วันที่ใบแจ้งหนี้ vs Service Date vs วันครบกำหนด

The invoice date is the date an invoice is issued to a ลูกค้า. It gives both parties a reference point for their records and may be used with the agreed เงื่อนไขการชำระ to determine a วันครบกำหนด. Its importance and any required timing can depend on jurisdiction and transaction.

Invoice date vs service date

The service date describes when work was performed or a supply took place. The invoice date records when the billing document was issued. Those dates can be the same, but they do not have to be. If the distinction helps the ลูกค้า understand the charge, show a separate service period or supply date rather than changing the วันที่ออก to imply the invoice was sent earlier.

Invoice date vs วันครบกำหนด

The วันครบกำหนด is when payment is expected under the agreed terms. For example, an invoice issued on 7 ตุลาคม 2026 with Net 30 terms has a calendar-day วันครบกำหนด of 6 November 2026 if the term is counted from the วันที่ออก. The agreement or local rules may define a different starting point; write the actual date clearly when possible. Use the invoice due-date calculator for date arithmetic.

Why the วันที่ออก matters

• It lets the ลูกค้า identify the billing period and document version.
• It is commonly used with เงื่อนไขการชำระ to communicate when payment is expected.
• It helps connect a payment or reminder to the correct invoice record.
• In some tax and reporting contexts, dates can have specific effects; consult official guidance for your jurisdiction rather than relying on a generic guide.

Practical example

A consultant performs work on 30 September and issues the invoice on 7 October. The invoice can show an วันที่ออก of 7 October and a service period ending 30 September. If the agreed term is Net 14 from issue, show the resulting วันครบกำหนด or term unambiguously.

For a clear billing document, include the วันที่ออก alongside the เลขที่ใบแจ้งหนี้, service details and วันครบกำหนด.

Problems this guide helps you solve

• Choosing the right document for the current stage of the deal (proposal, bill or payment record).
• Avoiding vague descriptions, missing dates or unclear payment instructions that delay settlement.
• Keeping numbers, statuses and follow-ups aligned with what actually happened—not assumptions.

Decision checklist

1. Confirm the agreement stage: proposal, accepted work, billing or payment received.
2. Verify parties, currency, references (PO/project) and unique document numbers.
3. Make the amount due and the next ลูกค้า action obvious.
4. Save a copy and record how the document was delivered or how payment was matched.

Common mistakes

• Sending a proposal labelled as an invoice before billing is appropriate.
• Reusing document numbers or leaving critical dates blank.
• Marking something paid before funds are confirmed in your records.
• Omitting payment instructions or using a วันครบกำหนด that conflicts with written terms.

Next steps

Draft or adjust the document in the free เครื่องมือสร้างใบแจ้งหนี้, then review related guides linked on this page. Requirements can vary by jurisdiction—confirm what applies to your situation.