What is Schedule K-1?

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Schedule K-1s, which are tax forms used to report a partner’s or shareholder’s income, losses, capital gain, dividends, etc., to the IRS, are sent to more than 40 million U.S. taxpayers each year. 

There are several different types of K-1 forms, which we will discuss later, but the K-1 is designed to make it easier to measure the contributions of a shareholder toward the overall performance of a business. 

K-1s are sometimes confused with Form 1099s, which are tax information documents for individuals who are not employees, like sole proprietors and freelancers. K-1s, however, are quite different and can come with some complexities for tax and accounting firms. 

Let’s take a closer look at K-1s by beginning with the basics.

What is Schedule K-1?

K-1s are tax forms that are used for business partnerships to report to the IRS a partner’s income, losses, capital gain, dividends, etc., from the partnership for the tax year. With the K-1, a partner’s earnings can be taxed at an individual tax rate versus the corporate tax rate.

All pass-through entities, including partnerships, LLCs, and S Corporations must issue K-1s to individual partners and shareholders. The deadline to issue K-1s is March 15th, however, if an extension is filed by the partnership, LLC, or S Corporation, the due date may be extended to September 15th. If September 15th falls on a weekend, the due date is the next business date. When filing their personal tax return to the IRS, individual partners and shareholders will need their K-1 to complete their tax return. Learn more about deadlines and extensions on the IRS website.

There are three different types of K-1 tax forms, which vary depending on the type of business. These are: 

Form 1065 for partnerships: The partnership passes the earnings to the partners who then use the information when filing their individual tax returns to the IRS. 
Form 1120-S for S-corporations: Similar to the 1065, this shows how much each member of the S-corporation earned or lost for the tax year. The IRS looks at the information provided to determine the percent ownership of an individual in an S-corporation. 
Form 1041 for beneficiaries of trusts and estates: This includes the income derived from an estate after the passing of a descendant. 

Is Schedule K-1 considered income?

A Schedule K-1 lists taxable income, similar to a W2 or a Form 1099, but only for the particular types of business entities outlined above. 

As far as K-1 distributions are concerned, they are generally not considered taxable income. 

How does Schedule K-1 affect personal taxes?

In general, a K-1 can affect personal taxes in two ways: either by increasing a partner’s tax liability or by providing them with a tax deduction. 

It will likely increase their total tax liability for the year if the K-1 is associated with an income. 

On the other hand, if the K-1 represents a loss or expenditure (for example, they are investing in a partnership) then it may result in a tax deduction for the partner and reduce their overall tax liability for the year. 

To further illustrate, consider the following example: a partnership records a loss of $40,000 each year for the first two years of operations. In the third year, it makes a profit of $200,000. Therefore, the partnership makes no tax payments on the first two years of losses. For the third year, which is a positive year, the partnership is taxed on $120,000 [$200,000 – ($40,000 x 2)]. The earnings amount is then split between the partners and taxed at their individual income tax brackets. 

If a partnership records a loss over the tax year, partners can state the loss on the K-1 and carry the amount forward until a year of profit for a future tax deduction. Furthermore, consecutive years of net losses can accumulate and be used to apply against future income. 

Is K-1 income subject to self-employment tax?

As outlined by the IRS, limited partners do not pay self-employment tax on their distributive share of partnership income, but they do pay self-employment tax on guaranteed payments. 

General partners, however, are subject to self-employment tax on their distributive shares of income.

W-2s vs. Schedule K-1

Form W-2 is used to report wages paid to employees and the taxes withheld from them. K-1s list taxable income, much like a Form W-2, but partners are not employees and should not be issued a Form W-2. 

Schedule K-2 and K-3

Schedule K-2 and K-3 are schedules that pertain to international tax provisions. 

As explained by the IRS, Form 1065 Schedule K-2 reports items of international tax relevance and is an extension of the Form 1065, Schedule K.

In general, the Form 1065 Schedule K-3 reports a partner’s distributive share of items of international tax relevance and is an extension of the Form 1065 Schedule K-1.   

As of tax years beginning in 2021, pass-through entities with items of international tax relevance must complete the new schedules. 

How to process Schedule K-1s efficiently

As noted earlier, K-1 processing can present several complexities for tax and accounting firms. The reasons why K-1 reporting can be challenging include, but are not limited to: 

There is no standard format for K-1s. They can come in a variety of formats and may include free-form text, footnotes, unstructured data, disclosures, and statements. Practitioners must sift through, extract, and process disparate information in a labor-intensive, manual process that takes time and increases the risk of errors. 

The information disclosed on a K-1 may have state, federal, and international tax implications. 

Tiered partnership structures create additional complexity. 

Therefore, practitioners must leverage intelligent K-1 software that allows them to extract, review, and aggregate complex K-1 information. With the right solution in place, firms can: 

Minimize risk and costly mistakes associated with manual processing work  
Save time and reduce staff costs associated with K-1 data entry 
Process K-1s with more speed and accuracy than ever before 

Additive, now part of Thomson Reuters, helps tax professionals handle complex pass-through reporting with ease. Additive uses AI to extract data from K-1s, K-3s, and related forms, including footnotes, so teams can work faster, smarter, and with greater accuracy.

Whether you review returns in Excel or connect Additive into your existing workflow through its API, the platform is designed to simplify tax preparation and reduce manual work. With built-in 1065 and 8865 validation, scanned document compatibility, and support for complex forms and footnotes, Additive can help firms streamline K-1 processing while maintaining confidence in the output.