A common setup for small traders: QuickBooks or a basic billing app for invoices, and a separate Excel sheet (or warehouse app) for stock tracking. Every few weeks, someone manually reconciles the two. Errors are common — closing stock doesn't match the balance sheet, COGS is wrong, GST returns are inconsistent.
When accounting and inventory are in the same software, a Sales Invoice does two things simultaneously in one atomic transaction:
If either step fails, both fail. You can never have a situation where stock decreased but the accounting entry wasn't posted, or vice versa.
Cost of Goods Sold (COGS) on your P&L depends on accurate inventory valuation. If inventory is tracked separately, COGS is always an estimate. With integrated software, it's calculated automatically from the actual purchase cost of the goods sold.
AccountManager tracks stock at the godown (warehouse/location) level. If you have multiple storage locations, you always know exactly how much stock is at each location — and stock transfers between godowns don't create phantom accounting entries.