Head-to-head · Corporate Tax Software
Tax Series vs Alphatax
Tax Series leads on 0 checks, Alphatax on 0, and 5 are even. Who comes out ahead on the 5 yes/no, price and count checks where we have data for both products. The editor score weighs everything else too.
Our verdict
- Highest scoreTax Series · 9.4/10
- Most featuresAlphatax · 5 of 5
Tax Series scores higher on our rubric for corporate tax software: 9.4 against 9.1 out of 10; our editors rank them #1 and #4.
Tax Series is the better fit for multinational U.S. corporate tax teams. Alphatax is the better fit for UK groups needing end-to-end tax workflows.
- Tax Series fits best
Multinational U.S. corporate tax teams
- Alphatax fits best
UK groups needing end-to-end tax workflows
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Side by side
| Feature | Tax Series 9.4/10 Visit ↗ | Alphatax 9.1/10 Visit ↗ |
|---|---|---|
| At a glance | ||
| Editor score | 9.4 | 9.1 |
| Ranking | #1 in Corporate Tax Software | #4 in Corporate Tax Software |
| Best for | Multinational U.S. corporate tax teams | UK groups needing end-to-end tax workflows |
| Pricing model | Paid | Paid |
| Starting price | Pricing on request | Pricing on request |
| Free plan | Not checked yet | Not checked yet |
| Free trial | — | — |
| Deployment | Cloud | Cloud, Self-hosted |
| Support | Email, Phone | Email, Phone, Tickets |
| Compliance | SOC 2 | ISO 27001 |
| Integrations | 4 integrations | 2 integrations |
| Built for | Mid-market, Enterprise | Mid-market, Enterprise |
| Features Tax Series 0/5 · Alphatax 5/5 | ||
| Electronic filing | Not checked yet | ✓ (best) |
| Consolidated returns | Not checked yet | ✓ (best) |
| Tax provision support | Not checked yet | ✓ (best) |
| Accounting integrations | Not checked yet | ✓ (best) |
| Approval workflows | Not checked yet | ✓ (best) |
| Specs | ||
| Jurisdictions covered | Not checked yet | Not checked yet |
| Deployment | Not checked yet | Hybrid |
| Our review | ||
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| Our verdict | Tax Series is a web-based corporate income tax platform from Tax Technologies, Inc. for medium-sized and large multinational companies. It brings U.S. federal corporate tax compliance, state return preparation, multi-jurisdiction… Read the review → |
Alphatax is corporate tax compliance software for companies, tax advisers and enterprise tax teams. It brings together corporation tax calculations, compliance reporting, electronic filing and XBRL tagging, with workflows for divisional… Read the review → |
Strengths and trade-offs
Tax Series — where it wins
- Covers U.S. federal, state, and international compliance
- Combines provision, BEPS reporting, workflows, and entity management
- Imports general-ledger and financial-system data through web and API access
Where it doesn't
- Designed for medium-sized and large multinational companies
- Licensing requires a contact-sales process
- Its broad scope may exceed the needs of smaller domestic tax teams
Alphatax — where it wins
- Corporate calculations, compliance, e-filing and XBRL in one workflow
- ERP imports, divisional and group consolidation support
- Audit trails, diagnostics and review controls for multi-entity teams
Where it doesn't
- Buyers need a sales-led quote and order form
- Filing capabilities vary across jurisdictions
- Its broad scope may exceed the needs of small standalone filers
- Tax Series9.4/10 · Pricing on request
A broad compliance and provision platform for multinational U.S. tax teams.
Visit Tax SeriesFull verdict → - Alphatax9.1/10 · Pricing on request
A broad corporate tax system for UK groups with complex compliance workflows.
Visit AlphataxFull verdict →
More comparisons
- Tax Series vs ONESOURCE Income Tax
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- Tax Series vs Complete Tax Solutions
- Tax Series vs CSC Corptax
- Tax Series vs ONESOURCE Tax Provision
- Tax Series vs IRIS Business Tax
- ONESOURCE Income Tax vs Alphatax
- GoSystem Tax RS vs Alphatax
All corporate tax software comparisons → · Full ranking →
Reviewed by iTechGuides Editors · Editorial team · Updated Nov 2026
Last updated · How we research and update