How to calculate MA state SS and medicare tax

Hello,

I worked approximately 2 weeks out of the year in MA and I have to file a MA state return as Non-resident. The W4 shows wages for $7148 out of total federal of $105364. Total SS+Medicare = $8061. The W4 doesn't show the MA portion for the SS+Medicare. When I get to the TT screen of "Non-Massachussetts portion of deductions", the SW is pre-populating a figure equal to $7176 to the Non-MA portion of the total SS+Medicare. I cannot find out where this figure comes from. Do you know how TT estimates it?

I try to calculate that non-MA portion of SS+Medicare:
1- I calculated the percentage of wages for MA with respect to total 7148/105364 = 0.0678410083140352
2- I multiplied this percentage times the total amount of SS+Medicare =0.0678410083140352 * 8061 = 546.8 ~= 547. This should be the MA portion of the SS+Medicare.
3- The non-MA portion of SS+Medicare = 8061 - 547 = 7514

Is this calculation correct?

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