The company that makes TurboTax and other tax software says an "all hands on deck" approach over the weekend led to fixes of the problems with Minnesota returns.
Intuit said in a statement it has released fixes to resolve programming errors that affected Minnesota customers.
The state Revenue Department had warned of the problems on Friday and advised Minnesotans to avoid using Intuit-made software.
Minneapolis-St. Paul Business Journal reports the errors led the software to show taxpayers with larger refunds than they were actually entitled to.
A Revenue Department official told the Star Tribune some taxpayers will have to re-file their returns. But Intuit promised to cover any extra tax preparation costs its customers incurred.