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Accounting · head to head

IRIS KashFlow vs TaxJar

IRIS KashFlow logo

IRIS KashFlow

Accounting

Online accounting software for UK sole traders and small businesses

From
£13.5/month
Rated
-
Full reviewWebsite
TaxJar logo

TaxJar

Accounting

Sales tax, simplified

From
Free
Rated
-
Full reviewWebsite

The short version

  • Only TaxJar has a free tier, so it costs nothing to try first.
  • 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; TaxJar both published plans include only 200 orders per month, so higher volume costs more
  • Prices and features above were last checked on 30 August 2026.

Where they differ

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

Attributes where IRIS KashFlow and TaxJar differ
AttributeIRIS KashFlowTaxJar
Starting price£13.5/monthFree
Pricing modelsubscriptionusage-based
Free tierNoYes
PlatformsWebWeb, Api
FoundedUnknown2013

Identical on both: 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 TaxJar does not also cover.

Only in TaxJar

  • Tax calculation
  • AutoFile returns
  • Economic nexus tracking
  • Exemption certificates
  • Multi-channel support
  • Shopify
  • Amazon
  • WooCommerce

What people use each for

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

IRIS KashFlow

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

TaxJar

  • Calculating US sales tax at checkoutnot IRIS KashFlow
  • Reporting sales tax liability by state and jurisdictionnot IRIS KashFlow
  • Automatically filing state sales tax returnsnot 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

TaxJar

  • Both published plans include only 200 orders per month, so higher volume costs more
  • The Starter plan at $39 per month allows only 3 data import integrations
  • AutoFile state filings are metered: Starter includes 2 credits a year and each extra filing costs $50, Professional includes 4 and each extra costs $55
  • Real time tax calculation API access requires the Professional plan at $99 per month
  • Phone support, a Customer Success Manager and a dedicated onboarding specialist require the Professional plan
  • The developer sandbox requires the Professional plan
  • The 10% saving requires annual billing

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

TaxJar

Free
  • Starter$39/month
    • Up to 200 orders per month
    • 3 data integrations
    • API access included
  • Professional$99/month
    • Up to 200 orders per month
    • 10 total data integrations
    • 10,000 API calls per minute

Which should you pick?

Choose IRIS KashFlow if

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

IRIS KashFlow review

Choose TaxJar if

  • You need tax calculation.
  • You want to start without paying.
  • You work on Web, Api.
  • You also want autofile returns.
TaxJar review

Questions people ask

Is IRIS KashFlow or TaxJar better?
Neither clearly leads. IRIS KashFlow starts at £13.5/month and TaxJar at Free, and user ratings are close enough to be indistinguishable. Choose on capability and platform support.
Which is cheaper, IRIS KashFlow or TaxJar?
TaxJar has a free tier; the other does not. Paid plans start at £13.5/month for IRIS KashFlow and Free for TaxJar.
Does IRIS KashFlow or TaxJar run on more platforms?
IRIS KashFlow runs on Web. TaxJar runs on Web, Api.
Can I use TaxJar for free?
Yes. TaxJar has a free tier, so you can try it without paying. IRIS KashFlow starts at £13.5/month.
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 TaxJar is typically brought in for.
What can IRIS KashFlow do that TaxJar cannot?
TaxJar covers Tax calculation, AutoFile returns, Economic nexus tracking, Exemption certificates.

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
TaxJar: How much does TaxJar cost?

TaxJar pricing starts at $39/month for Starter and $99/month for Professional. Save 10% or more with annual pricing. A 30-day free trial is available.

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
TaxJar: What is the difference between TaxJar Starter and Professional?

Both plans handle up to 200 orders/month, but Professional includes phone support, dedicated success manager, 10 users, and more data integrations and API capacity.

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
TaxJar: Does TaxJar offer discounts for annual billing?

Yes, TaxJar saves customers 10% or more when paying annually instead of monthly for both Starter and Professional plans.

Source
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