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Chapter 2
Avoiding
Estimated Tax Penalties
Year-end Tax Moves

1998 Tax Guide
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Avoiding Estimated Tax Penalties

Federal tax law requires the payment of income taxes throughout the year as you


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earn your income. This obligation may be met through withholding or quarterly estimated tax payments or both. For 1998, if total tax minus withholding and payments is less than $1,000, you will not be assessed a penalty for underpayment of estimated tax. However, if you overpay your estimated taxes, you are in effect making an interest-free loan to the government, which you would probably prefer to avoid. The penalty for underpayment is calculated as interest on the underpaid balance until it is paid, or until April 15, 1999, whichever is earlier. The interest rate on underpayments in 1998 is 8 percent (as of September 30, 1998), and the rates for 1999 will be announced quarterly by the IRS. The rates are adjusted under a prescribed formula in response to changes in federal short-term interest rates.

  • Methods for Avoiding Estimated Tax Penalties for 1998 Taxes. There are several ways to avoid estimated tax penalties. The basic rule is to pay the required amount by the end of the year through withholding and quarterly estimated payments. The required amount will be one of the following, depending on the individual taxpayer’s situation:

    • 90 percent of the current year’s tax liability.
    • 100 percent of the prior year’s tax liability (regardless of adjusted gross income amount).
    • 90 percent of the tax liability based on a quarterly annualization of current year-to-date income.

    Penalties are based on the difference between the lowest amount required to be paid by each quarterly payment date and the amount actually paid by that date. If payments are based on one of the first two alternatives above, the annual required amount must be divided equally among the four quarters to determine the cumulative amount due at each quarterly payment date. In the case of annualized income, however, the amount due by each payment date is determined based on income to date. Thus, the annualization method may be the one for you to use if you accrue or receive much of your income during the latter part of the year, because the annualization method allows for lower required payments in the early quarters. Table 2-2 illustrates the amount required to be paid (cumulatively) for 1998 taxes under each method by each date.

    Table 2-2
    Cumulative Amount of Estimated Taxes to Be Paid
    Due Date
    1997 Tax Payment Methods 15 April 15 June 15 Sept 15 Jan
    Current year's tax 22.5% 45% 67.5% 90%
    Prior year's tax (safe harbor): 25% 50% 75% 100%
    Tax on annualized income
    to date
    22.5% 45% 67.5% 90%


    Payments made through withholding from your paycheck (or from your pension or other payments) are given special treatment. The IRS treats income tax that is withheld as having been paid equally throughout the year (unless you prefer to use actual payment dates). This lets you make up for underpaid amounts retroactively, because amounts withheld late in the year may be used to increase the amounts deemed paid in earlier quarters.

    Thus, you may reduce or avoid underpayment penalties by adjusting withholding late in the year, something you cannot do with quarterly estimated tax payments. If you find that your payments to date are inadequate, you should arrange with your employer or pension provider to adjust your withholdings to the extent possible to cover any anticipated shortfall. The additional amount must be withheld before December 31 to apply to the current year’s tax. If you cannot adjust withholding, you should at least make a prompt quarterly payment, which will stop the growth of underpayment penalties.

  • State and Local Rules. Most of the state and local taxing districts have similar rules and penalties related to the prepayment of income taxes during the year. Since many states have prepayment rules that vary from the federal requirements listed above, you need to become familiar with the rules for the states and localities in which you file returns, and take the steps necessary to avoid underpayment interest and penalties. You must therefore judge the adequacy of the tax payments to authorities at all levels.

  • Other Taxes. When computing your required estimated tax payments, do not overlook the increasing number of "other taxes" that apply in addition to the regular income tax. Some, such as the self-employment tax and the alternative minimum tax, have existed for many years. Others, such as the employment taxes for domestic employees, are relatively new. For 1998 and thereafter, employers must include FICA taxes for domestic employees in calculations of their own estimated tax liabilities.

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