H1B Taxes Explained: State, Federal, and FICA

Congratulations! You've successfully navigated the H1B lottery and transitioned from an F1 student visa to a dual-intent worker visa. While your career is advancing, your tax situation is about to become significantly more expensive.

The most immediate shock for new H1B holders is the sudden appearance of FICA taxes on their paystubs. While F1 students are generally exempt from FICA (Social Security and Medicare taxes) for their first five calendar years in the US, H1B workers are not. FICA takes a flat 7.65% out of your gross salary (6.2% for Social Security up to a wage base limit, and 1.45% for Medicare), matching your employer's contribution. On a $100,000 salary, this means an instant $7,650 reduction in your annual take-home pay compared to your OPT days.

Furthermore, H1B holders must pay close attention to the Substantial Presence Test (SPT). Once you meet the SPT criteria, the IRS classifies you as a 'resident alien' for tax purposes. This means you will be taxed on your worldwide income, not just your US-sourced income. It is crucial to use an H1B tax calculator to estimate your new net pay and adjust your budget accordingly. On the bright side, resident aliens are allowed to claim the standard deduction and can contribute freely to tax-advantaged accounts like 401(k)s and IRAs to lower their taxable income.