Author: PK

PK started DQYDJ in 2009 to research and discuss finance and investing and help answer financial questions. He's expanded DQYDJ to build visualizations, calculators, and interactive tools. PK lives in New Hampshire with his wife, kids, and dog.
Historical IRA Contribution Limit

Annually, the IRS sets a maximum IRA contribution limits based on inflation (measured by CPI). There are limits for an […]

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Historical 401(k) Contribution Limit

Every year, the IRS sets the maximum 401(k) contribution limits based on inflation (measured by CPI). There are actually multiple […]

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Historical HSA Contribution Limit

Every year, the IRS sets the maximum HSA contribution limits based on previous limits and inflation, measured by CPI. They […]

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3D Treasury Yield Curve Chart

Below is an interactive 3D treasury yield curve chart showing U.S. Treasury yields from 1990 to the present. Watch rates […]

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Household Income Growth by Percentile: Where Income Grew Most

How much did household income grow over the years - and how did it change distributionally? Below is a tool […]

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Income Growth by Percentile: Did All Gains Go to the Top?

Did "all the income gains go to the top"? Below is a tool to test that claim: compare real individual […]

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Future Value Calculator – The Value of a Series of Investments

This future value calculator models how an investment might grow over time. It handles simple compounding, or more complex scenarios […]

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The DQYDJ Weekender 10/19/2025

Hey folks! Solidly into Fall here in New Hampshire. Pretty much (cc: our dogwoods) all of the non-evergreens have started […]

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United States Salary Statistics

Below are estimated United States salary statistics for 2025. See estimates for the average, median, and top 1% wage or salary […]

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United States Salary by Age Statistics

In this post are United States Salary Brackets by Age for 2025, including a calculator for you to zoom into any […]

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