Taxpayers and tax practitioners are encouraged to file all tax returns either through an accepted tax software product or via Revenue Online. The Department maintains a list of accepted software for C corporation income tax. The list shows supported tax software by developer name, software name, and website address.
View the Accepted Software List for C Corporations list below to verify whether a software product is approved to process tax returns for the current tax year.
Accepted Software
| Developer | Software Name | Web Address |
|---|---|---|
| Advanced Tax Solutions, LLC | MyTaxPrepOffice.com | https://app.mytaxprepoffice.com |
| CCH Incorporated | CCH ProSystem fx/990 system | https://taxna.wolterskluwer.com/ |
| Corptax, Inc | CSC Corptax | https://www.cscglobal.com/service/corptax/ |
| Crosslink | Crosslink 2026 | www.crosslinktax.com |
| Drake Software | Drake Accounting | Accounting.drakesoftware.com |
| Intead LLC | Instead | https://www.instead.com/ |
| Intuit Inc | Lacerte | https://accountants.intuit.com/tax-software/lacerte/ |
| Intuit Inc | PTO | https://accountants.intuit.com/tax-software/tax-online/ |
| Intuit Inc | Proseries Business | https://accountants.intuit.com/ |
| K1X, Inc | 990 Tracker | https://k1x.io |
| On-Line Taxes, Inc | OLTPRO WEB | www.OLTPRO.com |
| On-Line Taxes, Inc | OLTPRO DESKTOP | www.OLTPRO.com |
| Tax Technologies | Tax Series | https://www.taxtechnologies.com/ |
| TaxAct, LLC | TaxAct (Professional/Consumer) | https://www.taxact.com/ |
| TaxSlayer | TaxSlayer Pro | https://www.taxslayerpro.com/ |
| Thomson Reuters | UltraTax CS | https://tax.thomsonreuters.com/en/products/ultratax-cs |
| Thomson Reuters | GoSystem/ONESOURCE | https://cs.thomsonreuters.com//gosystem/ |
| Universal Tax Systems, Inc | ATX | https://taxna.wolterskluwer.com/ |
| Universal Tax Systems, Inc | TaxWise | https://www.wolterskluwer.com/en/solutions/tax-accounting-us |
For the upcoming tax year, the list is updated as software is approved (typically by the third week of January). Some software products allow the submission of Colorado income tax estimated payments using form DR 0112EP, and extension payments using form DR 0158-C. For estimated payments, up to four payments can be scheduled at once, but the last payment must be scheduled by the January estimated payment due date. Your software provider can tell you if they support estimated payments and extension payments for Colorado.