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For HS 620342 (men’s/boys’ cotton trousers & shorts, not knit) shipped from India to Oman:

Duty in Oman

• Oman MFN import duty: 5%
• This is the applied customs duty for this HS line per the live duty context.

Export benefit from India

• RoDTEP benefit: 4.3% of FOB value
• This is an Indian exporter rebate and can help offset embedded taxes/duties on export.

Documents you should prepare

Mandatory core export documents

• Commercial Invoice
• Packing List
• Bill of Lading / Airway Bill
• Certificate of Origin
• Customs export declaration

India-side compliance

• IEC (Import Export Code) — mandatory for exporting
• GST registration — needed for exporters claiming GST refund / zero-rated exports
• RCMC — needed if you want to claim export incentives like RoDTEP

Oman-side import clearance

• Importer will usually need:
• Commercial invoice
• Packing list
• Bill of lading
• Certificate of origin
• Import permit / license if the buyer’s product category or channel requires it
• If goods are branded or regulated by the buyer/channel, keep brand authorization and product specs ready.

Practical benefit of this lane

• Oman’s duty is relatively low at 5%, which keeps landed cost competitive.
• India’s RoDTEP 4.3% FOB can improve your net realization.
• This makes the route attractive for readymade garment exports where price sensitivity matters.

Important trade note

• Since this is textile apparel, make sure the description on invoice, packing list, and HS code match exactly.
• For best results, check country of origin marking and ensure the certificate of origin is consistent with the shipment.

If you want, I can also give you:

1. a landed-cost example for Oman, or

2. a step-by-step export checklist for India → Oman for HS 620342.