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Accounting · head to head

Fortnox vs IRIS KashFlow

Fortnox logo

Fortnox

Accounting

Swedish cloud accounting and business platform for bookkeeping, invoicing and payroll

From
Free
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

  • Only Fortnox has a free tier, so it costs nothing to try first.
  • Each has a real cost: Fortnox corporate packages alone span at least 7 named tiers (Mini through Stor+) priced from 209 kr/man to 919 kr/man, and add-on programs are billed separately per module (SEK); 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 29 August 2026.

Where they differ

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

Attributes where Fortnox and IRIS KashFlow differ
AttributeFortnoxIRIS KashFlow
Starting priceFree£13.5/month
Free tierYesNo

Identical on both: pricing model (subscription), platforms (Web), user rating (Not yet rated), category (Accounting).

What people use each for

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

Fortnox

  • Registering Swedish corporations with guided formation assistancenot IRIS KashFlow
  • Selling unpaid invoices to improve cash flownot IRIS KashFlow
  • Managing multiple client businesses from bureau dashboardnot IRIS KashFlow
  • Integrating payroll with Swedish banking automationnot IRIS KashFlow

IRIS KashFlow

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

Where each one falls short

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

Fortnox

  • Corporate packages alone span at least 7 named tiers (Mini through Stor+) priced from 209 kr/man to 919 kr/man, and add-on programs are billed separately per module (SEK)
  • The Fortnox Access verification tier is priced by transaction volume, rising from 9 kr/man at zero verifications to 199 kr/man at 1000+ verifications (SEK), so cost is not fixed and scales with usage

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

Fortnox

Free
  • New Company TrialFree
    • 6-month free trial for newly started businesses

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 Fortnox if

  • You want to start without paying.
Fortnox review

Choose IRIS KashFlow if

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

IRIS KashFlow review

Questions people ask

Is Fortnox or IRIS KashFlow better?
Neither clearly leads. Fortnox starts at Free 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, Fortnox or IRIS KashFlow?
Fortnox has a free tier; the other does not. Paid plans start at Free for Fortnox and £13.5/month for IRIS KashFlow.
Does Fortnox or IRIS KashFlow run on more platforms?
Both run on Web, so platform support will not decide this one for you.
Can I use Fortnox for free?
Yes. Fortnox has a free tier, so you can try it without paying. IRIS KashFlow starts at £13.5/month.
What is Fortnox best used for?
Fortnox is most often used for registering swedish corporations with guided formation assistance, selling unpaid invoices to improve cash flow, managing multiple client businesses from bureau dashboard, integrating payroll with swedish banking automation. Of those, registering swedish corporations with guided formation assistance and selling unpaid invoices to improve cash flow are not what IRIS KashFlow is typically brought in for.

Answered from the vendors’ own pages

Fortnox: Does Fortnox offer a free trial?

Yes, newly started businesses receive their first six months in Fortnox at no cost, followed by subscription-based pricing.

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
Fortnox: What pricing tiers does Fortnox offer?

Fortnox offers tiered subscription packages that vary by module (accounting, invoicing, payroll) but specific pricing details are not listed on the main website.

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
Fortnox: How can I find Fortnox pricing information?

Detailed pricing is available on the packages page (/paket), through a purchasing guide tool at buy-guide.fortnox.se, or by contacting sales representatives directly.

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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