Money math and professional order, explained plainly.
Short, useful guides on the numbers and rules behind loans, licenses, leases, and ledgers — and the spreadsheets that make them behave like software.
ConstructionHow to level construction bids: the lowest number is often just the emptiest one
Why raw bid totals aren't comparable, how scope gaps hide in excluded and no-bid lines, what a plug value is — and a worked example where leveling flips the low bidder and collapses a $13,200 spread to $3,200.
Read the guide → ConstructionHow construction loan draws actually work: earned value, draw requests, and the interest meter
The loan funds work, not plans: budget × % complete = earned, earned − drawn = the request. Plus the actual/365 interest math on funded dollars, and the two set-asides that shrink your budget before the first shovel.
Read the guide → HomeownerBudget a renovation by trade, not by room — because that's how you'll be billed
Contractors bid, schedule, and invoice by trade in build order, so a room-by-room budget can't track the money. Build-order lines with room tags, contingency held on top, and variance that only counts finished lines.
Read the guide → Landlord & propertyThe lease renewal timeline: when to start, notice deadlines, and the math of an empty month
The 90-day method, the one subtraction behind every notice deadline (lease end − notice days), and the renewal-vs-turnover arithmetic — $2,750 of turnover against a $900/year increase — that decides most rent conversations.
Read the guide → Short-term rentalThe seven messages every guest should get — and when to send each one
The messaging timeline of a well-run stay — booking to review request — why templates beat typing, the honest (platform-compliant) way to ask for reviews, and the four issue replies to write before you need them.
Read the guide → Landlord & rental opsThe deposit dispute is won at move-in, not move-out
Rate items, not rooms; compare the same scale at move-out; and let the changed-flags — including the ones you don't charge for — build the record that survives small claims.
Read the guide → Bar & beverage opsPour cost: the number that runs a bar
Cost the bottle once, count what's in the glass, and read every drink against a target. The blended number beats the list average, and the workhorse is dollars per night, not margin percent.
Read the guide → Makers & market vendorsBooth fee math: when a show is worth the table
Net of fee, per day out, honestly logged — the number that picks next season's calendar. Plus the pricing truth craft folklore skips: materials % is not your margin.
Read the guide → Breeders & kennelsThe kennel book: litters, deposits, and money that can't blur
Due-at-go-home versus owed-after-pickup, expenses tagged per litter with health testing first-class, and why a young litter honestly reads negative before pickup week.
Read the guide → Tattoo artistsStation rent math: the books of renting a chair
Rent accrues whether you tattoo or not — weeks × rate against payments logged. Plus the rate-card column that finds the piece underpaying the hour.
Read the guide → Massage & bodywork opsPrepaid packages: the countdown that keeps a massage practice honest
Purchased minus received, per client — amber at the renew talk, red past the package. Package credit is a negative balance, and that's a feature.
Read the guide → Music teachersLesson packages: the countdown that keeps a studio solvent
One log line per lesson; the roster fills itself. Make-ups, sibling rates, and recital comps handled with rate overrides — without breaking the books.
Read the guide → Flipping & resaleCar flipping math: the all-in number your memory keeps rounding down
Buy price plus every receipt equals all-in; net stays honest at sale — losses in red, kept visible on purpose. Days held, profit per day, cash in the driveway, and the dealer-license reality every flipper must know first.
Read the guide → Property & storage opsRunning a small storage facility on a ledger, not a shoebox
Storage billing is arithmetic: months × rate = charged, charged − paid = the balance — no invoices. Occupancy by size, the delinquency list, and the vacancy bleed that prices every empty door.
Read the guide → Detailing & servicesHow to price car detailing: divide by the hours, not the vibes
Every package has an hourly rate, and the flagship SUV detail is usually the worst one — the earns-per-hour math that finds the leak, the price-at-target formula that fixes it, and the job log that keeps estimates honest.
Read the guide → Vending & routesDo vending machines make money? Only the ledger knows.
The cash box shows gross. Net per stop after the location's cut and product at cost, payback percent against each machine's cost basis, and the laggard the box was hiding — $38 of net in seven months.
Read the guide → Café & coffee barsWhat a latte actually costs to make (and where the answer hides)
Beans by the shot, milk by the ounce, packaging in every recipe — the honest cup cost, the modified drink whose COGS quietly creeps to 33%, and the day mix that turns a dime per drink into real money.
Read the guide → Tutors & lessonsPrepaid tutoring packages: the two promises that drift apart by March
Hours purchased vs. hours taught, billed vs. paid — the countdown that triggers renewal calls while there's package left, and the balance column that keeps invoices from becoming archaeology.
Read the guide → Boards & volunteersYou're the new PTA treasurer. Here's the whole job in four habits.
The one-tag money log, honest fundraiser P&Ls against the goals the board voted, budget vs. actual by committee, and the monthly cash reconciliation — everything the September meeting will ask, pre-answered.
Read the guide → Salon & chair rentersBooth rent math: what the chair really costs, and what your hour really pays
The chair as a meter that never waits, earns-per-hour pricing that exposes which services underpay after product and time, the double-count trap — and take-home as one honest subtraction.
Read the guide → Events & rental opsThe overbooked Saturday: how rental inventory tracking actually works
Booking lines as the spine, availability as arithmetic, the cancelled booking that must release its gear automatically, past-event balances that turn red — and revenue per unit owned, the column that ranks the fleet honestly.
Read the guide → Farm & agricultureFarm records that survive tax season (and tell you which enterprise made money)
Code every dollar to an enterprise, keep the cash view honest through the spring squeeze, break capital purchases out instead of burying them, and hand your tax preparer a Schedule-F-shaped year — with the boundaries stated plainly.
Read the guide → Church & nonprofitYear-end giving statements: the January job, and the system that does it
What a contribution statement typically includes, how designated giving should be recorded so the by-fund view stays honest, the one-log habit that makes forty statements an afternoon instead of a week — and the parts that are genuinely your tax professional's call.
Read the guide → FreelancingQuarterly estimated taxes, explained calmly
The pay-as-you-go rule, the four uneven deadlines (June's two-month "quarter" ambushes everyone), safe harbors, the 15.3% self-employment surprise, and the set-aside system that turns tax season into four boring transfers.
Read the guide → Real estate investingWhat is ARV? Estimating after-repair value without fooling yourself
Sold comps, not listings; renovated comps, not averages; the neighborhood ceiling; the seller's number rebuilt from scratch — and why a 5% ARV miss quietly takes $14,500 straight out of a deal's margin.
Read the guide → Landlord & propertyWhat can a landlord deduct from a security deposit? (And what you can't)
The wear-and-tear line drawn with examples — nail holes vs. doorknob holes — plus the useful-life rule on carpets and paint, the itemized statement, and the move-in photos that settle disputes before they start.
Read the guide → ConstructionRetainage, explained: the 10% that's probably your profit
Why owners hold it, the accumulation math on a $500k job ($50,000 of your money by the end — likely more than your margin), stored materials, midpoint reductions, sub flow-down, and the closeout race that gets it released.
Read the guide → En español · SeguridadTemas de charlas de seguridad: un año de ideas, por categoría
Las doce categorías de riesgo que toda rotación anual debería cubrir — con temas de ejemplo para cada una, cómo ordenarlos por temporada y fase de obra, y la cuenta que convierte la lista en 52 semanas. En español.
Leer la guía → En español · SeguridadCómo hacer una charla de seguridad que la cuadrilla sí escucha
Un tema, dos minutos, tres preguntas, una firma — la estructura completa de la charla de seguridad, cómo elegir el tema por fase y temporada, y la hoja de registro que convierte la charla en documentación. En español.
Leer la guía → Small businessBookkeeping for the self-employed: two ledgers, one P&L, twenty minutes a month
The minimum viable system for a one-person business — money in with invoice status, money out with a short category list, a monthly net you actually read, and the honest boundary where a spreadsheet stops being enough.
Read the guide → Interior designWhat is FF&E? The schedule that turns a design into a project
Furniture, fixtures & equipment — the tip-the-building-and-shake-it test, FF&E vs the finish schedule, qty × unit discipline, the specified-to-installed pipeline, and why "value not yet ordered" is the number that saves you.
Read the guide → Money mathVelocity banking, honestly: what the line of credit actually does
A $250,000 mortgage simulated three ways — minimums, velocity banking, plain extra payments. The 30-to-13-year headline is real; the HELOC's share of it is about $2,400 over thirteen years. Where the power actually lives.
Read the guide → Landlord & propertyWhat is a rent roll? (And why even a three-unit landlord needs one)
One row per unit — what goes on it, why the lease-end column is the part that pays, the rent-roll-vs-rent-ledger distinction that keeps your books honest, and why a lender's first question is always this document.
Read the guide → Real estate investingThe 70% rule and BRRRR, explained with a worked deal
MAO = ARV × 70% − rehab, worked on a $290k-ARV deal that fails the screen yet still nets ~$21,900 flipped — why the rule is a filter, not a verdict, plus the BRRRR math: cash out, cash left in, cash flow, cash-on-cash.
Read the guide → ResellingReseller profit: the flip you remember vs. the number you keep
Two honest flips — one nets $29.50, one nets $1.30 — and the four numbers that tell you if reselling is working: true net after fees, sell-through rate, days to sell, and per-platform margin. Plus why the death pile is a number.
Read the guide → Money mathHow to budget by paycheck (because a month is not how you get paid)
Why monthly budgets fail biweekly earners — assign every bill to the check that pays it, fix the heavy-check problem with splits and due-date moves, run set-asides for irregular bills, and catch the two nearly-free checks a year.
Read the guide → Money mathDebt snowball vs. avalanche: which one actually pays off faster?
A five-debt, $35,700 example worked to the dollar — what each strategy costs, how much sooner you're free, why the gap between them is smaller than the internet thinks, and how to pick the one you'll actually finish.
Read the guide → Short-term rentalWhat to put in an Airbnb welcome book (the house manual that earns reviews)
The eight sections a great welcome book needs — quick reference, house manual, rules, local guide, safety, check-out — why it cuts repeat questions and lifts reviews, and whether to go printed, digital, or both.
Read the guide → Short-term rentalPar levels for Airbnb supplies: the hotel trick that means you never run short
What a par level is, how to set one for every consumable, the one-subtraction reorder math that turns "am I low?" into an exact shopping list, and how to restock a whole portfolio by property and category.
Read the guide → Short-term rentalThe Airbnb turnover checklist that protects your reviews
The eight zones to work so nothing gets skipped, the critical items a guest notices first, why consistency across cleaners is the whole point, and why a trackable checklist beats the printout you half-use and lose.
Read the guide → Short-term rentalAirbnb income & expense tracking: the numbers that tell you if you're actually profitable
Why gross bookings hide your real profit, the STR KPIs that matter (occupancy, ADR, RevPAR), how platform and cleaning fees change the math, and why per-property P&L beats one lumped total.
Read the guide → FreelancingFreelance invoicing basics: what a professional invoice needs and how to get paid faster
The fields every invoice must carry, how invoice numbering and payment terms like Net 30 work, why the aging report is your most useful number, and how to chase a late payment without burning the relationship.
Read the guide → FreelancingSelf-employed tax deductions & mileage: what to track so you stop overpaying
How Schedule C deductions and the mileage deduction actually work — business-use percentage on mixed expenses, standard mileage vs actual, the records the IRS wants, and why logging as you go beats reconstructing in April.
Read the guide → FreelancingHow to set your freelance rate: work backward from what you want to keep
Why copying someone else's rate leaves you broke, how to back into the hourly rate you actually need from take-home + overhead + tax set-aside, and why billable hours — not a fantasy 40 — is the number everyone gets wrong.
Read the guide → ConstructionThe daily construction report: why the boring log wins the delay claim
What belongs on a daily report, why a contemporaneous field log is the most valuable document when schedule and payment questions come up, how weather and man-hours build a delay record, and how to keep the habit alive.
Read the guide → ConstructionTime & material extra work: how to bill every extra
Why signed-but-unbilled extra work is where contractors quietly lose money — how T&M and force-account billing works, why the signed field ticket is the whole game, markup across labor/material/equipment, and tracking your unbilled exposure.
Read the guide → ConstructionPunch list vs closeout: how a construction job actually ends
The difference between the punch list (physical work) and closeout (documents), what substantial completion means, the deliverables an owner is owed, and why tracking both is what finally releases your retainage.
Read the guide → ConstructionTracking subcontractor certificates of insurance: what a COI is and why the dates matter
What a certificate of insurance is (and isn't), the coverages and endorsements to require from subs, why a lapsed COI is a claim waiting to land on you, and how to track the expiration dates so nobody works your site uncovered.
Read the guide → ConstructionSubmittals and RFIs, explained: the two logs that keep a job from stalling
What submittals and RFIs are, how they differ, why "ball-in-court" is the number that actually moves the job, and how a clean dated log protects both your schedule and your delay claim.
Read the guide → ConstructionSchedule of values & the payment application, explained
How construction progress billing works — the schedule of values that ties to the contract sum, the AIA-style application that foots every time, retainage on work and stored materials, and why only approved change orders move your contract.
Read the guide → ConstructionYour bid hit rate: the one number that tells you if bidding is working
What a hit rate really measures, why "bid more" is usually the wrong fix, the difference between winning bids and winning margin, and how to track a pipeline so the numbers run the front office.
Read the guide → ConstructionConstruction job costing, explained: the margin you'll actually make
Why a job leaks money one cost code at a time — committed vs actual, cost to complete, estimate at completion, and how change orders you forget to log become margin you already gave away.
Read the guide → Safety practiceThe safety paperwork every jobsite actually needs
The forms a site really runs on — pre-task plans, inspections, incident and near-miss reports — why near-misses are the number to watch, and how to keep the record without drowning in paper.
Read the guide → Landlord & propertyHow to screen tenants legally: Fair Housing & FCRA, in plain English
Written criteria first, the protected classes you can't decide on, the income rule applied to everyone the same, and the consent-and-adverse-action steps the FCRA requires.
Read the guide → Landlord & propertySecurity deposit return deadlines: how long landlords really have
What starts the clock, what an itemized statement needs, and why a missed return window can forfeit your deductions — plus the ledger that computes every deadline for you.
Read the guide → Safety practiceA year of toolbox talks: 52 topics that keep crews listening
The twelve hazard categories to rotate through, real example topics for each, how to time them to the season and the work — and how to turn a weekly scramble into a system.
Read the guide → Safety practiceHow to run a toolbox talk crews actually listen to
Two minutes of talking, two minutes of paperwork: topic choice, delivery in your own voice, three crew questions, and the sign-in flow that turns weekly talks into documentation.
Read the guide → Family & legacyHow to record a parent's or grandparent's stories — before the window closes
The gear you already own, ten questions that open people up, the session craft, and the archive system — from the method our own family built too late for one voice.
Read the guide → Money mathHow to read an amortization schedule (and beat it with extra payments)
Why your early payments are almost all interest, how the balance actually falls, and the honest math on what one extra $200 a month does to a 30-year loan.
Read the guide → Professional practiceTracking professional licenses across states: what actually works
Renewal cycles that never line up, CE hours in three flavors, and firm audits — a working system for multi-state professionals, from a licensed architect.
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