| Cleaning | Service address that is often not the billing address, because property managers pay for a property they do not live in | Per visit, or flat by home size | Which visit dates this invoice actually covers |
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| Contractor | Retention holdback and a change-order reference tying the bill to what was approved | Fixed price, time and materials, or progress draws | The change-order reference for work added after signing |
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| Handyman | Trip fee and a disclosed parts markup on jobs too small for a formal estimate | Hourly plus parts | Disclosing the trip fee before the visit, not on the invoice |
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| Electrician | License number, which several states require on the invoice itself, plus the permit number | Service call, flat rate, or time and materials | Permit number and which inspection stage the invoice covers |
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| Plumbing | Whether the job is a repair or a capital improvement, because the sales tax rule differs | Service call, flat rate, or emergency call-out | Stating which tax treatment was applied and why |
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| HVAC | Equipment separated from labor, and maintenance-plan visits billed against a plan | Diagnostic then approved repair, or a maintenance plan | The after-hours multiplier the customer agreed to on the phone |
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| Automotive repair | Parts taxable while labor is not, plus core charges and their matching credit | Flat labor hours plus parts | The written authorization record for work found after disassembly |
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| Painter | Coats and surface prep as their own lines, and a deposit credited back | Per room or whole-job quote | Crediting the deposit as its own line so the balance due is unambiguous |
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| Landscaping | Recurring visits alongside one-off installs, with materials such as mulch billed separately | Per visit, or per project | Which visits in the billing period the invoice covers |
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| Freelance | W-9 details and revision rounds, with no sales tax on services in most states | Hourly, milestone, or retainer | Late-fee terms, which only hold if agreed before the work |
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| Consulting | Retainer drawdown showing what the retainer covered and what exceeded it | Monthly retainer, or fixed fee with milestones | How overage beyond the retainer was calculated |
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| Photography | Usage rights granted, which decide what the client may legally do with the images | Session or day rate | Stating exactly which usage rights are included |
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| Catering | Per-head pricing against a guest count that moves after booking | Per head plus a booking deposit | The headcount cutoff date the final count was locked against |
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