For 2018, no, the deadline for a regular IRA contribution for 2018 has passed. If you are asking about 2019, the W-2 income will support a regular personal IRA contribution. With $50k in box 1 of the W-2, someone under age 70½ in 2019 can make a regular traditional IRA contribution, but with $150k of modified AGI it will not be deductible due to the individual being an active participant in a workplace retirement plan (the SEP plan); to avoid confusion, a regular traditional IRA contribution should be made to a different account than the SEP-IRA contribution. $150k of modified AGI for the purpose of a Roth IRA contribution would prevent the individual from being eligible to contribute to a Roth IRA unless married filing jointly.
