The formula to be used is:
Separate tax liability
- (divided by) -
(Combined separate tax liabilities x joint estimated tax payments)
During 20XX, Adam and Betty make joint estimated tax payments of $2,000, Betty also has tax withholding of $1,000. Adam and Betty decide to file separate returns for 20XX but fail to agree on how to divide their 20XX joint estimated tax payments. Adam has a separate tax liability after credits of $1,500. Betty has a separate tax liability of $1,100 before credit for withholding of $1,000. Using the formula stated above, Adam's share of the estimated tax payments is $1,154 ($1,500 ÷ $2,600 x $2,000). Betty's share of the estimated tax payments is $846 ($1,100 ÷ $2,600 x $2,000). Adam will owe a net amount of $346 ($1,154 - $1,500) and Betty will receive a refund of $746 ($846 + $1,000 - $1,100).
Or. Admin. Code § 150-316-0470
Formulas referenced are available from the agency.
Stat. Auth.: ORS 305.100
Stats. Implemented: ORS 316.567