Yes, for some taxpayers, Married Filing Separately causes a huge increase in taxes. This is because many tax benefits like Earned Income Credit aren't allowed when you file separately. Follow this link for a complete list of tax benefits not allowed when filing separately.
In addition to that, your standard deduction for filing jointly is double that for Single or Married Filing Separately, so having spouse with a small income saves you a lot on your taxes.
If you haven't already, you need to update your W-4 form with your employer, so you don't owe so much for 2024. Follow this link for more about that.
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