You're right that MSRRA does not apply, but it's still the same tax treatment. You both are part-year residents of California and Delaware. His military income is not taxed in CA because he was stationed in DE and not in DE because his CA residency protects him from being taxed there. In September, he became a Delaware resident. Your most advantageous Federal filing status is Mariied Filing Joint, for California it will be Married Filing Joint, and for Delaware I believe they allow you to file Married filing Separate on a Combined return. If this is so for a part-year return, they may allow you to enter separate move-in dates for Delaware. If they don't, use your husband's military separation date as the official one. The situation looks like it is complicated, but it actually isn't.
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