Disagree with a tax assessment? Start with the right next step.

Nyphron walks you through disputing a tax assessment: check your deadline, assemble your facts-and-reasons document, organise your evidence, and file with the right office.

Built by a Canadian CPA. Independent of the CRA. A do-it-yourself document tool — not a law firm, not an accounting engagement.

Which notice did you receive?

Federal · CRA

CRA assessment or reassessment

Income tax or GST/HST — a Notice of Objection to the Canada Revenue Agency.

Start with the free deadline calculator, then the quiz to check an objection fits.

$39 CAD one-time · calculator & quiz free

Check my deadline — free
British Columbia only

BC property tax notice

Property transfer tax or speculation and vacancy tax — check the BC appeal track.

Start with the free notice check — it identifies your track and screens out cases a packet can't fix.

$79 CAD one-time · notice check, quiz & calculator free

Start with the free notice check

Not sure which one? If your letter came from the Canada Revenue Agency, it's the federal product. If it's about property transfer tax or speculation tax from the BC government, it's the BC pack. Pick the sender of your letter — the deadline rules are different.

How it works

  1. Start with the free checks. For a CRA notice, the deadline calculator estimates your objection deadline. For a BC notice, the notice check identifies what you received and which appeal track it belongs to.
  2. Take the quiz (free). Confirm the packet fits your situation — and screen out cases that need a tax lawyer or a different process instead.
  3. Build your packet. Assemble your facts-and-reasons document from guided prompts, organise your evidence, and follow the filing guide.
BC pack scope

The BC pack covers BC property transfer tax and speculation & vacancy tax assessments only — not CRA income tax. Looking for the CRA objection builder ($39)?