CALCMONEY // GUIDES // PAGE 24 OF 25
Blog.
Numbers-first guides on mortgages, taxes, retirement, and net worth. No opinions, no fluff.
State Tax Policy Update: What It Means for Your Income and Capital Gains Tax (Jul 15, 2026)
A Taxing Approach to High Energy Costs Will Backfire
State Tax Policy Update: What It Means for Your Income and Capital Gains Tax (Jun 11, 2026)
UK Proposal to Exempt Overtime from Income Tax Sounds Appealing but Is Highly Flawed
State Tax Policy Update: What It Means for Your Income and Capital Gains Tax (May 20, 2026)
We Already Have a Windfall Profits Tax. It's Called the Corporate Income Tax.
State Tax Policy Update: What It Means for Your Income and Capital Gains Tax (May 11, 2026)
Flat Tax
Rhode Island Tax Change: What It Means for Your Income and Capital Gains Tax (May 7, 2026)
Testimony: A High-Earner Surtax Would Hurt Rhode Island’s Small Businesses
Minnesota Tax Change: What It Means for Your Income and Capital Gains Tax (May 4, 2026)
Minnesota Should Not Pay for Bad Tax Policy with More Bad Tax Policy
Your Mortgage Costs More Than You Think: Calculate the True Total
Most buyers anchor to the monthly payment and miss the full picture. Origination fees, PMI, and interest compounding over 30 years can add six figures to the sticker price. The number on your loan approval is not the number you will actually pay.
How a Single Lump Sum Payment Can Save You Tens of Thousands in Mortgage Interest
Most homeowners make their monthly payment and move on. That habit costs the average borrower over $40,000 in preventable interest. One well-timed lump sum changes the math permanently.
Extra Principal Payments Cut Decades Off Your Mortgage. Here Is the Math.
Most homeowners make the minimum payment every month and assume they are being responsible. They are leaving tens of thousands of dollars on the table. A single extra principal payment, applied correctly, can eliminate years of interest before the next billing cycle closes.
Mortgage Payoff Calculator: How Much Extra Payments Actually Save You
Adding $200/month to a $350,000 mortgage at 6.75% saves $89,000 in interest and pays it off 6 years early. Here's the full breakdown by extra payment amount.
Options Profit Calculator: How to Calculate Profit and Loss on Calls and Puts
Options profit isn't just about whether the stock moves. It's about how far, how fast, and what you paid. Here's the full P&L math for calls and puts with real examples.
Paycheck Calculator: How Much Will You Actually Take Home?
Your gross salary and your take-home pay are two very different numbers. Here's exactly what gets deducted and how much you'll actually see in your bank account.
Net Worth by Age: Where You Should Be in 2026 (And How to Catch Up)
Federal Reserve data shows median net worth ranges from $76K for ages 35-44 to $290K for ages 55-64. Here's where you stand, what the benchmarks mean, and how to close the gap.
Money Market vs High-Yield Savings Account Calculator: Which Pays More in 2026
A money market fund at Fidelity yields 4.95% while the best HYSA pays 4.75%. On $50,000, that is $100 per year difference. But money market funds are not FDIC insured. Here is the full comparison.
Medicare Costs Calculator: Premiums, Deductibles, and the IRMAA Surcharge
Medicare Part B in 2026 costs $185/month at the standard rate. But at $200,000 income, the IRMAA surcharge pushes it to $515/month per person. A couple pays $330/month extra because their income was high two years ago.
Net Investment Income Tax Calculator: The 3.8% Surtax Explained
Earn $250,000 in wages and $30,000 in dividends and capital gains. The 3.8% NIIT applies to the $30,000 in investment income. An extra $1,140 tax. Here is who it hits and how to reduce it.
Money Market vs High-Yield Savings: Which Pays More Right Now?
A money market fund at Fidelity yields around 4.95% while the best HYSA pays around 4.75%. On $50,000, that is $100 per year difference. But money market funds are not FDIC insured. The full comparison is below.
Monte Carlo Retirement Simulation: Why Your Plan Needs a Stress Test
A 90% Monte Carlo success rate means 10 out of 100 simulated retirements run out of money. That sounds acceptable until you are the 1-in-10. Here is what these simulations actually measure, which variables move the needle most, and how to interpret a low success rate.
Net Worth Milestones: How Long Each $100,000 Increment Actually Takes
The first $100,000 takes the longest. The second takes half as long. By $500,000, compound interest does more work than you do. Here is the math on each net worth milestone.
Personal Loan vs Credit Card Calculator: Which Costs Less for Large Purchases?
A $10,000 purchase on a 22% credit card costs $3,428 in interest over 3 years. A personal loan at 11% costs $1,772. That $1,656 difference is real. Here is when each option wins.
Mortgage Calculator by State: Why the Same Home Costs $600 More in New Jersey
The same $350,000 home with the same mortgage rate costs $543 more per month in New Jersey than in Alabama. State property taxes make the biggest difference. Here is the breakdown by state.
Mortgage Refinance Break-Even Calculator: Is Refinancing Worth It?
Refinancing costs $3,000 to $6,000 in closing costs. If your monthly savings are $180, your break-even is 25 months. Here is how to calculate whether a refi actually saves money.
Mortgage Calculator with PMI: The Real Cost of Less Than 20% Down
Put 10% down on a $400,000 home and you owe an extra $233 per month in mortgage insurance. Here is how PMI works, how much it costs, and exactly when it disappears.
Payroll Calculator: The True Cost of an Employee vs a $75,000 Salary
A $75,000 salary actually costs an employer $95,000 to $105,000 per year. Here's the full breakdown of employer payroll taxes and benefits costs.
Self-Employment Tax Calculator: Federal and State Combined for 2026
Most self-employed workers underpay by thousands because they calculate federal SE tax without accounting for state-level obligations running parallel to it. The combined burden in high-tax states can push your effective marginal rate past 50%. Running both numbers together before quarterly deadlines is the only way to avoid a penalty-laden surprise in April.
Self-Employment Tax Deduction Calculator: Keep More of What You Earn
Most self-employed workers overpay federal income tax by miscalculating the SE tax deduction. The IRS allows you to deduct exactly half of your self-employment tax from gross income, but the math is circular and most people get it wrong. Run the numbers correctly and you recover real money.
Will Your Retirement Savings Last? Running a Longevity Stress Test
Most retirement plans are built to age 85. The average 65-year-old woman today has a 50% chance of reaching 88. Running your savings against realistic longevity scenarios reveals whether you have a funding gap before it becomes a crisis.
Do Retirement Calculators Include Social Security? What You're Actually Calculating
Most retirement calculators give you a savings target that ignores $300,000 or more in guaranteed lifetime income. You may be over-saving into taxable accounts while under-optimizing your claiming strategy. The gap between what you calculate and what you'll actually need can reshape your entire retirement timeline.
Retirement Planning With Inflation: How Price Growth Quietly Destroys Your Savings
Most retirement projections show a large number at the end. That number is almost certainly wrong. Ignoring inflation means planning to run out of money before you run out of time.
Retirement Income Calculator After Tax: What You Actually Spend vs What You Withdraw
Most retirees calculate how much they need to withdraw. Few calculate how much they keep. The gap between your gross withdrawal and your after-tax spending money costs some households more than $8,000 per year in avoidable over-withdrawal. Run the right number first.
Retirement Income Calculator With Social Security: Timing Your Claim for Maximum Lifetime Benefits
Most retirees claim Social Security at the wrong age and leave six figures on the table. The break-even math is not complicated, but almost nobody runs it before filing. Your claiming age is the single highest-impact decision in your entire retirement income plan.
Reverse Percentage Calculator: Find the Original Amount Before Tax or Discount
Most people calculate percentages forward. That habit quietly distorts every after-tax salary comparison, every sale price analysis, and every gross income estimate you make. The number on the receipt is not the number you should be working from.
Salary to Hourly Rate After Taxes: The Calculation Your W-2 Employer Won't Show You
Your employer quotes a salary. The number on your paystub tells a different story. Most salaried workers have never calculated their true after-tax hourly rate, and the gap between the two figures is larger than they expect.
Sales Tax Rate by Zip Code: Calculate Your Exact Liability Across Jurisdictions
Most buyers assume the sticker price plus one rate equals the final number. They're wrong. Sales tax in the United States fractures across 13,000+ taxing jurisdictions, and a single zip code can carry three or four overlapping rates simultaneously. Getting this wrong costs real money on every significant purchase.
Sales Tax Calculator: Working Backwards From a Total to Find the Hidden Rate
Most people accept the total on a receipt without questioning whether the tax rate applied was correct. Working backwards from a final price exposes overcharges, wrong jurisdictions, and misapplied exemptions. The math takes 30 seconds and the savings are real.
Calculate Sales Tax by Zip Code: Why Local Rates Matter for Large Purchases
Most buyers quote the state sales tax rate. The actual rate depends on the zip code, and the gap can cost you hundreds of dollars on a single transaction. Here is what precise local rate calculation looks like, and why it changes the math on major purchases.
Retirement Income Calculator: How Much Monthly Income Will Your Portfolio Generate?
A $1 million portfolio generates $3,333/month at the 4% rule. Here's the full table by portfolio size, withdrawal rate, and how Social Security changes everything.
Savings Account Calculator: How Much Interest Will You Earn in 2026?
The difference between a big-bank savings account and a high-yield account is thousands of dollars over five years. Here's the math on current top APYs.
Stock Return Calculator: How to Calculate Total Return Including Dividends
Price return and total return are very different numbers. Ignoring dividends understates S&P 500 returns by 30-40% over a decade. Here's how to calculate total return correctly.
Solo 401k Calculator: How Self-Employed People Can Save $70,000 Per Year
A solo 401k lets a self-employed person earning $150,000 contribute up to $51,432 in 2026. More than triple what an IRA allows. Here is how the contribution math works and why this is an excellent retirement account for freelancers.
Solo 401k Calculator: Maximize Contributions as a Self-Employed Person
A solo 401k lets a self-employed person earning $150,000 contribute up to $55,823 in 2026. More than seven times what an IRA allows. Here is how the contribution math works and why this account type is popular among high-income freelancers.