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Finance blog
111 posts. Each one answers a single question and links to the calculator that can take your own inputs. Dated 25 Oct 2026.
Home & Mortgage
23- How a Fixed Mortgage Payment Is Built6 min
- What a 20 Percent Down Payment Changes5 min
- When Mortgage Insurance Can Drop Off5 min
- Why Planned Extra Payments Beat a Round-Up5 min
- Biweekly Mortgage Payments Are an Extra Payment in Disguise5 min
- Refinance Break-Even Is a Payment Story and an Interest Story6 min
- FHA and Conventional Loans Price Insurance Differently6 min
- The VA Funding Fee Is Part of the Loan Balance5 min
- A HELOC and a Home Equity Loan Solve Different Problems6 min
- The 28/36 Housing Rule Is a Ceiling You Can Edit5 min
- Rent Versus Buy Depends on How Long You Stay6 min
- Cap Rate Ignores the Loan. Cash-on-Cash Does Not.6 min
- Loan-to-Value Above 80 Percent Usually Has a Price4 min
- Compare Mortgage Offers on Interest, Not Only on the Rate4 min
- A Down Payment Is a Date as Well as a Percent4 min
- Rent as a Share of Income Includes the Costs the Lease Pushes Over4 min
- Debt-to-Income Is the Snapshot a Mortgage File Starts With4 min
- A Rental Has a Cash-Flow Year and a Sale Year5 min
- Saving for a House on Irregular Income Needs a Floor5 min
- Closing Costs Start the Refinance Clock4 min
- A Calm House Payment Leaves Room After the Ratios4 min
- A Loan Estimate Has a Rate, an APR, and a Cash-to-Close5 min
- A Home Equity Loan Still Has to Fit Under the Combined Cap4 min
Auto
6- How a Longer Car Loan Lowers the Payment and Raises the Cost5 min
- Cash Back or the Low Rate: Compare Total Payments5 min
- What a Car Lease Payment Is Made Of5 min
- A Long Boat Loan Can Outlast the Fun and the Resale Value4 min
- Start from the Payment Share, Then Back into the Car Price4 min
- A Boat Payment Ignores the Slip, the Fuel, and the Insurance4 min
Investing
27- Compound Interest Is Quiet in the First Decade6 min
- Simple Interest and Compound Interest Are Not Neighbors5 min
- Present Value Is the Cost of Waiting5 min
- Why a Finance Calculator Shows a Negative Future Value6 min
- CAGR Smooths a Bumpy Path. That Is the Point and the Risk.5 min
- Use the Rule of 72 in Your Head, Then Check It4 min
- NPV Answers in Dollars. IRR Answers with a Rate.6 min
- An Expense Ratio Is a Quiet Annual Drag5 min
- Bond Prices Fall When Yields Rise5 min
- Real Return Is Not Quite Nominal Minus Inflation4 min
- A CD’s APY Already Includes the Compounding4 min
- Reinvested Dividends Buy Shares at the New Price5 min
- Payback Tells You When You Recover the Cost and Nothing Else4 min
- A Perpetuity Value Is a Ceiling for a Very Long Payment4 min
- Interest Earned Is the Part of the Balance You Did Not Deposit4 min
- Sometimes the Unknown Is the Rate5 min
- Why Two Loan Calculators Differ by a Few Cents4 min
- Payments at the Beginning of the Period Are Slightly More Valuable4 min
- The Nominal Rate and the Effective Annual Rate Answer Different Ads5 min
- APR and APY Are Not Two Words for the Same Rate4 min
- Teach Compound Growth with One Example You Can Redo4 min
- The Return You Keep Is the Return After the Expense Ratio4 min
- ROI Without the Years Is an Incomplete Sentence4 min
- The Future Value of a Monthly Contribution Is Mostly Patience4 min
- The Simple Average of Yearly Returns Is Not What You Earned5 min
- Price Each Bond Before You Call It a Ladder4 min
- The Five-Key Finance Calculator Is the Foundation Under the Others6 min
Retirement
9- A 401(k) Match Is Pay You Only Get If You Contribute6 min
- Roth and Traditional IRAs Are a Tax-Timing Choice6 min
- A Required Minimum Distribution Is a Division Problem5 min
- Claiming Social Security Earlier or Later Is a Percentage5 min
- A 4 Percent Withdrawal Is a Starting Point, Not a Contract5 min
- 2026 HSA Limits, and When the Account Is an Investment5 min
- Many Pensions Are Final Pay Times a Multiplier Times Service5 min
- A Fixed Annuity Payout Is Designed to Empty the Pot5 min
- Inflation Changes the Retirement Target Even When the Market Is Fine5 min
Tax & Income
12- Your Tax Bracket Does Not Tax Every Dollar6 min
- The 2026 Standard Deduction, by Filing Status4 min
- A Marriage Bonus and a Marriage Penalty Can Both Be Real5 min
- Withholding Is a Deposit. The Return Is the Bill.5 min
- Annual Pay Is the Wage Times the Hours You Actually Work4 min
- Time and a Half Applies to the Overtime Hours Only4 min
- Pick the Long-Term Capital Gains Bracket Instead of Guessing It5 min
- Estate Tax Is a Tax on the Amount Above an Exemption5 min
- Removing Sales Tax Is a Division, Not a Second Subtraction4 min
- A First Paycheck Needs a Budget Before It Needs an Investment5 min
- A Tax Refund Is a Deposit You Already Made4 min
- Weekly and Biweekly Pay Change the Feel of the Same Salary4 min
Credit & Debt
9- A Credit Card Minimum Is Not a Payoff Plan5 min
- Avalanche and Snowball Spend the Same Dollars Differently5 min
- A Zero Percent Transfer Still Has a Fee5 min
- Consolidation Can Lower the Payment and Raise the Interest5 min
- An Origination Fee Raises the APR Without Changing the Note Rate5 min
- Extra Student Loan Payments Shrink the Balance, Not the Program5 min
- Total Interest Is the Number the Payment Tries to Hide4 min
- Credit Card Interest Is Often Daily, and the Monthly Estimate Is Still Useful5 min
- Write Down the Day a Promotional Rate Ends4 min
Business
9- Markup and Margin Use Different Denominators5 min
- Break-Even Units Are Fixed Costs Divided by Contribution5 min
- Straight-Line Depreciation Is Even. Declining Balance Is Front-Loaded.5 min
- VAT Inside a Price Is Not the Rate Times the Total4 min
- An Equipment Lease Payment Has the Same Two Parts as a Car Lease5 min
- Match the Commission Rate to the Period You Were Paid4 min
- IRR for a Small Project Starts with a Negative First Line4 min
- GST on an Invoice Is Either Added or Already Inside4 min
- Gross Profit Can Look Healthy While Net Profit Does Not4 min
Everyday Money
16- A Budget Is a List of Jobs for Money You Have Not Spent5 min
- An Emergency Fund Covers Essential Months, Not Your Whole Lifestyle5 min
- Net Worth Can Be Mostly a House. That Does Not Make It Fake.5 min
- College Costs Often Rise Faster Than the Broad Inflation Rate5 min
- A Mid-Market Exchange Rate Is Not the Rate Your Bank Will Give You5 min
- The Car Payment Is Not the Cost of Driving4 min
- Tip the Amount You Mean, Then Split the Whole Bill3 min
- Zakat Arithmetic Starts After You Choose the Nisab5 min
- Inflation Compounds. It Does Not Add.4 min
- A Savings Goal Becomes Real When It Becomes a Deposit4 min
- A Yearly Interest Review Takes One Afternoon5 min
- A Sinking Fund Is a Savings Goal with a Known Bill4 min
- The Best Next Dollar Has an Interest Rate Attached5 min
- Two Discounts Do Not Add. They Multiply.3 min
- A Future Tuition Bill Has a Present Value4 min
- Put Giving on a Budget Line Before the Month Spends It4 min
How the blog is organized
Each post answers one question and links to the calculator that can take your inputs. The set is dated 25 Oct 2026. Posts are grouped by the same topics as the calculators: home and mortgage, auto, investing, retirement, tax and income, credit and debt, business, and everyday money.
Read the post for the relationship. Open the calculator when you want the relationship with your own figures. The two are not the same page. The post will not change its example when your balance changes. The calculator will, after you press Calculate.
What a post will not decide
A post does not approve a loan, prepare a return, or recommend a fund. Examples are teaching numbers. Limits named for 2026 should be confirmed against the IRS or the methodology before you contribute or file. The disclaimer applies to every post in the list below.
The list is grouped so you can stay inside one topic. A mortgage essay will link to a mortgage or equity calculator. A retirement essay will link to an IRA, a 401(k), a pension, or Social Security. Cross-links appear when the next question really changes, for example from a payment to the tax on the income that has to cover it. They are not added to inflate a page.
If you landed here from search, use the title as the filter. Open the post whose title is the question you have. At the end of the post, five short answers repeat the limit of the note. Then use the calculator link if you still need a figure.
FAQs
How many posts are there?
111, each dated 25 Oct 2026, grouped by finance topic.
Are the posts the same as the calculators?
No. A post explains one question. The linked calculator is where you replace the example and press Calculate.
Can I trust an example as my payment?
Only if every input matches your documents. Otherwise rerun it on the calculator.
Do you sell links in posts?
No. Related calculators are chosen because they answer the next question.
Where do corrections go?
hello@iracalculator.net, with the post address and the figure you think is wrong.