Decision Intelligence
Withholding Is Not Tax Liability
Why taxes can be withheld correctly—and you can still owe more.
PRISM Tax Intelligence11 min read
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The PRISM Library
Understanding the reasoning behind complex tax decisions.
Too often, tax work ends with a conclusion people are expected to trust but cannot fully understand. The PRISM Library exists to close that gap.
Every article explains the reasoning behind an important tax concept, distinction, or decision so readers understand not only what happened—but why. Because better understanding leads to better decisions.
Longer-form research is published under PRISM Insights.
The PRISM Library explains the tax mechanics behind decisions that can change an outcome. Explore practical guides on self-employment, deductions, investments, equity compensation, business structure, tax planning, and other situations where the answer depends on more than a single number.
Each piece is designed to clarify what changes, what interacts, and what deserves a closer look before a decision is made.
Featured · Tax Preparation
15 Questions Your Tax Preparer Should Have Asked You
Your forms can tell us what was reported. They can’t always tell us what happened around it.
PRISM Tax IntelligencePublished August 22, 2026Updated August 22, 202616 min read
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Business Tax
When Does an S Corp Actually Save You Money?
The payroll-tax savings are real. They are also only the first line of the calculation — and what happens after can change the answer entirely.
PRISM Tax Intelligence14 min read
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Business Tax
You Started Working for Yourself. What Actually Changes on Your Taxes?
Starting freelance or self-employment income changes more than your tax rate. It changes the machinery: business profit becomes an input into several connected tax calculations.
PRISM Tax Intelligence12 min read
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Business Tax
What a Deduction Actually Does
Spending $30,000 for a write-off compresses three different numbers into one. The PRISM Pyramid separates what you spent, what you deducted, and what the deduction actually did to tax.
PRISM Tax Intelligence7 min read
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International Tax
FTC vs. FEIE: The Question Is Bigger Than It Looks
Two tax mechanisms. One taxpayer. And a decision that can change with the country, the year, the income, the state, and what happens next.
PRISM Tax Intelligence13 min read
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Equity Compensation
What Is QSBS? A Guide to the Section 1202 Qualified Small Business Stock Exclusion
Someone tells you your startup shares are QSBS. That can sound like the answer. It isn’t. Section 1202 qualification can depend on how the shares were acquired, when they were issued, what the company looked like then, and whether those facts can still be proven.
PRISM Tax Intelligence19 min read
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Equity Compensation
RSUs vs. ISOs: How They’re Taxed and What to Know Before You Act
RSUs and ISOs can both leave you holding company stock, but the tax events leading there are very different. Understand what happens at vesting, exercise, sale, and why AMT and cost basis can matter before you sell.
PRISM Tax Intelligence18 min read
Read articleStart with the basics
New to the terminology? Tax Code, Simplified. covers the foundations — ordinary income, capital gains, marginal versus effective rates, and self-employment income. Research findings are published in PRISM Insights.