This Saturday in Personal Finance Focus

The beginning of the fourth quarter is a good time to get out your paycheck stubs and calculate whether your withholding is on track to cover your tax bill for the year.

If it isn't -- maybe you realized some nice gains from your stock portfolio? -- it's not too late to do something about it. In Saturday's Tax Forum, Tracy Byrnes outlines some strategies to avoid under-withholding payments and penalties.

Also coming this weekend in Personal Finance Focus:

• The Big Screen searches for hidden gems among mutual funds that rate only one or two stars on Morningstar's five-star scale.

• Mark Ingebretsen shows where you can find stock screens that work in real time in Tools of the Trade.

We'll also have the top-performing mutual funds and exchange-traded funds of the week and Jim Cramer's Smarter Money column. See you Saturday.