CALCMONEY // GUIDES // PAGE 3 OF 25
Blog.
Numbers-first guides on mortgages, taxes, retirement, and net worth. No opinions, no fluff.
Financial Independence Number Calculator: Your Exact FI Target
Your financial independence number is 25 times your annual expenses minus any guaranteed income. On $60,000/year spending with $24,000 in Social Security, your FI number is $900,000. Not $1.5 million. Here is how to calculate it correctly.
Emerging Markets Risk Calculator: Is the Extra Return Worth It?
Emerging markets returned 11.6% annualized from 2000-2010 while US stocks lost nearly 1%. From 2010-2020, EM returned 3.7% while the US returned 13.6%. The range of outcomes is wide. Here is how to size your allocation.
Rent vs Buy Calculator 2026: The Math in Today's Market
At 6.75% mortgage rates on a $400,000 home with 20% down, owning costs $2,609/month before maintenance. Renting the equivalent home costs $2,100/month. Owning costs more monthly but builds equity. We show the break-even scenarios.
Health Insurance Marketplace Calculator: Estimating Your Premium Costs
On $55,000 income (single), the benchmark Silver plan costs $6,840/year but you pay approximately $4,400 after the premium tax credit subsidy. Here is how to calculate your actual cost before choosing a plan.
ESPP Calculator: How to Value Your Employee Stock Purchase Plan
A 15% discount ESPP on a stock that does not move still returns 17.6% in 6 months. Sell immediately on the purchase date and you have near-guaranteed return. Here is the full ESPP math and tax treatment.
Financial Independence Age Calculator: When Can You Actually Retire?
Financial independence age depends on one number: your savings rate. At 20% savings, FI arrives at 62. At 50%, it arrives at 47. At 70%, age 36. Here is how to calculate your exact financial independence date.
Gift Tax Rules 2026: How Much Can You Give Tax-Free?
You can give $19,000 per person per year in 2026 without any tax consequence. A couple can give $38,000. Give $1 million over your lifetime and still owe nothing in gift tax. Here is how the rules actually work.
Financial Advisor Fee Calculator: How Much Are You Actually Paying?
A 1% AUM fee on a $500,000 portfolio costs over $400,000 in lost compounding over 30 years. Most people have no idea what they are paying their advisor. Here is how to calculate the real number.
How Much House Can I Afford Calculator: The Honest Version
Lenders will tell you a number based on gross income and debt ratios. That number is not how much you can comfortably afford. Here is the calculation that actually keeps you financially healthy.
High-Yield Savings Account Calculator: How Much Interest You Are Leaving on the Table
The average savings account pays 0.45% APY. High-yield accounts pay 4.5-5.0%. On $20,000, that is $810 per year vs. $90 per year. Here is how to calculate what your current account costs you and where to move it.
Freelancer Quarterly Tax Calculator: How Much to Set Aside Every Month
Freelancers pay self-employment tax (15.3%) plus income tax. On $80,000 net freelance income, the total federal tax bill is $20,204. Here is how to calculate what to set aside and when to pay.
Home Equity Loan vs HELOC Calculator: Which One Costs Less?
A home equity loan gives you a fixed rate and fixed payment. A HELOC gives you flexibility but a variable rate that can rise. On $50,000 borrowed over 10 years, the rate difference between them could cost $8,000. Here is how to choose.
House Hacking Calculator: How to Get Paid to Own Your Home
Buy a duplex for $400,000, live in one unit, rent the other for $1,800. Your out-of-pocket housing cost drops from $2,600 to $800 per month. Here is the math on house hacking and how to get started.
ETF Expense Ratio Calculator: The Silent Fee That Costs You $97,000
A 0.03% expense ratio on a $500,000 portfolio costs $150/year. A 1.0% expense ratio on the same portfolio costs $5,000/year. Over 25 years, the difference compounds to $97,000. Here is the math.
Dollar Cost Averaging Calculator: Why Boring Wins the Long Game
Investing $500 per month in an S&P 500 index fund for 25 years produces $486,000 at 7% average returns. The investor who tried to time the market produced $310,000 in most studies. Here is why.
FIRE Number Calculator: Exactly How Much You Need to Retire Early
Your FIRE number is 25 times your annual expenses. On $60,000 per year spending, that is $1.5 million. But the 4% rule has conditions most FIRE calculators ignore. Here is the complete calculation.
First Time Home Buyer Mortgage Calculator: What You Can Actually Afford
Lenders approve you for the maximum they will give. That number is not what you can comfortably afford. Here is how to calculate your real budget before you talk to a lender.
FICA Tax Calculator: What You Pay for Social Security and Medicare in 2026
FICA taxes take 7.65% from employees and 15.3% from the self-employed. Here's the 2026 wage base, Medicare surcharge thresholds, and the net investment income tax.
How Much to Save for a House: A Month-by-Month Calculator
Saving for a home on a $400K purchase requires $80K down plus closing costs plus reserves. Here's a savings timeline for every down payment target and home price.
First-Year Home Ownership Calculator: The Costs Nobody Warns You About
Buying a home costs more in year one than just the mortgage. Closing costs, moving, repairs, and furnishings can add $20,000-$40,000 before you make your second payment.
Down Payment Assistance: How Much Help Can You Actually Get?
Down payment assistance programs offer $10,000 to $100,000+ in grants and forgivable loans. Here's what's available, who qualifies, and how it changes your monthly payment.
Estimated Quarterly Tax Calculator: When to Pay and How Much
Self-employed, freelancers, and investors with capital gains need to pay quarterly estimated taxes. Here's the 2026 due dates, safe harbor rules, and a real example.
How to Calculate Boot in a 1031 Exchange and the Tax You Owe
Most investors complete a 1031 exchange believing they deferred all capital gains tax. They didn't. Boot, any cash or non-like-kind value received in the exchange, triggers immediate taxable gain. Knowing how to calculate it before closing prevents a tax bill that arrives months too late to fix.
How to Calculate Annual Recurring Revenue and Normalize It Correctly
Most founders calculate ARR by multiplying MRR by 12. That method overstates revenue, misprices valuation multiples, and misleads investors. Correct ARR normalization removes one-time fees, adjusts for churn timing, and isolates true subscription economics.
How to Calculate Days Sales Outstanding and Speed Up Collections
Most business owners track revenue but ignore the gap between earning it and collecting it. Days Sales Outstanding quantifies exactly how long your cash sits in someone else's bank account. A high DSO isn't a bookkeeping footnote. It's a direct drag on liquidity.
How to Calculate a 3-2-1 Mortgage Buydown: The Exact Math Lenders Don't Show You
A 3-2-1 buydown can save you thousands in the first three years, but most buyers accept the seller's offer without verifying the actual savings. The cost of the buydown is almost always negotiable, and misjudging it leaves real money on the table. Here is the precise calculation method.
How to Calculate an Appraisal Gap Cost (And What It Will Actually Cost You)
Most buyers discover an appraisal gap at the worst possible moment, with no plan and a closing deadline looming. The gap is not just a negotiation problem. It is a specific, calculable dollar obligation you can price before you make an offer.
How to Calculate Your ARM Worst-Case Monthly Payment Before You Sign
Most ARM borrowers know their starting rate. Almost none calculate the payment at the rate cap. That gap can cost you $800 or more per month when the adjustments hit.
7/1 ARM vs 30-Year Fixed: How to Calculate the True Cost Difference
Most borrowers compare the initial rate on a 7/1 ARM to a 30-year fixed and stop there. That single comparison ignores the reset risk that can add $80,000 or more to total interest paid. The correct method runs three separate cost scenarios across the full loan life.
How to Calculate Your 5/1 ARM Payment After Reset
Most 5/1 ARM borrowers know their rate will change. Almost none know what their new payment will be before the letter arrives. The math is fixed, the inputs are findable today, and running the numbers now gives you time to act.
How to Calculate Digital Marketing Agency Profit Margin (And Why Most Owners Get It Wrong)
Most agency owners quote a profit margin number they cannot actually defend. They're confusing gross margin with net margin, and the gap between the two is often where six figures disappear. Here is the exact math to know what your agency actually keeps.
How to Calculate Amazon FBA Net Profit After All Fees (Most Sellers Get This Wrong)
Most Amazon FBA sellers confuse revenue with profit. Referral fees, fulfillment fees, storage fees, and return costs can consume 35% to 50% of your gross sales price before you account for a single dollar of product cost. Here is the exact formula to find your true net margin.
How to Calculate Airbnb Profit Margin After All Platform Fees
Most Airbnb hosts calculate profit by subtracting the cleaning fee and calling it a day. The actual fee stack cuts 25% to 40% from gross revenue before taxes touch the number. If you have not run the full math, you do not know your real margin.
How to Calculate ARM Rate Adjustment Cap Risk Before It Costs You Thousands
Most borrowers sign adjustable-rate mortgage documents without calculating their worst-case payment. The caps written into your loan docs are not a safety net. They define exactly how much your lender can legally raise your rate, and the math is not in your favor.
How to Calculate Your Asset Allocation Glide Path Toward Retirement
Most investors set an asset allocation once and forget it. That static approach costs real money as sequence-of-returns risk compounds in the final decade before retirement. A properly calculated glide path shifts your equity exposure on a schedule, not a feeling.
How to Calculate 72(t) SEPP Payments for Early Retirement Access
Most early retirees pay a 10% IRS penalty they don't have to pay. IRS Section 72(t) lets you draw from a traditional IRA or 401(k) before age 59½ without that penalty, but the calculation method you choose changes your annual income by tens of thousands of dollars. Get the method wrong and you're either leaving money on the table or triggering a full recapture penalty.
How to Calculate Alimony Payment Amount by State
Most people guess at alimony. Courts don't. The formula varies by state, by income, and by marriage length, and getting it wrong costs thousands. Here is how to calculate what you actually owe or are owed.
How to Calculate Annuity Payout Rate and What You Sacrifice for It
Most annuity buyers accept the payout rate they're quoted without checking the math. That single number determines whether your retirement income holds up or runs short by six figures. Here's how to calculate it yourself and what you're actually giving up to get it.
529 vs Roth IRA for College Savings: How to Calculate the Best Choice
Most parents default to a 529 without running the numbers against a Roth IRA. That default can cost tens of thousands in flexibility. The right account depends on your income, your timeline, and what happens if your child skips college.
How to Calculate 457(b) Deferred Compensation Benefits for Government Workers
Most government employees treat the 457(b) as a bonus retirement account. It is not. Calculating your actual benefit requires understanding contribution limits, distribution timing, and the absence of early withdrawal penalties that make this plan structurally different from every other tax-deferred vehicle you own.
403(b) vs 401(k): How to Calculate the Real Difference in Your Retirement
Most employees assume 403(b) and 401(k) plans are functionally identical. They are not. The differences in contribution rules, employer matching structures, and investment fee schedules can shift your retirement balance by $80,000 or more over a 30-year career.
How to Calculate 1099 Income After All the Taxes You Actually Owe
Most 1099 earners underpay taxes by thousands of dollars each year because they calculate the wrong base. The self-employment tax alone adds 15.3% before federal income tax touches your income. Run the numbers correctly once, and you will never be surprised by a tax bill again.
How to Calculate the Exact Tax Savings From a 1031 Exchange
Most real estate investors underestimate their 1031 exchange savings by ignoring depreciation recapture. That single oversight can cost six figures in unnecessary tax liability. Here is the precise math.
1031 Exchange Timeline and Replacement Rules: The Exact Calculations You Need
Most investors miss the 45-day identification window not because they forget, but because they miscalculate when it starts. A single calendar error can trigger a six-figure capital gains bill. Here is how to run the numbers correctly before you close.
How to Calculate Airbnb Income Potential Before You Buy the Property
Most buyers estimate Airbnb income by looking at what nearby listings charge per night. That single number hides four cost layers that routinely turn projected profits into actual losses. The correct calculation starts with occupancy-adjusted gross revenue, then strips out every operating line before touching net yield.