EPOS Accounting and Stock Integration Costs
Compare paid connections between your till, bookkeeping and stock systems, including setup, ongoing checks and the value of administration time saved.
The short answer
An accounting integration transfers financial records; a stock integration updates selected product or quantity information between systems. They are not necessarily the same connection. Compare the exact data transferred, required software plans and setup work, then measure how much administration remains. Automation does not remove the need to check the records.
In this guide
Define what the connection must transfer
| Connection | Examples to check |
|---|---|
| EPOS to accounting | Sales summaries, refunds, fees, payment totals and the right accounting categories. |
| Stock between sales channels | Product identifiers, variants, quantities, returns and the direction of updates. |
| Purchasing to accounts | Supplier invoices, purchase records and the supported treatment of stock costs. |
| Terminal to EPOS | Payment amounts and results; this is a separate integration question. |
Lightspeed’s Xero setup guidance includes account mappings and choices for inventory purchases, payment types and other records. It recommends accountant involvement in choosing the mappings. Square’s stock documentation separately illustrates how inventory tools depend on the relevant plan and devices. Check your exact products and versions.
Ask for a demonstration using your own record types
- Determine whether the connection sends individual sales or daily summaries.
- Confirm how refunds, discounts, fees, gift cards and mixed payment methods are represented.
- For stock, check variants, returns, transfers, bundles and sold-out items where relevant.
- Identify which system is authoritative when the same product is edited in two places.
- Check update frequency, failure alerts and how missing records can be reprocessed without duplication.
A successful sales transfer does not prove that all the exceptions work. Ask your bookkeeper to review a sample day with a refund, a fee deduction and a payout. For stock, reconcile a small set of real products before connecting the full catalogue.
Worked example: software cost versus time value
Fictional quote. An accounting connector costs £30 monthly, a separate stock connector costs £20 monthly, and setup costs £300. Existing EPOS and accounting subscriptions stay the same and are excluded from both options.
| Item | Calculation | Result |
|---|---|---|
| Additional monthly subscriptions | £30 + £20 | £50 |
| First-year cost | £300 + 12 × £50 | £900 |
| Illustrative time released | 4 hours monthly × £20 × 12 | £960 of annual capacity value |
| First-year time-value threshold | £900 ÷ £20 ÷ 12 | 3.75 hours monthly |
Four useful hours released each month would have an illustrative annual value £60 above the first-year cost. The business still spends £900 more unless a real expense is reduced. If the existing bookkeeper charges the same fee and staff hours stay the same, do not call the £960 a cash saving.
Measure time remaining after reviewing failed transfers, correcting records and maintaining the connection. If another required software upgrade adds a charge, include it before using the threshold.
Keep sales, fees and payouts distinguishable
A bank payout is not always the same amount as gross customer payments. In a simple example, £10,000 collected less £300 refunded and £150 in fees produces a £9,550 payout. Records need to explain those differences, rather than recording both the sales import and the payout as two separate sets of sales.
Timing differences, reserves and other adjustments can make actual reconciliation more complicated. Ask the bookkeeper to approve how the chosen connector represents them. This guide compares workflow and costs; it does not prescribe accounting or tax treatment for your business.
For stock, agree how failed or delayed updates are noticed and resolved. Check what happens during an outage and which records are retained if you stop the connector.
Review the ongoing service as well as setup
Obtain a quote showing each connector, required plan, site or volume limit, setup charge and support responsibility. Check who maintains the connection when either software product changes, and whether data can be exported when the subscription ends.
Use the calculator to compare additional software and setup costs alongside payment costs. Keep time saved, bookkeeping fee changes and stock benefits in separate evidence-based workings. For the connection that sends payment amounts to a terminal, see integrated payments versus a standalone terminal.
Extend the brief to bookings, ERP and CRM
Apply the same test to booking systems, ERP and CRM connections. Specify the records, direction of transfer, timing and exceptions: for example a deposit against a booking, an amended customer record, a partial refund or a stock adjustment.
Ask whether the connection is a supported standard integration or custom work. Price initial mapping, data cleaning, test imports, connector subscriptions, usage charges and future changes. Name the party responsible when one system changes and the transfer stops working.
Require a usable error report and an agreed reconciliation process. A successful demonstration of one sale does not establish that returns, duplicates and missing records are handled correctly.
Include this scope in the implementation budget, then assess the benefit with the ROI guide. Keep it within the full system cost comparison.
Common questions
Does an accounting integration also update stock everywhere?
Not necessarily. Confirm the exact data, direction and frequency of each connection. Financial stock values and product quantities across selling channels are different requirements.
Can I stop checking the accounts once the connection is live?
No. Establish a review process for missing or duplicate records, refunds, fees and payout differences. Automation should make the work easier to control, not leave errors unnoticed.
Take the next step
Use the equipment and software catalogue to build a specification, then ask the supplier to confirm the required accounting or stock connection, licence and support costs.
Put your own figures to work.
Use the free calculator to organise your costs and keep a report. If something is unclear, you can ask for a free initial review.
No registration required. Calculator entries stay in your open browser page unless you choose to share a report in a review request.
Sources and how to use this guide
Primary references checked on 15 October 2026:
- Lightspeed: Xero account mappings and integration setup
- Square UK: inventory tracking and plan requirements
Worked examples are original fictional scenarios, not customer results, market averages or provider quotations. Unless stated otherwise, they use a consistent VAT basis and include only the costs listed. Provider prices, eligibility and terms can change. Check your written agreement before deciding.
Our guides explain costs and comparison methods. They do not rank the whole market or claim hands-on product testing. Source links are references, not a claim of partnership. Read the calculation method and limitations, or about the service.