Tattoo Shop input evidence register
45 financial inputs with their assumptions, calculation bases and cited sources.
Read the supported claim, observation period, geography and units together. A source access date records when it was consulted. A model assumption identifies a selected amount or target; a calculated result follows from those inputs and does not establish observed demand or a quoted opening budget.
Case updated October 5, 2026. These notes accompany the complete case methodology and source register.
Dataset use notice: no Creative Commons license or DOI is asserted. Referenced material remains subject to its publisher’s terms.
These notes explain the opening budget, annual forecast and calculator assumptions. Linked sources provide the support described in each note; they do not necessarily confirm the selected amounts. Check scenario assumptions against local quotes and operating records.
- Model assumption
Applies to: Total opening budget · Lower opening budget · Upper opening budget · Leasehold work, handwashing and washable finishes · Two stations: chairs, stools, carts and lighting · Machines, power, stencil and design equipment · Opening sterile instruments and hygiene stock · Reception, payment tools, signage and security · Deposits, design, permissions, legal and opening insurance · Paid pre-opening training and launch · Working capital retained for the operating ramp
Complete private lower/base/higher allocations reconcile to $100,000/$170,000/$290,000. Base setup is $105,000 plus a $65,000 reserve. The chair and $42.99/20 cartridge references are listed out-of-stock components, not delivered studio/kit quotes. The SBA supports separate setup/monthly budgeting; neither it nor the vendors supports the selected totals.
- Model assumption
Applies to: Net tattoo charge per completed session (lower sensitivity) · Net tattoo charge per completed session (base scenario) · Net tattoo charge per completed session (upper sensitivity)
Selected $250/$400/$650 completed-session ticket sensitivities. Base mix 30% at $150, 50% at $400 and 20% at $775 gives $400. Provider rates/minima support concrete pricing context, not these shares, ticket endpoints or attainable local prices. Deposit credit is included once; tips, tax and ancillary sales are excluded.
- Model assumption
Applies to: Completed tattoo sessions across both artists per day (lower sensitivity) · Completed tattoo sessions across both artists per day (base scenario) · Completed tattoo sessions across both artists per day (upper sensitivity) · Trading days per week (lower sensitivity) · Trading days per week (base scenario) · Trading days per week (upper sensitivity)
Selected 2/4/5 whole completed sessions across both artists per day and 4/5/6 trading-day sensitivity. The 64-hour weekly reservable roster, 2.425-hour weighted block and 90% completion support four/day on five days. Five/day on five days requires at least 94.7266% completion. High ticket/day/volume settings are not jointly feasible without a revised mix or roster. Sources do not measure the selected time or completion assumptions.
- Model assumption
Applies to: Monthly fixed operating costs · Contribution margin
Monthly fixed $23,000 equals annual payroll $212,000 plus overhead $64,000 divided by 12. Supplies 12% plus blended processing 3% leave 85% contribution before fixed wages. No commission is assumed. The 15% employer burden and selected wages/overhead are estimates; IRS supplies federal tax/control rules, Square supplies plan/tender-dependent fees and OSHA supports funded employee duties, not these totals.
- Model assumption
Applies to: Opening sales as a share of mature volume · Monthly increase toward mature volume · Forecast horizon (months)
Selected ramp starts at 50% of mature completion volume, rises four percentage points each month and is displayed for 18 months. It reaches full volume in month 14. The cash test accumulates monthly operating deficits; no source demonstrates this booking trajectory.
- Model assumption
Applies to: Revenue (Years 1–5) · Session supplies and payment processing (Years 1–5)
Years 1-3 aggregate the monthly ramp using 4.33 weeks/month and round annual USD values. Variable costs are 15% of sales. Years 4-5 assume $410/$420 tickets and 4.2/4.4 average daily completions within the same duration/roster envelope. Price, volume growth, mix and constant percentage consumables are assumptions; provider/product facts do not establish a tattoo-industry forecast.
- Model assumption
Applies to: Paid owner, employee artist, reception and burden (Years 1–5) · Premises, insurance, waste and operating overhead (Years 1–5)
Years 1-3 fund $80,000 working-owner equivalent, $80,000 employee artist, $20,800 reception, a 15% assumed burden and $4,080 relief = $212,000 payroll. Overhead comprises $33,000 occupancy and $31,000 other costs. Years 4-5 increase each fixed category by 4% per year with whole-dollar rounding. Recruitment pay, 15% burden, 4% inflation and overhead are selected, not verified local rates.