Tax Series

Tax Series is a corporate income-tax system for tax departments coordinating work across entities and jurisdictions. It is best suited to medium and large multinational companies that need connected provision, compliance, and reporting workflows. Its shared database and full-cycle proof of concept are strong reasons to evaluate it; custom pricing and a multi-week evaluation make it less suited to buyers seeking a quick, low-cost filing tool.

Overview

Tax Series brings multiple corporate tax processes into one web-native system, reusing data across collection, compliance, provision, planning, audit support, legal entity maintenance, tax calendars, and document management. That breadth can help teams coordinate related work without repeatedly handling the same information. It is a more substantial fit for corporate tax operations than for a small business with occasional filing needs.

Tax Technologies has provided corporate tax solutions since 2000 and says it has had no ownership changes. Its Proof of Concept allows prospective clients to use the product for a full tax cycle at no cost. The process typically takes 2–10 weeks, depending largely on data availability and reconciliation needs: a useful chance to assess fit before licensing, but one that requires time and prepared data.

Key features

Provision, compliance, and BEPS

The Provision module supports worldwide tax provision reporting under ASC 740 and calculations under U.S. GAAP or IFRS. That combination addresses groups working across accounting frameworks, while the worldwide scope makes the module more relevant to complex corporate tax departments than to single-entity filers. Compliance automates corporate tax calculations and populates forms including Forms 5471, 8865, and 8858, reducing repetitive form work for teams handling these filings.

The BEPS module automates Country-by-Country reports, master and local files, and multi-jurisdictional reporting. For multinational groups with those reporting obligations, it keeps related work within the same system; businesses without cross-border reporting needs are unlikely to benefit from that breadth.

Collection, integrations, and controls

Data Collector assigns packages to preparers, reviewers, and approvers and provides real-time project monitoring. This gives tax teams a way to organize responsibility and track progress across a tax cycle rather than relying solely on disconnected handoffs. Tax Series Web Services supports bidirectional data transfer with client systems, validates data, and can trigger calculations, which is useful when the tax workflow must connect to existing systems.

The vendor says it annually obtains third-party SOC 1 and SOC 2 reports and has an in-house security team. Each client is assigned a dedicated support representative, with free support hours based on licensed products. After a subscription expires or is terminated, clients receive three months of read-only access at no cost to retrieve data, a practical retrieval window but not ongoing operational access.

Pricing

Tax Series: custom pricing, with a fixed licensing fee based on scope determined during the proof of concept. There are no published seat or usage caps to compare. The no-cost Proof of Concept covers a full tax cycle and typically takes 2–10 weeks, so it suits buyers willing to invest time in a substantive evaluation before negotiating a license. The scope-based fee may fit varied corporate requirements, but buyers looking for an upfront price or a simple entry-level plan should look elsewhere.

Platforms

Tax Series runs on the web and offers an API. The web-native product suits browser-based corporate tax operations, while the API supports data exchange and calculation triggers through Tax Series Web Services. It is not positioned as a desktop or mobile app.

Who it's for

Tax Series is aimed at U.S. corporate taxpayers and multinational corporations, especially medium and large groups managing multiple connected tax processes. Federal and state e-file, bookkeeping imports, and prior-year imports support common corporate tax workflows. Its strongest case is for teams that can use the shared data foundation across provision, compliance, and cross-border reporting; smaller businesses needing only straightforward returns are unlikely to need this scope.

Pros and cons

Pros: A single database supports data reuse across collection, compliance, provision, planning, audit support, entity maintenance, calendars, and document management, reducing the need to treat each process as a separate data silo.

Pros: A no-cost full-cycle proof of concept lets prospective clients assess the system before licensing rather than deciding from a short trial alone.

Pros: Dedicated support representatives, product-based free support hours, and three months of read-only retrieval access provide concrete support and transition provisions.

Cons: Custom, scope-based pricing requires a proof-of-concept process before buyers can establish the license cost.

Cons: A proof of concept that typically takes 2–10 weeks is a meaningful commitment for teams that need to select software quickly.

Cons: The corporate and multinational focus makes the product a poor match for small businesses seeking a narrowly scoped filing tool.

Alternatives

Tax Provision Software, Corporate Tax Software, Tax Compliance Software, and Small Business Tax Software are useful category starting points if you want to compare products by the work they support.

Flowie is a freemium alternative with a free plan at free, billed forever, for up to 24 documents per month (300 per year), with basic processing, no workflows, all document types, and one entity; choose it if that limited document-processing scope is a better fit than corporate tax operations.

OneStream is a paid platform with pricing discussed through a demo. CSC Corptax is enterprise corporate tax software with pricing through a requested demo. Consider either when comparing paid corporate tax platforms.

Kleos is a paid alternative with Android and iOS support; its Core plan is billed 49 EUR /Mes por usuario and Advanced is billed 65 EUR /Mes por usuario. CCH Integrator Indirect Tax, Lucasys Tax Provision, ONESOURCE Certificate Manager, and PowerPlan Tax Provision are other paid alternatives.

Verdict

Choose Tax Series if you are a medium or large corporate tax team that can put its shared data system to work across provision, compliance, and multinational reporting. The full-cycle proof of concept is its clearest buying advantage, while the scope-based custom fee and weeks-long evaluation are the main reasons to look elsewhere if you need a fast decision or a simpler tax product.