Finance AI Index
Index Vendors › Thomson Reuters ONESOURCE · September 2026 Edition
Thomson Reuters · 3 categories · Ranked

Thomson Reuters ONESOURCE

101Judge labels
16First choices
25Negative labels
11 of 12Models named it
3Categories
September 2026 Edition. Every number here is derived from the raw labels under vendor table vv2026-09.2, every buyer segment counted.
Best standing
20% in Corporate tax provision for enterprise buyers
Rank 3 of 98 in the mid-market standingaccepted challenger
0 of 12 models made it the first choice on the direct prompt; 16% of its 19 labels there were negative.
By buyer segmentStrongest at enterprise.
In corporate tax provision · each standing computed within its segment · bars are 0 to 100 · the accent bar is the product's own best reading

Standing by category

Every category where a model named Thomson Reuters ONESOURCE for a mid-market B2B company. Share is first choices across the direct, paraphrase, budget and scale prompts; rank is within every product named in that category.
CategoryFunctionShareRankNegative rateLabelsQuadrant
Corporate tax provisionTax and compliance10%3 of 9816%19accepted challenger
Sales tax automationTax and compliance0%18 of 3817%6under 10 labels · led by Avalara AvaTax at 40%
Global e-invoicing complianceTax and compliance0%33 of 1080%4under 10 labels · led by Avalara at 28%

Movement

This is the first edition on this tier, so no move can be computed for Thomson Reuters ONESOURCE yet. From the next edition this section shows, per buyer segment, whether its share moved by more than the measured noise floor.

By model

How each model treated Thomson Reuters ONESOURCE across every prompt where it was named for a mid-market B2B company. Twelve models, six prompts per category.
ModelFirst choiceAlternativeMentionNegativeLabels
Claude Haiku 4.501102
GPT-5.4 mini02103
Gemini 3.5 Flash10001
Perplexity Sonar00000
Grok 4.1 Fast11103
Mistral Small00202
DeepSeek V4 Flash02327
Llama 4 Maverick00000
Qwen 3.7 Flash01113
Kimi K210315
GLM 4.7 FlashX10102
MiniMax M2.500101

By framing

Which of the six questions produced the naming. By model says how often; this says asked what. The first-choice count on the right carries the marks of the models that produced it.
FramingLabels by classFirst choices
Direct13 labels1
Paraphrase28 labels12
Comparative11 labels1not counted in share
Budget-constrained19 labels2
Scale-constrained14 labels1
Negative16 labelsNone
First choiceAlternativeMentionNegative101 labels in all, every segment counted; 16 of the 17 first choices count toward share, since the comparative and negative framings do not. The bar is one segment per label class, to scale within the framing.

What the models said for it

Verbatim evidence the judge attached to positive labels.

“Choose Thomson Reuters ONESOURCE if you are a larger, audited mid-market C-Corp with multiple subsidiaries” Gemini 3.5 Flash · Corporate tax provision · paraphrase prompt · first choice
“I'd recommend Thomson Reuters ONESOURCE as the top choice for income tax compliance software” Grok 4.1 Fast · Corporate tax provision · paraphrase prompt · first choice
“Corporate income tax (direct tax) | Thomson Reuters ONESOURCE or Vertex” GLM 4.7 FlashX · Corporate tax provision · paraphrase prompt · first choice
“I'd suggest starting with Thomson Reuters ONESOURCE” Kimi K2 · Corporate tax provision · paraphrase prompt · first choice

And against it

Verbatim evidence attached to negative labels. A warning on a product with few labels is a warning; on a product with many, it is one voice among them.

“Enterprise Options to AVOID on a Limited Budget | Thomson Reuters ONESOURCE | $200K–$2M+/year” Kimi K2 · Corporate tax provision · budget prompt · hard negative
“Avoid: Longview, ONESOURCE, Workiva, Oracle Tax Reporting, and Corptax.” DeepSeek V4 Flash · Corporate tax provision · budget prompt · hard negative
“cannot justify the six-figure price tag of enterprise suites like Bloomberg or Thomson Reuters ONESOURCE” Qwen 3.7 Flash · Corporate tax provision · budget prompt · soft negative
“Overkill for most mid-sized firms.” DeepSeek V4 Flash · Sales tax automation · paraphrase prompt · soft negative

Named alongside

The products named in the same answers as Thomson Reuters ONESOURCE, over the 101 answers that named it. Took the first choice instead counts the answers where the other product was the first choice and Thomson Reuters ONESOURCE was named but was not.
ProductSame answerTook the first choice insteadHead to head
Vertex54 of 1019Not in the top three
Avalara AvaTax31 of 10115Not in the top three
Sovos27 of 1014Not in the top three
CSC Corptax24 of 1013Not in the top three
TaxJar21 of 1010Not in the top three
Avalara19 of 1012Not in the top three
Longview Tax18 of 1014Not in the top three
Anrok13 of 1010Not in the top three
TaxCloud10 of 1010Not in the top three
A head-to-head page exists where both products are in a category's top three. The other rows are the same fact without a page behind them, so they link to the product instead.

What carried it into the answer

The sites and pages cited by the answers that named Thomson Reuters ONESOURCE. A fact about retrieval, not a lever on the model.

Citations exist only for the models that return a source list, four of the twelve in this edition, so these counts come from 84 of the 101 answers that named Thomson Reuters ONESOURCE and are not a share of its labels.

Domains cited

worldmetrics.org48
tax.thomsonreuters.comYour site41
gitnux.org35
guideflow.com35
wifitalents.com35
zipdo.co32
avalara.com31
wolterskluwer.com27
pro.bloombergtax.com26
gartner.com23

292 of the 333 domain citations in answers naming Thomson Reuters ONESOURCE came from somebody else's page.

Pages cited

Pages are listed as the models cited them.

Names read as Thomson Reuters ONESOURCE

What the judge wrote, as written, with how often. The vendor table decides that these count as Thomson Reuters ONESOURCE; a claim can dispute any of them.
ONESOURCE 5ONESOURCE (Thomson Reuters) 2Thomson Reuters 2
Is this your product?

Claim this page

Claiming is free and changes nothing in the data. A claimed page shows a verified contact who is told when each edition publishes and when Thomson Reuters ONESOURCE's standing changes by more than the noise floor; the right to propose corrections to the vendor table, meaning names the judge wrote that should or should not read as Thomson Reuters ONESOURCE, applied by version and listed in the change log; and a one-line description supplied by the vendor and marked as such.

It does not get any change to labels, shares or verdicts, any preview, or any say over which quotes appear. A verification link goes to your work email; an address at thomsonreuters.com is approved on the spot, any other address is reviewed by hand.

Your name and company appear on the claimed page, or the company alone if you ask below. A title and a LinkedIn address appear there too if you give them, and are left off if you do not. Your email address is never published.

Subscribe to the pack