Any reduction in the Medicare Part B premium due to enrollment in a Medicare Advantage plan (Part C) which offers a reduction in the Part B premium amount as a benefit (Medicare Advantage Reduction (MARD)).
https://secure.ssa.gov/apps10/poms.nsf/lnx/0601101031
The Centers for Medicare & Medicaid Services (CMS) calculates the Medicare Part B monthly premium amounts and the income-related monthly adjustment amount (IRMAA). CMS publishes the amounts, which can be found in the current Federal Register each year.
https://secure.ssa.gov/apps10/poms.nsf/lnx/0601101031
Make adjustments to estimate your modified adjusted gross income (MAGI). You may have to add or subtract items from your adjusted gross income to estimate your MAGI. Add the following kinds of income, if you have any, to your AGI: 1  Tax-exempt foreign income. 2  Tax-exempt Social Security benefits (including tier 1 railroad retirement benefits).
https://www.healthcare.gov/income-and-household-information/how-to-report/
The Medicare payroll tax is 2.9%. It applies only to earned income, which is wages you are paid by an employer, plus tips. You’re responsible for 1.45% of the tax, and it’s deducted automatically from your paycheck.
https://www.fidelity.com/viewpoints/personal-finance/new-medicare-taxes
Tax. Medicare Tax Calculator is an online tax estimation tool which allows any individuals or self employed persons to calculate how much amount of total medicare tax payment will be paid to United States Government.
http://ncalculators.com/tax/medicare-tax-calculator.htm
The total Medicare Part B premium consists of the following: Standard Medicare Part B premium, plus. Late filing surcharges for Medicare Part B (applied to the standard premium, but not to the IRMAA), plus. IRMAA, minus.
https://secure.ssa.gov/apps10/poms.nsf/lnx/0601101031
There are two ways the Medicare taxes affect upper-income people. First, a 3.8% Medicare surtax is levied on the lesser of net investment income or the excess of modified adjusted gross income (MAGI) above $200,000 for individuals, $250,000 for couples filing jointly, and $125,000 for spouses filing separately.
https://www.fidelity.com/viewpoints/personal-finance/new-medicare-taxes
So, for example, if you are an individual filer whose income is $225,000, you will pay a 1.45% Medicare tax on the first $200,000, then 2.35% (1.45% plus 0.9%) on the next $25,000. Your employer is required to withhold the extra 0.9% once your wages pass the $200,000 threshold for individuals.
https://www.fidelity.com/viewpoints/personal-finance/new-medicare-taxes
The Marketplace does the calculations and tells you what programs and savings you qualify for. Before you apply, you can make a ballpark estimate of your income to see if you may qualify for savings. This page tells you how. Important: The Marketplace application makes the final determination of your eligibility for savings.
https://www.healthcare.gov/income-and-household-information/how-to-report/
Tax on net investment income. In the past, taxpayers weren’t required to pay Medicare tax on income generated from investments such as capital gains, dividends, and taxable interest. Since 2013, however, you could owe a 3.8% Medicare tax on some of or all your net investment income.
https://www.fidelity.com/viewpoints/personal-finance/new-medicare-taxes
how is income calculated for medicare
To calculate an income for Medicare, a 3.8 percent Medicare surtax is levied on the lesser of net investment income or the excess of modified adjusted gross income above $200,000 for individuals, $250,000 for couples filing jointly, and $125,000 for spouses filing separately.