: How to determine how much is paid to OASDI? Same state. Same status. I recently switched jobs (0k to 0k) and I noticed a huge amount goes to OASDI but before I didn't pay any. My overall tax deduction went from 24%

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I am not-resident on a visa if that matters.

This is likely the reason. There are a number of groups that can be exempt from paying OASDI, and nonresidents are one of them. It will depend on the specific visa, and the specific employer; you can get the full details at Aliens Employed in the U.S. – Social Security Taxes

If this is the case, it is possible it is either a misclassification by your new employer, or that the new employer no longer falls under the exemption requirements.

If youare not exempt, then the details are described at OASDI and SSI Program Rates & Limits, 2018; for a W2 employee, it would be 7.65% for the first 8,400 (SSI and Medicare); 1.45% on 8,401-0,000 (Medicare), and 2.35% thereafter (Medicare at the high-earner's rate). For a 1099 contractor, who is paying both the employer and employee portions, it would be 15.3% on the first 8,400, 2.9% for 8,401-0,000, and 3.8% thereafter (all rates being doubled except the 0.9% high-earner's addition applied after 0,000).