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Step-by-step guides for money, invoices, QR codes, budgeting and everyday business workflows, paired with free CalculatorAI tools so you can act immediately.
Short guides with the calculator, tracker or document tool already attached.
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Featured guide
Zero-Based Budgeting: How to Give Every Dollar a Job (With a Real $5,400 Month)
Budgeting11 min read
A complete zero-based budget on $5,400 take-home pay: $4,500 of yearly costs turned into monthly lines, what 50/30/20 misses, and how overspending carries.
CalculatorAI Team · Oct 25, 2026
Read the guideTool Handbooks & Guides
Budgeting11 min
Medicare Open Enrollment 2027: What Switching Your Drug Plan Saves
2027 Part D: $700 deductible, $2,400 cap, 3.6% COLA. What staying or switching a drug plan costs at three levels of drug spending, and what Part B takes.
Oct 25, 2026Read
Taxes10 min
2027 Tax Brackets: What a 3.2% Inflation Adjustment Does to Your Paycheck
Projected 2027 federal tax brackets and standard deduction ($16,600 / $33,200) from the IRS formula, and what they change on $45k, $75k and $150k paychecks.
Oct 25, 2026Read
Rentals11 min
The Short-Term Rental Tax Loophole: How a $500,000 Airbnb Deducts $101,364 in Year One
The 7-day average stay, the hours test and 100% bonus depreciation, worked on a $500,000 Airbnb: the first-year deduction and what you repay at sale.
Oct 23, 2026Read
Budgeting8 min
How Much Does Halloween Cost in 2026? Candy Is Up 7.7% — Here's the Budget for a Family of Four
NRF expects $115.14 a person this Halloween while candy prices rose 7.7%. Candy for 50–150 trick-or-treaters, costumes and decor for a family of four.
Oct 23, 2026Read
Budgeting10 min
Inflation Is 3.7%: What It Does to Your Cash, Your Raise and Your Budget
September CPI hit 3.7%, driven by a 34% jump in gas. What it costs $25,000 in savings, a 3% raise and a $6,000 monthly budget — and what still keeps pace.
Oct 23, 2026Read
Investing9 min
Visa and Mesh Crypto Payments: What 175 Million Merchants Really Means
Visa and Mesh say crypto balances can fund purchases at 175 million merchants. Here is how conversion works, what remains unknown, and the tax cost.
Oct 19, 2026Read
Invoicing10 min
Shopify Reorder Point Formula: When to Restock Before You Sell Out
Calculate a Shopify reorder point from sales velocity, supplier lead time and safety stock. A worked example shows when a simple threshold becomes too risky.
Oct 19, 2026Read
Taxes9 min
The 7-Minute Rule for Time Clocks: What Rounded Shifts Really Cost
Losing six minutes on five shifts a week can erase $572 a year at $22 an hour—or $858 when the time is overtime. See when federal rounding is neutral.
Oct 19, 2026Read
Taxes10 min
DoorDash Mileage Deduction 2026: Which Miles Count and What They Save
A DoorDash driver logging 11,520 business miles can deduct $8,554 in 2026. See which trips count, what DoorDash estimates miss, and the records IRS expects.
Oct 19, 2026Read
Invoicing10 min
Appointment No-Shows: What They Really Cost and Whether Deposits Fix Them
At 10% no-shows, a stylist with 30 bookings a week at $75 loses $10,800 a year. What reminders win back, and the no-show rate where a deposit pays.
Oct 14, 2026Read
Taxes12 min
Shift Differential Pay: What Nights and Weekends Are Worth
A $5 night differential is worth $9,360 a year on three 12-hour nights. What differentials pay per shift, month and year, and how they raise your overtime.
Oct 14, 2026Read
Investing10 min
Median Net Worth by Age 2025: What the Fed's New Survey Says
The Fed's 2025 survey puts median family net worth at $215,900. See the median by age, what changed since 2022 and how to compare your own number fairly.
Oct 14, 2026Read
Budgeting9 min
Winter Heating Costs 2026: What Your Bill Will Be and How to Budget for It
EIA expects heating oil bills up 21% this winter and gas down 9%. What your fuel will cost each month, and what to set aside now to cover it.
Oct 12, 2026Read
Housing11 min
Extra Mortgage Payments at 7.4%: Pay Down the Loan or Invest?
Mortgage rates hit 7.40%. What $100, $200 or $500 a month extra saves on a $400,000 loan, and when investing the money beats paying it down.
Oct 12, 2026Read
Trading10 min
Trading Consistency Score: What Prop Firms Measure and How to Improve It
Topstep, FTMO, Apex and Take Profit Trader cap how much of your profit one day may carry. See each rule, the math of a $1,400 day and how to fix the ratio.
Oct 12, 2026Read
QR Codes8 min
How to Make a Linktree QR Code for Print That Lasts
Make a QR code for your Linktree that survives a platform switch: direct vs dynamic codes, Linktree plan costs per year, and what one reprint really costs.
Oct 11, 2026Read
Debt10 min
Debt Payments Are Rising 8x Faster Than Pay: What to Do
Debt payments grew 14.8% since 2022 while real pay rose 1.7%. What that means for your raise, and a plan to keep more of it, worked on real numbers.
Oct 11, 2026Read
Investing9 min
2027 401(k) Limit Is $25,500: How September's CPI Settled It
The 2027 401(k) limit is $25,500: September CPI-U came in at 336.940, above the 335.122 line. Catch-ups of $8,500 and $11,750, the $75,000 total, and the math.
Oct 11, 2026Read
AI Costs10 min
n8n Pricing Explained: Cloud, Self-Hosted or Zapier?
What n8n really costs: cloud plans from €20, free self-hosting and the AI model bill on top. One AI workflow priced at 1k, 10k and 100k runs vs Zapier and Make.
Oct 9, 2026Read
Taxes10 min
Mileage Reimbursement in 2026: How to Get Paid Tax-Free
The IRS mileage rate rose to 76¢ on July 1, 2026. What your log must show, the 60-day rule that keeps reimbursement off your W-2 and what a car allowance costs.
Oct 9, 2026Read
Taxes10 min
HSA vs FSA for 2027: Which One to Pick at Open Enrollment
HSA vs FSA for 2027: the new $4,500 and $9,000 HSA limits, FSA carryover rules, what each saves at $45k, $85k and $160k, and when an FSA loses you money.
Oct 9, 2026Read
Rentals10 min
What Is a Good Cap Rate for a Rental at 7%+ Mortgage Rates?
Cap rate, cash-on-cash and negative leverage on one $350,000 rental at today's 7%+ mortgage rates — what a good cap rate is and the price that makes it work.
Oct 8, 2026Read
Trading10 min
Revenge Trading: How to Spot It in Your Trading Journal
Revenge trading leaves four fingerprints in a trade log: time, size, pace and broken rules. See what chasing losses does to a winning strategy over a year.
Oct 8, 2026Read
Investing11 min
The $1,000 Saver's Match Starts in 2027: Who Qualifies
From 2027 the IRS adds up to $1,000 a year to your 401(k) or IRA. Income limits, how the match phases out, how to claim it and what it grows to by 67.
Oct 8, 2026Read
123 more guides, sorted by topic.
These are the newest. Every guide we have published is filed under one of the topics beside this grid — open the one you need and you get that subject from the beginning.