Yes, that's okay. If your wages are on a W-2 and you normally get money back, then you won't need to make a payment. TurboTax will show you an entry box for "total taxes owed" and another for "total you've already paid." Just put the same figure in both ($500 is fine). Since both boxes are the same, TurboTax will tell you that you don't need to make a payment and you can continue.
If you normally owe, then you can put a smaller amount in the "taxes paid" box and make a payment of your choosing.
