Tax API with reasoning
This query is : Resolved
18 April 2026
Fellow CAs,
A genuine question from something I've been thinking about.
When a client receives a Section 201 notice — the IT department isn't asking what was deducted. They're asking **why that specific rate was applied on that specific transaction.**
Most ERPs store the outcome. None store the reasoning — why that rate, why that section, what the YTD aggregate was at that exact payment moment, what PAN status was on that date.
In practice, how are you handling this when a notice arrives?
We're building **RegInfra** — a TDS API that stores the complete decision chain at the moment of every calculation. Rate, section, threshold state, PAN status, 206AB applicability, and the exact ITA 2025 section reference — permanently, per transaction. When a notice arrives, the response is already built.
Still early. Would genuinely value perspectives from practitioners who handle this regularly.
Is this reconstruction problem real in practice — or do existing tools handle it well?
→ reginfra.com
A genuine question from something I've been thinking about.
When a client receives a Section 201 notice — the IT department isn't asking what was deducted. They're asking **why that specific rate was applied on that specific transaction.**
Most ERPs store the outcome. None store the reasoning — why that rate, why that section, what the YTD aggregate was at that exact payment moment, what PAN status was on that date.
In practice, how are you handling this when a notice arrives?
We're building **RegInfra** — a TDS API that stores the complete decision chain at the moment of every calculation. Rate, section, threshold state, PAN status, 206AB applicability, and the exact ITA 2025 section reference — permanently, per transaction. When a notice arrives, the response is already built.
Still early. Would genuinely value perspectives from practitioners who handle this regularly.
Is this reconstruction problem real in practice — or do existing tools handle it well?
→ reginfra.com
18 April 2026
Yes, this reconstruction problem is absolutely real in practice. In many TDS notices under section 201, the real issue is not just the amount deducted, but the basis of deduction—why that section was selected, whether PAN was available, whether 206AA / 206AB applied, whether threshold was crossed on that date, and what facts existed at the exact time of payment/credit. The law itself imposes consequences for failure to deduct or short deduction under section 201, and higher-rate deduction can arise under sections like 206AA/206AB, so the deductor’s contemporaneous basis matters a lot.
In practice, many teams still handle this by manual reconstruction from voucher narration, vendor master, PAN records, contract copy, historical threshold workings, return-filing status checks, and screenshots / workings retained outside the ERP. The Income-tax Department itself provides a Compliance Check functionality for section 206AB/206CCA, which shows that this status is something deductors are expected to verify and evidence. If that evidence is not preserved transaction-wise, notice handling becomes slow and subjective.
So the pain point you describe is valid: most systems store the result, not the reasoning trail. A tool that stores the decision chain per transaction—section picked, applicable rate, PAN availability, 206AB check result, threshold position, and date-specific logic—would be genuinely useful for defence, audit trail, internal review, and faster notice response. Existing tools help with computation, but unless they preserve the underlying decision snapshot, professionals often still have to rebuild the file later. This last point is an inference based on how the statutory checks work and on the department’s separate compliance-check mechanism.
Yes, the reconstruction problem is very real in practice. Section 201 notices often turn on the reason for the rate/section applied, not merely on the deducted amount. In real cases, we usually have to reconstruct from vendor master, PAN, contract nature, threshold workings, and 206AB compliance-check status as on the payment date. Most ERPs keep the outcome, but not the full reasoning trail. So a system that preserves the decision chain transaction-wise would have strong practical value for notice handling, audit defence, and consistency.
In practice, many teams still handle this by manual reconstruction from voucher narration, vendor master, PAN records, contract copy, historical threshold workings, return-filing status checks, and screenshots / workings retained outside the ERP. The Income-tax Department itself provides a Compliance Check functionality for section 206AB/206CCA, which shows that this status is something deductors are expected to verify and evidence. If that evidence is not preserved transaction-wise, notice handling becomes slow and subjective.
So the pain point you describe is valid: most systems store the result, not the reasoning trail. A tool that stores the decision chain per transaction—section picked, applicable rate, PAN availability, 206AB check result, threshold position, and date-specific logic—would be genuinely useful for defence, audit trail, internal review, and faster notice response. Existing tools help with computation, but unless they preserve the underlying decision snapshot, professionals often still have to rebuild the file later. This last point is an inference based on how the statutory checks work and on the department’s separate compliance-check mechanism.
Yes, the reconstruction problem is very real in practice. Section 201 notices often turn on the reason for the rate/section applied, not merely on the deducted amount. In real cases, we usually have to reconstruct from vendor master, PAN, contract nature, threshold workings, and 206AB compliance-check status as on the payment date. Most ERPs keep the outcome, but not the full reasoning trail. So a system that preserves the decision chain transaction-wise would have strong practical value for notice handling, audit defence, and consistency.
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