interstate sale

yes u can

which section of GST act talk about it

No under gst should folloe the proper billing format and you should use the invoice having all relevant details given by CBEC which are: 1. Name, address and GSTIN of the supplier 2. Tax invoice number (it must be generated consecutively and each tax invoice will have a unique number for that financial year) 3. Date of issue 4. If the buyer (recipient) is registered then the name, address and GSTIN of the recipient 5. If the recipient is not registered AND the value is more than Rs. 50,000 then the invoice should carry:     i. name and address of the recipient,     ii. address of delivery,     iii. state name and state code  6. HSN or accounting code of services 7. Descriptttion of the goods/services 8. Quantity of goods (number) and unit (metre, kg etc.) 9. Total value of supply of goods/services 10. Taxable value of supply after adjusting any discount  11. Applicable rate of GST (Rates of CGST, SGST, IGST, UTGST and cess clearly mentioned) 12. Amount of tax (With breakup of amounts of CGST, SGST, IGST, UTGST and cess) 13. Place of supply and name of destination state for inter-state sales 14. Delivery address if it is different from the place of supply 15. Whether GST is payable on reverse charge basis 16. Signature of the supplier

yes you can........ upto a certain limit as per it act......