Not exactly sure what you are asking. since a Roth Contribution doesn't affect your taxable income, it doesn't affect your taxes. you will pay more in taxes of $146k than $142k but even if the law was changed to raise the MAGI limit for a ROTH your taxes wouldn't change. in any case, there is no rush to see if you can make a ROTH contribution. you have until the original due date of the return and its possible to do year-end tax planning to keep your MAGI within the Roth limits
