Your right Peter I must have misunderstood it. Here are some of the exemptions
Andy
Penalty for Underpayment of Estimated Tax
If you didn’t pay enough tax throughout the year, either through withholding or by making estimated tax payments, you may have to pay a penalty for underpayment of estimated tax. Generally, most taxpayers will avoid this penalty if they owe less than $1,000 in tax after subtracting their withholdings and credits, or if they paid at least 90% of the tax for the current year, or 100% of the tax shown on the return for the prior year, whichever is smaller. There are special rules for farmers, fishermen, and certain higher income taxpayers. Please refer to Publication 505, Tax Withholding and Estimated Tax, for additional information.