A quick tutorial:
Assuming you are married filing jointly:
Let’s define a couple of terms:
Your “required annual payment” is the LESSER of the following two numbers:
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If the Adjusted Gross Income shown on your 2012 return is less than or equal to $150,000,
then use your total tax for 2012.
If your Adjusted Gross Income shown on your 2012 return is greater than $150,000, then use your total tax for 2012 multiplied by 1.1.
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90% of your total tax for 2013 as shown on your 2013 return.
Discussion: You can determine the amount in step 1) above just by looking at your 2012 tax return. Determining the amount in step 2) above will obviously take some guessing. For this reason, unless you think your 2013 tax will be substantially lower than your 2012 tax, most people just use step 1.
Next: Your “required quarterly payment” is 25% of the “required annual payment” as defined above.
To avoid a penalty for underpayment of estimated taxes, you have to pay at least your “required quarterly payment” each quarter.
Now, if either one (or both) of you have income tax withheld from your paycheck (or from some other payment). You can count 25% of your total withholding for 2013 against your “required quarterly payment” each quarter. And if that’s not enough to cover your “required quarterly payment,” then just pay the difference.
Let me give you an example:
Let’s say your total joint 2012 tax was $2000 and your 2012 AGI was under $150,000.
You estimate your joint 2013 tax to be $2,000,000.
The lesser of $2000 and $1,800,000 is $2000. So your required annual payment is $2000. Your required quarterly payment is $500.
You have a job and you expect $400 to be withheld from your pay in 2013.
So the amount you have to pay each quarter is $500 minus $100 or $400.
Exceptions:
If your 2013 tax minus your 2013 withholding turns out to be less than $1000, you will not have to pay any penalties.
You may optionally elect to calculate your required quarterly payment by filing Form 2210 and using the Annualized Installment (AI) method. The AI method requires you to calculate your deductions and income each quarter and then to annualize the result in order to determine how much to pay each quarter. The advantage of the AI method is that there is no guesswork involved. You calculate your taxes each quarter and send them in. The disadvantage is that it takes a lot of work and detailed records. But it can save you money if you have an unexpected inrush of taxable income towards the end of the year.
Also note that the so-called quarters are not really 1/4 of the year. The “quarters” range in length from 2 to 4 months.
What if you screw up and underpay? You only pay a penalty on the amount you missed your required quarterly payment by. If your required quarterly payment turns out to be $500 and you pay $499, you will only pay a penalty on $1.
The penalty rate is a variable rate that changes each quarter. The current annual rate is 3%. And it is only charged for the number of days you are late. So you will actually pay much less than 3% of the late amount.
1. Am I required to pay quarterly taxes, or is it just a good idea?
You are not required to pay, but if you don’t meet the minimum required installment each quarter, you will be charged a penalty as described above.
2. How do I estimate the amount to pay? Do people just pay the SS and Medicare portion, or income tax as well?
Calculate your required quarterly installment as described above. Give yourself credit for withholding as described above and then send in the difference. When doing your calculations, include all taxes shown on your tax returns, including SS and Medicare taxes if they are shown on the return.
3. Will the IRS send me a receipt when they get the money, or any kind of statement at the end of the year?
No.
4. Can I pay them electronically? Is there a program like TurboTax or something that will help me estimate the amount and fill out the forms?
Go to https://eftps.gov and sign up for EFTPS (Electronic Federal Tax Payment System). That is the IRS’s electronic payment system for all your taxes. You can pay from any checking account at any US bank. It takes a couple of weeks to get registered since they have to send you a PIN number via US Mail. EFTPS is free.
Or if you have a Mastercard or Visa that pays at least 1.89% in rewards, pay your taxes at payUSAtax.com. payUSAtax charges a 1.89% service fee for MC and Visa payment.
There’s really no form you have to fill out for your estimated tax payments. If you pay electronically, you don’t have to submit a form. If you pay by mail, you submit a voucher with your name, address, SS number, and the amount you are paying written on it. (There is a worksheet attached to the voucher to assist you in estimating your 2013 tax, but you do not submit that to the IRS.)
Turbotax can assist you. It will take your 2012 tax, divide by 4, and tell you to send that amount in each quarter. Really.
This guy sells a calculator. He calls it an Annualized Installment calculator, but it will calculate your estimated payments using every method to find the lowest payment.