Tax-return season looms, meaning you will soon have to focus on reporting your 2019 income, including compensation from stock plans or gains from stock sales. However, before that, remember your basic tax planning for 2020.
At the start of each year, many key numbers in tax-law provisions are adjusted for inflation. It can be hard to spot those that matter to you. Below are the top three sets of tax figures that highly compensated employees should know: the Social Security income ceiling, your marginal tax rate, and how much you can put into your 401(k) plan.
1. Social Security Wage Base
Social Security tax (6.2%) applies to wages up to a maximum amount per year set annually by the Social Security Administration. Income above that threshold is not subject to Social Security tax (by contrast, Medicare tax is uncapped, with a rate of either 1.45% or 2.35%, depending on your income level). In 2020, the Social Security wage cap is $137,700, up slightly from $132,900 in 2019. This means the maximum possible Social Security withholding in 2020 is $8,537.40. Once your income is over that amount, you'll see 6.2% more in your paycheck or in the income you get from stock compensation, such as an NQSO exercise or RSU vesting.
2. Income-Tax Brackets And Withholding
The table below can help you understand how an additional amount of compensation would be taxed at your marginal tax rate (i.e. the percent of tax you pay for an additional dollar of income in your current tax bracket). This number tells you whether the taxes withheld according to your information on the newly revised Form W-4 will cover the total tax you will owe for 2020. To avoid "penalizing" additional income in your mind, be sure you know your effective or average tax rate.
| RATE | TAXABLE INCOME (SINGLE) | TAXABLE INCOME (JOINT) |
| 10% | $0 to $9,875 | $0 to $19,750 |
| 12% | $9,876 to $40,125 | $19,751 to $80,250 |
| 22% | $40,126 to $85,525 | $80,251 to $171,050 |
| 24% | $85,526 to $163,300 | $171,051 to $326,600 |
| 32% | $163,301 to $207,350 | $326,601 to $414,700 |
| 35% | $207,351 to $518,400 | $414,701 to $622,050 |
| 37% | $518,401 or more | $622,051 or more |
Need To Pay Estimated Taxes?
Additional compensation received, such as a cash bonus or income from a nonqualified stock option exercise or vesting of restricted stock units, is considered supplemental wage income. For federal income-tax withholding, most companies do not use your W-4 rate. Instead, they apply the IRS flat rate of 22% for supplemental income (the rate is 37% for yearly supplemental income in excess of $1 million).
As shown by the table above, once you know your marginal tax-bracket rate, you may find the withholding rate of 22% may not cover all of the taxes that you will owe on supplemental wage income. In that case, you must either put extra money aside for the tax return you file in 2021, pay estimated taxes during 2020, or adjust your W-4 for your salary withholding as soon as possible to cover the shortfall.
3. Qualified Retirement Plans
In 2020, you can elect to defer up to $19,500 from your pay into qualified retirement plans, such as your 401(k). This is a $500 increase over the 2019 limit.
The total ceiling for deferrals to defined contribution retirement plans (including any additional part contributed from your employer) rose to $57,000 in 2020, a $1,000 increase. Both of these limits are $6,500 higher if you are 50 or older. The amount of compensation income that can be considered in the calculation for qualified deferrals is $285,000 in 2020. Check with your company’s 401(k) plan administrator for the process of making changes in your compensation deferral election.
Want to Defer More Income?
Look into whether your company has a nonqualified deferred compensation plan, sometimes called an excess 401(k) plan or other name. For more on these plans, see our sibling website myNQDC.com.
IRS Resources
Here are resources with more details on the many adjusted 2020 tax numbers:
- IRS Rev. Proc. 2019-44 gives inflation adjustments in various income-tax-related provisions.
- IRS Notice 2019-59 and an IRS table give the annual adjustments related to various tax-qualified retirement plans.
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