Going Freelance in Japan: The Kaigyo Todoke and Self-Employment Basics
Updated: 2026-08-30
Quick answer: what starting a solo business really involves
If you're thinking about freelancing or running a small solo business in Japan, the short version is this: you tell the tax office you've started, you keep clean records, you invoice your clients properly, and you quietly set money aside for taxes and insurance that won't be deducted for you anymore. None of it is dramatic, but it does reward planning ahead.
The main document people talk about is the kaigyo todoke, the notification of a new business you file with the tax office. Alongside it, many freelancers choose the blue-return (aoiro) filing method because it encourages tidy bookkeeping. In this guide I'll map out the pieces and the order they usually come in, so the process feels like a checklist rather than a mystery.
One important note before we start: I'm here to help you plan and understand the steps, not to give you tax or legal advice. Rules differ by situation, and figures change, so for anything specific I'll keep pointing you toward the National Tax Agency's official guidance or a qualified tax professional.
Check first: does your status allow self-employment?
Before filing anything, it's worth confirming that your residence status actually permits independent, self-employed work. Some statuses allow it freely, some allow it only with permission, and some are tied to a specific employer. This isn't something to guess at, because working outside what your status permits can have serious consequences.
I won't try to tell you what your particular status allows, because immigration matters are individual and I don't want to steer you wrong. Instead, check the official Immigration Services Agency guidance, or speak with a professional who handles visa questions, before you commit to going solo.
Getting this confirmation early saves a lot of stress later. Once you know self-employment is genuinely open to you, the rest of the setup becomes a calm, practical to-do list rather than a source of worry.
Filing the kaigyo todoke with your tax office
The kaigyo todoke is the notification that tells your local tax office you've begun a business. It's a relatively simple form where you describe what your business does and when it started. Many people file it soon after they actually begin working, and it's the natural first administrative step of going freelance.
You typically submit it to the tax office that covers your address, and you can often do this in person or through the national e-filing system. If you plan to use the blue-return method I'll describe next, there's usually a separate application for that which people often submit around the same time, so it's worth preparing both together.
Because the exact forms, deadlines, and where-to-submit details can change, I'll point you to the National Tax Agency rather than quote specifics here. Reading their current guidance, or asking a tax professional to check your forms, is the safest way to get this right the first time.
Blue-return filing and why bookkeeping matters
The blue-return, or aoiro, filing method is a way of filing your income taxes that comes with certain advantages in exchange for keeping proper books. The trade-off is that you need to record your income and expenses in an organized, consistent way throughout the year rather than scrambling at tax time.
That bookkeeping habit is genuinely the heart of a healthy solo business. When you log each sale and expense as it happens, filing season becomes a review rather than a rescue mission, and you always have a clear picture of how the business is actually doing. Many freelancers use accounting software to make this routine painless.
Whether the blue-return method suits you, and what conditions apply, is exactly the kind of thing to confirm with the National Tax Agency's materials or a tax professional. I'd rather you hear the specifics from an authoritative source than take a rough summary from me.
Invoicing clients and setting money aside
When you work for yourself, invoicing becomes your responsibility. A clear invoice generally states who you are, who the client is, what you did, the date, and how much you're charging, so both sides have a clean record. Keeping copies of every invoice you send also feeds directly into the bookkeeping we just talked about.
The other habit that separates smooth years from stressful ones is setting money aside. As an employee, various taxes and contributions were handled for you; as a freelancer, you'll want to reserve part of what you earn for income tax, resident tax, national health insurance, and pension. Treating a portion of each payment as 'not really mine yet' keeps you from being surprised when bills arrive.
I'm deliberately not naming any figures, because rates and thresholds depend on your situation and change over time. For how much to reserve and how the invoicing rules apply to you, the National Tax Agency and a tax professional are the right people to ask.
Why an active Japanese number ties it all together
Once you've filed, set up your books, and started invoicing, you'll notice how much of running a solo business now lives online. Business registration through the e-filing portal, logging into invoicing and accounting tools, and confirming your identity all tend to lean on your phone at some point in the flow.
Those systems very often verify your login by sending a code to your number, so an active Japanese mobile number quietly becomes part of your business infrastructure. If you're still getting set up in Japan, sorting out a reliable number early means the digital side of freelancing simply works when you need it.
So think of your number as one of the quiet foundations, alongside your tax filing and your bookkeeping. Get those basics in place, keep pointing your specific questions toward official guidance or a professional, and the day-to-day of working for yourself in Japan becomes far more manageable.
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