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All filing status's except MFS
AMT taxable income between $0 and $179,500 = 26%
AMT taxable income greater than $179,500 = 28%
filing status of MFS:
AMT taxable income between $0 and $89,750 = 26%
AMT taxable income greater than $87,500 = 28%

Individuals can base their payments on:
90% of the current years tax or
100% of the prior years tax or
110% of the prior years tax if the prior year's AGI is more than $150,000 ($75,000 if filing Married filing Separately)
Note that there is no penalty for not paying federal estimates if the current year's tax is less than $1,000 or there was no tax liability in the precedding year.

For 2013:
The Tax between 0 and 8,925 = 10%,
between $8,925 and $36,250 the Tax = 870 plus 15% over 8,925,
between $36,250 and $87,850 the Tax = 4,868 plus 25% over 36,250,
between $87,850 and $183,250 the Tax = 17,443 plus 28% over 87,850,
between $183,250, and $398,350 the Tax = 43,843 plus 33% over 183,250,
between $398,350, and $400,000 the Tax = 43,843 plus 33% over 398,350 over $400,000 the Tax = 116,163.75 plus 39.6% over 400,000.
For 2012:
The Tax between 0 and 8,700 = 10%,
between $8,701 and $35,350 the Tax = 870 plus 15% over 8,700,
between $35,351 and $85,650 the Tax = 4,868 plus 25% over 35,350,
between $85,651 and $178,650 the Tax = 17,443 plus 28% over 85,650,
between $178,651, and $388,350 the Tax = 43,843 plus 33% over 178,650,
over $388,351 the Tax = 112,863 plus 35% over 388,350.

Yes. Annulment decree payments qualify as deductible alimony payments. They also would be considered taxable income to the recipient. They should be reported as alimony (adjustment or income) on IRS Form 1040 page 1.

Generally, the wording in the divorce or separation decree identifies the payments as Alimony or something other than Alimony, such as child support. Alimony is income to the recipient and an adjustment to income for the payer. Generally, for payments to be considered alimony, seven characteristics should be present. The payments are in cash or check. The payment must be paid under a divorce decree or separation instrument. The divorce decree or separation agreement cannot designate the payment as a payment which is not deductible by the payer or includable in gross income by the recipient. The recipient and the payer must not be members of the same household. The payments must not be treated as child support. The taxpayer and spouse may not file a joint return with each other. There must not be a liability to make any payment for any period after the death of the spouse.

If you live in the same house as your ex-spouse and are legally separated or divorced, you cannot deduct your alimony payments, nor is your ex-wife required to report the alimony as income.

Yes. By mutual agreement one spouse can forego the deduction for alimony and the other spouse can receive the benefit of not being required to pay taxes on the alimony received.

No. There is no minimum payment period. Recapture of alimony amounts may apply where payments decrease by more than $15,000 within the first three years of the divorce.

The deductible alimony payments made in the first year or second year may have to be recaptured as income in the third year where the alimony payments within the first 3 years decrease by more than $15,000. Payments made in the second after the separation year are recaptured if the payments exceed the payments in the third post separation year by more than $15,000. Payments made in the first after the separation year are recaptured as income if they exceed the "average" payments made in the second post separation year and the third post separation year by more than $15,000. The recaptured amount is reported on IRS Form 1040 on the line Alimony received with a notation Alimony recapture with the payee spouse’s social security number.

When both alimony and child support are made together in a monthly payment, it is presumed that child support is paid first.
If your husband did not pay the full amount in a month or many months, then you need to pick up as income the difference over the child support amount for that month as alimony and income on your tax return.
It is reported on IRS Form 1040, page 1.