Income tax return filing

Friends, mere ek client govt. employee hain aur par unki form 16 main di gayi salary aur uss par kata gaya TDS form 26 AS main jo salary aur TDS show kar raha hai usse jyada hai.Aisi condition main assesse ko kya karna chahiye aur usko kaunsi income ko maankar apni ITR file karni chahiye.Agar usne 26AS ki income ko adhar maankar ITR file kar di hai toh aise case main uske pass kya options hain.