Bookkeeping for Phone Repair Shops: Margin Guide

Phone repair is a high-margin trade — a single screen or battery job can carry a 50–70% gross margin — but only if you actually know your numbers. Plenty of busy shops feel profitable while quietly losing money on under-priced repairs, dead inventory, and fees they never tracked. Good bookkeeping for a repair shop doesn’t have to be complicated; it just has to capture the real cost of every part and every sale so you can see your true margin. This guide walks through how to set up clean, useful books for a phone repair business — and the few metrics that tell you whether you’re building wealth or just staying busy. It also serves the mission: when you fix and resell devices instead of scrapping them, you keep hardware alive and e-waste out of landfills, and clean books are what let you do that profitably.

Why repair-shop bookkeeping is different

A repair shop is not a pure service business and not a pure retailer — it’s both at once. Every job blends a physical product (the part you install) with labor (the time to install it). That mix changes how you should keep your books in three important ways:

• Parts are inventory, not instant expenses. A box of screens you bought last week is an asset sitting on your shelf until you actually use it. Treating that purchase as an immediate expense distorts every month it touches.
• Labor has a real cost. Even if you’re the only technician, your time has a value. A repair that “makes $40 in parts margin” but takes an hour of skilled labor may barely break even.
• Margin lives at the per-repair level. Your overall monthly profit hides which services pay and which ones you do as a favor. The money is in the detail.

Generic small-business bookkeeping advice ignores all three — which is why so many shop owners are surprised at tax time. Their books were never built to show cost of goods sold or margin per job.

Track real margin per repair

The cost of a repair isn’t just the part. Your real cost per job includes the landed part cost, the consumables, and your labor. Assign all of it to each repair type and you’ll quickly see which services actually earn and which ones are barely worth opening the case for.

• The part itself — the landed cost of the screen, battery, or component, including shipping to get it to you. A $22 part with $3 of shipping costs you $25, not $22.
• Consumables — adhesive, tempered glass, isopropyl alcohol, gloves, and the small stuff that adds up across hundreds of jobs. Budget a flat per-repair amount (often $1–$3) so it never goes untracked.
• Labor — your time or your technician’s, costed at a real loaded hourly rate (wage plus payroll taxes).
• Rework and warranty — the occasional defective part or callback. Track it as its own line, because it silently eats margin.

Here is a simple margin-per-repair breakdown for three common jobs. Build the same table for your top services and you’ll instantly see where the real money is.

Repair	Price charged	Part (landed)	Consumables	Labor cost	Gross profit	Margin %
iPhone 13 screen	$129	$48	$3	$18	$60	47%
iPhone 13 battery	$69	$14	$2	$12	$41	59%
Charging port repair	$89	$9	$2	$30	$48	54%

Notice how the battery job — the cheapest ticket — carries the highest margin percentage, while the charging port repair eats the most labor. That kind of insight only shows up when you cost every component of the job. Sourcing parts at the right price is half the battle; see our model-by-model guide to phone battery replacement by model and stock from a reliable wholesale cell phone parts supplier to protect that margin.

Handle parts inventory and COGS the right way

The most common shop bookkeeping mistake is expensing parts the moment you buy them. The cleaner approach: parts you’ve bought but haven’t used yet are inventory (an asset), and their cost only becomes an expense — cost of goods sold (COGS) — when you actually install them in a repair or sell them.

Why it matters: if you drop $4,000 on a bulk parts order in March, expensing it all at once makes March look like a loss and April look unrealistically profitable. Booking parts as inventory and moving them to COGS as you consume them gives you an honest gross-margin number every single month.

A practical workflow for a small shop:

• Record every parts purchase into an inventory asset account, not an expense account.
• Each time you complete a repair or sale, move that part’s cost from inventory to COGS.
• Do a physical count at least quarterly to reconcile your books against what’s on the shelf. The gap is shrinkage, breakage, or untracked rework.
• Watch for dead stock — parts for models nobody brings in anymore. Aging inventory ties up cash; discount, bundle, or sell it off. You can recover value on broken or surplus screens through an LCD buyback rather than letting them rot in a drawer.

Separate parts revenue from labor revenue

On your invoices and in your books, split each job into a parts line and a labor line. It takes a few extra seconds and pays off three ways:

• Cleaner margin analysis. You can see your markup on parts separately from the value of your labor, which tells you whether to adjust pricing on one or the other.
• Correct sales tax. Many states tax parts but not labor (more on this below). If parts and labor are jammed into one line, you can’t charge or remit tax correctly.
• Better pricing decisions. If labor is where your margin is thin, raising the labor charge $10 may be easier than squeezing your parts supplier.

Set up matching income accounts — “Parts Revenue” and “Service/Labor Revenue” — and your monthly profit and loss statement will show the two streams at a glance.

Cash vs. accrual: the basics

You’ll keep your books on one of two methods:

• Cash basis records income when money hits your account and expenses when you pay them. It’s simple and fine for very small, cash-paid shops with little inventory.
• Accrual basis records income when you earn it and expenses when you incur them, regardless of when cash moves. Because accrual properly matches a part’s cost to the sale it belongs to, it gives a far more accurate margin picture — which is exactly what an inventory business needs.

The practical takeaway for repair shops: once you carry meaningful inventory, lean toward accrual (or at least track inventory and COGS the accrual way even if your tax return uses a hybrid method). The IRS may also require accrual once you exceed certain revenue thresholds, so check current rules or ask your accountant before you grow.

Sales tax on parts and labor

Sales tax is where repair shops most often trip up, because the rules genuinely differ by state:

• Some states tax the parts but exempt the labor.
• Some tax both parts and labor on a repair.
• Some treat a single combined repair charge differently than itemized parts-plus-labor.

This is the practical reason to separate parts and labor on every invoice — it lets you apply tax only where your state requires it. You’ll also want a resale certificate so you buy parts tax-free from suppliers and only collect tax once, from the end customer. Register for a sales tax permit in your state, charge the correct rate, and set aside what you collect in a separate bucket so it’s never spent. Sales tax you collect is not your money; it’s money you’re holding for the state.

Choose the right tools: spreadsheet vs. software

Match the tooling to your size, not to what sounds impressive:

• Solo / kiosk: a simple spreadsheet — one row per repair with part landed cost, consumables, labor, price charged, and profit — is genuinely enough when volume is low.
• Growing storefront: move to QuickBooks Online or Xero so income, parts (COGS), inventory, and expenses reconcile automatically and your P&L is always current. Both connect to your bank and handle sales tax tracking.
• Repair + online resale: add marketplace-aware accounting like BeanHawk so platform fees, refunds, and the reimbursements Amazon owes you for lost or damaged stock don’t distort your real margin when you sell parts or refurbished devices online. It posts each Amazon, eBay, or Shopify payout to QuickBooks or Xero as one clean entry, tracks true COGS per SKU, and even runs a free FBA reimbursement audit to surface money you’re already owed.

Whatever you choose, the goal is the same: books clean enough to answer one question — which repairs and which products actually make money?

The key metrics every repair shop should watch

You don’t need a finance degree. Watch these four numbers monthly and you’ll catch problems early:

• Gross margin % — (Revenue − COGS) ÷ Revenue. For a healthy repair shop this often runs 45–65%. A falling trend means parts costs are creeping up or pricing has slipped.
• Average ticket — total repair revenue ÷ number of jobs. Rising average ticket (through add-ons like screen protectors or premium parts) grows profit without more foot traffic.
• Inventory turns — annual COGS ÷ average inventory value. Higher turns mean cash isn’t trapped on the shelf. Low turns flag dead stock to clear out.
• Net profit margin — what’s left after rent, payroll, software, and everything else. Gross margin can look great while overhead quietly eats the bottom line.

Here’s a simplified sample monthly P&L for a small shop to show how these pieces fit together:

Line item	Amount
Parts revenue	$9,200
Labor / service revenue	$6,800
Total revenue	$16,000
Cost of goods sold (parts + consumables)	$6,400
Gross profit	$9,600 (60%)
Rent	$1,800
Payroll (1 tech)	$3,200
Software, utilities, marketing	$900
Merchant / processing fees	$450
Net profit	$3,250 (20%)

A 60% gross margin looks fantastic, but overhead pulls net margin down to 20% — which is why you track both numbers, not just one.

Tax-deduction basics for a repair shop

Keep documented records and you can legitimately deduct the ordinary, necessary costs of running the shop. Common deductions include:

• Parts and inventory — deducted through COGS as you sell or use them.
• Tools and equipment — soldering stations, microscopes, heat plates, test rigs (often expensed immediately under Section 179 or depreciated).
• Rent, utilities, and insurance for your shop space.
• Software subscriptions — accounting, POS, repair-ticketing tools.
• Marketing — website, local ads, signage.
• Vehicle and mileage if you do pickups, deliveries, or supply runs.
• Merchant and marketplace fees — card processing, eBay/Amazon referral and fulfillment fees.

One more thing to expect: if you sell through marketplaces or card processors, you’ll receive a 1099-K reporting gross payments before any fees or costs — so it will look far larger than your actual profit. As long as you’ve recorded documented parts costs, fees, and labor, your taxable income will land where it should. This isn’t tax advice for your specific situation; confirm the details with a CPA.

Stock smart, price on real margin, keep clean books — that’s how a repair shop turns “repair, don’t replace” into a business that lasts. Source quality parts at the right cost from our replacement batteries collection and the rest of the catalog, and your margin math gets a whole lot easier.

FAQ

How do I track profit per repair?

Record the full cost of each job — the part’s landed cost, consumables, and your labor at a real hourly rate — against what you charge the customer. Subtract any marketplace or payment-processing fees on online sales. The difference is your true gross profit, which is usually lower than the simple part-vs-price gap suggests.

What accounting software is best for a repair shop?

For most growing shops, QuickBooks Online or Xero is the sweet spot — both handle inventory, COGS, sales tax, and bank reconciliation. A spreadsheet is fine while you’re solo and low-volume. If you also sell parts or refurbished phones on Amazon or eBay, add marketplace-aware software such as BeanHawk so platform fees, refunds, and FBA reimbursements are booked correctly instead of quietly distorting your margin.

Do I charge sales tax on phone repairs?

It depends on your state. Some tax the parts but not the labor, some tax both, and rules differ for combined versus itemized invoices. Separate parts and labor on every invoice, register for a sales tax permit, and use a resale certificate to buy parts tax-free. Check your state’s current guidance or ask a local tax pro.

Should I treat parts as inventory or as an expense?

Treat unused parts as inventory (an asset). Their cost only becomes an expense — cost of goods sold — when you install them in a repair or sell them. This keeps a big bulk order from making one month look like a loss and gives you an accurate monthly gross margin.

What is a good gross margin for a phone repair shop?

Most healthy repair shops run a 45–65% gross margin after parts and consumables. Net profit margin after rent, payroll, and overhead is typically much lower — often 10–25% — so track both numbers, not just gross.

Cash or accrual accounting — which should I use?

Cash basis is fine for a very small, low-inventory shop. Once you carry meaningful parts inventory, accrual (which matches a part’s cost to the sale it belongs to) gives a far more accurate margin picture and may be required above certain revenue thresholds. Confirm current IRS rules with your accountant.