What this site is, and what it is not.
The pages on this site describe software and the services the firm offers. Nothing on them is tax advice or legal advice, and nothing on them should be acted on as though it were. Whether a rule applies to you, and from when, depends on your registration and your circumstances.
Advice is something a person gives you about your situation, after seeing it. Ask, and you will get one.
Nisaab is not part of the Federal Board of Revenue and does not act for it. It integrates with FBR's Digital Invoicing system as a taxpayer's software does, using credentials you obtain yourself from IRIS.
Where this site quotes an FBR rule, a notification or an error message, FBR's own published text governs — not our summary of it.
Representation before FBR, the Appellate Tribunal and the courts is carried out by a qualified advocate, directly and under the professional rules that govern advocates. It is not sold as part of a software package, and no outcome is promised — nobody can promise one.
The software checks an invoice against FBR's published lists before sending it and reports what FBR answers. It cannot know whether the figures you entered describe the sale you actually made. The return you file remains yours.