1. Filing late
Late fees add up every day. Set a reminder for the 11th and 20th.
2. Wrong GST rate
Check the HSN code of every product.
3. Missing input credit
Match your purchases with GSTR-2B every month.
4. Cash bills without details
Always note the buyer's GSTIN for B2B sales.
5. Not keeping records
Keep invoices for at least 6 years.