No, there's no rules. You can switch from MFJ to MFS (or vice versa) each year. Each of you will have to enter the other’s information on your respective tax returns.
Also, there are other rules that you must follow if you file MFS and live in a community property state. TurboTax will guide you through the screens.
For additional information, review the TurboTax articles Should You and Your Spouse File Jointly or Separately? and Married Filing Separately in community property states
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