CNNMoney reports that the federal government’s lack of recognition of same-sex marriages, which forces legally married couples to file separately on their federal returns, results in as much as $6,000 per year in additional taxes.

Since the federal government doesn’t recognize same-sex marriage, gay couples who are living in states that do recognize their various legal unions must still file separate federal returns. That requires more record-keeping and planning than their heterosexual counterparts — and oftentimes, gay couples will have to pay more to an accountant to prepare their returns.