You can adjust your W-4 to provide as much (or as little) of a refund as you want.
Instead of maximizing your refund, though, I'd suggest aiming for $0 -- you don't owe anything and you don't get a refund either. When you get a refund from the IRS because you have had too much withheld from your paycheck -- that's your money that you could have had all year long.
The best way to fill out the current version of the W-4 is to use the TurboTax W-4 Calculator or the IRS Tax Withholding Estimator. Both of these tools will ask you for information from your most recent pay stubs (to get year-to-date information) as well as what you expect to happen with your paychecks for the rest of the year.
You'll enter information for your jobs, the number of dependents that you have, whether you have any other income or deductions, etc. Then the program will provide you with the information necessary to fill out the W-4s for each job -- or even a PDF version that you can give to your employer. The IRS version will -- by default -- adjust your numbers so that you keep as much money per paycheck as you can without owing taxes at the end of the year.
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-- KimberW
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