Verify supplier GSTINs, reconcile via GSTR-2A/2B, and use tools like TallyPrime for auto-population.
Up to ₹1 lakh via Section 80C (PPF, ELSS), 80D health insurance, and NPS tweaks—e.g., a Hyderabad engineer saved ₹45,000
Deduct at source (e.g., 10-12% on fees/salaries), deposit via challan 281 by 7th/30th, and file quarterly returns.
Use FIFO method with trackers like Koinly; retain logs for 7 years, per a Warangal investor’s success.