There is no problem, this is how DE taxes. DE taxes based on the income level. Higher incomes pay higher tax. If both of you made over $60,000 there would be no tax difference since the top tax rate is hit. If one or both of you make less than $60,000, the combined filing separate gives you each a lower tax rate to claim a refund.
Filing MFJ is best for one income families and maybe for the child care credit - limited cases.
For 2026, DE has a house bill to increase the top tax rate. See more here.
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