(MONEY Magazine) – As soon as the new tax law is enacted -- it could be as early as this month -- call your tax preparer to find out if any of the changes in it will affect you significantly. You will almost certainly want to meet with your adviser if your taxable income tops $140,000 for a couple filing jointly ($115,000 for a single), or if you are a Social Security recipient or the owner of a small business. Should you fit any of these cases, get together with your tax pro no later than early October. Then you'll have time to implement any recommended tax-saving moves for 1993. Here are three key questions you may want to put to your pro: How much will I owe next April? Have your tax adviser estimate your 1993 federal income tax bill under the new tax rates. You will not be penalized by the IRS if your taxes are underwithheld simply because of the new rates. But if your tax pro says you will owe money come April 15, you can start setting enough aside for that bill and for upcoming estimated tax payments. What investments make the most tax sense now? By calculating after-tax yields based on your bracket after the new law, your adviser can help determine if you should be tilting your portfolio toward investments whose returns are tax-free, tax deferred or throw off capital gains rather than taxable income. Then discuss specifics with your investment adviser. Will I have to pay the alternative minimum tax (AMT)? As the spread narrows between your regular tax rate and the AMT rate (slated to rise from 24% to as high as 28%), this trap is more likely to ensnare you. If you have managed to keep your taxes low by shifting income to capital gains and by using substantial deductions, all those advantages could be lost. You'll need an expert to run the numbers.