An extension of stay at the Immigration Bureau using a bank guarantee and letter of credit — how should the document set be assembled?

The issue to settle here is “An extension of stay at the Immigration Bureau using a bank guarantee and letter of credit”, so the answer below starts with what this case actually needs before setting out the general rules. Once the set is complete, check it line by line against the destination's own checklist before filing. With a fixed filing date, count backwards from it and book each certification step in reverse. If multiple certified sets are needed, order them all in the first round to avoid re-queuing. Keep a copy of every source document plus the receipt or docket from each step. High-resolution photos of seals and signatures help when the destination asks for re-verification. The point to fix before starting is the real deadline, so the steps can be scheduled backwards from it. A key variable is the filing channel (in person, agent or online), which sets the copy format to prepare. Before starting, check that names are spelled identically to the passport or ID card on every page, then confirm with the receiving body whether it wants an original, a certified copy or a certified translation, then count the number of certified sets needed before work starts, because extra sets restart the certification steps. The specifics here are purpose: Immigration; document type: Guarantee, and those decide which translation and certification level applies. The terms that frame this page are extension · stay · Immigration · Bureau. Financial-evidence requirements — minimum balance, how long funds must be held, and the exact letter format — are set by each embassy or authority and change over time, so the current published requirement should be checked before asking the bank to issue anything. Customer information held by a financial institution is protected under the Financial Institutions Business Act B.E. 2551 and the Personal Data Protection Act B.E. 2562. A bank therefore releases a statement or balance letter to the account holder or a written attorney only; a translator cannot request it on the customer's behalf. A financial translation must preserve figures, currency, dates, account numbers and balances exactly as printed — no rounding, no currency conversion, no summarising of transaction lines. The source date format should be kept with the Buddhist or Gregorian era stated explicitly so the receiving office cannot misread it. Cost and lead time depend on page count, the volume of numeric tables, the target language and the certification steps required, so every file is quoted before work starts. Send scans of the financial or tax paperwork together with the written requirements from the bank, authority or receiving embassy via LINE @NAATI, call +66 80-557-8887 or email ilc@thainotary.co.th.

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