This case N.V.Marketing Pvt. Ltd Vs. Commissioner, ST , Delhi-1 reported as 2017 (11) TMI 1406 - seems is pending before the Supreme Court.
In this case [Commissioner v. Advantage Media Consultant - 2008 (10) TMI 570 - SC ORDER] it was held that cum tax benefit will be available if ST not collected from customer.
The party was rendering Advertising Agency service and Service tax was not collected for services rendered to government agencies. It held that Service tax being an indirect tax, was borne by consumer of goods/services and the same was collected by assessee and remitted to government and total receipts for rendering services should be treated as inclusive of Service tax due to be paid by ultimate customer unless Service tax was paid separately by customer. The Tribunal had noted that cum-tax value has been incorporated in Section 67 of Finance Act, 1994 vide amendments made subsequently.
Another case Professional Couriers v. Commissioner - 2013 (1) TMI 297 - CESTAT MUMBAI- This is pending before Bom HC
The Appellate Tribunal in its impugned order had held that adjudicating authority while confirming the demand did not grant cum-duty benefit. As assessee has not collected Service Tax from recipient of services, entire consideration received has to be treated as cum-tax.
The position however was different under the Central Excise and Salt Act - section 4(4)(d)(ii) as also seen from the SC case of AMRIT AGRO INDUSTRIES LTD 2007 (3) TMI 14 - SUPREME COURT.
So looks like the value can be considered as cum-tax even if it cannot be shown that the price is inclusive of taxes.
However, to be on safer side, it is always better to mention that the price includes applicable taxes in order to avail the cum tax benefit without much dispute.