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Market-Based Solutions to Vital Economic Issues
Kenan Insight
Nov 10, 2021

Build Back Better by Taxing Book Income?


For the past several decades, concerns have been raised about seemingly profitable companies paying little in tax. During the 2020 presidential election, Senator Elizabeth Warren proposed taxing the financial accounting income, also called book income, of corporations – a proposal echoed and supported by then-candidate Joseph Biden. Since then, details have been fleshed out in the Build Back Better Act.

During the last couple months, lawmakers have started getting serious about passing the act. The ways to fund this act have vacillated a bit, as different democratic senators have bristled at what they believe are objectionable increases in taxes. But, in the past few weeks, a plan to include the book income of corporations in the tax base has emerged as one of the main ways to fund the Build Back Better Act. This new tax is estimated to bring in about $325 billion in new revenue.

Book versus taxable income: Why the difference?

Book income is the amount of income corporations publicly report on their financial statements so shareholders can assess the company’s financial health and profitability. This number can differ significantly from the taxable income that corporations report to the Internal Revenue Service (IRS) for a number of reasons, because the two accounting systems are, in the end, fundamentally different systems with different purposes. Many times (especially for a growing company), a corporation’s taxable income is lower than its book income. The reporting difference between the two is partially responsible for the debate around whether corporations pay their fair share of taxes.

So why is there a difference between taxable and book income? Most notably, the discrepancy reflects the distinct information needs of the various guiding bodies dictating the reporting. Congress dictates the way in which corporations report their taxable income to the IRS, while corporations compute their profits to investors according to Generally Accepted Accounting Principles (GAAP), which are rules created by the Financial Accounting Standards Board (FASB).

The goals of reporting to the IRS, as determined by Congress, and those reporting to shareholders, as determined by FASB, differ. Congress generally has three different motivations in creating tax rules: raising revenue, changing behavior and redistributing income. FASB, on the other hand, is only concerned that firms accurately report their income to investors and ensures uniformity among corporations’ accounting methods and reporting. FASB is not concerned with influencing firm behavior, nor do they earn revenue from firm financial outcomes.

So why not just tax book income?

It seems simple enough. Why not tax the income corporations report to shareholders? If one of the goals of Congress is to raise revenue through taxes, it seems that taxing book income would expand that tax base among corporations. However, this policy change would have broader implications and possibly unintended consequences.

First, the rules of reporting to the IRS are often at odds with the rules of financial accounting under GAAP, and vice versa. Taxing book income, which would essentially combine these two stakeholders, would decrease the effectiveness of both tax collection and financial reporting to investors. For example, fair value accounting is designed to give investors the most up-to-date picture of a company’s assets by revaluing certain assets according to their market value. When market value increases, this re-valuation results in an increase to financial accounting income, and is reported as an unrealized gain. Because such gains do not produce liquid assets (e.g., cash), taxing unrealized gains could result in companies being liable for paying taxes without having the cash on hand to do so.1

Second, taxing book income has been unsuccessfully attempted before, through a provision of the 1986 Tax Reform Act called the Business Untaxed Reported Profits (BURP). As noted earlier, one goal of Congress is to influence tax payer behavior, and BURP did just that — but likely not in the way it was intended. Research shows that, in response to BURP, firms adjusted their financial accounting choices to reduce their income. It is plausible that if book income were once again included in the tax base, the same results would occur and be even more pronounced. For instance, unlike in the late 1980s, firms now have a popular and credible method of reporting their success to shareholders, which would reduce the financial accounting costs of lowering book income in response to a tax on it. This alternative does not follow GAAP reporting and is often referred to as “street earnings.” Ultimately, these street earnings would be difficult to regulate or tax, and could damage the comparability and effectiveness of financial reporting and lead to negative impacts on capital markets.

Additionally, policies that force firms to use GAAP standards for tax reporting could politicize accounting standards and upend the international reputation of those standards. Although the SEC does have official oversight of FASB (who oversees GAAP), FASB has largely been able to remain politically neutral, with a few notable exceptions.2 Its independence and political neutrality are critical to its ability to effectively set accounting standards. If the product of FASB deliberation was included in the tax base and had the ability to alter cash flows for firms, it is possible that FASB’s decisions could be politically swayed. Ultimately, this perception could erode the value of the earnings signal.

So, how can we raise more tax revenue from corporations?

If taxing book income is a bad idea, how could we raise more revenue from corporations if we had to? Raising the corporate rate is a simple method Congress should be (and is) considering. Raising the corporate rate involves tradeoffs between additional revenue and destroying economic activity (as does taxing book income), but does not include the many other negative effects of taxing book income. Further, Congress should be (and is) reexamining the tax base. The corporate tax base is quite wide, but is made narrower through many exceptions to the base. These exceptions, some of which we formally label as “tax expenditures,” should be reevaluated. Rather than concocting new taxes that will have deleterious side effects in addition to the standard downside of increasing taxes, if Congress requires more corporate tax revenue, they should revise the code we have, rather than layer on new taxes.

1 Gaertner, F.B. & Hoopes, J.L. (2021, March 29). Financial Accounting Income Should Not Be Included as Part of the Tax Base: Statement for the record, U.S. Senate Committee of Finance. Write-off: The Tax Blog. https://tax.unc.edu/index.php/news-media/financial-accounting-income-should-not-be-included-as-part-of-the-tax-base-statement-for-the-record-u-s-senate-committee-of-finance

2 Zeff, S. A. (2005). The evolution of U.S. GAAP. The CPA Journal (1975), 75(1), 18

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