Partner with Italthai Engineering through a streamlined supplier portal for registration, procurement information, and ongoing collaboration.
Monday – Tuesday
(every week)
(Cross-month: 1st Monday
of next month only)
09:30 – 12:00 | 13:00 – 16:00
2013 Italthai Engineering House, 5th Floor
New Petchburi Rd, Bangkapi, Huay Kwang, Bangkok 10310
Billing questions:
Tel. 02-723-4420
(ext. 5014, 5015)
Payment enquiries:
Accounting Dept:
ext. 1005–1009
Payment date confirmed after vendor submits original documents in person.
Out-of-province vendors may mail billing docs to Purchasing — arrive by 2nd of the following month.
Do not combine multiple construction sites in one billing (1 billing per 1 site).
Suppliers may submit billing upon each delivery/completion, or in batches for 1 PO.
All documents must reference the PO number and date.
Tax invoices must not be altered, corrected, or amended.
For advance payment, the PO must explicitly state the advance amount.
For goods: 1 delivery note per invoice. All items in a set must be delivered before billing.
For services/rentals: 1 work completion certificate per invoice/tax invoice.
Retention money returned only after the warranty period has expired.
| Document | Advance | Goods | Service | Retention |
|---|---|---|---|---|
| Billing Note / Invoice (orig + copy) | ✓ | ✓ | ✓ | ✓ |
| Tax Invoice (orig + copy) | ✓ | ✓ | If appl. | |
| Receipt / Tax Invoice | If appl. | If appl. | If appl. | |
| Bank Guarantee / Guarantee Cheque | ✓ | ✓ | ||
| Credit Note | If appl. | If appl. | If appl. | If appl. |
| Purchase Order (PO) — all pages | ✓ | ✓ | ✓ | ✓ |
Upload billing documents and follow their payment status online.
Italthai Engineering is seeking skilled suppliers and subcontractors.
Fill in your details below and we will get in touch.
