What did I do wrong to owe $531 when every other year it has been $0 0

[AmyC]

Not enough tax was withheld on your income. This often happens when people change jobs or get a promotion that changes their income tax bracket.

You will want to fill out a new w4 with HR to withhold more money. The IRS starts charging penalties when you owe $1,000. 

See  Why did my refund go down compared to last year's? for more scenarios and information.