If you owe additional tax for 2013, you may have to pay estimated tax for 2014.
You can use the following general rule as a guide during the year to see if you will have enough withholding, or if you should increase your withholding or make estimated tax payments.
General Rule. In most cases, you must pay estimated tax for 2014 if both of the following apply.
1. You expect to owe at least $500 in tax for 2014, after subtracting your withholding and credits.
2. You expect your withholding plus your credits to be less than the smaller of:
a. 90% of the tax to be shown on your 2014 tax return, or
b. 100% of the tax shown on your 2013 tax return. Your 2013 tax return must cover all 12 months.