Yes, this is a marriage issue: each year many couples go through a great deal of stress over paying their taxes. Records are missing, something eats up the time set aside to do the taxes, or something unexpected happens with the numbers. The less time you have left when these problems arise, the more stress they put on each of you, and on your marriage.
Also, if you are a last minute person (I admit I tend to be that way) your bride almost certainly is NOT a last minute person. If this is the case, then bless her by having the taxes done and filed, or ready to drop in the mail, by the first of April.