<human>: TITLE CORRECTION: We've been married 10 years, not 20

My wife and I owe $5000 in taxes, which is about what we expected, because of about $20k in 1099 income that I earned last year on top of my regular job. 

My wife just finished school and didn't start working until August. She handled all the finances up until September when we agreed it would be easier if I did it since I was willing and able to put the time necessary into it. Up until that point, we were both very bad about our spending and wasted a lot of money. 

She did, however, receive a $20k check from her son's father, who was several years behind in child support. She used about $12k of that money to pay off credit card debt I didn't realize she had. While most of that debt was accrued, I was footing the bill for her school. But it's water under the bridge at this point. I'm glad she's done with school and she has a job she loves.

We both agreed in September that it would be better if we had separate accounts so we could both be responsible for our own spending. We have a 70-30 split on bills because my salary is significantly more than hers. 

So we each have about $7k in our separate savings accounts. Should I be responsible for the entire $5k of our tax bill, or should we split it 70-30 like we do our other bills?

Give me the gist of the text in a nutshell
<bot>: We owe $5000 in taxes but I'm not sure whether we should split it or if I should pay all of it.