Your TSP contributions will appear in Box 12 of your W-2...

Is a traditional TSP taxable in NJ state?

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Your TSP contributions will appear in Box 12 of your W-2 (Code D or AA, depending on whether they were pre-tax contributions (regular 401k) or after tax contributions (Roth 401K).

Under New Jersey law, contributions to retirement plans (other than 401(k) Plans) are included in State wages on the W-2 in the year the wages are earned. This may cause your State wages (Box 16) to be higher than your Federal wages (Box 1).

http://www.state.nj.us/treasury/taxation/pdf/pubs/tgi-ee/git1.pdf