Remote Work for Japanese IT Companies While Living in Korea: A Complete Guide to Visas, Contracts, Taxes, and Day-to-Day Practice

Remote Work for Japanese IT Companies While Living in Korea

Japan's IT talent shortage is now opening up opportunities for Korean developers as well. Since remote work has become fully established in the Japanese IT industry post-pandemic, collaborating with Japanese companies while living in Korea has become a genuinely realistic option.

However, there is a lot to understand along this path — legally, tax-wise, and practically. Unexpected problems can arise from incorrect contracts or tax filings. This guide compiles everything a Korea-based engineer needs to know when collaborating remotely with Japanese IT companies.

Important disclaimer: This post is intended for general informational purposes and does not substitute for legal or tax advice. Before entering into specific contracts or filing taxes, please consult relevant professionals (a tax accountant, a labor specialist, etc.).

1. The Reality of Japan IT Remote Work from Korea

What Is Possible Without a Visa

When you live in Korea and work with a Japanese company, you do not need a Japanese work visa as long as you remain in Korea. This is because you are not entering Japan to work.

However, the legal character of the arrangement differs depending on the type of work:

業務委託 (ぎょうむいたく) — Service Contract This is a form of contracting with a Japanese company as a freelancer or independent contractor. It is similar to a Korean "service provision contract" (용역 계약). Under this arrangement, you can perform work for a Japanese company from Korea and receive compensation for it.

正社員 (せいしゃいん) — Full-Time Employment with Remote Work This is the case of being hired as a full-time employee of a Japanese company. More complex legal questions arise in this case. How much Japanese labor law applies, and how Korean national insurance (건강보험/국민연금) should be handled, are questions that must be confirmed with a specialist. In practice, because a full-time remote employment arrangement with a Korea-based person creates significant administrative burden for the Japanese company side as well, the tendency is to prefer the 業務委託 format.

Important note: Even if an arrangement is labeled 業務委託, if the actual relationship is essentially the same as that of an employee, Korean or Japanese labor-related laws may still apply. It is recommended to have a specialist review the arrangement before signing.

Practical Differences Between 業務委託 and Full-Time Remote

Types of Work That Are Realistically Possible

Here are realistic forms of remote work with Japanese IT companies for Korea-based individuals:

Freelance development work Output-based work such as web development, mobile app development, and API development. Can be found through crowdsourcing platforms.

Technical consulting Advisory or consulting work based on specialized expertise in a particular technical area. Advantageous for senior engineers.

Long-term 業務委託 partnerships Entering a long-term service contract relationship with a specific Japanese company. Effectively full-time work in practice, but the contract form is freelance. This is the most common form of Korea-based remote collaboration.

Open source contribution + sponsorship Contributing to open source projects used by a Japanese company and receiving sponsorship from that company. Relatively rare but genuinely happens.

2. Understanding the Legal Structure

Contracting with Japanese Companies as an 個人事業主 (Sole Proprietor)

The most common legal structure for a Korea-based person entering a service contract with a Japanese company is as follows:

1. Business registration in Korea: Register as a sole proprietor with a Korean tax office
2. Conclude a service contract with the Japanese company: The contract is written in Japanese, or in both Korean and Japanese
3. Perform the work: Work remotely from Korea
4. Receive payment: Received in yen or Korean won
5. File taxes in Korea: File comprehensive income tax under Korean tax law

Key Items to Confirm in the Contract

When contracting with a Japanese company, you must carefully review the contract. In particular, check the following items:

業務内容 (ぎょうむないよう) — Scope of Work What work you will perform must be clearly stated. Vague language becomes a source of disputes later.

報酬 (ほうしゅう) — Compensation Confirm the amount, currency, payment method, and payment cycle. It should be stated explicitly, for example as 「月額〇万円」 (monthly fee of X yen) or 「時間単価〇円」 (hourly rate of X yen).

支払い条件 (しはらいじょうけん) — Payment Terms Confirm the billing cycle, payment date, and whether late payment penalties apply. In Japan, end-of-month invoicing paid at the end of the following month (月末締め翌月末払い) is common.

知的財産権 (ちてきざいさんけん) — Intellectual Property Rights Confirm who owns the code, documents, and other materials you produce. In most cases they are assigned to the client, but the scope should be made explicit.

秘密保持 (ひみつほじ) — Confidentiality (NDA) Confirm the scope of confidential information and the duration of the obligation.

契約解除 (けいやくかいじょ) — Contract Termination Confirm the notice period (通知期間). Written notice 30–60 days in advance is generally standard.

準拠法 (じゅんきょほう) — Governing Law Confirm whether Korean or Japanese law governs the contract. This matters significantly if a dispute arises.

Tax Filing (In Korea)

A Korean resident who receives income from a Japanese company has a tax filing obligation in Korea.

Business registration If your annual income exceeds a certain threshold, business registration is recommended. You can register as a VAT-exempt business or a general business.

Comprehensive income tax Every May, file a comprehensive income tax return for the previous year's income. Because income is classified as business income, you can deduct necessary expenses (laptop, internet bills, education costs, etc.).

Value-added tax (VAT) Services provided overseas (IT services provided to Japanese companies) may be eligible for the zero rate (0%). This point requires confirmation with a tax accountant.

Tax Treaty Between Korea and Japan

Korea and Japan have a tax treaty (租税条約, そぜいじょうやく) in place to prevent double taxation. Under this treaty, you are not required to pay taxes on the same income in both countries.

In general, business income received by a Korean resident from a Japanese company is taxed only in Korea. However, the Japanese company may still withhold tax at the source (源泉徴収, げんせんちょうしゅう). In that case, you can file for a foreign tax credit in Korea to prevent double taxation.

Consult a tax accountant for this part without fail.

Items That Require Professional Consultation

The following matters are difficult to determine on your own and require professional advice:

• Determining whether an arrangement qualifies as 業務委託 or employment (applicability of labor law)
• Whether to register a business and what type to choose
• Whether Japanese withholding tax will apply
• How to file for the foreign tax credit
• How to handle health insurance and national pension
• Reporting obligations when receiving foreign currency (Korea Bank reporting required if over USD 50,000 annually)

3. Managing Exchange Rate Risk

The Reality of a Weak Yen Era

Since 2022, the Japanese yen has continued to weaken, repeatedly setting historical lows. In 2020, 100 yen exchanged for approximately 1,100 Korean won, but in 2024–2025 it traded at approximately 850–900 won per 100 yen.

This means that if you receive your salary in yen, your real income has declined substantially. For example, if you have a contract for 500,000 yen per month:

• 2020 exchange rate: approximately 5,500,000 won
• 2024 exchange rate: approximately 4,300,000–4,500,000 won

That is approximately a 20% reduction in real income.

Given this exchange rate risk, strategies to consider include negotiating your contract in won terms from the outset, or requesting an exchange rate risk premium.

Methods for Receiving Yen

Wise (formerly TransferWise) Among international remittance services, Wise tends to have the lowest fees. It is well suited for receiving Japanese yen and converting to Korean won.

Pros: Low fees, real-time exchange rates applied, fast processing Cons: Check limits for large transfers

Japanese domestic bank account (non-resident account) Some Japanese banks allow non-residents to open accounts. Sony Bank and Rakuten Bank (楽天銀行), for example, sometimes allow online account opening.

Pros: Can hold yen and convert at a favorable time Cons: Account opening requirements may be strict; maintenance fees may apply

Foreign currency account at a Korean bank Open a yen-denominated foreign currency account at a Korean bank, receive yen, then convert when you choose.

Pros: Safety of a Korean bank Cons: Foreign exchange fees may be higher than Wise

Exchange Rate Risk Management Strategies

Dollar-cost averaging approach to currency conversion Convert 50% of the yen you receive each month immediately, and hold the remaining 50% to convert when the rate is favorable. This has the effect of spreading the risk of exchange rate fluctuations.

Negotiate in Korean won Negotiate the contract from the start in won terms. You can negotiate with language like 「月額300万ウォンで契約したい」 (I would like a monthly contract of 3,000,000 won). The Japanese company bears the exchange rate risk in this arrangement, so negotiation may be difficult, but it is possible if you have strong negotiating leverage.

Set up yen rate alerts Use your bank app or exchange rate notification service to set up alerts when the exchange rate reaches your target. Convert currency in concentrated amounts when the rate exceeds a certain level.

Calculating Your Real Annual Salary in the Weak Yen Era

When evaluating a Japanese IT contract, always calculate your real annual salary using the current exchange rate:

Example calculation (assuming 2025 exchange rates):

• Contract amount: 600,000 yen per month
• Applying 100 yen = 900 won
• Monthly equivalent: 600,000 yen × 9 won/yen = 5,400,000 won
• Annual equivalent: approximately 64,800,000 won

However, expenses and taxes must be subtracted from this:

• Comprehensive income tax: varies by income level (assuming approximately 20–30%)
• National insurance (after leaving employer-based coverage, switching to regional coverage): approximately 10–15% of income
• Business expenses (internet, equipment, education, etc.): approximately 5–10%

Your actual after-tax take-home may be around 60–70% of the contract amount.

4. Job Platforms and How to Find Work

Japanese Crowdsourcing Platforms

クラウドワークス (Crowdworks) Japan's largest crowdsourcing platform. It has many IT-related projects including web development, app development, and systems development.

Characteristics:

• Japan's largest freelance platform
• Range from short-term projects to long-term contracts
• Japanese is required (N3 or above recommended)
• Fees: 5–20% of compensation

Registration method: You will need to write your profile in Japanese. Using AI to write a natural Japanese profile is recommended.

Lancers (ランサーズ) Along with Crowdworks, one of Japan's two major crowdsourcing platforms. Well-organized categories for systems development, web creation, IT consulting, and more.

Midworks An IT engineer-specialized agency service. Contracts are typically monthly and tend to be higher-paying projects. N2 or above in Japanese recommended.

PE-BANK An engineer-specialized freelance agency. Rates are higher, but client standards are also higher.

Global Platforms Targeting Japanese Companies

LinkedIn You can contact hiring managers or CTOs at Japanese companies directly. An English-language profile works, but a connection strategy targeted at Japanese IT companies is effective.

Direct contact message example:

「はじめまして、[name]と申します。
韓国のバックエンドエンジニアで、Pythonと
クラウドインフラに5年以上の経験があります。

[company name]の技術スタックと事業内容に大変興味を持ち、
リモートでの業務委託でお役に立てないかと思い
ご連絡いたしました。

もしご興味がございましたら、30分ほど
お話しさせていただけないでしょうか？」

Toptal A global top-tier freelance platform. The screening process is rigorous, but once you are registered, you have access to high-rate projects including from Japanese companies.

GitHub Jobs / Remote OK Platforms specializing in remote work positions. Many English-language positions posted by Japanese companies appear here too.

Using the Japanese IT Community

Qiita (キータ) Japan's largest technical blogging platform. Writing technical posts in Japanese here gives you exposure to Japanese developers and can naturally lead to collaboration opportunities.

connpass Japan's IT events platform. Attending online technical seminars or meetups is a way to build your network.

Twitter/X Japanese IT community Japanese developers are extremely active on Twitter/X. Posting technical tweets in Japanese or engaging with Japanese developers is a natural way to build a network.

5. Things to Watch Out For in Actual Work

Managing Time Zone Differences

Korea (KST, UTC+9) and Japan (JST, UTC+9) use the same time zone. This is a very favorable condition for remote collaboration. Meetings that require real-time communication can be scheduled without any time zone adjustment.

However, be aware of the implicit expectation gap that can arise from your Japanese team knowing you are working from Korea. Some Japanese companies may expect a Korea-based remote partner to be responsive during Japanese business hours (9:00–18:00 JST).

It is good practice to clarify your availability (対応時間) clearly in the contract:

「業務時間は平日10:00〜19:00 KST（日本時間と同じ）とし、
この時間帯はSlackのメッセージに1時間以内に返信します。
緊急の場合は電話でのご連絡もお受けします。」

Meeting Etiquette

There is etiquette to observe in Japanese business meetings, especially in online remote settings:

Before the meeting

• Connect 5 minutes early to check for technical issues
• Turn your camera on if possible (カメラをオンにする): this helps build trust
• Keep your background tidy (or use a virtual background)

During the meeting

• State your name before speaking: 「[name]ですが、〜」
• Do not interrupt: In Japanese meetings, silence indicates attentive listening
• Take notes actively

After the meeting

• Share a summary of discussion points and decisions via Slack or email
• Confirm your own action items and report when complete

「本日のMTGのサマリーと次回アクションアイテムを
共有させていただきます。

■ 議事内容
・[discussion item 1]
・[discussion item 2]

■ アクションアイテム
・[name]: [task] - 期限 [date]
・[other person's name]: [task] - 期限 [date]

よろしくお願いいたします。」

Tools (Slack, Notion, GitHub in a Japanese Environment)

The collaboration tools used by Japanese IT companies are largely the same as those used by Korean companies, but there are differences in how they are used.

Slack in a Japanese environment

Channel naming conventions in Japanese teams:

• #全体連絡 or #announcements instead of #general
• #雑談 (casual chat) instead of #random
• #incident-[service-name] or #障害対応

Slack etiquette:

• Use mentions only when truly necessary
• When it is not urgent, start with 「お時間あるときに〜」 (When you have a moment...)
• Many teams make active use of emoji reactions (👍 ✅ 🙏)

GitHub PRs and Issues in Japanese

Notable aspects of GitHub usage in Japanese teams:

• Many teams write PR titles and descriptions in Japanese
• Issue templates may be written in Japanese
• Use of polite forms (keigo) in code review comments

Notion documents in Japanese

Things to watch out for with Notion in Japanese teams:

• Page structures tend to be more hierarchical than in Korean companies
• Meeting minutes (議事録, ぎじろく) tend to be written in great detail
• Many teams manage a glossary (用語集, ようごしゅう) page carefully

6. Success Story: A Reconstructed Interview

The following is a reconstructed fictional interview based on real cases. Details have been changed to protect privacy.

Park Ji-hoon (pseudonym), 35, based in Seoul, senior backend engineer Two years into remote collaboration with a Japanese FinTech startup

How did you first connect with a Japanese IT company?

Honestly, it wasn't intentional at first. I posted a Python library I had built as a personal project on GitHub, and one day I got a DM from the CTO of a Japanese startup. They said they were using my library in their product and had some improvement suggestions, and a conversation started naturally from there.

After a couple of months of open-source conversation, they were the first to say 「ぜひ一緒に働きたい」 (I'd really like to work together). I was worried at first because my Japanese wasn't strong enough, but their CTO could also do English, so we started in English and gradually increased the proportion of Japanese.

How did you overcome the language barrier in practice?

The first six months were the hardest. There were times when writing a single Slack message took 10–20 minutes, and in meetings there were often times when I couldn't follow the fast Japanese.

There are a few methods I used. First, be honest when you don't know. I didn't hesitate to ask 「すみません、もう一度ゆっくり話していただけますか？」 (I'm sorry, could you say that once more slowly?). I was embarrassed at first, but the Japanese team was actually more accommodating for it.

Second, actively using AI. Before sending a Slack message, I always asked Claude or ChatGPT to "fix this message into natural Japanese." After six months, I was able to write basic messages without AI help.

Third, auto-recording and summarizing meetings. Using automatic captioning in Zoom or Google Meet combined with AI summarization, I was able to review content I had missed during meetings afterward.

How have you dealt with the exchange rate issue?

The yen weakness really stings. Every time I renew my contract, I negotiate for a rate increase that reflects the inflation rate and exchange rate fluctuation. I hesitated at first, but after two years of work with clear results, the team has been understanding.

I also keep some of the yen I receive in a Japanese yen account and convert it when the rate rises. It is not perfect, but it spreads the risk somewhat.

What advice would you give to someone just starting out with remote work in Japan from Korea?

Three things I really want to say.

First, technical skills are the most important. Even if your Japanese is weak, you can build trust through code first. Maintaining a good GitHub profile and contributing to open source are the most powerful portfolio pieces you can show to Japanese companies.

Second, don't give up on Japanese. Starting with English is fine, but ultimately integrating deeply into the team requires Japanese. N2 level is enough to get started.

Third, for taxes and contracts, use a professional. I handled things on my own in the early days and later found out from a tax accountant that I had missed several deductible items. Consulting with a tax accountant even once a year ends up paying off.

Closing: The Future of Korea–Japan IT Remote Collaboration

Japan's IT talent shortage will not resolve quickly. It is a structural problem driven by low birth rates and an aging population, while IT transformation demand continues to grow. This means the environment will remain favorable for Korean engineers in the long term.

The unfavorable condition of a weak yen exists, but flipping the perspective: the lower cost of Japanese IT services in dollar terms may lead Japanese startups to make even greater use of overseas talent.

A Korean engineer who combines strong technical skills, Japanese language ability, and an understanding of Japanese business culture is the strongest candidate for Japan–Korea IT collaboration. Make full use of the structural advantages you have: familiarity with kanji, and similar work culture.

You don't need to have everything in place right now. Cleaning up your GitHub profile and making one small contribution to an open source project used by a Japanese company — that is the starting point.