Large multinationals usually choose between ONESOURCE Tax Provision and CSC Corptax. ONESOURCE, from Thomson Reuters, is the most widely used and connects to its income tax compliance and Pillar Two tools. Corptax is preferred by tax departments that want provision and US federal and state compliance on one shared data model. Longview Tax, from insightsoftware, suits groups that think in consolidation and want provision, transfer pricing and Pillar Two close to the finance close. Bloomberg Tax Provision fits mid-size companies that want a cloud provision tool connected to Bloomberg Tax research and fixed assets. Workiva is the common choice for publishing the tax footnote and linking it to the 10-K. All of these are quote-based.
ONESOURCE is Thomson Reuters' tax technology suite, used by 21,000 businesses and more than 100,000 users. Its tax provision product handles current and deferred tax, return-to-provision, the rate reconciliation and interim calculations under ASC 740 and IAS 12, and shares data with ONESOURCE income tax compliance, Pillar Two and statutory reporting modules. That shared data is the main reason to choose it: trial balance mappings and adjustments flow from provision to the return. It has more than 200 integrations, including 12 for SAP. Expect a sizable implementation and a learning curve; G2 reviewers rate it 3.8 out of 5.
Pricing: Thomson Reuters does not publish ONESOURCE list pricing or an entry-level plan. Quotes vary by modules, jurisdictions, transaction volume, users, integrations, and implementation services. G2 lists no entry-level pricing for ONESOURCE.
Covers direct tax, indirect tax, reporting, and global trade in one product family.
Supports broad jurisdictional tax content and changing rates and rules.
Offers APIs plus certified connectors, including a substantial SAP integration portfolio.
Pricing is not public, so buyers must complete a sales and scoping process.
The suite’s breadth means deployments are module-specific and can require significant implementation work.
Its enterprise orientation is a poor fit for small businesses seeking simple self-service sales-tax filing.
Enterprise corporate tax software for U.S. and global compliance, provision, planning, analytics, and Pillar 2 reporting.
Corptax has focused only on corporate income tax for decades and is used by about 1,000 corporate clients in 100 countries, mostly large US-based groups. Provision, federal and state compliance, planning and analytics run on one database, so a change in a book-tax difference updates both the provision and the return workpapers. It supports US GAAP, IFRS and Pillar Two, and connects to Excel, Alteryx and Power BI for teams that build their own analytics. Pricing is quoted.
Pricing: CSC does not publish Corptax subscription prices, package prices, or a public free plan. Capterra lists the starting price as not provided by the vendor, and G2 lists no entry-level pricing. Enterprise implementation and configuration should be scoped with the subscription.
Covers compliance, provision, planning, analytics, and Pillar 2 in one system.
Supports U.S. federal, state, and local work alongside international and global tax workflows.
Offers connections to Excel, Alteryx, Power BI, Power Automate, and custom systems.
Pricing is not public and requires a sales-led enterprise evaluation.
Implementation can be costly and may require specialist consulting support.
Reviewers describe a learning curve and occasional navigation difficulty.
Longview Tax, owned by insightsoftware since 2020, approaches provision from the consolidation side: data is collected from entities worldwide in a controlled workflow, then provision, country-by-country reporting, transfer pricing and Pillar Two calculations run on the same data. It integrates with Oracle, SAP, NetSuite, Workday, Microsoft Dynamics and other ERPs. It suits groups with many foreign entities and a finance-led close. Capterra reviewers note the price point is high.
Pricing: Longview Tax does not publish a starting price, public plan comparison, or named self-service tiers. Buyers receive an enterprise quote based on their tax processes, entities, reporting requirements, integrations, and deployment needs. Capterra reviewers describe the price point as high and note that access may need to be limited by user cost.
Supports both ASC 740 and IAS 12 tax provisioning in one centralized platform.
Excel push-and-pull functionality supports familiar working papers and data refreshes.
Combines provisioning, tax transparency, transfer pricing, and Pillar Two workflows.
Pricing is quote-based and reviewers describe the product as expensive on a per-user basis.
The interface and Excel formulas can require training before they feel intuitive.
Some users report limited interim reporting and the need for manual workarounds.
Automated corporate income-tax provision software for tax teams reporting under ASC 740, with traceable calculations and audit-ready reports.
Bloomberg Tax Provision is a cloud ASC 740 tool aimed at tax departments that have outgrown spreadsheets but do not need a full enterprise suite. It handles multiple entities, jurisdictions and currencies and connects to Bloomberg Tax Workpapers, Fixed Assets and Research, which many tax teams already subscribe to. A practical choice for pre-IPO and newly public companies setting up a controlled provision process. Pricing is quoted.
Pricing: Bloomberg Tax Provision is sold through a sales-led quote rather than a published price schedule. Buyers request pricing or a demonstration for their provision workflow.
Its ASC 740 balance-sheet model is designed to keep calculations and rate reconciliations tied without end-of-process manual manipulation.
Cell-level change tracking and formula-based Excel exports give reviewers and auditors detailed evidence of how numbers were produced.
No proprietary scripting, schemas, or mapping is required to maintain the provision workflow.
Pricing is quote-based, with no public subscription range or published entry price.
The clearest integration value is inside Bloomberg’s own suite; public materials do not document a broad list of third-party ERP connectors.
The product is specialized for corporate income-tax provision rather than general tax filing, sales tax, payroll tax, or bookkeeping.
Workiva is not a provision engine, but many public company tax teams use it to prepare the income tax footnote and link each number to the provision output and the 10-K. With the expanded disclosures required by ASU 2023-09, keeping the rate reconciliation and jurisdictional tables tied to source data matters more. Workiva serves 6,624 customers, includes unlimited users and reports $884.6 million in 2025 revenue. Vendr puts average contracts near $50,000.
Pricing: Workiva prices and packages solutions according to organizational needs and provides customized demos and quotes. Every Workiva offering includes unlimited seats or users; AWS Marketplace shows a $1,000,000 per-12-month Workiva Platform dimension billed under contract, while Vendr reports a $49,914 average contract value from 102 deals as a market benchmark rather than official entry pricing.
Linked data can reduce inconsistent figures and repeated manual copying across reports.
Collaboration, permissions, approvals, version history, and audit trails support assurance work.
Financial reporting, sustainability, and GRC capabilities share a connected platform.
Pricing is customized and enterprise contracts may require significant budget.
Implementation and configuration can be more involved than with lightweight audit tools.
The breadth of the platform can create a learning curve for new users.
The income tax provision has always been one of the most complex parts of the quarterly close. A tax team has to estimate current tax for every jurisdiction, track every difference between book and tax accounting, measure deferred tax assets and liabilities, assess whether deferred tax assets will be realized, and explain the effective tax rate. All of this happens in days, under SOX controls, and is reviewed by the external auditor. Income tax has long been one of the more common areas for material weaknesses in internal control.
Three changes since 2024 have added to the load:
ASU 2023-09. The FASB's new income tax disclosures require a detailed rate reconciliation with set categories and income taxes paid by jurisdiction. Calendar-year public companies applied them for the first time in their 2025 annual reports.
US tax law changes. The One Big Beautiful Bill Act, enacted July 4, 2025, changed research cost treatment, bonus depreciation, interest deductibility and the international regime. Each change touched deferred taxes and had to be reflected in the period of enactment.
Pillar Two. The global minimum tax has applied in many countries since 2024. The side-by-side package agreed in January 2026 relieves US-parented groups of the income inclusion and undertaxed profits rules, but domestic minimum top-up taxes still apply where countries have adopted them.
Spreadsheet provisions break under this load because each change adds calculations, data points and review steps that must tie together.
How we chose these five
We reviewed the corporate tax tools in our tax directory and focused on those that handle ASC 740 and IAS 12 provision for mid-size and large companies. We weighted calculation coverage (current, deferred, return-to-provision, interim and rate reconciliation), integration with compliance and Pillar Two tools, data collection from ERPs, audit trail and controls, and reviewer feedback. All the products are quote-based; we found no public list prices.
Others to know: Vertex and Avalara focus on indirect tax rather than income tax provision. Larger accounting firms offer their own provision tools and managed provision services, which are common for companies without a full tax department.
Comparison at a glance
Tool
Best for
Strength
Watch out for
ONESOURCE Tax Provision
Multinationals
Shared data with compliance and Pillar Two
Implementation effort, 3.8 G2 rating
CSC Corptax
Large US-based groups
One database for provision and US returns
Enterprise scope and price
Longview Tax
Groups with many foreign entities
Consolidation-style data collection
High price point
Bloomberg Tax Provision
Mid-size and newly public companies
Cloud, connected to Bloomberg Tax research
Less depth for very complex groups
Workiva
Footnote and SEC filing
Linked disclosures, unlimited users
Not a provision engine
Which tool fits which company
Pre-IPO or newly public company. Bloomberg Tax Provision, or a CPA firm's provision service with your own review. Combine with Workiva for the 10-K if you already use it.
Large US multinational with in-house compliance. CSC Corptax or ONESOURCE. Choose Corptax if a single data model across provision and federal and state returns matters most, ONESOURCE if you want the broadest suite including indirect tax and trade.
European or Asian parent with IFRS reporting. Longview Tax or ONESOURCE, both strong on IAS 12, country-by-country reporting and Pillar Two.
ASU 2023-09 in practice
The new disclosure rules require public business entities to:
Present the rate reconciliation in a table with specific categories, including state and local taxes, foreign tax effects, effects of changes in tax laws, cross-border tax laws, tax credits, valuation allowances, nontaxable or nondeductible items and changes in unrecognized tax benefits.
Disclose separately any reconciling item equal to 5 percent or more of the statutory tax amount.
Report income taxes paid, net of refunds, by federal, state and foreign, with any individual jurisdiction equal to 5 percent or more of total taxes paid shown separately.
The practical impact is on data. Taxes paid by jurisdiction come from payment records rather than provision calculations, and foreign reconciling items must be broken down by country. Tools that already store data by jurisdiction and entity make this much easier than workbooks built around a single consolidated reconciliation.
Pillar Two after the side-by-side agreement
For US-parented groups, the January 2026 agreement removes the income inclusion rule and undertaxed profits rule exposure if the group elects the side-by-side safe harbour, which is available from January 1, 2026. It does not remove domestic minimum top-up taxes, which many European and Asian countries have enacted. A US group with subsidiaries in those countries still needs jurisdictional effective tax rate calculations, safe harbour testing and GloBE information returns where required.
For groups headquartered outside the US, the full Pillar Two rules continue to apply. The package also adds a simplified effective tax rate safe harbour from 2027 and extends the transitional country-by-country reporting safe harbour by a year.
All the enterprise tools in this guide have Pillar Two modules. Ask how the module shares data with the provision, because Pillar Two calculations start from the same financial and deferred tax data.
Questions to ask in a demo
How does trial balance data come in from our ERP, and how are mappings maintained?
Can we run interim provisions with the annual effective tax rate method and discrete items?
How does the tool produce the ASU 2023-09 rate reconciliation and taxes paid tables?
What does the audit trail show for each adjustment, and what SOX reports are available?
How does provision data flow into returns and Pillar Two?
What does implementation include, and how long did a similar customer take?
Tax provision software calculates a company's income tax expense for its financial statements under ASC 740 in the US or IAS 12 internationally. It computes current and deferred taxes, tracks book-tax differences, prepares the effective tax rate reconciliation and produces the disclosures for the tax footnote.
What does ASU 2023-09 change?
ASU 2023-09 requires a more detailed tabular rate reconciliation with specified categories, and income taxes paid broken down by federal, state and foreign jurisdictions, with individual jurisdictions above a 5 percent threshold shown separately. It applies to public business entities for annual periods beginning after December 15, 2024, and to other entities a year later.
How does the Pillar Two side-by-side agreement affect provision?
On January 5, 2026, the OECD Inclusive Framework agreed a side-by-side package. US-parented groups can elect a safe harbour that switches off the income inclusion rule and undertaxed profits rule, because the US is listed as having an eligible regime. Qualified domestic minimum top-up taxes still apply in countries that have them, so many US groups still need Pillar Two calculations for provision.
Can a small company do the tax provision in Excel?
Yes. Many private and smaller public companies use Excel workbooks prepared or reviewed by their CPA firm. Software becomes worthwhile when there are many entities and jurisdictions, quarterly reporting deadlines, SOX controls over the provision, or a need to reuse data in returns.
How much does tax provision software cost?
All the major tools are quote-based. Pricing depends on the number of entities, jurisdictions, users and modules, plus implementation services. Mid-size companies can expect five-figure annual subscriptions; global enterprise deployments often cost six figures including implementation.
What 2025 US tax law changes affect the provision?
The One Big Beautiful Bill Act, enacted July 4, 2025, restored immediate expensing of domestic research costs under new Section 174A, made 100 percent bonus depreciation permanent for property acquired after January 19, 2025, and changed international provisions, renaming GILTI and FDII to net CFC tested income and foreign-derived deduction eligible income from 2026. Companies had to reflect enactment in the quarter that included July 4, 2025.
Prices and ratings come from each vendor's public pricing pages and review sites as of October 22, 2026. Vendors change pricing often, so confirm with a quote. Nothing here is tax or legal advice.
