A married couple has the option to file their taxes jointly – they basically combine their incomes and fill out one set of tax forms for their household. Depending on how their total incomes match up with the “filing jointly” tax brackets, how their deductions work, etc. it can end up reducing the tax burden. Not every couple benefits from filing jointly, but it often ends up saving some money.
Hell, my parents got married for tax purposes. They were fully committed in a relationship, but marriage wasn’t something that was important to them, and my dad had a rough first marriage. But the tax savings were decent, and it made health insurance for the family easier (since my mom adopted my dad’s kids from the first marriage as well), so they made a Vegas trip and sealed the deal.
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