How to calculate the different portions of deductions by state?

I worked in 3 different States in 2019, and when filing my state tax, I am being asked to "Enter the non-State (in this case Massachusetts) portion of the amount you paid during 2019 to social security (FICA), railroad, medicare, US or Massachusetts retirement"? How would I know how much is for each State portion?

1953

Expert Alumni

Mar 6, 2020 6:08:42 PM

Take each state and divide by the total. Take the MA income and divide it by your total income. Multiply that percentage times the total of each category.

For example:

You earned $10,000 in MA and $40,000 total on all W2s.
($40,000 total - $10,000 MA = $30,000 non-MA income - see more below)
$10,000 MA divided by $40,000 total equals 25%.
Add up all the Medicare on all W2 forms.
Multiple the total Medicare by 25%,
Add up all the Social Security on all W2 forms
Multiply Social Security by 25% and so on.
Keep adding and multiplying as needed

If you need it the other way around, you can do the non-MA

$30,000 non MA divided by $40,000 total equals 75%.
Add up all the Medicare on all W2 forms.
Multiple the total Medicare by 75%,
Add up all the Social Security on all W2 forms
Multiply Social Security by 75% and so on.
Keep adding and multiplying

If all income on the W2 was MA, no math required. Just look at the form.

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How to calculate the different portions of deductions by state?