Best Sigma Tax Pro Alternatives in 2026
Updated
20 platforms from small business tax software ranked against Sigma Tax Pro on the same published basis.
- 1Sigma Tax Pro vs Tax Series
- 2Sigma Tax Pro vs X.TAX Business Tax
- 3Sigma Tax Pro vs ONESOURCE Certificate Manager
- 4Sigma Tax Pro vs TaxAct
- 5Sigma Tax Pro vs H&R Block Online
- 6Sigma Tax Pro vs TurboTax
- 7Sigma Tax Pro vs Instead
- 8Sigma Tax Pro vs ProConnect Tax
- 9Sigma Tax Pro vs UpTax
- 10Sigma Tax Pro vs CCH Axcess Practice
- 11Sigma Tax Pro vs Drake Tax
- 12Sigma Tax Pro vs Go Tax Pro
- 13Sigma Tax Pro vs MyTAXPrepOffice
- 14Sigma Tax Pro vs nLync 1040 Software
- 15Sigma Tax Pro vs OLTPro
- 17Sigma Tax Pro vs Sure-Fire Tax Software
- 18Sigma Tax Pro vs TaxFile
- 19Sigma Tax Pro vs TaxOwl Pro Business
- 20Sigma Tax Pro vs TaxSlayer Pro
- 21Sigma Tax Pro vs TTS Tax Software
Sigma Tax Pro alternatives compared
| # | Platform | Score | Free plan | From | Runs on |
|---|---|---|---|---|---|
| 1 | Tax Series | 6.8 | No | — | API, Web |
| 2 | X.TAX Business Tax | 6.7 | No | — | API, Web |
| 3 | ONESOURCE Certificate Manager | 6.6 | No | — | API, self-hosted, Web, Windows |
| 4 | TaxAct | 6.0 | Free plan | $44.99/mo | Web |
| 5 | H&R Block Online | 5.9 | Free plan | Free | Web, iOS, Android |
| 6 | TurboTax | 5.9 | Free plan | $79/mo | Web |
| 7 | Instead | 5.7 | Free plan | Free | Web |
| 8 | ProConnect Tax | 5.3 | No | $17.50/mo | Web, Windows |
| 9 | UpTax | 5.3 | No | — | Web |
| 10 | CCH Axcess Practice | 5.2 | No | — | Android, iOS, Web |
| 11 | Drake Tax | 5.2 | No | $25/mo | Mac, Web, Windows |
| 12 | Go Tax Pro | 5.2 | No | — | Android, iOS, Web |
| 13 | MyTAXPrepOffice | 5.2 | No | $74.58/mo | Android, iOS, Linux, Mac, Web, Windows |
| 14 | nLync 1040 Software | 5.2 | No | — | Web |
| 15 | OLTPro | 5.2 | No | — | Android, iOS, Web, Windows |
| 17 | Sure-Fire Tax Software | 5.2 | No | $56.58/mo | Mac, Web, Windows |
| 18 | TaxFile | 5.2 | No | $3.25/mo | Web |
| 19 | TaxOwl Pro Business | 5.2 | No | $24.92/mo | Android, iOS, Linux, Mac, Web, Windows |
| 20 | TaxSlayer Pro | 5.2 | No | $116.25/mo | iOS, Mac, Web, Windows |
| 21 | TTS Tax Software | 5.2 | No | $297/mo | Web |
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Questions about Sigma Tax Pro alternatives
What is the best alternative to Sigma Tax Pro?
Tax Series, number 1 in small business tax software with a score of 6.8 out of 10. The others here: X.TAX Business Tax, ONESOURCE Certificate Manager, TaxAct and 16 more.
What is the best free alternative to Sigma Tax Pro?
TaxAct is the best-ranked alternative with a free plan. 4 of the 20 alternatives here publish a free plan on their own pricing pages.
How are these alternatives ranked?
Ranked on what each maker publishes, open and connectable first: a public API, open-source code, the depth of its documentation and a free tier to try it on. Model lists are sorted by the figure in their title, exactly as each provider publishes it.