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Documentation Index

Fetch the complete documentation index at: https://docs.jingjaiops.com/llms.txt

Use this file to discover all available pages before exploring further.

A pre-payment is money received before a job’s start date — typically a 50% advance against the rental balance. JingjaiOps tracks pre-payments separately so they show on the final invoice as a credit and don’t get confused with the rental subtotal.

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What a pre-payment is

A pre-payment is not a deposit. The two are different:
DepositPre-payment
PurposeRefundable collateral against damageAdvance against the rental price
VATExcludedIncluded (if VAT applies)
RefundableYes, if no damageNo — applies to the invoice
Receipt prefixDEPRPREREC
Use pre-payment when the customer has agreed to pay some or all of the rental cost before equipment goes out.

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Recording a pre-payment

1

Open the job

The pre-payment is recorded against the job (the invoice may still be in Draft).
2

Click 'Record Pre-payment'

From the Payments panel on the right side of the job detail.
3

Enter the amount

The amount the customer paid in advance.
4

Pick payment method and reference

Same options as a regular payment: Bank Transfer, Cash, PromptPay, etc.
5

Save

A pre-payment receipt is issued (PREREC-YYYY-NNNN) and the customer’s portal shows the receipt.

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PREREC receipt numbering

Pre-payment receipts use a separate sequence: PREREC-YYYY-NNNN.
  • PREREC — pre-payment receipt prefix (configurable)
  • YYYY — year
  • NNNN — sequence per year
Keeping pre-payment receipts in a separate sequence makes accounting reconciliation cleaner — your books can distinguish revenue received in advance from revenue earned.

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How pre-payments appear on the final invoice

When the job finalizes and the invoice is issued, the invoice PDF shows the pre-payment as a line below the totals:
Amount
Subtotal (rental)฿100,000
VAT 7%฿7,000
Grand Total฿107,000
Pre-payment received (PREREC-2026-0017, 12 Mar 2026)−฿50,000
Balance Due฿57,000
The pre-payment line clearly shows the receipt number and the date received, so the customer can match it to their bank record. The balance due is what they still owe.

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Multiple pre-payments

A job can have multiple pre-payments. Each one:
  • Gets its own PREREC receipt number
  • Appears as a separate line on the final invoice
  • Is summed into the total pre-payments applied
For example, if a customer pays in three installments: 
Pre-payment received (PREREC-2026-0017, 1 Feb 2026)   −฿30,000
Pre-payment received (PREREC-2026-0018, 15 Feb 2026)  −฿30,000
Pre-payment received (PREREC-2026-0023, 1 Mar 2026)   −฿40,000
─────────────────────────────────────────────────
Total pre-payments applied                            ฿100,000
Balance Due                                           ฿7,000

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VAT on pre-payments

Under Thai VAT rules, VAT is owed when payment is received OR when service is rendered, whichever comes first. If your business is VAT-registered, you may need to issue a Tax Invoice for each pre-payment as it comes in. JingjaiOps prompts you for this:
  • When you record a pre-payment, a checkbox asks “Issue Tax Invoice for this pre-payment?”
  • If ticked, a TI-PREREC-YYYY-NNNN Tax Invoice is generated alongside the receipt.
Discuss the right approach with your accountant — small businesses often issue the Tax Invoice once on the final invoice, while larger businesses issue per pre-payment.

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Refunding a pre-payment

If a job is cancelled before delivery and you’ve already taken a pre-payment, refund it:
  1. Open the job, click Cancel Job.
  2. JingjaiOps prompts you to refund pending pre-payments.
  3. Pick refund method (typically reverse the original transfer).
  4. A refund receipt is issued (negative amount) for your records.
The customer sees the refund in their portal as “Refunded”.