Taxable vs Non-Taxable Income Overview

Quick answer: There's no single master list in the documents provided, but they cover several specific categories: most interest income is taxable, some municipal bond interest is tax-exempt, employer fringe benefits vary widely (some fully excludable, some partly, some fully taxable), and Social Security benefits may be partly taxable depending on your total income. This is a general overview — it doesn't cover every type of income (wages, self-employment income, capital gains, etc. aren't detailed in these excerpts).

Interest income (generally taxable)

Most interest is taxable. As Publication 550 explains, "Generally, you report all your taxable interest income on Form 1040 or 1040-SR, line 2b."¹ This includes interest that's constructively received — "you constructively receive income when it is credited to your account or made available to you. You do not need to have physical possession of it."²

Tax-exempt interest includes certain state and municipal bond interest. Publication 550 notes taxpayers should "total your tax-exempt interest (such as interest or accrued OID on certain state and municipal bonds, including zero coupon municipal bonds) reported on Form 1099-INT, box 8; Form 1099-OID, box 11; and exempt-interest dividends from a mutual fund"³ and report it separately on line 2a. However, a caution applies: "Do not report interest from an individual retirement arrangement (IRA) as tax-exempt interest."⁴

Some tax-exempt bond interest can still trigger the Alternative Minimum Tax (AMT). Interest on private activity bonds issued after 1986 is a "tax preference item" and may be subject to the AMT. See Form 6251 and its instructions for more information.⁵ But interest on certain bonds — like qualified 501(c)(3) bonds, New York Liberty bonds, Gulf Opportunity Zone bonds, Midwestern disaster area bonds, and Hurricane Ike disaster area bonds⁶ — is not a tax preference item.

Employer fringe benefits (mixed treatment)

Certain workplace benefits are excludable from taxable wages:

• Dependent care assistance: an employee can generally exclude from gross income up to $7,500 ($3,750 if married filing separately) of benefits received under a dependent care assistance program each year.⁷
• Educational assistance: you can exclude up to $5,250 of educational assistance you provide to an employee under an educational assistance program from the employee's wages each year.⁸
• De minimis benefits (small-value items like occasional gifts or parties) are excludable, but "cash and cash equivalent fringe benefits... no matter how little, are never excludable as a de minimis benefit."⁹
• Group-term life insurance over $50,000 of coverage generally becomes partly taxable, calculated using an IRS cost table.

Social Security benefits (may be partly taxable)

Whether benefits are taxable depends on your total income. The taxable part of your benefits usually can't be more than 50%. However, up to 85% of your benefits can be taxable if the total of one-half of your benefits and all your other income is more than $34,000 ($44,000 if you are married filing jointly).¹⁰

What it depends on:

• Filing status and total combined income (for Social Security)
• Whether a fringe benefit meets specific IRS program requirements (written plan, nondiscrimination rules, dollar caps)
• Bond type and issue date (for interest/AMT treatment)

Given the breadth of "taxable vs. non-taxable income" as a topic, and since these documents don't cover wages, self-employment earnings, capital gains, or many other income types, it's worth discussing your full financial picture with a CPA to get a complete answer for your situation.