduction of up to ¥650,000, loss carry-forward, and family-salary deductions, in exchange for keeping proper double-entry books.

The blue return is the highest-leverage early decision, but it has conditions: the ¥650,000 tier needs double-entry books plus e-filing (or qualifying electronic books); paper filing drops it to ¥550,000, and simple records to ¥100,000. Cloud accounting removes most of the bookkeeping burden, so for anyone with steady income, choosing blue and letting software keep the books is the straightforward win.

Almost everything you owe flows from one number — business profit (revenue minus expenses) — then personal deductions reduce it to taxable income. On that you pay national income tax (progressive) and local resident tax (~10%). Alongside sit two social-insurance bills you now fund yourself: the National Pension (a flat monthly premium, ¥17,920/month for fiscal 2026) and National Health Insurance (income-based, set by your municipality).

The trap is timing. Resident tax and health-insurance premiums are based on last year’s income, so a strong year is followed by heavier bills — which blindsides many first-year freelancers. The defense is a tax reserve: move roughly 20–35% of each payment into a separate account as it arrives, higher as income grows. Confirm each year’s rates and deduction amounts, since recent reforms have moved the basic deduction and thresholds.

Consumption tax has a default and an override. By default you are an exempt business until taxable sales in the base period (two years earlier) exceed ¥10 million. The override is the invoice system: registering for a T-number makes you a taxable business even far below ¥10 million. So for most small freelancers the real question is not the threshold — it is whether to register at all.

That is a genuine trade-off keyed to your clients. If they are businesses that need qualified invoices to claim input credits, not registering can cost you work or push you to absorb tax — and the transitional credit for buyers from unregistered suppliers steps down from 80% to 50% in October 2026. If your clients are consumers or tax-exempt, registering may add cost for no benefit. Taxable businesses can soften the load with simplified taxation or the temporary 20% special measure, both date-sensitive and being revised — confirm your year with the NTA or a 税理士.

Two more systems complete the picture. Getting paid: issue clear invoices (with your T-number if registered), and expect certain fees to individuals — writing, design, lectures — to arrive with about 10.21% withheld at source. That withholding is a prepayment of income tax, so credit it on your return or you effectively pay twice. Closing the pension gap: the self-employed have a thinner public pension, so deductible schemes — small-business mutual aid (up to ¥840,000/yr), iDeCo with the National Pension Fund (up to ¥816,000/yr combined), and the cheap extra pension — build your own safety net while cutting taxable income.

Finally, the incorporation question. There is no magic number; you incorporate when stable, higher profit makes the corporate-tax advantage outweigh the added fixed costs and social-insurance duties, and usually when a non-tax reason also applies — hiring, raising money, or clients that will only bill a company. If you do incorporate, a godo-kaisha (GK) is cheaper and simpler than a kabushiki-kaisha (KK), and you can convert later. Model your own case with a tax accountant before deciding.