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I assume that you are concerned about 2015 tax filing?Generally - when we prepare W4 form for a second job - the form is prepared as Single with ZERO allowances to maximize withholding.
The United States income tax system is a pay-as-you-go tax system, which means that you must pay income tax as you earn or receive your income during the year. You can do this either through withholding or by making estimated tax payments. If you do not pay your tax or you pay an insufficient amount of tax through withholding, you might also have to pay estimated taxes. If you did not 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 either owe less than $1,000 in tax after subtracting their withholding and estimated tax payments, 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.
if you receive income unevenly during the year, you may be able to vary the amounts of the payments to avoid or lower the penalty by using the annualized installment method. Use Form 2210 , Underpayment of Estimated Tax by Individuals, Estates, and Trusts, to see if you owe a penalty for underpaying your estimated tax.
Whatever you referred as "paid full tax on my full time job" is not actual tax liability - that is withholding.
The purpose of withholding - to cover possible tax liability.
However the actual tax liability is ONLY calculated on the tax return.
So - when you prepare the tax return - you will add all your income and deductions - and will calculate your tax liability.
After that - you will credit all withheld taxes - and will determine the tax due.
If that amount is less than $1000 - no need to worry about underpayment penalty.
If you owe more than $1000 - you would need to prepare form 2210.
Underpayment penalty rate is 4% and is calculated using the annualized installment method on that form.
If you normally prepare your own return - you perfectly may do that with additional form 2210.
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