4 August 2026
Getting the VAT margin scheme right on used devices
A plain-English walk-through of margin VAT for second-hand phones — and how to avoid over-declaring.
Read full blog: Getting the VAT margin scheme right on used devicesBuilt for repair shops and device traders
Run your repair shop the calm way
Take payments, track every device by IMEI, manage repairs and reorder stock from your suppliers — all from one tidy counter-to-back-office platform.
The problem
Where repair shops lose time and money
None of these are the shop's fault. They are what happens when the till, the repair notebook and the stock sheet do not talk to each other.
A paid repair is edited later, and the bill no longer matches what was taken.
A customer underpays and the difference quietly disappears.
A handset is sold without the right serial reference against it.
A part is used on a job but stock is never reduced.
The invoice and the report show different totals for the same week.
A supplier delivery does not match the order, and nobody catches it.
The connected system
One repair, followed all the way through
The same job from the counter to the ledger. Each step writes to the next, so nothing has to be re-entered and nothing changes silently.
- 01Repair bookedDevice, fault and customer captured against a ticket.
- 02Deposit takenPayment recorded against the job, balance tracked.
- 03Part reservedStock is committed to the ticket, not just noted.
- 04Technician assignedThe job joins a queue with an owner and a due time.
- 05Extra work quotedAdded cost is quoted on the ticket before it reaches the bill.
- 06Final paymentBalance settles across card, cash or store credit.
- 07Device handed overHandover closes the ticket and the stock movement.
- 08Invoice & warranty issuedThe document, the VAT and the report agree.
Because those steps are joined, a part used reduces stock, the stock movement lands in cost of goods, and cost of goods lands in the profit and loss — and none of it can be changed silently.
Built for the way repair shops and phone traders actually work
Storefront
Kiosk
Trade Counter
Online Store
Multi-Branch
Wholesale
Why SlickCell
What makes us different
Purpose-built for the phone-repair trade — not a generic till bolted onto a spreadsheet.
Purchase orders & receiving
Raise a purchase order, receive stock against it in full or in part, and keep supplier bills and returns with the order that created them.
IMEI-level device units
Every handset is its own record — specs, cost, condition and history tracked per unit.
VAT margin scheme
Second-hand margin VAT handled correctly, so your returns add up first time.
Multi-branch & trade-in credits
Run several shops from one login, move stock between them, and settle trade-ins as store credit.
The platform
Everything the counter needs, in one place
Every part of the shop on one set of records. Pick the part of the day you want to see.
app.slickcell.com/services/:id
Repairs
Book, track and hand over repairs
One ticket carries the device, the fault, the deposit, the parts committed to it and the handover. The money moves with the job because they are the same record.
Booked in → handed over, with the money correct at every step.
SlickCell Pro — POS Checkout Calculator · Northgate Branch
POS Checkout Calculator
2 lines · 2 unitsTotal £530.10
Amelia Rossi
Payment 1
Card / Contactless£330.10
Ref: 8842
Payment 2Remove
Cash£200.00
Change due: £0.00
Total due:£530.10
Amount collected:£530.10
Paid in full£0.00 due
POS & sales
A till that understands repairs and used stock
Ring up a repair, an accessory by quantity and a handset by its IMEI on the same sale, then settle it across more than one method.
Split payments across cash, card, bank transfer and store credit.
app.slickcell.com/sales
Invoicing & payments
Paid, due and change on every invoice
Each payment is recorded against the invoice it settles, so the balance is derived rather than typed — and a refund never quietly reopens a bill that was paid.
The balance is what the payments say it is, not a field someone edits.
app.slickcell.com/inventory
Inventory
Parts by quantity, devices one unit at a time
A handset is its own row with its own IMEI, condition, cost and price. Quantity is counted from the units on the shelf rather than typed into a box.
Two identical handsets are two records, because they cost different amounts.
app.slickcell.com/inventory
Purchase orders
What you ordered, what turned up, what you owe
Receive against the order you raised. A short delivery is visible at the moment it is booked in, not when the bill arrives three weeks later.
Ordered, received and billed are three separate numbers you can compare.
app.slickcell.com/reports
Reports & tax
Totals that open onto their records
Revenue, profit and tax read from the same ledger the till writes to, and every figure can be opened to see the invoices underneath it.
Margin-scheme tax is reported separately from standard-rate tax.
app.slickcell.com/employees
Workforce
Let staff use the system without handing over the shop
Roles decide who can discount, void, refund or see cost prices. Hours and technician load sit next to the tickets they belong to.
Refunds, voids and price edits are role-gated on the server, not just hidden.
app.slickcell.com/inventory
Supplier network
Order from a supplier who is already on the platform
Your purchase order arrives as their incoming order — not an email they retype. They confirm or re-quote, you approve line by line, and stock is reserved until the dispatch is confirmed.
Approving reserves the stock. Confirming the dispatch is what moves it.
app.slickcell.com/settings
Multi-branch
Several shops, one group view
Each branch keeps its own stock, staff and takings. The group view reads across them without merging anything, so a transfer is still a movement.
Stock stays branch-owned; the group view is a read, not a merge.
At the counter
Watch the till do the work
The two things worth seeing move rather than read about: a sale being rung up, and a phone standing in for a barcode scanner.
POS & Sales
A till that speaks fluent repair shop
Ring up repairs, accessories and second-hand devices, take split payments across card and cash, and print or text a receipt in seconds.
Split payments across cash, card, bank transfer and store credit.
SlickCell Pro — POS Checkout Calculator · Northgate Branch
POS Checkout Calculator
2 lines · 2 unitsTotal £530.10
Amelia Rossi
Payment 1
Card / Contactless£330.10
Ref: 8842
Payment 2Remove
Cash£200.00
Change due: £0.00
Total due:£530.10
Amount collected:£530.10
Paid in full£0.00 due
Mobile scanning
Turn any phone into a barcode scanner
Show the QR on the till, scan it with a staff phone, and start scanning stock straight into the open sale. No scanner hardware, no app to install, and no login on the phone.
No cost, no margin, no customer details, and it cannot change a price or take payment.
Product proof
Look at the paperwork, not a quote
Three things you can inspect. If the documents are right, the system underneath is right.
SlickCell Pro — Receipt · 80mm
Northgate Device Care
Unit 4, Northgate Retail Park
RECEIPT · INV-00048
23/07/2026, 14:32:00
Bill To:Hannah Vogel
Screen Replacement — iPhone 12
1 × £89.00 · VAT 20% · tax £17.80£89.00Tempered Glass Screen Protector
2 × £7.50 · VAT 20% · tax £3.00£15.00
Subtotal (ex-tax)£104.00
Tax£20.80
Total£124.80
Payments received£124.80
Change£5.20
Balance due£0.00
StatusPaid
Payments
- Card · ****4242 · 23/07/2026£100.00
- Cash · 23/07/2026£24.80
Thank you for your business.
A split-payment receipt
One sale settled across card and cash. The tenders add up to the total, the change is what went back over the counter, and the balance lands on zero — the case where money usually goes missing.
SlickCell Pro — Inventory · iPhone 13 128GB
Device Units (IMEI / Serial)
3 unitsTotal 3 · Available 2 · Sold 1£440.00
Total Stock Value (available × cost)
- 1 353915107721480Sold
128GB · Midnight · Grade A · 91% · Unlocked
Cost £235.00 · Sell £319.00INV-00051T. Novak - 2 353915107693122Available
128GB · Starlight · Grade A · 88% · Unlocked
Cost £228.00 · Sell £309.00 - 3 353915107705518Available
128GB · Blue · Grade B · 84% · Unlocked
Cost £212.00 · Sell £289.00
Stock MovementsAll items
- POS Sale23 Jul 2026−1iPhone 13 128GBDEV-IP13-128IMEI: …721480
3 → 2 units · available → sold · INV-00051
- POS Sale23 Jul 2026−2Tempered Glass Screen ProtectorACC-TGP-13
40 → 38 units · INV-00048
- Purchase Received12 Jun 2026+1iPhone 13 128GBDEV-IP13-128IMEI: …721480
2 → 3 units · → available · GRN-0018
A device unit's history
One handset by IMEI: what it cost, what it sold for, its condition — and the stock ledger that recorded it arriving and leaving. Quantity is derived from units, never typed.
SlickCell Pro — Reports · Revenue · Today, 23 Jul 2026
Total Revenue
£593.80
Invoiced (accrual basis) · all channels
Transactions
4
Completed
Avg Order Value
£148.45
Per transaction
Revenue Breakdown
Today · 23 Jul 2026 · 4 invoices
- INV-00048Repair£124.80View detailsHannah Vogel · paidtax £20.80 · paid £124.80
- INV-00049Sale£54.00View detailsMarcus Adeyemi · paid-£6.00 · tax £9.00 · paid £54.00
- INV-00050Repair£96.00View detailsRachel Okonjo · partially_paidtax £16.00 · paid £60.00
- INV-00051Sale£319.00View detailsTomas Novak · paidtax £14.00 · paid £319.00
TOTALS£593.80
-£6.00 · tax £59.80 · paid £557.80
A report total, and its source
The revenue figure and the invoices it is made of, on the same screen — the rows add up to the total exactly. The report is not a separate number; it is the same number, traced.
Overview
A clear, uncluttered shop dashboard
Today at a glance
Takings, open repairs and jobs due out — the moment you open up.
Numbers you can trust
Every figure traces back to the record it came from — no second spreadsheet.
Jump to any screen
⌘K opens a finder for every page, tab and action — no hunting through a sidebar.
Ten one-click jobs
A repair, a sale, a trade-in, a stocktake — and you only see the tiles your role can use.
Every device tracked by IMEI
One handset is one record. Quantity is derived from units, never typed.
Margin-scheme VAT built in
Second-hand VAT is computed on the margin and kept off the invoice.
One login across every branch
Each shop keeps its own stock and staff under shared ownership.
Integrations
Connects to the tools you already use
From card payments to your label printer — SlickCell Pro fits the kit on your counter.
Stripe Connect card payments
Barcode scanning
CSV import & export
SMTP email
Thermal & label printing
PDF documents
Google sign-in
Risk reduction
What happens if something goes wrong
Moving a shop onto new software is the real decision. These are the parts that make it reversible.
- Migration
- Bring parts, accessories and devices in from a spreadsheet, and preview exactly what the import will do before anything is written.
- Role permissions
- Staff see and change what their role allows — refunds, voids and price edits are gated.
- Audit trail
- Money and stock movements are recorded with who did what and when.
- Your country, your tax rules
- Pick your country and the currency follows. Tax is a rule you set — a rate, inclusive, exclusive or margin — scoped to devices, parts or accessories, and to new or used stock.
- Printing that matches
- Receipts, A4 invoices, tickets and shelf labels come off one template, so the PDF, the thermal roll and the printed page all say the same thing.
- A link the customer can check
- The QR on a ticket or invoice opens a status page for that job — no login, no account, and search engines are told not to index it.
- Support
- Email support on every plan, priority on Professional and above.
Every SlickCell feature is included on every plan — plans differ by team size, locations, discounts and support.
Plans
Four plans, one feature set
Flat monthly pricing. Never per device, never per transaction.
2 months free
Starter
£39.00/mo
excludes VAT
One location, everything you need to open up and trade.
- Every SlickCell feature included
- 3 app-access users
- 5 employee profiles
- Single location
- Manual one-off discounts
- Standard email support
Professional
Most Popular£59.00/mo
excludes VAT
Multiple locations, discount rules and priority processing.
- Every SlickCell feature included
- 10 app-access users per branch
- 15 employee profiles per branch
- Multiple locations
- Discount rules, promo codes & automatic campaigns
- Priority large-job processing
- Custom domain
- Monthly backups
- Priority email support
- Additional branches £29.00/mo each
Supplier Pro
£99.00/mo
excludes VAT
Adds Supplier Operations and weekly backups.
- Every SlickCell feature included
- 15 app-access users per branch
- 25 employee profiles per branch
- Multiple locations
- Supplier Operations included
- Discount rules, promo codes & automatic campaigns
- Priority large-job processing
- Custom domain
- Weekly backups
- Priority support
- Additional locations £59.00/mo each
Enterprise
Custom pricing
Tailored to your organisation.
- Every SlickCell feature included
- Unlimited app-access users
- Unlimited employee profiles
- Unlimited locations
- Supplier Operations included
- Discount rules, promo codes & automatic campaigns
- Super-fast large-job processing
- Custom domain
- Separate dedicated database
- Dedicated account manager
- Weekly backups
- Priority or contractual support
Frequently asked questions
The quick answers. Can't find yours? Talk to our team.
Yes. Repairs, IMEI-level device inventory and the VAT margin scheme are all first-class — not add-ons bolted onto a generic till.
You can. Run several shops from one login, move stock between branches and see reports per branch or across the whole group.
Every handset is its own unit with its own IMEI, cost, condition and history. Quantities are derived from those units, so your counts stay honest.
Yes — card and cash, including split payments across both in a single sale, with receipts by print or email.
Yes — from a spreadsheet, with parts, accessories and devices imported separately. Prices go in as pounds and suppliers are selected by supplier ID. A device reference can be a full IMEI, a serial number, the last few digits or your own shop reference, and you preview what the import will do before anything is written.
Blog
Writing for the repair trade
Practical reads on running a tidier, more profitable repair shop.
4 August 2026
Why IMEI-level stock beats a quantity count
Tracking each device as its own unit changes what you can see, sell and trust on the shelf.
Read full blog: Why IMEI-level stock beats a quantity count
4 August 2026
Purchase orders, receiving, and the gap in between
Why booking stock in against the order you raised is what stops a short delivery quietly becoming your problem.
Read full blog: Purchase orders, receiving, and the gap in betweenGet Started
Ready to run your shop the calm way?
Start a 14-day trial on any plan, or see it on your own counter first.