
29 May 2026
By Dr. Hamed Molatefi, tax adviser · Reviewed 24 October 2026
Receiving a tax assessment notice feels like an alarm bell for many taxpayers. The first reaction is sometimes anger and sometimes denial. Neither on its own will move the case forward. Before signing anything, making any rushed calls, or drafting any objection text, there are several calm steps you need to take.
First, read the notice in full. Note down the type of tax, the fiscal year, the declared income or tax base, the tax amount, and the date of service. The deadline for action starts from this date. Missing the deadline will narrow your subsequent options.
Second, place the authority’s figure next to your own. Ask whether the difference stems from sales, disallowed expenses, overlooked exemptions, or external indicators. Until the root of the discrepancy is clear, neither an agreement nor an effective brief is wise. A simple two-column table is enough: what you know versus what the notice states.
Third, gather documents, not emotions. Sales invoices, related bank statements, contracts, payroll lists, and Taxpayers' System (Samaneh-ye Moadian) reports are far stronger at this stage than any verbal explanation. Also list any missing documents; their absence itself forms part of the picture.
Fourth, understand your options. Sometimes a discussion to settle the matter under Article 238 is possible. In other cases, preparing a brief and appearing before the board is more appropriate. The choice depends on the strength of your documentation, the size of the difference, and your readiness for the timeline. Never choose a path simply because it “seems faster.”
Fifth, keep the language of your brief simple and well-documented. The board pays less attention to lengthy narratives than to orderly supporting evidence. Every claim should have an attachment. If you cannot prove a point, do not state it with certainty.
Sixth, consider the side effects. An agreement or ruling may affect other periods, value-added tax, or penalties. A long-term view means not closing this year’s case in a way that forces you to provide contradictory explanations next year.
Seventh, do not decide alone if the case is complex. A reliable advisor at this stage is someone who can read the notice in plain language for you and tell you which parts are genuinely defensible. There is no place here for promises of a guaranteed outcome; what can be provided is a clear picture of your options.
A tax assessment notice is not the end of the matter. It is the beginning of a documented dialogue. If you organize the deadline, the source of the dispute, and your documents in the first few days, the rest of the process will proceed more smoothly.
Frequently Asked Questions
What should we do after receiving a tax assessment notice?
First, read the notice completely and note the type of tax, performance year, income or base amount, tax amount, and notification date. Then compare the organization's figure with your own to identify the source of the difference. Next, gather related documents such as sales invoices, account statements, contracts, and taxpayer system reports.
How should we object to a tax assessment notice?
Keep the language of the objection simple and documented, and accompany each claim with an attachment. Choose possible paths such as dialogue under Article 238 or preparing an objection and attending the board based on the strength of documents and the difference in amounts. If the case is complex, do not decide alone and seek help from a reliable companion.
What points should we pay attention to when objecting to a tax assessment notice?
Consider the side effects of any agreement or ruling on other periods, value added tax, or penalties. Missing the deadline narrows subsequent options. The assessment notice is not the end but the beginning of a documented dialogue, and you must organize the deadline, source of difference, and documents in the first few days.
Official sources
Check the latest rules and deadlines on the official websites:
This article is for general information and education only and is not a substitute for professional advice. Laws and circulars can change; check the latest regulations or consult a tax adviser before making any decision.
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- Simple Guide to Registering in the Taxpayers' System for Small Businesses
- Mistakes That Make a Tax Return Fragile
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