Bloomberg Tax Provision vs ONESOURCE Tax Provision

The verdict at a glance

ONESOURCE Tax Provision scores higher overall (76 to 71), but the right pick depends on what you weight.

Bloomberg Tax Provision is ASC 740 income tax provision software for US mid-market and large corporate tax departments that calculates current and deferred tax with state-by-state detail, the rate reconciliation and footnote reports, sold on a vendor claim of go-live in under two months.

ONESOURCE Tax Provision is Thomson Reuters' ASC 740 and IFRS income tax provision software for corporate tax departments at upper mid-size and multinational companies, calculating current and deferred tax, the rate reconciliation and journal entries.

Quick facts

• Bloomberg Tax Provision AF score. 71/100
• Bloomberg Tax Provision implementation. Low
• Bloomberg Tax Provision best fit. US mid-market teams leaving Excel
• ONESOURCE Tax Provision AF score. 76/100
• ONESOURCE Tax Provision implementation. High
• ONESOURCE Tax Provision best fit. Multinationals with SOX close

Dimension by dimension

• Compliance depth. Bloomberg Tax Provision 74, ONESOURCE Tax Provision 83. Edge: ONESOURCE Tax Provision.
• Scalability. Bloomberg Tax Provision 66, ONESOURCE Tax Provision 80. Edge: ONESOURCE Tax Provision.
• AI / agent readiness. Bloomberg Tax Provision 40, ONESOURCE Tax Provision 48. Edge: ONESOURCE Tax Provision.
• Support. Bloomberg Tax Provision 78, ONESOURCE Tax Provision 68. Edge: Bloomberg Tax Provision.
• Implementation. Bloomberg Tax Provision 86, ONESOURCE Tax Provision 58. Edge: Bloomberg Tax Provision.
• Pricing transparency. Bloomberg Tax Provision 28, ONESOURCE Tax Provision 30. Edge: ONESOURCE Tax Provision.
• Tax content & coverage. Bloomberg Tax Provision 72, ONESOURCE Tax Provision 86. Edge: ONESOURCE Tax Provision.
• Integrations & data flow. Bloomberg Tax Provision 58, ONESOURCE Tax Provision 81. Edge: ONESOURCE Tax Provision.

Pick Bloomberg Tax Provision if

• A US tax department of ten or fewer people running a multi-state ASC 740 provision in Excel that needs software live before the next year-end close.
• A company whose auditor wants state-by-state deferred tax in place of a blended state rate across dozens of entities and hundreds of state filings.
• A team already paying for Bloomberg Tax Research or Workpapers that wants current rates and workpaper data flowing into the provision.

Pick ONESOURCE Tax Provision if

• A public multinational with dozens of legal entities, several currencies and a SOX-tested quarterly provision that still runs on Excel workbooks.
• A tax department already on ONESOURCE Income Tax that wants provision data to flow into the return without rekeying.
• An SAP S/4HANA shop that wants trial balances pulled into the provision and tax journal entries posted back automatically.

Further reading

• DMI Tax Position Manager calculations flow into Provision (Bloomberg Tax Provision, Sep 2026)
• Controlled Calculations launched for Bloomberg Tax Workpapers (Bloomberg Tax Provision, Aug 2026)
• Next generation of Bloomberg Tax Provision announced (Bloomberg Tax Provision, Aug 2026)
• Short AMERS outage (ONESOURCE Tax Provision, Sep 2026)
• Orbitax Pillar Two workflow promoted alongside the provision (ONESOURCE Tax Provision, Aug 2026)
• Jurisdiction-level bridge mapping and faster bridge imports (ONESOURCE Tax Provision, Mar 2026)

Keep exploring

• The full Bloomberg Tax Provision review: scores, pricing, and where it fits.
• The full ONESOURCE Tax Provision review: scores, pricing, and where it fits.
• Bloomberg Tax Provision vs CSC Corptax
• Bloomberg Tax Workpapers vs ONESOURCE Tax Provision
• Longview Tax vs ONESOURCE Tax Provision
• ONESOURCE Tax Provision vs Oracle Cloud EPM Tax Reporting

Both reviews are updated on a rolling cycle by our research agents.