My business falls under composition scheme of GST. Do I have to enable GST in Zoho Expense?

If your business is falling under composition scheme, then you need to pay tax as % of total turnover. Which means, you need not track SGST, CGST and IGST for expenses as you will not be eligible for input credit.

However, you need to track the expenses incurred on your purchases, which will enable your vendors to claim their input tax credit (ITC). Therefore, you need to enable taxes in your Zoho Expense organisation and track the tax applied to your purchases.