Do-io
Do-io is a CPA-designed tax calculator for tax professionals preparing federal tax estimates.
What Do-io is
Do-io is a CPA-designed tax calculator for tax professionals preparing federal tax estimates. It organizes calculations around common items on a federal return and is intended to produce conservative results, with tips shown in the calculator. The tool does not cover every tax-return line or possible credit, and state tax estimates are left to the user. Firms can embed the calculator on their websites so clients can run estimates, while the Custom Plan adds firm branding. Access is available in a browser, through OpenAsApp as a mobile app, as a Chrome extension, or through an embedded website calculator. Users create a username and password; the maker says no names, addresses, Social Security numbers, dates of birth, or other personally identifiable information are collected, and multi-factor authentication is not required. Reports can be printed to PDF. Plans include one-week and annual options, with annual plans carrying a 7-day money-back guarantee.
Good
- Federal calculator built around common return items
- Embeddable on firm websites
- Custom branding available
- PDF report printing
- Browser and Chrome extension access
Watch out
- No state tax estimates
- Does not cover every credit or return line
- No scenario modeling
- No free plan
Who it suits
Do-io suits tax professionals who need federal estimates and firms that want clients to run branded, embedded calculations. It is less suited to state estimates, side-by-side scenarios, or complex projections.
Verdict
Do-io provides focused federal tax estimates across browser, extension, mobile, and embedded formats. Its stated limits make more sophisticated projection software necessary for complex or comparative work.
Plans and prices
From Do-io's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Wage Wizard One-Week Plan | $10, paid once | Projects wages and withholdings using paystub data · 2026 version only · no subscription needed · valid for 7 days |
| Do-io One-Week Plan | $25, paid once | Federal tax calculator · 2026 version only · no subscription needed · valid for 7 days |
| Wage Wizard | $59 a year | Wage Wizard access · per user, sold separately |
| Standard Plan | $249 a year | Selected tax year plus January 1–April 30 of the following year · standard branding · per user |
| Custom Plan | $349 a year | Includes Standard Plan features · custom firm branding · per user |
The facts
Each one read from Do-io's own pages, with the date it was checked.
What it does
- Access options
- Do-io can be used in a browser, as a mobile app through OpenAsApp, as a Chrome extension, or embedded on a website.checked 4 Oct 2026
- Authentication
- Users create a username and password, and the maker says multi-factor authentication is not required.checked 4 Oct 2026
- Branding
- The Custom Plan allows firms to customize the app’s appearance with their branding.checked 4 Oct 2026
- Data collection
- The maker says the calculator does not ask for names, addresses, Social Security numbers, or dates of birth, and says it does not collect personally identifiable information.checked 4 Oct 2026
- Embedding
- The calculator can be embedded on a firm website so clients can run their own estimates.checked 4 Oct 2026
- Federal estimates
- Do-io is a federal tax calculator designed around popular items on a federal tax return.checked 4 Oct 2026
- Guarantee
- The maker says annual plans include a 7-day money-back guarantee.checked 4 Oct 2026
- Limits
- Do-io does not include every tax-return line or every possible credit, and the maker recommends more sophisticated projection software for side-by-side scenarios or complex situations.checked 4 Oct 2026
- Output
- After a calculation, users can print a report to PDF.checked 4 Oct 2026
- Purpose
- Do-io is a CPA-designed app for tax professionals that simplifies tax calculations and tax estimates.checked 4 Oct 2026
- State taxes
- Do-io focuses on federal calculations and leaves state tax estimates to the user.checked 4 Oct 2026
- Support
- The site lists [email protected] as its contact email.checked 4 Oct 2026
Where it runs
- Estimation approach
- The maker says Do-io is designed to produce conservative results and provides tips in the calculator.checked 4 Oct 2026
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