If your separate income streams are pretty predictable and so is the overwitholding, and if you care enough: you can put a negative number in the "extra withold

If your separate income streams are pretty predictable and so is the overwitholding, and if you care enough: you can put a negative number in the "extra witholding" box on your W-4. I wouldn't say this is a better strategy, but you can definitely min/max this even if your income is not stable by extrapolating out your expected income and expected witholding a few times a year and adjusting your W-4 based on your calculations.