Can I make sales on a "tax-included" basis?

Yes. Effective January 3, 2008, a vendor may assume and absorb all or any part of the sales and use tax on a retail sale and pay that tax on behalf of the buyer. The vendor must, however, continue to separately state the tax from the sales price at the time of sale to the purchaser. If the vendor absorbs all or any part of the tax on the sale, the vendor shall pay the tax with the return that covers the period in which the vendor makes the sale.