History remembers tax reforms through legislation. Businesses remember them through confusion.
As India crossed the June 15 advance-tax deadline, policymakers received the first meaningful signal from the ground about the functioning of the Income-tax Act, 2025. Predictably, public attention gravitated toward revenue implications, compliance statistics and collection trends. Yet those indicators may ultimately prove less important than another, largely invisible development unfolding across boardrooms, accounting departments, audit firms and tax advisory practices. For the first time since the introduction of the Income-tax Act, 1961, taxpayers are not merely adapting to amendments, notifications or procedural changes. They are adapting to an entirely new legislative architecture while simultaneously continuing to comply with the remnants of the old one. This is not simply a legal transition. It is an operational experiment involving millions of taxpayers and one of the largest behavioural transitions in the history of India’s tax administration.
The irony is striking. The Income-tax Act, 2025 was introduced to simplify taxation. Yet its first major challenge is not taxation at all. It is translation. Across the country, finance teams are discovering that replacing a tax law is considerably easier than replacing a compliance culture built over six decades. The old language of taxation remains deeply embedded in corporate memory. Assessment Year. Previous Year. Section references. Internal manuals. Audit checklists. Compliance calendars. Software workflows. Professional habits. None of these disappear because Parliament has passed a new law.
As a result, an unusual phenomenon has emerged. India’s tax ecosystem is temporarily operating in two conceptual worlds at once. Taxpayers preparing returns for Assessment Year 2026-27 continue to function under the framework of the Income-tax Act, 1961. At precisely the same time, advance-tax liabilities arising from income earned during Tax Year 2026-27 are being governed by the Income-tax Act, 2025. The Income Tax Department itself has had to create a transition mechanism under which both legislative frameworks coexist on the e-filing ecosystem.
This may appear to be a technical detail. It is not. It represents the emergence of what might be called a dual-compliance economy. In most reforms, institutions migrate from one system to another. In this transition, businesses are effectively being asked to inhabit both systems simultaneously. One law governs future obligations. Another continues to govern past obligations. One vocabulary is entering the system while another remains indispensable. The result is a temporary but significant increase in cognitive load across the compliance chain.
Economists have a term for such phenomena: transition costs. Tax practitioners may require a different term: compliance friction. Compliance friction is the hidden tax that never appears in a Finance Bill. It is measured in hours spent retraining staff. It appears in revised accounting templates, updated ERP configurations, rewritten compliance manuals and additional advisory consultations. It exists when a finance manager pauses before selecting the correct reporting period because decades of instinct conflict with newly prescribed terminology.
The transition from “Assessment Year” and “Previous Year” to “Tax Year” illustrates this perfectly. Policymakers correctly view the change as a simplification measure. Yet simplification at the legislative level often creates complexity at the implementation level. The challenge is not understanding the new terminology. The challenge is rewiring thousands of decisions that previously relied on the old terminology.
The deeper significance of this transition lies elsewhere. For decades, India’s tax debates revolved around interpretation. The future debate may revolve around architecture. The Income-tax Act, 2025 was designed not merely to simplify language but to create a more structured and digitally compatible tax code. The number of sections has been significantly reduced, redundant provisions have been removed, explanations have been integrated into core provisions and legislative drafting has been reorganised for readability.
Yet simplification of law does not necessarily mean simplification of compliance. In fact, the opposite may occur. As legislative ambiguity declines, dependence on data accuracy increases. Historically, taxpayers worried about whether a provision had been interpreted correctly. Increasingly, they worry about whether information has been reported correctly. The future compliance risk is less likely to emerge from a legal argument and more likely to emerge from a data mismatch, a transaction incorrectly mapped, a reporting field incorrectly populated, a reconciliation inconsistency, an information statement discrepancy or an automated risk trigger generated by incompatible datasets.
The centre of gravity is quietly shifting from tax law to tax systems. This is why the most important story of June 2026 may not be the first advance-tax instalment itself. It may be the emergence of a new philosophy of tax administration. The old system often depended upon human interpretation. The new system increasingly depends upon machine readability.
This distinction is profound because it alters the nature of compliance. Businesses are no longer merely complying with legislation. They are complying with an information architecture. The consequences are particularly significant for India’s MSME sector. Large corporations possess dedicated tax functions, enterprise technology systems and specialist advisors. Smaller businesses possess none of these luxuries. For them, every terminology change, every reporting update and every procedural migration carries a disproportionately higher compliance cost. The success of the new tax regime will therefore not be determined by how efficiently India’s largest corporations adapt. It will be determined by how seamlessly India’s smallest enterprises transition.
Perhaps the most overlooked aspect of the reform is that despite the repeal of the 1961 Act, much of its administrative legacy remains alive. Assessments, appeals, reassessments, rectifications, circulars, approvals, registrations and faceless proceedings continue to survive through carefully designed transition provisions. The old law may have been repealed, but it has not entirely disappeared. It continues to cast a long administrative shadow over the new regime.
This reveals a broader truth about governance. Institutional continuity often matters more than legislative novelty. Governments can enact new statutes overnight. They cannot replace administrative memory overnight. And that is precisely why June 2026 matters.
This month was not merely the first advance-tax cycle under the Income-tax Act, 2025. It was the first real-world examination of whether legislative simplification can survive operational reality. The verdict remains unfinished, but the early evidence is instructive. The law is simpler. The transition is not. The drafting is clearer. The implementation is still learning. The framework is modern. The behaviour it seeks to reshape is decades old.
Ultimately, the success of the Income-tax Act, 2025 will not be determined by the elegance of its drafting or the reduction in its page count. It will be determined by something far more fundamental: whether millions of taxpayers can move from compliance by habit to compliance by design. Because the defining challenge of India’s newest tax law is not collecting tax. It is changing behaviour.
And history suggests that behavioural reform is always harder than legislative reform.
Disclaimer
Views expressed above are the author’s own.
