Tax deductions can be a confusing topic considering the many types of tax deductions and the terminology for them. Below I explain the different types of tax deductions you can claim on your tax return. You may be taking several of these types without even knowing it.

Types of Individual Tax Deductions

Exclusions

Many things we think of tax deductions are not treated as tax deductions on a tax return. Instead, they are excluded from taxable income. An exclusion from taxable income has the exact same effect as a tax deduction.

The most common exclusion is the exclusion for employer provided benefits, including health insurance, retirement plan contributions, and health savings accounts contributions. Here is an example:

Example: Mark has a salary of $100,000. He contributes ten percent ($10,000) of his salary to his employer’s 401(k) plan. His W-2 for the year will report wages of $90,000, not $100,000, and he will enter $90,000 as wages on his Form 1040. The $10,000 Mark contributed to his 401(k) is excluded from his gross income. This exclusion has the same income tax effect as a deduction.

Exclusions are a great form of deduction in that they are generally unlimited on your tax return, though they may have their own limitations. For example, in 2021 the most an employee under age 50 can exclude for contributions to a 401(k), 403(b), or a 457 is $19,500.

For those at least 70 1/2 years old, the qualified charitable distribution (“QCD”), which I wrote about here, can be a great tax planning technique. 

Exclusions also reduce adjusted gross income (“AGI”). Items that reduce AGI are great because AGI (or modified AGI, “MAGI”) is usually the measuring stick for whether a taxpayer qualifies for many tax benefits (such as eligibility for making a deductible contribution to an IRA or making a contribution to a Roth IRA). Lowering AGI is an important tax planning objective, since lower AGI opens the door to several tax benefits. 

Business Deductions

Business deductions include trade or business deductions generated from self-employment and investments in partnerships and rental property. On a Form 1040, these deductions are reported on Schedule C or Schedule E. Business deductions include salaries, rent, depreciation (deducting the cost of a business asset over a useful life), and other ordinary and necessary expenses.

Business deductions are generally great tax deductions because they are subject to relatively few limitations on your tax return. That said, limitations such as the passive activity loss rules and the at-risk limitations can limit a taxpayer’s ability to claim some business losses. Further, business deductions reduce not only income tax but also self-employment income, and thus, self-employment tax.

Business deductions are also valuable because they reduce AGI.

“For AGI” or “Above the Line” Deductions

On your Form 1040 you deduct certain expenses from your gross income to determine your AGI. Prior to tax returns filed for 2018 and later, these deductions were at the bottom of page 1 of the Form 1040. Starting with tax returns for 2018, these deductions are presented on Schedule 1 which accompanies Form 1040.

Examples of these deductions include one-half of self-employment tax paid by self-employed individuals, deductible contributions to IRAs, and contributions to certain self-employed retirement plans.  

Capital losses, generally up to $3,000 on any one tax return, can be deducted for computing AGI. Capital losses in excess of $3,000 are carried over to future tax years to be deducted against capital gains and against up to $3,000 per year of ordinary income. 

Health Savings Accounts (“HSAs”) are their own special breed. If contributions to an HSA are made through workplace payroll withholding, they are excluded from taxable income. If contributions to an HSA are made through another means (such as a check or wire transfer to the HSA), the contributions are for AGI deductions reported on Schedule 1. Which is better? From an income tax perspective, there is no difference. But from a payroll tax perspective, using payroll withholding is the clear winner. Amounts contributed to an HSA through payroll withholding are not subject to the FICA tax, creating another HSA tax win!

Standard Deduction or Itemized Deductions

Tax reform changed the landscape of itemized deductions. As a result of the tax reform bill enacted in December 2017, far fewer taxpayers will claim itemized deductions, and will instead claim the standard deduction.

The most common itemized deductions are state and local taxes (income, property, and in some cases, sales taxes), charitable contributions, and mortgage interest.

Taxpayers generally itemize if the sum total of itemized deductions (reported on Schedule A) exceed the standard deduction. Tax reform did two things to increase the chance that the standard deduction will exceed a taxpayer’s itemized deductions. First, the amount of the standard deduction increased. It went from $6,350 for single taxpayers in 2017 to $12,000 for single taxpayers in 2018. For married filing joint taxpayers, the standard deduction went from $12,700 in 2017 to $24,000 in 2018.

The standard deduction for 2021 is $12,550 (single) and $25,100 (MFJ) for most taxpayers. 

In addition, several itemized deductions were significantly reduced. For example, starting in 2018 there is a deduction cap of $10,000 per tax return ($5,000 for married filing separate tax returns) for state and local taxes. This hits married taxpayers particularly hard and increases the chance that if you are married filing joint you will claim the standard deduction, since you will need over $15,100 in other itemized deductions to itemize (using the 2021 numbers).

In addition, miscellaneous deductions, such as unreimbursed employee expenses and tax return preparation fees, were eliminated as part of tax reform.

Thus, many taxpayers will find that they will often claim the standard deduction. As discussed below, there will be planning opportunities for taxpayers to essentially push many itemized deductions (such as charitable contributions) into one particular tax year, itemize for that year, and then claim the standard deduction for the next several years.

Neither the standard deduction nor itemized deductions reduce AGI.

Special Deductions

In a relatively new development in tax law, there are now deductions that apply only after AGI has been determined and separate and apart from the standard deduction or itemized deductions. 

QBI Deduction

Tax reform created an entirely new tax deduction: the qualified business income deduction (also known as the QBI deduction or the Section 199A deduction). I have written about the QBI deduction here and here. Subject to certain limitations, taxpayers can claim, as a deduction, 20 percent of qualified business income, which is generally income from domestic business activities (not wage income), income from publicly-traded partnerships, and qualified REIT (real estate investment trust) dividends.

The QBI deduction does not reduce AGI.

Taxpayers can claim the QBI deduction regardless of whether they elect itemized deductions or the standard deduction.

Special Deduction for Charitable Contributions

For the 2021 tax year, taxpayers who do not claim itemized deductions are eligible for a special deduction for charitable contributions. The deduction is limited to $300 for single filers and $600 for MFJ filers.

As discussed by Jeffrey Levine, this deduction, like the QBI deduction, neither reduces AGI nor is an itemized deduction. 

The statutory language for this new deduction is found at Section 170(p). I believe that there is a very good chance that this deduction is extended to years beyond 2021, though as of now, it is only applicable to the 2021 tax year. 

Planning

Tax deductions provide a great opportunity for impactful tax planning. Here are some examples.

Timing

If your marginal income tax rate is the same every year, then you generally want to accelerate deductions. Thus, if you have a sole proprietorship and are a cash basis taxpayer, you are generally better off paying rent due on January 1, 2022 on December 31, 2021 instead of January 1, 2022 since the deduction saves the same amount of tax regardless of which tax year you pay it, but you’ll get the cash tax benefit sooner – on your 2021 income tax return instead of on your 2022 income tax return.

But there can be situations where you anticipate that your marginal tax rate will be greater next year than this year. In those cases, it makes sense to delay deductions. For example, perhaps you would make a large charitable contribution next year instead of before the end of the current year. Or, in the above example, you would pay the rent on January 1, 2022 to ensure the deduction is in 2022 instead of 2021.

Bunching

For some taxpayers, it may make sense to bunch deductions to maximize the total benefit of itemizing deductions versus claiming the standard deduction over several years. My favorite example of this is the donor advised fund. I’m not alone in my fondness of the donor advised fund. It allows you to contribute to a fund in one year, claim a charitable deduction for the entire amount of the contribution, and then donate from that fund to charities in subsequent years. The big advantage is that you get an enhanced upfront deduction in the first year and then claim the standard deduction in several subsequent years. This strategy only works if the amount of the deduction for the contribution to the donor advised fund is sufficient such that your itemized deductions in the year of the contribution exceed the standard deduction by a healthy amount.

Deadlines, Deadlines, Deadlines!!!

Different deductions have different deadlines. Many deductions have December 31st deadlines, so it is important to make the contribution by year-end. For charitable contributions, it is best to make the contribution online with a credit or debit card before January 1st if you are running really late, though if you place the contribution in a U.S. Postal Service mailbox prior to January 1st that counts as prior to the near year (though it makes it harder to prove you beat the deadline if you drop it in the mailbox on December 31st).

For employee contributions to a 401(k), the deadline is December 31st. Thus, if you are reading this on December 5th and you want to significantly increase your 401(k) contribution for 2021, you ought to get in touch with your payroll administrator and increase your contribution rate for your last paycheck ASAP.

By contrast, the deadline for a 2021 contribution to a deductible IRA or a non-payroll 2021 contribution to a HSA is April 15, 2022 (the date tax returns are due).

Self-employed retirement plans have their own sets of deadlines that should be considered.

Conclusion

Tax deductions present several important tax planning considerations. These considerations should include the taxpayer’s current marginal tax rate and future marginal tax rate. They should also include consideration of maximizing the combination of itemized deductions and the standard deduction over multiple taxable years.

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This post is for entertainment and educational purposes only. It does not constitute accounting, financial, investment, legal, or tax advice. Please consult with your advisor(s) regarding your personal accounting, financial, investment, legal, and tax matters. Please also refer to the Disclaimer & Warning section found here.