Married couples then had to decide how to claim deductions like childcare or home mortgage interest.

Formerly, Davis had to charge LGBT couples accordingly, billing for each individual return. Now it is just one fee. "But that's OK with me," she said.
It is also easier for same-sex couples to use automated software such as Intuit Inc's TurboTax.

"They're able to file one state and one federal, instead of multiple. It reduces tax prep time and cost," said Lisa Greene-Lewis, a CPA and tax expert with TurboTax.

2. Welcome to the marriage penalty
Carol Berger, a certified financial planner for Berger Wealth Management in Peachtree City, Georgia, got married in July 2015, in celebration of the Supreme Court decision.

Running projections for her taxes this year with her wife has been an eye-opener. "The thing that surprises a lot of people is that they fall into a higher tax bracket," she said.

They will go from receiving a refund of several thousand dollars when they filed individually to owing money this year, filing jointly. Because Berger is an independent contractor, she did not adjust her quarterly estimated tax payments enough after the wedding to account for the change brought on by adding in her wife's income.

She is learning, though. Before Berger files this year, she plans on making contributions to a self-employed retirement account to lower her tax burden. She also already tripled her first quarterly payment for 2016.

3. Look-backs can be worth it
Since the tax process was so complicated in previous years, same-sex couples have a window of opportunity to amend past tax returns to recoup taxes they paid unfairly. One common reason for examining past returns is health benefits for a domestic partner that might have been taxed as income.

Davis has done about 20 of these tax reviews in Oregon for couples who went through the process. TurboTax's Greene-Lewis said this is something that taxpayers can do on their own through their desktop product.

Hollar, in Florida, is not so sure he will delve into the process, however. "I have amended tax returns in my past, and it turns into future audits," he said.

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