1. Capital gains tax reform

One of the crown jewels of Hillary Clinton's tax plan is her call for capital gains tax reforms for the wealthiest Americans -- those who currently find themselves in the 39.6% ordinary income-tax bracket. This includes any individual earning more than $415,050, head of household filers earning more than $441,000, and married joint filers making $466,950 or more, as of 2016.

The current capital gains tax structure is pretty easy to understand. If you sell an investment within 365 days or less, you'll be required to count any capital gains as short-term ordinary income. Investments held for 366 or more days and sold for a gain are treated as long-term capital gains.

Long-term capital gains have just three simplified tax brackets that are based on your ordinary income-tax bracket. If you fall into the 10% or 15% ordinary income bracket, you'll owe 0% in long-term capital gains taxes. If you're in the 25%, 28%, 33%, or 35% brackets, you'll owe 15%. Finally, the highest ordinary income-tax bracket, 39.6%, will owe 20%. Being able to hold an investment for just over a year to pay just 20% in capital gains taxes is a big reason why well-to-do investors have been able to increase their wealth so successfully over time.

Proposed capital gains tax rates on top-bracket investors

TABLE BY AUTHOR. DATA SOURCE: TAX FOUNDATION. "MARGINAL TAX RATE" = CAPITAL GAINS TAX RATE BEFORE NET INVESTMENT INCOME TAX AND SURTAX ON INCOMES OVER $5 MILLION.

Clinton wants to adjust how the wealthiest individuals pay long-term capital gains taxes. As you can see above, Clinton wouldn't allow long-term capital gains to be taxed at 20% unless the individual in question held the investment for at least six years. In fact, no tax concessions are even offered until an asset has been held for two years. As you'll note, these long-term capital gains tax rates don't take into account the 3.8% net investment income tax that individuals making more than $200,000, and joint filers above $250,000, would be responsible for, as well.

On one hand, the move should generate more revenue for the federal government because it's perceived that most long-term investment gains are derived from the wealthy. Then again, the lengthened time frame that investors would have to wait to claim the best tax rate could dissuade investment altogether, which wouldn't be good.

2. Activist investor reforms

Secondly, Clinton has laid out her intentions to seek potential reforms in the way activist investors behave.

Activist investors are investment firms or hedge funds that take a sizable stake in a target company's stock in an effort to sway its management team to make changes. These changes could be to seek a merger or buyout, to boost its shareholder yield via dividends or buybacks, or simply to sell assets and cut spending.

The ultimate goal of doing this is for the investment firm or hedge fund to realize a profit on its investment based on the requested changes. Presumably, Joe and Jane Shareholder also get to come along for the ride. Some of the most well-known activists include Carl Icahn, Bill Ackman of Pershing Square, and Daniel Loeb of Third Point.

IMAGE SOURCE: GETTY IMAGES.

Clinton's contention is that some activist investors are after the quick buck and are engaging in what she referred to as "quarterly capitalism." As you might have inferred by her capital gains tax proposal above, she's attempting to promote a longer-term investing environment, and not one ruled by investment funds that seek a quick pop in the share price of a stock, only to leave Joe and Jane Shareholder hanging.

As noted in The Wall Street Journal last year via data from S&P Global Market Intelligence,S&P 500 companies saw their capital expenditures fall to 29% of operating cash flow in the five years after activist purchases from 42% in the year before those purchases. Meanwhile, share buybacks and dividend payouts increased to 37% of operating cash flow in the first year after a company was approached by activist investors from 22% in the prior year.

The concern here is that cost-cutting and a focus on the short term could impact long-term economic growth. Businesses need to be able to reinvest in themselves, and if CapEx is falling significantly, organic growth could be challenged by activist investors looking just weeks or months into the future.

3. Executive compensation tax reform

Finally, Clinton could have a direct impact on executive compensation if she's elected as president. Clinton, along with other members of her party, has trumpeted income inequality as a prime campaign target during this election, and beginning with executive compensation appears a logical choice.

Executive compensation can take a number of forms, including a salary, perks, common stock, and options. For some executives, being paid in stock or options is commonplace -- and this is where the bulk of their annual pay originates. When a company's management is paid in stock options, its goals are aligned with those of the company's shareholders. Clinton believes, however, that far too many executives are using this type of remuneration, along with short-term stock gains, to take their money off the table.

IMAGE SOURCE: GETTY IMAGES.

Although Clinton hasn't laid out a specific plan to tackle executive compensation, it appears likely that she would aim to change the tax treatment of executive compensation. Based on Clinton's push for wealthier investors to hold their assets longer, it's reasonable to assume that any plans to reform taxation of executive compensation would probably take a similar form.

Furthermore, Clinton wants more transparency from public companies on how executive compensation benefits shareholders. In other words, Clinton wants public companies to explain how higher compensation helps promote better long-term returns.

Anything could happen leading up to the November election, but it's important for investors to understand the possible ramifications of Clinton's proposals. Perhaps in the upcoming debates, we'll be able to add more color to the above commentary.

The $15,834 Social Security bonus you could be missing If you're like most Americans, you're a few years (or more) behind on your retirement savings. But a handful of little-known "Social Security secrets" could help ensure a boost in your retirement income. For example: one easy trick could pay you as much as $15,834 more... each year! Once you learn how to maximize your Social Security benefits, we think you could retire confidently with the peace of mind we're all after. Simply click here to discover how to learn more about these strategies.