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That is not an issue - and you may make tax payment ANY time.The IRS will be glad to take your money.What you may so - put in the memo part of your check - your SSN and the year for which you are making a payment.For instance - "SSN***-**-****; 2015"That will indicate how your payment will be credited.
If you are filing a joint tax return - you only need SSN of the primary taxpayer.
But you may list SSN of the spouse as well but that will not make any difference.
You may use a payment voucher and send your payment with that voucher
See last pages here
https://www.irs.gov/pub/irs-pdf/f1040es.pdfFor mailing address - see page 4 - it is based on your state.
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If you still have any doubts, need clarification - please be sure to ask.I am here to help you will all tax related issues.