The hydrogenosome is a crucial organelle for some organisms that inhabit oxygen-poor environments, protists such as some free-living ciliates, unicellular parasites, termite flagellates and rumen fungi and rumen ciliates (Figs. 22.3 and 22.7). These organisms lack conventional mitochondria (Figs. 22.1 and 22.2).
1 Percentage Method. 2  The percentage method taxes a bonus at a flat rate, normally 25%. 3  If the bonus is in excess of $1 million, it is taxed at a rate of 39.6%. 4  This means that if your bonus is $10,000, and you are taxed using the percentage method, $2,500 goes to the IRS.
Social Security is financed by a 12.4 percent tax on wages up to the annual threshold, with half (6.2 percent) paid by workers and the other half paid by employers. This taxable wage base usually goes up each yearâit rose from $117,000 in 2014 to $118,500 in 2015.