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Accounting · head to head

Avalara vs IRIS KashFlow

Avalara logo

Avalara

Accounting

Tax compliance done right

From
$29/month
Rated
-
Full reviewWebsite
IRIS KashFlow logo

IRIS KashFlow

Accounting

Online accounting software for UK sole traders and small businesses

From
£13.5/month
Rated
-
Full reviewWebsite

The short version

  • Each has a real cost: Avalara pricing varies significantly based on products, integrations, transaction volume, and jurisdictions; 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
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where Avalara and IRIS KashFlow differ
AttributeAvalaraIRIS KashFlow
Starting price$29/month£13.5/month
PlatformsWeb, ApiWeb
Founded2004Unknown

Identical on both: pricing model (subscription), 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 Avalara

  • Tax calculation
  • Returns filing
  • Exemption management
  • Document management
  • Real-time rates
  • QuickBooks
  • NetSuite
  • Shopify

Only in IRIS KashFlow

Nothing recorded that Avalara does not also cover.

What people use each for

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

Avalara

  • Real-time sales tax calculation at checkoutnot IRIS KashFlow
  • Multi-state and multi-jurisdiction tax determinationnot IRIS KashFlow
  • VAT, lodging, communications and excise tax calculationnot IRIS KashFlow
  • Feeding tax results into an ERP or ecommerce platform through the APInot IRIS KashFlow

IRIS KashFlow

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

Where each one falls short

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

Avalara

  • Pricing varies significantly based on products, integrations, transaction volume, and jurisdictions
  • No free tier or trial period published
  • Enterprise sales model requires contacting sales specialists for customized quotes

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

Pricing, plan by plan

Avalara

$29/month
  • AvaTax$50/month
    • Tax calculation
    • Exemption certificates
    • Returns filing

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

Which should you pick?

Choose Avalara if

  • You need tax calculation.
  • You work on Web, Api.
  • You also want returns filing.
Avalara review

Choose IRIS KashFlow if

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

IRIS KashFlow review

Questions people ask

Is Avalara or IRIS KashFlow better?
Neither clearly leads. Avalara starts at $29/month and IRIS KashFlow at £13.5/month, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, Avalara or IRIS KashFlow?
Avalara starts at $29/month and IRIS KashFlow at £13.5/month.
Does Avalara or IRIS KashFlow run on more platforms?
Avalara runs on Web, Api. IRIS KashFlow runs on Web.
What is Avalara best used for?
Avalara is most often used for real-time sales tax calculation at checkout, multi-state and multi-jurisdiction tax determination, vat, lodging, communications and excise tax calculation, feeding tax results into an erp or ecommerce platform through the api. Of those, real-time sales tax calculation at checkout and multi-state and multi-jurisdiction tax determination are not what IRIS KashFlow is typically brought in for.
What can Avalara do that IRIS KashFlow cannot?
Avalara covers Tax calculation, Returns filing, Exemption management, Document management.

Answered from the vendors’ own pages

Avalara: What are the starting prices for Avalara services?

Avalara Tax Calculation and Returns Compliance Package starts at $699. License Guidance is available for as low as $119. Sales Tax Registration costs $403 per location.

Source
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
Avalara: How does Avalara's pricing scale?

Avalara uses volume-based pricing that varies based on the number of integrated business applications, volume of monthly sales transactions, number of states or jurisdictions for tax collection, and Streamlined Sales Tax enrollment. Pricing scales with business growth and transaction volume.

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
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
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