"Please provide a Japanese tax certificate" is not a precise document request. Before paying for copies, ask the receiving organization which certificate, year and issuing authority it needs. This is especially useful before an overseas move, when correcting the wrong request may involve additional postage or a representative.
Distinguish assessment from payment
Kokubunji City’s explanation of the two certificates distinguishes an assessment certificate, kazei shomeisho, showing income-related assessment information and tax, from a payment certificate, nozei shomeisho, showing payment information. A document stating how much was assessed does not by itself demonstrate how much has been paid.
Ask the requester for the Japanese document name if possible. If it needs both income information and payment status, confirm whether two certificates are required. Do not assume that a salary withholding slip will be accepted as a municipal certificate simply because it also contains tax figures.
Match the fiscal year to the income year
Yokohama’s tax-certificate guide explains that the fiscal-year 2026 assessment certificate is based on income earned from January through December 2025. The fiscal-year label and the income year therefore refer to different periods.
For example, a request for proof of 2025 income may lead you to a fiscal-year 2026 certificate, but confirm the requester’s wording before ordering. Put both labels in your message: "Income earned in 2025, shown on the fiscal-year 2026 assessment certificate." This makes the intended period easier for both sides to verify.
Identify the correct municipality
Your latest address is not necessarily the only address relevant to the certificate. Yokohama’s application FAQ explains why it asks for the January 1 address: resident tax is assessed by reference to residence on that date, and the office needs to determine whether it can issue the requested certificate.
Prepare your January 1 address for each requested fiscal year, especially if you moved between municipalities. Separately confirm whether the receiving organization wants a municipal resident-tax certificate or a national-tax-office document. Similar English translations do not make the issuers interchangeable.
Choose a delivery method you can complete
Yokohama’s assessment-certificate page describes in-person, online and postal routes, each with conditions. Do not assume that an online service will send documents to any overseas address. Ask your own municipality about identification, payment, return postage and acceptable delivery addresses before choosing a route.
If a representative will collect documents, obtain the municipality’s authorization requirements. Agree who will receive the original and how it will reach you. Also ask the receiving organization whether it needs a recent issue date, an original, a translation or another certification; those are requirements of the intended use, not something to infer from the certificate’s name.
Keep an exact request record
Save a note containing the document name, fiscal year, corresponding income year, issuing municipality, number of copies and recipient’s requirements. When the certificate arrives, compare it with that note before sending it onward.
Avoid ordering unspecified extra years merely to build a folder. A clearly identified document set is easier to maintain and replace. Add any outstanding certificate request to the departure checklist alongside its delivery method, so it remains visible after your Japanese address or employee-portal access changes.