Best Accounting Software That Integrates With Your CRM UK 2026
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The Problem Nobody Warns You About
You win a client in your CRM, raise a quote, convert it to an invoice, chase payment — then manually type the same information into your accounting software. Again. Every time.
It’s the hidden tax on running a small business: rekeying data that already exists somewhere else. Errors creep in, invoices get missed, and your CRM says a client owes nothing while your accounts say otherwise.
Genuine, working integrations exist. The frustrating truth is that “integrates with” in vendor marketing can mean anything from full two-way invoice sync to sharing a contact name. This article covers what actually syncs, which tier you need, and what the combined stack really costs.
What a Good CRM–Accounting Integration Looks Like
At minimum it should sync:
- Contacts and company records — no rekeying client details
- Quotes and estimates — raised in one platform, visible in the other
- Invoices — created and updated in real time
- Payment status — when a client pays, both systems know
If it only pushes contacts across, that’s a mild convenience. If it syncs invoices and payment status both ways, it’s a genuine time-saver that keeps your sales and finance view of reality in sync.
A Note on VAT Before the Numbers
Worth flagging, because it affects every total below. Xero, QuickBooks and FreeAgent all quote ex-VAT. CRM pricing isn’t always stated on the same basis. If you’re not VAT-registered and can’t reclaim, add 20% to the accounting side before comparing stacks — and confirm the VAT treatment on the CRM side rather than assuming it matches.
The Best Accounting and CRM Stacks for UK Small Businesses in 2026
1. Xero + Capsule CRM — Best Overall for Small Businesses
Accounting: Xero · CRM: Capsule CRM
One of the most genuinely useful integrations available to UK small businesses, and it’s been running long enough to be battle-tested.
What actually syncs:
- Contacts sync between both platforms automatically
- Invoices raised in Xero appear on the relevant contact record in Capsule
- Invoice status — paid, overdue, draft — is visible inside Capsule
- You can see a client’s total invoiced value and outstanding balance without leaving your CRM
Your sales pipeline in Capsule reflects real financial data from Xero, which genuinely helps when deciding whether to chase a late payer or extend credit to a prospect.
Which tier do you need? This is where most coverage gets it wrong. Capsule’s premium integrations, including Xero, sit on the Starter plan at £14 per user per month billed annually — not on a “Professional” tier, which doesn’t exist in Capsule’s current four-plan structure. You don’t need to climb the ladder to connect your accounts.
The one thing to know: Capsule’s free plan doesn’t include it. Free covers 2 users and 250 contacts, but the integration requires Starter.
On the Xero side, note that Xero has renamed its plans — the old Starter, Standard and Premium are now Ignite, Grow, Comprehensive and Ultimate. The integration works across the range, so there’s no tier requirement on the accounting side.
Realistic monthly cost, two users:
| Product | Plan | Cost |
|---|---|---|
| Xero | Ignite | £16 ex-VAT |
| Capsule CRM | Starter, 2 users | £28 |
| Total | £44/month |
MTD compatibility: Xero is MTD for VAT compatible and submits VAT returns directly to HMRC.
Honest verdict: If you’re using or considering Xero, Capsule is the cleanest integration at this price. Invoice and payment visibility inside the CRM is what makes it stand out — and at £14 a user rather than the £18 often quoted, it’s better value than most comparisons suggest.
2. QuickBooks + Capsule CRM — Solid Alternative
Accounting: QuickBooks Online · CRM: Capsule CRM
Worth knowing if you’re already on QuickBooks or your accountant prefers it.
What actually syncs: broadly the same depth as the Xero version — contacts bidirectionally, invoices from QuickBooks on Capsule contact records, invoice and payment status visible in Capsule, and the ability to filter Capsule contacts by financial status. It runs through the same Capsule integration panel and behaves consistently.
Which tier do you need? Capsule Starter at £14 again. On the QuickBooks side, the integration works across Simple Start, Essentials and Plus.
Realistic monthly cost, two users:
| Product | Plan | Cost |
|---|---|---|
| QuickBooks Online | Simple Start | £16 ex-VAT |
| Capsule CRM | Starter, 2 users | £28 |
| Total | £44/month |
Note that QuickBooks also offers Sole Trader Plus at £10 ex-VAT below Simple Start — worth checking whether it carries the integration if you’re a sole trader watching every pound.
MTD compatibility: QuickBooks Online is MTD for VAT compatible with direct HMRC submission.
Honest verdict: On integration alone, Xero and QuickBooks through Capsule come to exactly the same £44 a month. So choose your accounting software on its own merits. QuickBooks tends to suit businesses with more complex stock or payroll needs.
3. Zoho Books + Zoho CRM — Deepest Integration, Lowest CRM Cost
Accounting: Zoho Books · CRM: Zoho CRM
If you want the deepest possible integration, the Zoho ecosystem is hard to beat. Both products come from the same company, so the integration is native — no third-party connector, no Zapier.
What actually syncs:
- Contacts and accounts bidirectionally
- Quotes raised in Zoho CRM push directly into Zoho Books
- Invoices created in Zoho Books sync back to Zoho CRM
- Payment status visible in the CRM
- Sales orders in Zoho CRM can automatically generate invoices in Zoho Books
This is the most complete quote-to-cash flow of any option here. CRM deal to quote to invoice to payment tracking, without rekeying.
Which tier do you need? Zoho CRM Standard at £12 per user per month billed annually (£16 monthly) — the integration isn’t on the free plan. Confirm the required Zoho Books tier directly, as Zoho Books pricing varies across sources.
Realistic CRM cost, two users: £24 a month for Zoho CRM Standard, plus Zoho Books on top.
At £12 a user, Zoho CRM is the cheapest CRM in this article — £2 below Capsule Starter — so if the Books side prices competitively, this is the lowest-cost complete stack.
MTD compatibility: Zoho Books is MTD for VAT compliant with direct HMRC submission.
Honest verdict: For maximum integration depth at a lower price, this is the standout. The trade-off is a steeper onboarding curve and lower UK accountant familiarity — if your accountant is Xero or QuickBooks trained, factor that in.
4. FreeAgent + HubSpot CRM via Zapier — Cheapest, With Real Caveats
Accounting: FreeAgent · CRM: HubSpot CRM (Free)
HubSpot’s free CRM is genuinely capable, and FreeAgent is popular with UK freelancers — partly because it’s free with a NatWest, Royal Bank of Scotland, Ulster Bank or Mettle business account. Mettle is the one most people miss, and it’s a free account in its own right.
What actually syncs — honestly: there is no native FreeAgent–HubSpot integration. You’ll need Zapier or similar, which means:
- You can sync contacts and trigger invoice creation from HubSpot deal stages
- But it’s one-way and trigger-based, not a live two-way sync
- Payment status does not update back in HubSpot without additional Zaps
- Zapier adds cost and a point of failure
Two limits to know. HubSpot’s free CRM is capped at two users, and FreeAgent is only free if you hold a qualifying bank account — otherwise it’s £19 a month ex-VAT for sole traders, £27 for partnerships and LLPs, £33 for limited companies.
Realistic monthly cost, one user with a qualifying bank account:
| Product | Plan | Cost |
|---|---|---|
| FreeAgent | Free via qualifying bank | £0 |
| HubSpot CRM | Free, up to 2 users | £0 |
| Zapier | Paid tier required | Check current pricing |
Without the bank account, add £19 to £33 depending on your business structure.
MTD compatibility: FreeAgent is MTD for VAT compliant and well regarded for self-assessment, which makes it particularly useful for sole traders.
Honest verdict: With a qualifying bank account this can be very low cost. But the automation isn’t seamless, you’ll spend time building and maintaining Zaps, and payment status won’t flow back without extra work. For a growing business, the Zoho or Xero-plus-Capsule stacks serve you better.
Quick Comparison: What Actually Syncs?
| Stack | Contacts | Invoices | Payment status | Quotes | Native | CRM tier needed | Confirmed cost |
|---|---|---|---|---|---|---|---|
| Xero + Capsule | Yes | Yes | Yes | No | Yes | Capsule Starter £14 | £44/month, 2 users |
| QuickBooks + Capsule | Yes | Yes | Yes | No | Yes | Capsule Starter £14 | £44/month, 2 users |
| Zoho Books + Zoho CRM | Yes | Yes | Yes | Yes | Yes | Zoho CRM Standard £12 | £24/month CRM, plus Books |
| FreeAgent + HubSpot | Yes | Partial | No | No | No — Zapier | HubSpot Free, 2 users | £0 plus Zapier |
FAQ
Which Capsule plan do I need for the Xero or QuickBooks integration?
Starter, at £14 per user per month billed annually. Premium integrations sit on Capsule’s entry paid tier, not a higher one — you’ll see “Professional” quoted elsewhere, but Capsule’s four plans are Free, Starter, Growth and Advanced. The free plan doesn’t include the integration.
What does a CRM plus accounting stack actually cost?
For two users: Xero Ignite plus Capsule Starter is £44 a month, and QuickBooks Simple Start plus Capsule Starter is also £44. Zoho CRM Standard for two users is £24 plus Zoho Books. A sole trader with a qualifying bank account can run FreeAgent and HubSpot free, plus Zapier.
Does my accounting software need a specific plan to integrate?
Usually the constraint is on the CRM side rather than the accounting side. Capsule needs Starter; Zoho CRM needs Standard; HubSpot’s free tier works but only via Zapier. Xero and QuickBooks both support the integration across their ranges. Always check both products’ integration pages and confirm the tier before buying.
Is “integrates with” in vendor marketing always meaningful?
No. It can mean anything from full bidirectional invoice and payment sync down to a contact export you could replicate with a spreadsheet. Ask: does it sync invoices? Does payment status update in the CRM? Is it live or trigger-based? If the vendor’s page doesn’t answer those clearly, treat the claim sceptically until you’ve verified it on a trial.
Are all of these compatible with Making Tax Digital?
Xero, QuickBooks Online, Zoho Books and FreeAgent are all MTD for VAT compliant with direct HMRC submission. MTD for Income Tax Self Assessment began phasing in from April 2026 for sole traders and landlords with qualifying income above £50,000, with the threshold dropping to £30,000 in April 2027. Check each provider’s current MTD position as the rollout continues.
Can I use a free CRM with paid accounting software?
Yes, and it’s reasonable. HubSpot’s free CRM is the most capable free option, though it caps at two users. The limitation is that you won’t get native deep integration — you’re connecting through Zapier. Workable when starting out; plan to graduate to a native pairing as the rekeying overhead outgrows the subscription.
Conclusion: Which Stack Should You Choose?
For most UK small businesses, Xero paired with Capsule CRM is the safest recommendation — invoice and payment visibility inside the CRM is meaningful, both products are well supported by UK accountants, and at £44 a month for two users it’s better value than the £52 figure that circulates. Crucially, the integration is on Capsule’s £14 Starter tier, not a higher plan.
QuickBooks plus Capsule comes to exactly the same £44, so pick your accounting software on its own merits rather than on integration cost.
If you want the deepest integration — including quote-to-invoice automation — Zoho Books with Zoho CRM delivers more. At £12 a user, Zoho CRM is the cheapest CRM here, and quotes flowing straight into invoices is something none of the other stacks offer.
If you’re a sole trader with a NatWest, RBS, Ulster Bank or Mettle account, FreeAgent plus HubSpot free is worth exploring — just be realistic that Zapier isn’t a native integration and payment status won’t flow back without extra work.
Whatever you choose, verify on a free trial before committing. Connect the two systems, raise a test invoice, mark it paid, and check whether the status appears in your CRM. If it does, you’ve found a real integration.
Pricing and features correct at time of writing. Plans and capabilities are subject to change — always confirm current details on the provider’s website before purchasing.