Guides & Articles
Practical, plain-English guides to go with our calculators — 78 articles and counting.
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Financial Calculators
CD Calculator Guide
Learn how CD laddering balances better interest rates against liquidity, and when the early withdrawal penalty makes a CD the wrong choice.
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Financial Calculators
Bond Calculator Guide
A worked before/after example showing exactly how much a bond's value drops when market rates rise — and why the coupon rate alone doesn't tell the story.
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Financial Calculators
Mutual Fund Calculator Guide
See how a 1% higher expense ratio quietly erodes decades of mutual fund growth, even when two funds start with identical returns.
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Financial Calculators
Roth IRA Calculator Guide
Understand the core tax tradeoff between a Roth and Traditional IRA, and why time horizon usually favors Roth for younger savers.
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Financial Calculators
IRA Calculator Guide
Covered by a workplace plan? Here's how Traditional IRA deduction phase-outs actually work before you count on that upfront tax break.
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Financial Calculators
RMD Calculator Guide
Tax-deferred accounts come with a catch: the IRS eventually wants its cut. Here's why RMDs exist and what happens if you skip one.
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Financial Calculators
VAT Calculator Guide
VAT is collected at every production stage while US sales tax hits once at checkout — here's why that matters for travelers and importers.
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Financial Calculators
Cash Back or Low Interest Calculator Guide
A worked example showing exactly when a cash rebate beats a low-APR loan and when it doesn't, using real payment totals across different loan terms.
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Financial Calculators
Auto Lease Calculator Guide
How residual value and money factor combine to set your lease payment, and why negotiating price alone often doesn't move the number.
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Financial Calculators
Depreciation Calculator Guide
Straight-line or declining balance? See how each affects your tax bill timing and resale-value estimates, with a worked $25,000 asset example.
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Financial Calculators
Average Return Calculator Guide
A 0% average return can hide a 25% real loss. See the math behind arithmetic vs. geometric returns and which one actually tells you what happened.
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Financial Calculators
Margin Calculator Guide
Why a 10% margin needs 10x the sales volume of a 50% margin to hit the same profit, and how fixed costs quietly erase thin margins.