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Accounting · head to head

IRIS KashFlow vs Vertex

IRIS KashFlow logo

IRIS KashFlow

Accounting

Online accounting software for UK sole traders and small businesses

From
£13.5/month
Rated
-
Full reviewWebsite
Vertex logo

Vertex

Accounting

Enterprise tax determination, compliance, and e-invoicing software

From
On request
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: IRIS KashFlow advertised monthly prices of £1.35 (Starter) and £2.75 (Business) are a 90% promotional discount off the standard £13.50 and £27.50 rates, and the promotion is described as lasting 6 months before reverting; Vertex pricing is entirely custom and not published, requiring a sales engagement to get a quote.
  • Prices and features above were last checked on 29 August 2026.

Where they differ

Only the attributes on which IRIS KashFlow and Vertex actually diverge.

Attributes where IRIS KashFlow and Vertex differ
AttributeIRIS KashFlowVertex
Starting price£13.5/monthOn request
Pricing modelsubscriptionquote
PlatformsWebweb, api
FoundedUnknown1978

Identical on both: free tier (No), user rating (Not yet rated), category (Accounting).

What each one covers

Drawn from each product's published feature list. An absence here means we hold no record of it - not that the product lacks it.

Only in IRIS KashFlow

Nothing recorded that Vertex does not also cover.

Only in Vertex

  • Real-time tax determination
  • Global e-invoicing compliance
  • Compliance reporting and filing
  • Exemption certificate management
  • AI-powered compliance workflows
  • ERP integrations

What people use each for

The jobs each tool is most often brought in to do.

IRIS KashFlow

  • business accountingnot Vertex
  • invoicing and billingnot Vertex
  • VAT managementnot Vertex

Vertex

  • Automating indirect tax calculation for large multinational enterprisesnot IRIS KashFlow
  • Managing global e-invoicing compliance mandatesnot IRIS KashFlow
  • Handling exemption certificates for B2B salesnot IRIS KashFlow
  • Embedding tax logic directly into ERP and e-commerce checkout flowsnot IRIS KashFlow

Where each one falls short

Documented limitations, not opinions. Every one is a constraint you would hit in normal use.

IRIS KashFlow

  • Advertised monthly prices of £1.35 (Starter) and £2.75 (Business) are a 90% promotional discount off the standard £13.50 and £27.50 rates, and the promotion is described as lasting 6 months before reverting
  • Listed prices are in GBP plus VAT, and the platform's plans are built around UK VAT filing rather than other tax regimes
  • Annual pricing is quoted at RRP £162/year (Starter) and £291.50/year (Business) before the same promotional reduction

Vertex

  • Pricing is entirely custom and not published, requiring a sales engagement to get a quote.
  • The platform is built for enterprise-scale tax complexity, which can be more than small businesses need.
  • Implementation typically requires integration work with existing ERP systems, adding setup time and cost.
  • Documentation on self-serve plan tiers or limits is not publicly available, unlike simpler tax tools.

Pricing, plan by plan

IRIS KashFlow

£13.5/month
  • Starter Monthly$13.5/month
    • 10 invoices
    • up to 25 bank transactions
    • single user access
  • Business Monthly$27.5/month
    • unlimited invoices
    • unlimited bank transactions
    • multi-user access
  • Starter Annual$162/year
    • 10 invoices
    • up to 25 bank transactions
    • single user access
  • Business Annual$291.5/year
    • unlimited invoices
    • unlimited bank transactions
    • multi-user access

Vertex

On request
  • Vertex Cloud$undefined/mo
    • Custom pricing based on business needs
    • Tax determination, e-invoicing, and reporting
    • ERP and e-commerce integrations

Which should you pick?

Choose IRIS KashFlow if

Nothing in the data separates IRIS KashFlow from Vertex on the points above - pick on price and on how each one feels to use.

IRIS KashFlow review

Choose Vertex if

  • You need real-time tax determination.
  • You work on web, api.
  • You also want global e-invoicing compliance.
Vertex review

Questions people ask

Is IRIS KashFlow or Vertex better?
Neither clearly leads. IRIS KashFlow starts at £13.5/month and Vertex at On request, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, IRIS KashFlow or Vertex?
IRIS KashFlow starts at £13.5/month and Vertex at On request.
Does IRIS KashFlow or Vertex run on more platforms?
IRIS KashFlow runs on Web. Vertex runs on web, api.
What is IRIS KashFlow best used for?
IRIS KashFlow is most often used for business accounting, invoicing and billing, vat management. Of those, business accounting and invoicing and billing are not what Vertex is typically brought in for.
What can IRIS KashFlow do that Vertex cannot?
Vertex covers Real-time tax determination, Global e-invoicing compliance, Compliance reporting and filing, Exemption certificate management.

Answered from the vendors’ own pages

IRIS KashFlow: What are IRIS KashFlow's core features across all plans?

All IRIS KashFlow plans include unlimited quotes, online VAT submission, mobile app access, 50+ reports, bank feeds, receipt capture, multi-currency support, and payroll for up to 5 employees.

Source
Vertex: Is Vertex's tax software pricing publicly available?

No. Vertex does not publish pricing for its Vertex Cloud or enterprise tax platform; costs are determined through a custom quote based on modules, transaction volume, and deployment scope.

Source
IRIS KashFlow: Are there promotional discounts for new IRIS KashFlow customers?

Yes, new customers receive a 90% discount for 6 months on both Starter and Business monthly plans.

Source
Vertex: Roughly what do businesses pay for Vertex?

As reported by third-party buyer guides, not Vertex itself, mid-market companies processing 10,000-50,000 monthly transactions often pay in the $40,000-$100,000 per year range including platform and transaction fees.

Source
IRIS KashFlow: Can multiple users access IRIS KashFlow on the Starter plan?

No, the Starter plan is limited to single-user access only. Multi-user access requires the Business plan.

Source
Vertex: Who manages Vertex Cloud after it's set up?

With the Vertex Cloud deployment option, ongoing operations such as monitoring, configuration, and state tax correspondence remain the responsibility of the customer's internal team rather than Vertex.

Source
Vertex: What systems does Vertex integrate with?

Vertex integrates with major ERP and e-commerce platforms including SAP, Oracle, Microsoft, Shopify, Workday, and NetSuite to embed real-time indirect tax calculation into existing business systems.

Source
Vertex: How many jurisdictions does Vertex support for tax determination?

Vertex calculates real-time indirect tax rates across 195 countries and more than 20,000 tax jurisdictions worldwide.

Source
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