Is BrightTax Worth the Switch? Honest Feature, Value, and Support Comparison Against TaxCalc, Taxfiler, and IRIS

Key takeaway: Choosing or switching tax software is one of the highest-friction decisions in a practice’s technology stack. The core compliance outputs — SA100, CT600, partnership returns, iXBRL submission — are broadly equivalent across the major products at the mid-market level. The differences that matter are pricing relative to practice size, MTD ITSA readiness, quality of integration with the rest of the practice’s software, and the day-to-day workflow experience. For practices already using BrightPay for payroll or considering BrightAccountsProduction for accounts, BrightTax offers integration value that TaxCalc, Taxfiler, and IRIS cannot replicate. For practices not in the Bright ecosystem, the comparison is closer and depends on current pain points.

Switching tax software is not a decision practices make lightly. The migration of prior-year data, the re-training of staff, and the operational disruption during the first filing season on a new platform are real costs. So when is switching tax software worth it — and does BrightTax make the case?

This post offers an honest comparison of BrightTax against the three most commonly cited alternatives: TaxCalc, Taxfiler, and IRIS Personal and Business Tax. We cover compliance capability, value, MTD ITSA readiness, integration, and the scenarios where each product is the better choice.

The Products: A Brief Overview

TaxCalc — founded in 2001, widely used from sole practitioners to mid-size firms. Available as desktop (with cloud sync) and fully cloud versions. Known for strong customer support, clear pricing, and a consistent user interface. Covers SA100, CT600, SA800, trusts, LLPs, and practice management tools. Actively developed for MTD ITSA.

IRIS Personal and Business Tax — part of the IRIS practice management suite, the dominant product in medium-to-large UK practices. Deep integration with IRIS Accounts Production, IRIS Practice Management, and IRIS KashFlow. Comprehensive coverage including CT600, SA100, partnership, trusts. Enterprise pricing model; cost-effective only when used as part of the wider IRIS suite.

BrightTax— cloud-native, part of the Bright Software Group suite alongside BrightPay (payroll), BrightBooks (bookkeeping), BrightAccountsProduction, and BrightManager. Covers SA100, CT600, SA800, MTD ITSA. HMRC-recognised. Priced for practices from sole practitioners through growing firms.

Compliance Capability: What Each Product Covers

For the core compliance outputs — SA100 self assessment, CT600 corporation tax, SA800 partnership, electronic filing to HMRC — all four products deliver. At the mid-market level, the fundamental compliance capability is not where practices should expect to find major differences.

Where differences emerge:

SA100 supplementary page coverage. All four products cover the major SA supplementary pages: SA103 (self-employment), SA105 (UK property), SA108 (capital gains), SA102 (employment), SA104 (partnership share). IRIS has historically been strongest on complex trust and estate returns; for practices with significant trust portfolios, IRIS Personal Tax’s depth in this area is a genuine differentiator.

CT600 complexity. All four products handle the standard CT600 computation including capital allowances, loss relief, and group relief. For R&D claims, all four support the merged RDEC (from April 2024 onwards). For very complex group structures with multiple connected companies, Alphatax (Thomson Reuters) or CCH remain the specialist tools — but BrightTax, TaxCalc, IRIS, and Taxfiler all handle the typical SME and owner-managed company CT600 adequately.

MTD ITSA. This is the most significant current differentiator. As of mid-2026, BrightTax, TaxCalc, and Xero are among the products confirmed as live on HMRC’s MTD ITSA API for Phase 1 quarterly update submissions. Taxfiler/Sodium has been developing its MTD ITSA capability; practices should verify current live status with Sodium directly. IRIS has MTD ITSA capability in development. For practices with significant Phase 1 client portfolios (clients above £50,000 qualifying income), confirming live MTD ITSA submission capability before choosing or staying with software is essential.

Value: How the Pricing Models Compare

This is where the products diverge most clearly.

TaxCalc — per-user pricing with add-on modules for each return type. Transparent pricing, typically competitive for small to mid-size practices. The total cost depends on which modules are activated (SA, CT, SA800, trusts) and the number of users.

Taxfiler/Sodium — per-return or subscription pricing. Historically one of the most accessible price points in the market for small practices. As it has matured and been acquired, pricing has evolved; practices should get a current quote.

IRIS — suite-based pricing. IRIS is most cost-effective when a practice uses the full IRIS suite (practice management, accounts production, tax, payroll). For practices using IRIS only for tax (with non-IRIS accounts production and payroll), the cost-per-return is typically higher than alternatives. The integration benefit within the IRIS suite is real, but only valuable for practices committed to the full suite.

BrightTax — subscription pricing, accessible for practices from sole practitioners upwards. For practices already using BrightPay or BrightAccountsProduction, BrightTax is purchased as part of the Bright Suite, with integration value built in. For practices not currently in the Bright ecosystem, BrightTax as a standalone tax product is competitively priced against TaxCalc and Taxfiler at the small-to-mid-market level.

Integration: The Differentiator That Matters Most

For most practices, the strongest reason to choose one tax product over another — assuming comparable compliance capability and reasonable pricing — is integration with the rest of the practice’s software.

BrightTax integration with BrightPay. Where a practice uses BrightPay to process payroll for its clients, employment income from PAYE flows from BrightPay into the BrightTax SA100 return for each employed client — eliminating manual re-entry of P60 figures. For a practice managing 50 director-shareholder clients on BrightPay, this is a meaningful time saving per return across the self assessment season.

BrightTax integration with BrightAccountsProduction. Where a practice uses BrightAccountsProduction, corporation tax figures (profit before tax, capital allowances schedules) flow from BrightAccountsProduction into BrightTax for the CT600 computation — and the iXBRL-tagged accounts produced in BrightAccountsProduction are attached to the CT600 filing automatically. For practices with significant company client portfolios, this removes one of the most error-prone manual steps in the accounts-to-tax workflow.

IRIS integration within the IRIS suite. IRIS’s integration with IRIS Accounts Production and IRIS Practice Management is genuinely strong — but it requires commitment to the full IRIS stack. Practices using TaxCalc or BrightTax with non-IRIS accounts production do not have access to this integration.

TaxCalc and Taxfiler integration. Both products have APIs and import/export capabilities, but neither offers the same depth of native integration with payroll or accounts production that BrightTax has within the Bright Suite.

Scenarios: When to Choose Which Product

Choose BrightTax if: you use BrightPay for payroll (the SA100 data connection delivers immediate return), you are considering BrightAccountsProduction (the accounts-to-CT600 workflow is the strongest integration argument), or you want a cloud-native MTD ITSA-ready platform at a price point that scales from sole practitioner to growing firm.

Choose TaxCalc if: you are not in the Bright or IRIS ecosystem, want a product with a strong track record and clear pricing, and value consistent support and user experience. TaxCalc is a safe, well-supported choice across practice sizes.

Choose Taxfiler/Sodium if: you are a small practice looking for the most accessible price point and a simple cloud interface, and your return types are primarily SA100 and CT600 without complex trust or partnership requirements. Confirm MTD ITSA status before committing.

Choose IRIS if: you have 20+ staff and are committed to the full IRIS suite — accounts production, practice management, and tax. The integration benefit within IRIS is genuine, but the cost is justified only when the full suite is in use.

Frequently Asked Questions

This content may have been developed with the assistance of AI tools. Content is reviewed by a member of the Bright team before publication. Guidance on legislation can be obtained from your industry body.