I don't see any advantage to doing this. The impact to federal taxes is generally positive filing married vs. separately.
That is COMPLETELY false.
There is a reason it's called "Marriage tax penalty"
1) Your tax brackets change
Single:
10% $0 – $8,925 $
15%: $8,926 – $36,250
25%: $36,251 – $87,850
28%: $87,851 – $183,250
33%: $183,251 – $398,350
35%: $398,351 – $400,000
39.60%: $400,001+
Married:
10%: 0 – $17,850
15%: $17,851 – $72,500
25%: $72,501 – $146,400
28%: $146,401 – $223,050
33%: $223,051 – $398,350
35%: $398,351 – $450,000
39.60%: $450,001+
As you can see, at the 25% mark the tax brackets stop being 2x the amount of single, hence tossing you in the next bracket early. As it goes down the line it gets worse. This is obviously one of the many things in life that needs updating, because it's clearly back from the days of women being stay at home wives.
2) Deductions.
When filing single, you must have deductions of ~$6k+ to make it worth itemizing.
When filling married, REGARDLESS if you file separate or jointly, you must have ~$10k in deductions to make it worth itemizing instead of taking the standard. Which blows balls, because a married couple is less likely to have, say, 1 house per person to help make it to the itemized deduction threshold
Don't get me wrong, if you have a family where there is one breadwinner you will come out ahead - but that's not very likely for the average american anymore. VERY few people have a breadwinner making $150k+ and a wife that doesn't work.
tl;dr: Marriage is a tax PENALTY
https://en.wikipedia.org/wiki/Marriage_penalty