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Head-to-head · Corporate Tax Software

Tax Series vs Complete Tax Solutions

  • Updated Oct 2026
  • Both researched from official sources
  • 5 checks side by side
Higher score Tax Series #1 in Corporate Tax Software 9.4/10 Pricing on request ✓ 0 of 5 features Visit Tax Series
Complete Tax Solutions #5 in Corporate Tax Software 9.0/10 Pricing on request ✓ 5 of 5 features Contact CTS

Tax Series leads on 0 checks, Complete Tax Solutions 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 featuresComplete Tax Solutions · 5 of 5

Tax Series scores higher on our rubric for corporate tax software: 9.4 against 9.0 out of 10; our editors rank them #1 and #5.

Tax Series is the better fit for multinational U.S. corporate tax teams. Complete Tax Solutions is the better fit for australian groups needing tax provision.

  • Tax Series fits best

    Multinational U.S. corporate tax teams

  • Complete Tax Solutions fits best

    Australian groups needing tax provision

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.

Side by side

Feature Tax Series 9.4/10 Visit ↗ Complete Tax Solutions 9.0/10 Visit ↗
At a glance
Editor score 9.4 9.0
Ranking #1 in Corporate Tax Software #5 in Corporate Tax Software
Best for Multinational U.S. corporate tax teams Australian groups needing tax provision
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, Desktop
Platforms Web Web
Support Email, Phone Email, Phone, Docs
Integrations 4 integrations 2 integrations
Built for Mid-market, Enterprise Small business, Mid-market, Enterprise
Features Tax Series 0/5 · Complete Tax Solutions 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
Pros
  • 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
  • Supports corporate and consolidated tax return preparation
  • Calculates current and deferred tax balances with journals and disclosures
  • Combines Excel workpapers with ATO SBR electronic lodgement
Cons
  • 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
  • Pricing requires contacting the CTS team
  • The portfolio contains multiple products rather than one plan-based application
  • Its e-lodgement workflow is centered on Australia's ATO SBR portal
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 →

Complete Tax Solutions (CTS) is a suite of tax compliance and reporting products from SW Accountants & Advisors. Its corporate offering is designed for private, large and listed groups, with coverage for corporate and consolidated returns,…

Read the review →
  1. Tax SeriesCorporate Tax Software 9.4Pricing on request
  2. Complete Tax SolutionsCorporate Tax Software 9.0Pricing on request

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

  • Complete Tax Solutions — where it wins

    • Supports corporate and consolidated tax return preparation
    • Calculates current and deferred tax balances with journals and disclosures
    • Combines Excel workpapers with ATO SBR electronic lodgement

    Where it doesn't

    • Pricing requires contacting the CTS team
    • The portfolio contains multiple products rather than one plan-based application
    • Its e-lodgement workflow is centered on Australia's ATO SBR portal
  • Tax Series9.4/10 · Pricing on request

    A broad compliance and provision platform for multinational U.S. tax teams.

    Visit Tax SeriesFull verdict →
  • Complete Tax Solutions9.0/10 · Pricing on request

    A broad Australian tax compliance suite with strong provision and group-reporting coverage.

    Contact CTSFull verdict →

More comparisons

All corporate tax software comparisons → · Full ranking →

Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Last updated · How we research and update