206C(1H) vs 194Q — who deducts, who collects?
When a seller's turnover exceeds ₹10 crore and sells goods worth more than ₹50 lakh to a single buyer in a year, they must collect TCS at 0.1% (0.075% during COVID relief). But if the buyer's turnover also exceeds ₹10 crore, Section 194Q kicks in and the buyer must deduct TDS at 0.1% — in which case the seller's 206C(1H) obligation stops. Buyer's TDS obligation always prevails.
This creates a coordination need — sellers must ask buyers annually whether they are covered under 194Q. Most sellers now include a standard declaration in vendor onboarding to capture this once a year.