When Taxes Become the Hidden Architects of Financial Innovation

When a new financial product is launched, we instinctively credit the ingenuity of investment bankers, fund managers, and quantitative analysts. We imagine innovation emerging from trading floors and research laboratories.

Perhaps we are giving credit to the wrong people all the time.

The greatest financial engineer may well be the tax code, albeit unknowingly.

This is not because tax authorities invent Exchange-Traded Funds, arbitrage funds or REITs. They do not. But taxation often determines which products flourish, which disappear, how companies finance themselves, and where households invest their lifetime savings.

Markets do not merely comply with tax laws; they design themselves around them.

Consider the spectacular rise of the ETF in the US. Its popularity is usually attributed to low costs, liquidity and passive investing. All true. But one of its greatest competitive advantages has been fiscal.

Traditional US mutual funds generally distribute realised capital gains to their investors whenever portfolio securities are sold, triggering taxes even if the investor continues to hold the fund. Most ETFs, by contrast, can often avoid realising those gains by using an in-kind creation and redemption mechanism, allowing appreciated securities to leave the portfolio without a taxable sale. As a result, broad-market ETFs have historically distributed far fewer taxable capital gains than comparable mutual funds.

The tax code did not invent the ETF. But it unquestionably helped make it one of the most successful investment vehicles in history.

India offers equally revealing examples.

Arbitrage funds are perhaps the clearest illustration. Economically, they often resemble short-term fixed-income investments, earning returns from price differences between the cash and futures markets rather than from equity risk. Yet because of how they are structured, they qualify as equity-oriented mutual funds for tax purposes. Investors were not merely choosing an investment; they were choosing a tax classification.

Equity Savings Funds similarly combine debt, arbitrage and equity while retaining equity tax treatment. Sovereign Gold Bonds encouraged investors to substitute financial gold for physical gold not by changing the underlying asset, but by changing its tax treatment. In each case, the innovation lay as much in the legal wrapper as in the underlying investment.

The underlying assets scarcely changed.

The tax wrapper did.

Corporate Choices
The influence of taxation extends even deeper than investment products.

One of the foundational results in corporate finance is that, in a frictionless world, a company's value should not depend on whether it is financed by debt or equity. Yet tax systems around the world immediately disturb that neutrality. Interest paid on debt is generally deductible in computing corporate taxable income; dividends paid to equity shareholders are not. The result is a lower after-tax cost of debt — the familiar "debt tax shield" — which encourages companies to borrow more than they otherwise might. Entire debates on optimal capital structure owe as much to the income tax codes as they do to finance textbooks.

Curiously, household investing has often been nudged in the opposite direction. For years, equity-oriented mutual funds enjoyed more favourable capital gains treatment than debt funds. Products such as arbitrage funds became popular precisely because they could economically resemble fixed-income investments while qualifying for equity taxation.

To companies, the tax code said, "Borrow." To households, it often said, "Own equity."

This should force policymakers to rethink the purpose of taxation. One can look at the debates on capital gains taxes on capital market products. One argument that goes against removing capital gains taxes on capital market investments is how the government would make up for the loss of revenue, estimated at over ₹1.29 trillion, if it exempts capital gains on long-term investments. The arithmetic is correct.

The economics is incomplete.

It is true that governments usually evaluate tax proposals by estimating the revenue they will raise. That is necessary, but it is not sufficient. Taxes also shape behaviour. They influence which financial products deserve research budgets, which business models attract capital, how firms finance themselves, and how households save for retirement.

In other words, every tax code is also innovation policy within the broader public framework.

This is where the debate extends beyond financial products to the architecture of capital markets themselves.

A stock market is not merely another tax base. Its primary purpose is to transform household savings into productive capital for businesses.

If taxation discourages long-term ownership while leaving economically similar products with more favourable tax treatment, policymakers should ask whether the tax system is inadvertently rewarding financial engineering over capital formation. John Kay argued in Other People's Money that modern finance had become increasingly preoccupied with trading claims on capital rather than creating capital itself. Tax policy should reinforce that distinction, not blur it.

The issue is particularly important in India.

Unlike many developed economies, India does not provide an expansive welfare state capable of financing retirement for most citizens. Pension coverage remains limited, millions work outside the formal sector, and interest on bank deposits is fully taxable. For millions of households, long-term ownership of productive assets is not speculation; it is retirement planning. Taxes therefore influence not merely portfolios but financial security itself.

None of this is an argument that capital gains tax should necessarily be abolished, nor that every tax preference creates genuine economic value. Many financial innovations are little more than sophisticated tax arbitrage.

But the opposite danger is equally real.

When taxes become the dominant determinant of product design, financial engineers devote their intelligence to navigating legislation rather than allocating capital more efficiently. Innovation migrates from serving the real economy to serving the tax code.

Perhaps that is the real lesson.

Every exemption, every holding-period rule, every differential tax rate and every legal definition of "equity" or "debt" becomes an invitation to financial engineering. Legislatures believe they are writing revenue laws. But markets read them as product manuals.

The next time a dazzling financial innovation is celebrated, policymakers should ask a simple question before applauding its ingenuity:

Has it discovered a better way to finance economic growth or merely a better way to navigate the Income Tax Code?