Side by side
Sidr Tax vs Tax Series
Both stand on tax compliance software. Which one you can start free with, which one lets you read the code, and what each costs once you pay.
Free plan API
Sidr Tax covers monitoring, registration, and filing, with a free analysis tier and paid automation. Confirm the Plus billing details and whether its API scope matches your tax workflow.
Visit Sidr Tax Free trial APIWeb
Tax Series covers multiple corporate tax processes and reuses data across them. Pricing requires a request, but a full-cycle proof of concept is available at no cost before licensing.
Visit Tax SeriesThe facts
| Sidr Tax | Tax Series | |
|---|---|---|
| Free plan | Yes | Not published |
| Open source | Not published | Not published |
| Runs on | API | API, Web |
| Lowest paid plan | Plus: $60 a month | Free or on request |
| Plans published | 3 | 1 |
| Maker | Sidr Tax | Tax Series |
| Website | sidr.io | taxtechnologies.com |
| On tax compliance software | #19 of 105 | #23 of 105 |
Sidr Tax: what it does well
- Free nexus monitoring across all states
- Automated sales tax return filing
- Registration and deregistration support
- CSV imports and liability analysis
- API access is available
What to know first
- Does not provide sales tax calculation
- Plus billing includes per-filing charges
- Only sales tax is supported
Tax Series: what it does well
- Supports provision under ASC 740.
- Compliance includes Forms 5471, 8865, and 8858.
- Data Collector tracks work across preparers and reviewers.
- Proof of concept covers a full tax cycle at no cost.
- Three months of read-only data access after termination.
What to know first
- Pricing is on request.
- Proof of concept typically takes 2–10 weeks.
- Tax Series is positioned for corporate tax processes.
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