Best Tax Series Alternatives in 2026
The top Tax Series alternatives are ONESOURCE Income Tax, GoSystem Tax RS and Alphatax: 15 corporate tax software our editors would look at instead of Tax Series, in our ranking order.
Tax Series: A broad compliance and provision platform for multinational U.S. tax teams. Where it falls short: designed for medium-sized and large multinational companies.
Switching from Tax Series? For most corporate tax software buyers the best Tax Series alternative is ONESOURCE Income Tax, built for large enterprises needing global compliance. Sage Corporation Tax has a free plan. TaxCycle T2 offers the most jurisdictions covered (3).
Why People Look for a Tax Series Alternative
- 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
Quick Picks by What You Need
- Best overallONESOURCE Income Tax9.3
Large enterprises needing global compliance
Visit ONESOURCE Income Tax - Best free optionSage Corporation Tax8.0
Has a free plan
Visit Sage Corporation Tax - Most jurisdictions coveredTaxCycle T28.2
3
Visit TaxCycle T2
All 15 Tax Series Alternatives, Ranked
Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.
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Best forLarge enterprises needing global compliance
A broad corporate tax system for complex federal, state, local, and international compliance.
- Tax provision support
- Accounting integrations
- Electronic filing
9.3/10★★★★★Visit site -
Best forFirms handling complex consolidated returns
A cloud platform for firms managing complex, high-volume corporate filings.
- Consolidated returns
- Accounting integrations
- Electronic filing
9.2/10★★★★★Try GoSystem Tax RS -
Best forUK groups needing end-to-end tax workflows
A broad corporate tax system for UK groups with complex compliance workflows.
- Tax provision support
- Approval workflows
- Consolidated returns
9.1/10★★★★★Visit Alphatax -
Best forAustralian groups needing tax provision
A broad Australian tax compliance suite with strong provision and group-reporting coverage.
- Tax provision support
- Approval workflows
- Consolidated returns
9.0/10★★★★☆Contact CTS -
Best forEnterprise tax-provision and compliance teams
Deep provision and compliance coverage for multinational tax departments.
8.9/10★★★★☆Visit CSC Corptax -
Best forASC 740 and IAS 12 provision teams
A focused choice for ASC 740 and IAS 12 provision workflows.
8.8/10★★★★☆Visit ONESOURCE -
Best forUK practices using IRIS systems
A broad UK tax workflow for practices already working in the IRIS ecosystem.
- Approval workflows
- Accounting integrations
- Electronic filing
8.7/10★★★★☆Visit IRIS -
Best forU.S. firms filing many entity types
Broad entity and jurisdiction coverage for Windows-based accounting firms with complex filing needs.
8.6/10★★★★☆Visit Wolters Kluwer -
Best forTax firms needing broad U.S. return support
Broad U.S. return coverage with multistate tools, diagnostics, e-filing, and practice integrations.
8.5/10★★★★☆Visit UltraTax CS -
Best forCanadian firms wanting connected T2 workflows
A focused Windows tool for connected Canadian corporate return workflows.
- Consolidated returns
- Accounting integrations
- Electronic filing
8.4/10★★★★☆Visit ProFile T2 -
Best forCanadian practices needing deep T2 diagnostics
A deep desktop toolkit for Canadian T2 preparation, diagnostics and electronic filing.
- Electronic filing
8.3/10★★★★☆Visit site -
Best forCanadian firms needing broad connected filing
A broad Canadian corporate tax module with connected imports, filing, and workflow tools.
- Accounting integrations
- Electronic filing
8.2/10★★★★☆Visit TaxCycle T2 -
Best forCanadian firms prioritizing efficient T2 entry
A Windows-based Canadian corporate tax tool with broad return coverage and integrated filing.
- Approval workflows
- Accounting integrations
- Electronic filing
8.1/10★★★★☆Visit DT Max T2 -
Best forBudget-conscious UK tax practices
A free browser-based option for UK practices preparing and filing CT600 returns.
- Accounting integrations
- Electronic filing
8.0/10★★★★☆Visit Sage -
Best forSmall UK practices needing affordable CT600 filing
An affordable CT600 filing tool for small UK practices, with limited wider tax functionality.
- Consolidated returns
- Electronic filing
7.9/10★★★★☆Visit Andica
Tax Series Alternatives: Common Questions
What is the best alternative to Tax Series?
ONESOURCE Income Tax: #2 in our Corporate Tax Software ranking, with an editor score of 9.3 out of 10. A broad corporate tax system for complex federal, state, local, and international compliance.
Is there a free alternative to Tax Series?
Yes. Sage Corporation Tax has a free plan or a free tier.
Why do people look for Tax Series alternatives?
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.
Which Tax Series alternative has the most jurisdictions covered?
TaxCycle T2, with 3.
How do I switch from Tax Series?
Export your data from Tax Series (most tools have an export in their settings). Sign up for the alternative; start on its free plan or trial if it has one. Import your export and set up the integrations your team relies on. Run both side by side for a short while, then cancel Tax Series.
How to Switch from Tax Series
- Export your data from Tax Series (most tools have an export in their settings).
- Sign up for the alternative; start on its free plan or trial if it has one.
- Import your export and set up the integrations your team relies on.
- Run both side by side for a short while, then cancel Tax Series.
Tax Series vs Each Alternative
| # | Tool | Paid from | Electronic filing | Score |
|---|---|---|---|---|
| 1 | Tax Series | 9.4 | ||
| 1 | ONESOURCE Income Tax | Yes | 9.3 | |
| 2 | GoSystem Tax RS | Yes | 9.2 | |
| 3 | Alphatax | Yes | 9.1 | |
| 4 | Complete Tax Solutions | Yes | 9.0 | |
| 5 | CSC Corptax | 8.9 | ||
| 6 | ONESOURCE Tax Provision | 8.8 | ||
| 7 | IRIS Business Tax | Yes | 8.7 | |
| 8 | CCH ProSystem fx Tax | 8.6 | ||
| 9 | UltraTax CS | 8.5 | ||
| 10 | ProFile T2 | Yes | 8.4 | |
| 11 | Corporate Taxprep | Yes | 8.3 | |
| 12 | TaxCycle T2 | Yes | 8.2 | |
| 13 | DT Max T2 | Yes | 8.1 | |
| 14 | Sage Corporation Tax | Free | Yes | 8.0 |
| 15 | Andica CT600 Corporation Tax Software | £70/yr | Yes | 7.9 |
Head-to-Head
- Tax Series vs ONESOURCE Income Tax
- Tax Series vs GoSystem Tax RS
- Tax Series vs Alphatax
- Tax Series vs Complete Tax Solutions
- Tax Series vs CSC Corptax
- Tax Series vs ONESOURCE Tax Provision
Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026
Last updated · How we research and update