Almost every modern company keeps some cash in interest-bearing accounts, even if its core business is fully halal. That interest income is real, but it isn't permissible to keep — which is where purification comes in.
The formula
Sanad estimates the purification amount as: dividend per share × non-permissible income ratio. If a company pays $1.00 per share in dividends and 2% of its revenue comes from interest income, roughly $0.02 per share should be donated rather than kept.
Why this shows up even on "Halal" companies
This is exactly why Sanad's badge system distinguishes a clean Halal verdict from a Questionable one flagged for impure income — a company can pass every AAOIFI threshold and still carry a small, real amount of interest income that needs to be purified. The badge tells you which situation you're looking at; the purification amount (in Sanad Pro) tells you how much. See what each verdict actually means for the full picture.
An estimate, not a personal fatwa
The figure Sanad shows is calculated from the company's own reported financials. Your actual purification obligation should be calculated against your real dividend receipts for your holding period — consult a qualified scholar for your specific situation.