I order a Publication 17 from IRS every year. It goes into plain language detail about every aspect of your 1040. If there is more information to be had, it tells you the number of the particular booklet to order, for example, if you sold a house for your parents and are unsure if all or part of the gain is tax-free, e.g. your parents went into a rest home: is that counted toward the two year requirement.
In January I start using a very simple program I devised in Lotus (I like Lotus!) that adds up all my income, deductions, and credits and calculates my taxes for that year. As deductions come along, for example medical and dental expenses, I just put them in and it recalculates. I use this to keep my withholding at the correct amount so I won’t owe or have to pay anything when I file.
You change your withholding with a W-4. You can claim so many dependency exemptions and in conjunction with your filing status the withholding is taken from a table; or, you can just designate a dollar amount. That’s the best. I believe in having as much of my own money as I can, now.
There are no magic, mysterious deductions; but, there are unknown deductions. For example, if you drive from home to a temporary job location and have no permanent job location, but travel from there to another temporary job location, and not sent away on a long-term job assignment (over a year), you can deduct the miles from your house (tax home) to your various job locations. You can also take a meal allowance if you are away overnight.
Also, seminars, including plane fare and hotel, fees are deductible if job-related.
And the Lifetime Learning Credit can be taken anytime you take a class; and it’s credited directly against your tax. If you have a child in college, you can take the Hope Credit for the first two years and it’s a big one.
You can deduct medical/dental expenses you paid for anyone who is your dependent, and your child who does not live with you and is not your dependent or anyone you help to support under a multiple support agreement. Health insurance premiums are so high these days that they have become one of the larger deductions. From the total, 7.5% of your AGI is subtacted.
Self-employed people can deduct almost everything related to their business, but employees are the ones who miss deductions related to their work.
I use TurboTax and it’s great. But, you really do need to know a little about what’s deductible. You can click on informative notes in the program. If you take your time the first year and use the program to its utmost and also the Pub. 17, in subsequent years all you will have to do is review the changes for the year, which are in front pages of the Pub. 17.